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* f2fs: obsolete ALLOC_NID_LIST listChao Yu2017-12-065-73/+64
| | | | | | | | | | As Fan Li reported, there is no user traversing nid_list[ALLOC_NID_LIST] which is used for tracking preallocated nids. Let's drop it, and only track preallocated nids in free_nid_root radix-tree. Reported-by: Fan Li <fanofcode.li@samsung.com> Signed-off-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
* f2fs: convert inline data for direct I/O & FI_NO_PREALLOCWeichao Guo2017-12-061-5/+8
| | | | | | | | | | | In FI_NO_PREALLOC cases, direct I/O path may allocate blocks for an inode but keep its inline data flag. This inconsistency may trigger vfs clear_inode nrpages bug_on when evicting the inode. We should convert inline data first in this case. Signed-off-by: Weichao Guo <guoweichao@huawei.com> Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
* f2fs: allow readpages with NULL file pointerHsiang Kao2017-12-061-1/+1
| | | | | | | | | | | Keep in line with the other Linux file system implementations since page_cache_sync_readahead supports NULL file pointer, and thus we can readahead data by f2fs itself without file opening (something like the btrfs behavior). Signed-off-by: Gao Xiang <gaoxiang25@huawei.com> Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
* f2fs: show flush list status in sysfsChao Yu2017-12-062-2/+6
| | | | | | | This patch adds to show flush list status in sysfs. Signed-off-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
* f2fs: introduce read_xattr_blockChao Yu2017-12-061-26/+24
| | | | | | | | | | Commit ba38c27eb93e ("f2fs: enhance lookup xattr") introduces lookup_all_xattrs duplicating from read_all_xattrs, which leaves lots of similar codes in between them, so introduce new help read_xattr_block to clean up redundant codes. Signed-off-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
* f2fs: introduce read_inline_xattrChao Yu2017-12-061-30/+29
| | | | | | | | | | Commit ba38c27eb93e ("f2fs: enhance lookup xattr") introduces lookup_all_xattrs duplicating from read_all_xattrs, which leaves lots of similar codes in between them, so introduce new help read_inline_xattr to clean up redundant codes. Signed-off-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
* Revert "f2fs: reuse nids more aggressively"Chao Yu2017-12-061-4/+0
| | | | | | | | | | | | | | | | | | Commit 268344664603 ("f2fs: reuse nids more aggressively") tries to reuse nids as many as possilbe, in order to mitigate producing obsolete node pages in page cache. But acutally, before we reuse the nids and related node page cache, we will always invalidate that node page, so there will be not any obsolete node pages in cache. Let's just revert previous commit, so that nm_i::next_scan_nid can be increased ascendingly, making __build_free_nids traverses all NAT pages more easily, finally, free nid bitmap cache can be enabled as soon as possible. Signed-off-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
* Revert "f2fs: node segment is prior to data segment selected victim"Yunlong Song2017-12-061-11/+1
| | | | | | | | | | | | | | | | | | | | | This reverts commit b9cd20619e359d199b755543474c3d853c8e3415. That patch causes much fewer node segments (which can be used for SSR) than before, and in the corner case (e.g. create and delete *.txt files in one same directory, there will be very few node segments but many data segments), if the reserved free segments are all used up during gc, then the write_checkpoint can still flush dentry pages to data ssr segments, but will probably fail to flush node pages to node ssr segments, since there are not enough node ssr segments left (the left ones are all full). So revert this patch to give a fair chance to let node segments remain for SSR, which provides more robustness for corner cases. Conflicts: fs/f2fs/gc.c Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
* include: asm-generic: do not hard code HZ to 100Evisceration2017-12-061-1/+1
| | | | | | | Use the defconfig value instead Change-Id: I529d08cf06d64f1e3976c0cd876f40b7efefa222 Signed-off-by: Alexander Martinz <eviscerationls@gmail.com>
* clocksource: Fix abs() usage w/ 64bit valuesJohn Stultz2017-12-061-1/+1
| | | | | | | | | | | | | | | | | | | | commit 67dfae0cd72fec5cd158b6e5fb1647b7dbe0834c upstream. This patch fixes one cases where abs() was being used with 64-bit nanosecond values, where the result may be capped at 32-bits. This potentially could cause watchdog false negatives on 32-bit systems, so this patch addresses the issue by using abs64(). Change-Id: I0fea076d3af13221cd43082eb94de4bdcf013275 Signed-off-by: John Stultz <john.stultz@linaro.org> Cc: Prarit Bhargava <prarit@redhat.com> Cc: Richard Cochran <richardcochran@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Link: http://lkml.kernel.org/r/1442279124-7309-2-git-send-email-john.stultz@linaro.org Signed-off-by: Thomas Gleixner <tglx@linutronix.de> [lizf: Backported to 3.4: adjust context] Signed-off-by: Zefan Li <lizefan@huawei.com>
* sched/cputime: Fix invalid gtime in procHiroshi Shimamoto2017-12-061-0/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | /proc/stats shows invalid gtime when the thread is running in guest. When vtime accounting is not enabled, we cannot get a valid delta. The delta is calculated with now - tsk->vtime_snap, but tsk->vtime_snap is only updated when vtime accounting is runtime enabled. This patch makes task_gtime() just return gtime without computing the buggy non-existing tickless delta when vtime accounting is not enabled. Use context_tracking_is_enabled() to check if vtime is accounting on some cpu, in which case only we need to check the tickless delta. This way we fix the gtime value regression on machines not running nohz full. The kernel config contains CONFIG_VIRT_CPU_ACCOUNTING_GEN=y and CONFIG_NO_HZ_FULL_ALL=n and boot without nohz_full. I ran and stop a busy loop in VM and see the gtime in host. Dump the 43rd field which shows the gtime in every second: # while :; do awk '{print $3" "$43}' /proc/3955/task/4014/stat; sleep 1; done S 4348 R 7064566 R 7064766 R 7064967 R 7065168 S 4759 S 4759 During running busy loop, it returns large value. After applying this patch, we can see right gtime. # while :; do awk '{print $3" "$43}' /proc/10913/task/10956/stat; sleep 1; done S 5338 R 5365 R 5465 R 5566 R 5666 S 5726 S 5726 Signed-off-by: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Chris Metcalf <cmetcalf@ezchip.com> Cc: Christoph Lameter <cl@linux.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Luiz Capitulino <lcapitulino@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul E . McKenney <paulmck@linux.vnet.ibm.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1447948054-28668-2-git-send-email-fweisbec@gmail.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
* arm64: Remove nr parameter from secure_computingbillchen1977@gmail.com2017-12-051-1/+1
| | | | Change-Id: I2afff0e5ea7fe12843ef2e48a5d7eba3216fd8ce
* seccomp,x86,arm,mips,s390: Remove nr parameter from secure_computingAndy Lutomirski2017-12-056-33/+65
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The secure_computing function took a syscall number parameter, but it only paid any attention to that parameter if seccomp mode 1 was enabled. Rather than coming up with a kludge to get the parameter to work in mode 2, just remove the parameter. To avoid churn in arches that don't have seccomp filters (and may not even support syscall_get_nr right now), this leaves the parameter in secure_computing_strict, which is now a real function. For ARM, this is a bit ugly due to the fact that ARM conditionally supports seccomp filters. Fixing that would probably only be a couple of lines of code, but it should be coordinated with the audit maintainers. This will be a slight slowdown on some arches. The right fix is to pass in all of seccomp_data instead of trying to make just the syscall nr part be fast. This is a prerequisite for making two-phase seccomp work cleanly. Cc: Russell King <linux@arm.linux.org.uk> Cc: linux-arm-kernel@lists.infradead.org Cc: Ralf Baechle <ralf@linux-mips.org> Cc: linux-mips@linux-mips.org Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: linux-s390@vger.kernel.org Cc: x86@kernel.org Cc: Kees Cook <keescook@chromium.org> Signed-off-by: Andy Lutomirski <luto@amacapital.net> Signed-off-by: Kees Cook <keescook@chromium.org>
* arm64/ptrace: Preserve previous registers for short regset writeDave Martin2017-12-051-1/+2
| | | | | | | | | | | | Ensure that if userspace supplies insufficient data to PTRACE_SETREGSET to fill all the registers, the thread's old registers are preserved. Cc: <stable@vger.kernel.org> # 3.19.x- Fixes: 766a85d7bc5d ("arm64: ptrace: add NT_ARM_SYSTEM_CALL regset") Signed-off-by: Dave Martin <Dave.Martin@arm.com> Acked-by: Will Deacon <Will.Deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
* format-security: move static strings to constKees Cook2017-12-0516-24/+28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | While examining output from trial builds with -Wformat-security enabled, many strings were found that should be defined as "const", or as a char array instead of char pointer. This makes some static analysis easier, by producing fewer false positives. As these are all trivial changes, it seemed best to put them all in a single patch rather than chopping them up per maintainer. Link: http://lkml.kernel.org/r/20170405214711.GA5711@beast Signed-off-by: Kees Cook <keescook@chromium.org> Acked-by: Jes Sorensen <jes@trained-monkey.org> [runner.c] Cc: Tony Lindgren <tony@atomide.com> Cc: Russell King <linux@armlinux.org.uk> Cc: "Maciej W. Rozycki" <macro@linux-mips.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> Cc: Viresh Kumar <viresh.kumar@linaro.org> Cc: Daniel Vetter <daniel.vetter@intel.com> Cc: Jani Nikula <jani.nikula@linux.intel.com> Cc: Sean Paul <seanpaul@chromium.org> Cc: David Airlie <airlied@linux.ie> Cc: Yisen Zhuang <yisen.zhuang@huawei.com> Cc: Salil Mehta <salil.mehta@huawei.com> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Jiri Slaby <jslaby@suse.com> Cc: Patrice Chotard <patrice.chotard@st.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: James Hogan <james.hogan@imgtec.com> Cc: Paul Burton <paul.burton@imgtec.com> Cc: Matt Redfearn <matt.redfearn@imgtec.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk> Cc: Mugunthan V N <mugunthanvnm@ti.com> Cc: Felipe Balbi <felipe.balbi@linux.intel.com> Cc: Jarod Wilson <jarod@redhat.com> Cc: Florian Westphal <fw@strlen.de> Cc: Antonio Quartulli <a@unstable.cc> Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com> Cc: Kejian Yan <yankejian@huawei.com> Cc: Daode Huang <huangdaode@hisilicon.com> Cc: Qianqian Xie <xieqianqian@huawei.com> Cc: Philippe Reynes <tremyfr@gmail.com> Cc: Colin Ian King <colin.king@canonical.com> Cc: Eric Dumazet <edumazet@google.com> Cc: Christian Gromm <christian.gromm@microchip.com> Cc: Andrey Shvetsov <andrey.shvetsov@k2l.de> Cc: Jason Litzinger <jlitzingerdev@gmail.com> Cc: WANG Cong <xiyou.wangcong@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
* sched/idle: Move cpu/idle.c to sched/idle.cNicolas Pitre2017-12-054-2/+1
| | | | | | | | | | | | | | | Integration of cpuidle with the scheduler requires that the idle loop be closely integrated with the scheduler proper. Moving cpu/idle.c into the sched directory will allow for a smoother integration, and eliminate a subdirectory which contained only one source file. Signed-off-by: Nicolas Pitre <nico@linaro.org> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/alpine.LFD.2.11.1401301102210.1652@knanqh.ubzr Signed-off-by: Ingo Molnar <mingo@kernel.org>
* PM: convert do_each_thread to for_each_process_threadMichal Hocko2017-12-051-8/+8
| | | | | | | | | | | | as per 0c740d0afc3b (introduce for_each_thread() to replace the buggy while_each_thread()) get rid of do_each_thread { } while_each_thread() construct and replace it by a more error prone for_each_thread. This patch doesn't introduce any user visible change. Suggested-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Michal Hocko <mhocko@suse.cz> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
* perf: Optimize group_sched_in()Peter Zijlstra2017-12-051-1/+1
| | | | | | | | | | | | | | | | Use the ctx pmu instead of the event pmu. When a group leader is a software event but the group contains hardware events, the entire group is on the hardware PMU. Using the hardware PMU for the transaction makes most sense since that's the most expensive one to programm (and software PMUs generally don't have TXN support anyway). Signed-off-by: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/n/tip-sctoo9t2f3nn2c9g568928q3@git.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* tcp: fix a compile error in DBGUNDO()Eric Dumazet2017-12-051-2/+1
| | | | | | | | | If DBGUNDO() is enabled (FASTRETRANS_DEBUG > 1), a compile error will happen, since inet6_sk(sk)->daddr became sk->sk_v6_daddr Fixes: efe4208f47f9 ("ipv6: make lookups simpler and faster") Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* workqueue: allow work_on_cpu() to be called recursivelyLai Jiangshan2017-12-051-10/+22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If the @fn call work_on_cpu() again, the lockdep will complain: > [ INFO: possible recursive locking detected ] > 3.11.0-rc1-lockdep-fix-a #6 Not tainted > --------------------------------------------- > kworker/0:1/142 is trying to acquire lock: > ((&wfc.work)){+.+.+.}, at: [<ffffffff81077100>] flush_work+0x0/0xb0 > > but task is already holding lock: > ((&wfc.work)){+.+.+.}, at: [<ffffffff81075dd9>] process_one_work+0x169/0x610 > > other info that might help us debug this: > Possible unsafe locking scenario: > > CPU0 > ---- > lock((&wfc.work)); > lock((&wfc.work)); > > *** DEADLOCK *** It is false-positive lockdep report. In this sutiation, the two "wfc"s of the two work_on_cpu() are different, they are both on stack. flush_work() can't be deadlock. To fix this, we need to avoid the lockdep checking in this case, thus we instroduce a internal __flush_work() which skip the lockdep. tj: Minor comment adjustment. Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Reported-by: "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com> Reported-by: Alexander Duyck <alexander.h.duyck@intel.com> Signed-off-by: Tejun Heo <tj@kernel.org>
* workqueue: Remove deprecated flush[_delayed]_work_sync()Jingoo Han2017-12-051-12/+0
| | | | | | | | | | flush[_delayed]_work_sync() were deprecated by 4382973 ("workqueue: deprecate flush[_delayed]_work_sync()") and have been deprecated for a long time. In addition, these are not used anymore. So, let's remove these functions. Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Tejun Heo <tj@kernel.org>
* workqueue: Spelling s/instensive/intensive/Geert Uytterhoeven2017-12-051-1/+1
| | | | | Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Tejun Heo <tj@kernel.org>
* workqueue: Remove deprecated __cancel_delayed_work()Tan Xiaojun2017-12-051-15/+0
| | | | | | | | | | | | __cancel_delayed_work() was deprecated by 136b5721d75a ("workqueue: deprecate __cancel_delayed_work()") as cancel_delayed_work() was updated so that it could be used from all contexts. Enough time has passed since the deprecation. Let's remove it. tj: description update Signed-off-by: Tan Xiaojun <tanxiaojun@huawei.com> Signed-off-by: Tejun Heo <tj@kernel.org>
* workqueue.h: remove loops of single statement macrosValentin Rothberg2017-12-051-6/+2
| | | | | | | | | | checkpatch.pl complained about two single statement macros in do while (0) loops. The loops and the trailing semicolons are now removed, which makes checkpatch happy and the two macros consistent with the rest of the file. Signed-off-by: Valentin Rothberg <valentinrothberg@gmail.com> Signed-off-by: Tejun Heo <tj@kernel.org>
* workqueue: remove unused WORK_CPU_ENDLai Jiangshan2017-12-051-2/+1
| | | | | | | | | | | | | | | WORK_CPU_END is totally unused since 4e8b22bd1a37 ("workqueue: fix pool ID allocation leakage and remove BUILD_BUG_ON() in init_workqueues"). It should be removed. After it is removed, the comment "special cpu IDs" is not precise due to there is only one special CPU ID (WORK_CPU_UNBOUND) left, so we also change this comment to the description for WORK_CPU_UNBOUND. tj: Minor description and comment tweaks. Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Tejun Heo <tj@kernel.org>
* workqueue: move flush_scheduled_work() to workqueue.hLai Jiangshan2017-12-052-31/+29
| | | | | | | flush_scheduled_work() is just a simple call to flush_work(). Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Tejun Heo <tj@kernel.org>
* workqueue: remove unused work_clear_pending()Lai Jiangshan2017-12-051-7/+0
| | | | | | | | | | | | In 8930caba3dbd ("workqueue: disable irq while manipulating PENDING"), setting last CPU and clearing PENDING got merged into a single operation (set_work_cpu_and_clear_pending()), which resulted that the internal routine work_clear_pending() is not used any more. tj: Minor description tweak. Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Tejun Heo <tj@kernel.org>
* kernel/workqueue.c: pr_warning/pr_warn & printk/pr_infoFabian Frederick2017-12-051-3/+3
| | | | | | | | tj: Refreshed on top of wq/for-3.16. Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Fabian Frederick <fabf@skynet.be> Signed-off-by: Tejun Heo <tj@kernel.org>
* workqueue: simplify wq_update_unbound_numa() by jumping to use_dfl_pwq if ↵Daeseok Youn2017-12-051-6/+2
| | | | | | | | | | | | | | the target cpumask equals wq's wq_update_unbound_numa(), when it's decided that the newly updated cpumask equals the default, looks at whether the current pwq is already the default one and skips setting pwq to the default one. This extra step is unnecessary and we can always jump to use_dfl_pwq instead. Simplify the code by removing the conditional. This doesn't make any functional difference. Signed-off-by: Daeseok Youn <daeseok.youn@gmail.com> Signed-off-by: Tejun Heo <tj@kernel.org>
* workqueue: wake regular worker if need_more_worker() when rescuer leave the poolLai Jiangshan2017-12-051-2/+2
| | | | | | | | | | | | We don't need to wake up regular worker when nr_running==1, so need_more_worker() is sufficient here. And need_more_worker() gives us better readability due to the name of "keep_working()" implies the rescuer should keep working now but the rescuer is actually leaving. Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Tejun Heo <tj@kernel.org>
* workqueue: alloc struct worker on its local nodeLai Jiangshan2017-12-051-4/+4
| | | | | | | | | | | | | | When the create_worker() is called from non-manager, the struct worker is allocated from the node of the caller which may be different from the node of pool->node. So we add a node ID argument for the alloc_worker() to ensure the struct worker is allocated from the preferable node. tj: @nid renamed to @node for consistency. Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Tejun Heo <tj@kernel.org>
* workqueue: reuse the already calculated pwq in try_to_grab_pending()Lai Jiangshan2017-12-051-1/+1
| | | | | | | | | | | | | try_to_grab_pending() was re-calculating the associated pwq using get_work_pwq() when it already has it cached in a local varible and the association can't change. Reuse the local variable instead. This doesn't introduce any functional changes. tj: Updated description. Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Tejun Heo <tj@kernel.org>
* workqueue: stronger test in process_one_work()Lai Jiangshan2017-12-051-7/+1
| | | | | | | | | | | | | | | | | When POOL_DISASSOCIATED is cleared, the running worker's local CPU should be the same as pool->cpu without any exception even during cpu-hotplug. This patch changes "(proposition_A && proposition_B && proposition_C)" to "(proposition_B && proposition_C)", so if the old compound proposition is true, the new one must be true too. so this won't hide any possible bug which can be hit by old test. tj: Minor description update and dropped the obvious comment. CC: Jason J. Herne <jjherne@linux.vnet.ibm.com> CC: Sasha Levin <sasha.levin@oracle.com> Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Tejun Heo <tj@kernel.org>
* workqueue: remove useless WARN_ON_ONCE()Lai Jiangshan2017-12-051-2/+0
| | | | | | | | The @cpu is fetched via smp_processor_id() in this function, so the check is useless. Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Tejun Heo <tj@kernel.org>
* workqueue: sanity check pool->cpu in wq_worker_sleeping()Lai Jiangshan2017-12-051-1/+1
| | | | | | | | | | In theory, pool->cpu is equals to @cpu in wq_worker_sleeping() after worker->flags is checked. And "pool->cpu != cpu" sanity check will help us if something wrong. Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Tejun Heo <tj@kernel.org>
* workqueue: use schedule_timeout_interruptible() instead of open codeLai Jiangshan2017-12-051-2/+1
| | | | | | | | schedule_timeout_interruptible(CREATE_COOLDOWN) is exactly the same as the original code. Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Tejun Heo <tj@kernel.org>
* workqueue: remove the empty check in too_many_workers()Lai Jiangshan2017-12-051-7/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | The commit ea1abd6197d5 ("workqueue: reimplement idle worker rebinding") used a trick which simply removes all to-be-bound idle workers from the idle list and lets them add themselves back after completing rebinding. And this trick caused the @worker_pool->nr_idle may deviate than the actual number of idle workers on @worker_pool->idle_list. More specifically, nr_idle may be non-zero while ->idle_list is empty. All users of ->nr_idle and ->idle_list are audited. The only affected one is too_many_workers() which is updated to check %false if ->idle_list is empty regardless of ->nr_idle. The commit/trick was complicated due to it just tried to simplify an even more complicated problem (workers had to rebind itself). But the commit a9ab775bcadf ("workqueue: directly restore CPU affinity of workers from CPU_ONLINE") fixed all these problems and the mentioned trick was useless and is gone. So, now the @worker_pool->nr_idle is exactly the actual number of workers on @worker_pool->idle_list. too_many_workers() should recover as it was before the trick. So we remove the empty check. Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Tejun Heo <tj@kernel.org>
* workqueue: use "pool->cpu < 0" to stand for an unbound poolLai Jiangshan2017-12-051-1/+1
| | | | | | | | | | | | | | | | | | There is a piece of sanity checks code in the put_unbound_pool(). The meaning of this code is "if it is not an unbound pool, it will complain and return" IIUC. But the code uses "pool->flags & POOL_DISASSOCIATED" imprecisely due to a non-unbound pool may also have this flags. We should use "pool->cpu < 0" to stand for an unbound pool, so we covert the code to it. There is no strictly wrong if we still keep "pool->flags & POOL_DISASSOCIATED" here, but it is just a noise if we keep it: 1) we focus on "unbound" here, not "[dis]association". 2) "pool->cpu < 0" already implies "pool->flags & POOL_DISASSOCIATED". Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Tejun Heo <tj@kernel.org>
* workqueue: Provide destroy_delayed_work_on_stack()Thomas Gleixner2017-12-052-0/+9
| | | | | | | | | | | | If a delayed or deferrable work is on stack we need to tell debug objects that we are destroying the timer and the work. Otherwise we leak the tracking object. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Vince Weaver <vincent.weaver@maine.edu> Acked-by: Tejun Heo <tj@kernel.org> Link: http://lkml.kernel.org/r/20140323141939.911487677@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* workqueue: fix pool ID allocation leakage and remove BUILD_BUG_ON() in ↵Li Bin2017-12-051-6/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | init_workqueues When one work starts execution, the high bits of work's data contain pool ID. It can represent a maximum of WORK_OFFQ_POOL_NONE. Pool ID is assigned WORK_OFFQ_POOL_NONE when the work being initialized indicating that no pool is associated and get_work_pool() uses it to check the associated pool. So if worker_pool_assign_id() assigns a ID greater than or equal WORK_OFFQ_POOL_NONE to a pool, it triggers leakage, and it may break the non-reentrance guarantee. This patch fix this issue by modifying the worker_pool_assign_id() function calling idr_alloc() by setting @end param WORK_OFFQ_POOL_NONE. Furthermore, in the current implementation, the BUILD_BUG_ON() in init_workqueues makes no sense. The number of worker pools needed cannot be determined at compile time, because the number of backing pools for UNBOUND workqueues is dynamic based on the assigned custom attributes. So remove it. tj: Minor comment and indentation updates. Signed-off-by: Li Bin <huawei.libin@huawei.com> Signed-off-by: Tejun Heo <tj@kernel.org>
* workqueue: Fix workqueue stall issue after cpu down failureSe Wang (Patrick) Oh2017-12-051-9/+15
| | | | | | | | | | | | | | When the hotplug notifier call chain with CPU_DOWN_PREPARE is broken before reaching workqueue_cpu_down_callback(), rebind_workers() adds WORKER_REBOUND flag for running workers. Hence, the nr_running of the pool is not increased when scheduler wakes up the worker. The fix is skipping adding WORKER_REBOUND flag when the worker doesn't have WORKER_UNBOUND flag in CPU_DOWN_FAILED path. Change-Id: I2528e9154f4913d9ec14b63adbcbcd1eaa8a8452 Signed-off-by: Se Wang (Patrick) Oh <sewango@codeaurora.org> Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
* workqueue: clear POOL_DISASSOCIATED in rebind_workers()Lai Jiangshan2017-12-051-4/+1
| | | | | | | | | | | | | | | | | | | | | | a9ab775bcadf ("workqueue: directly restore CPU affinity of workers from CPU_ONLINE") moved pool locking into rebind_workers() but left "pool->flags &= ~POOL_DISASSOCIATED" in workqueue_cpu_up_callback(). There is nothing necessarily wrong with it, but there is no benefit either. Let's move it into rebind_workers() and achieve the following benefits: 1) better readability, POOL_DISASSOCIATED is cleared in rebind_workers() as expected. 2) we can guarantee that, when POOL_DISASSOCIATED is clear, the running workers of the pool are on the local CPU (pool->cpu). tj: Minor description update. Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
* ANDROID: initramfs: call free_initrd() when skipping initNick Bray2017-12-051-1/+4
| | | | | | | | | | | | Memory allocated for initrd would not be reclaimed if initializing ramfs was skipped. Bug: 69901741 Test: "grep MemTotal /proc/meminfo" increases by a few MB on an Android device with a/b boot. Change-Id: Ifbe094d303ed12cfd6de6aa004a8a19137a2f58a Signed-off-by: Nick Bray <ncbray@google.com>
* initramfs: Add skip_initramfs command line optionRom Lemarchand2017-12-054-5/+58
| | | | | | | | Add a skip_initramfs option to allow choosing whether to boot using the initramfs or not at runtime. Change-Id: If30428fa748c1d4d3d7b9d97c1f781de5e4558c3 Signed-off-by: Rom Lemarchand <romlem@google.com>
* UPSTREAM: net: xfrm: allow clearing socket xfrm policies.Lorenzo Colitti2017-12-052-1/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently it is possible to add or update socket policies, but not clear them. Therefore, once a socket policy has been applied, the socket cannot be used for unencrypted traffic. This patch allows (privileged) users to clear socket policies by passing in a NULL pointer and zero length argument to the {IP,IPV6}_{IPSEC,XFRM}_POLICY setsockopts. This results in both the incoming and outgoing policies being cleared. The simple approach taken in this patch cannot clear socket policies in only one direction. If desired this could be added in the future, for example by continuing to pass in a length of zero (which currently is guaranteed to return EMSGSIZE) and making the policy be a pointer to an integer that contains one of the XFRM_POLICY_{IN,OUT} enum values. An alternative would have been to interpret the length as a signed integer and use XFRM_POLICY_IN (i.e., 0) to clear the input policy and -XFRM_POLICY_OUT (i.e., -1) to clear the output policy. Bug: 65857891 Change-Id: Ib8fb501a494caa027ce9f9cfec315f5936d3913b Tested: https://android-review.googlesource.com/539816 Signed-off-by: Lorenzo Colitti <lorenzo@google.com> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
* net: xfrm: missing const from "xfrm: Don't use sk_family for socket policy ↵Moyster2017-12-051-1/+1
| | | | | | lookups" fixes this cherry-pick : https://github.com/Moyster/android_kernel_m2note/commit/c112fe63f337712984a4525f43b43081d3138ff3
* tracing: do not leak kernel addressesNick Desaulniers2017-12-031-1/+1
| | | | | | | | This likely breaks tracing tools like trace-cmd. It logs in the same format but now addresses are all 0x0. Bug: 34277115 Change-Id: Ifb0d4d2a184bf0d95726de05b1acee0287a375d9
* ppp: take reference on channels netnsGuillaume Nault2017-12-031-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Let channels hold a reference on their network namespace. Some channel types, like ppp_async and ppp_synctty, can have their userspace controller running in a different namespace. Therefore they can't rely on them to preclude their netns from being removed from under them. ================================================================== BUG: KASAN: use-after-free in ppp_unregister_channel+0x372/0x3a0 at addr ffff880064e217e0 Read of size 8 by task syz-executor/11581 ============================================================================= BUG net_namespace (Not tainted): kasan: bad access detected ----------------------------------------------------------------------------- Disabling lock debugging due to kernel taint INFO: Allocated in copy_net_ns+0x6b/0x1a0 age=92569 cpu=3 pid=6906 [< none >] ___slab_alloc+0x4c7/0x500 kernel/mm/slub.c:2440 [< none >] __slab_alloc+0x4c/0x90 kernel/mm/slub.c:2469 [< inline >] slab_alloc_node kernel/mm/slub.c:2532 [< inline >] slab_alloc kernel/mm/slub.c:2574 [< none >] kmem_cache_alloc+0x23a/0x2b0 kernel/mm/slub.c:2579 [< inline >] kmem_cache_zalloc kernel/include/linux/slab.h:597 [< inline >] net_alloc kernel/net/core/net_namespace.c:325 [< none >] copy_net_ns+0x6b/0x1a0 kernel/net/core/net_namespace.c:360 [< none >] create_new_namespaces+0x2f6/0x610 kernel/kernel/nsproxy.c:95 [< none >] copy_namespaces+0x297/0x320 kernel/kernel/nsproxy.c:150 [< none >] copy_process.part.35+0x1bf4/0x5760 kernel/kernel/fork.c:1451 [< inline >] copy_process kernel/kernel/fork.c:1274 [< none >] _do_fork+0x1bc/0xcb0 kernel/kernel/fork.c:1723 [< inline >] SYSC_clone kernel/kernel/fork.c:1832 [< none >] SyS_clone+0x37/0x50 kernel/kernel/fork.c:1826 [< none >] entry_SYSCALL_64_fastpath+0x16/0x7a kernel/arch/x86/entry/entry_64.S:185 INFO: Freed in net_drop_ns+0x67/0x80 age=575 cpu=2 pid=2631 [< none >] __slab_free+0x1fc/0x320 kernel/mm/slub.c:2650 [< inline >] slab_free kernel/mm/slub.c:2805 [< none >] kmem_cache_free+0x2a0/0x330 kernel/mm/slub.c:2814 [< inline >] net_free kernel/net/core/net_namespace.c:341 [< none >] net_drop_ns+0x67/0x80 kernel/net/core/net_namespace.c:348 [< none >] cleanup_net+0x4e5/0x600 kernel/net/core/net_namespace.c:448 [< none >] process_one_work+0x794/0x1440 kernel/kernel/workqueue.c:2036 [< none >] worker_thread+0xdb/0xfc0 kernel/kernel/workqueue.c:2170 [< none >] kthread+0x23f/0x2d0 kernel/drivers/block/aoe/aoecmd.c:1303 [< none >] ret_from_fork+0x3f/0x70 kernel/arch/x86/entry/entry_64.S:468 INFO: Slab 0xffffea0001938800 objects=3 used=0 fp=0xffff880064e20000 flags=0x5fffc0000004080 INFO: Object 0xffff880064e20000 @offset=0 fp=0xffff880064e24200 CPU: 1 PID: 11581 Comm: syz-executor Tainted: G B 4.4.0+ Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.8.2-0-g33fbe13 by qemu-project.org 04/01/2014 00000000ffffffff ffff8800662c7790 ffffffff8292049d ffff88003e36a300 ffff880064e20000 ffff880064e20000 ffff8800662c77c0 ffffffff816f2054 ffff88003e36a300 ffffea0001938800 ffff880064e20000 0000000000000000 Call Trace: [< inline >] __dump_stack kernel/lib/dump_stack.c:15 [<ffffffff8292049d>] dump_stack+0x6f/0xa2 kernel/lib/dump_stack.c:50 [<ffffffff816f2054>] print_trailer+0xf4/0x150 kernel/mm/slub.c:654 [<ffffffff816f875f>] object_err+0x2f/0x40 kernel/mm/slub.c:661 [< inline >] print_address_description kernel/mm/kasan/report.c:138 [<ffffffff816fb0c5>] kasan_report_error+0x215/0x530 kernel/mm/kasan/report.c:236 [< inline >] kasan_report kernel/mm/kasan/report.c:259 [<ffffffff816fb4de>] __asan_report_load8_noabort+0x3e/0x40 kernel/mm/kasan/report.c:280 [< inline >] ? ppp_pernet kernel/include/linux/compiler.h:218 [<ffffffff83ad71b2>] ? ppp_unregister_channel+0x372/0x3a0 kernel/drivers/net/ppp/ppp_generic.c:2392 [< inline >] ppp_pernet kernel/include/linux/compiler.h:218 [<ffffffff83ad71b2>] ppp_unregister_channel+0x372/0x3a0 kernel/drivers/net/ppp/ppp_generic.c:2392 [< inline >] ? ppp_pernet kernel/drivers/net/ppp/ppp_generic.c:293 [<ffffffff83ad6f26>] ? ppp_unregister_channel+0xe6/0x3a0 kernel/drivers/net/ppp/ppp_generic.c:2392 [<ffffffff83ae18f3>] ppp_asynctty_close+0xa3/0x130 kernel/drivers/net/ppp/ppp_async.c:241 [<ffffffff83ae1850>] ? async_lcp_peek+0x5b0/0x5b0 kernel/drivers/net/ppp/ppp_async.c:1000 [<ffffffff82c33239>] tty_ldisc_close.isra.1+0x99/0xe0 kernel/drivers/tty/tty_ldisc.c:478 [<ffffffff82c332c0>] tty_ldisc_kill+0x40/0x170 kernel/drivers/tty/tty_ldisc.c:744 [<ffffffff82c34943>] tty_ldisc_release+0x1b3/0x260 kernel/drivers/tty/tty_ldisc.c:772 [<ffffffff82c1ef21>] tty_release+0xac1/0x13e0 kernel/drivers/tty/tty_io.c:1901 [<ffffffff82c1e460>] ? release_tty+0x320/0x320 kernel/drivers/tty/tty_io.c:1688 [<ffffffff8174de36>] __fput+0x236/0x780 kernel/fs/file_table.c:208 [<ffffffff8174e405>] ____fput+0x15/0x20 kernel/fs/file_table.c:244 [<ffffffff813595ab>] task_work_run+0x16b/0x200 kernel/kernel/task_work.c:115 [< inline >] exit_task_work kernel/include/linux/task_work.h:21 [<ffffffff81307105>] do_exit+0x8b5/0x2c60 kernel/kernel/exit.c:750 [<ffffffff813fdd20>] ? debug_check_no_locks_freed+0x290/0x290 kernel/kernel/locking/lockdep.c:4123 [<ffffffff81306850>] ? mm_update_next_owner+0x6f0/0x6f0 kernel/kernel/exit.c:357 [<ffffffff813215e6>] ? __dequeue_signal+0x136/0x470 kernel/kernel/signal.c:550 [<ffffffff8132067b>] ? recalc_sigpending_tsk+0x13b/0x180 kernel/kernel/signal.c:145 [<ffffffff81309628>] do_group_exit+0x108/0x330 kernel/kernel/exit.c:880 [<ffffffff8132b9d4>] get_signal+0x5e4/0x14f0 kernel/kernel/signal.c:2307 [< inline >] ? kretprobe_table_lock kernel/kernel/kprobes.c:1113 [<ffffffff8151d355>] ? kprobe_flush_task+0xb5/0x450 kernel/kernel/kprobes.c:1158 [<ffffffff8115f7d3>] do_signal+0x83/0x1c90 kernel/arch/x86/kernel/signal.c:712 [<ffffffff8151d2a0>] ? recycle_rp_inst+0x310/0x310 kernel/include/linux/list.h:655 [<ffffffff8115f750>] ? setup_sigcontext+0x780/0x780 kernel/arch/x86/kernel/signal.c:165 [<ffffffff81380864>] ? finish_task_switch+0x424/0x5f0 kernel/kernel/sched/core.c:2692 [< inline >] ? finish_lock_switch kernel/kernel/sched/sched.h:1099 [<ffffffff81380560>] ? finish_task_switch+0x120/0x5f0 kernel/kernel/sched/core.c:2678 [< inline >] ? context_switch kernel/kernel/sched/core.c:2807 [<ffffffff85d794e9>] ? __schedule+0x919/0x1bd0 kernel/kernel/sched/core.c:3283 [<ffffffff81003901>] exit_to_usermode_loop+0xf1/0x1a0 kernel/arch/x86/entry/common.c:247 [< inline >] prepare_exit_to_usermode kernel/arch/x86/entry/common.c:282 [<ffffffff810062ef>] syscall_return_slowpath+0x19f/0x210 kernel/arch/x86/entry/common.c:344 [<ffffffff85d88022>] int_ret_from_sys_call+0x25/0x9f kernel/arch/x86/entry/entry_64.S:281 Memory state around the buggy address: ffff880064e21680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff880064e21700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff880064e21780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff880064e21800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff880064e21880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== Change-Id: I591b30eafa1b57bd2e211e1f33c39128702ff0b0 Fixes: 273ec51dd7ce ("net: ppp_generic - introduce net-namespace functionality v2") Reported-by: Baozeng Ding <sploving1@gmail.com> Signed-off-by: Guillaume Nault <g.nault@alphalink.fr> Reviewed-by: Cyrill Gorcunov <gorcunov@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* mm/slob.c: remove an unnecessary check for __GFP_ZEROMiles Chen2017-12-021-1/+1
| | | | | | | | | | | | | | Current flow guarantees a valid pointer when handling the __GFP_ZERO case. So remove the unnecessary NULL pointer check. Link: http://lkml.kernel.org/r/1507203141-11959-1-git-send-email-miles.chen@mediatek.com Signed-off-by: Miles Chen <miles.chen@mediatek.com> Cc: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* staging: zcache: delete itGreg Kroah-Hartman2017-12-0229-9392/+0
| | | | | | | | | | | | | zcache is obsolete and not used anymore, Bob Liu has rewritten it and is submitting it for inclusion through the main -mm tree, as it should have been done in the first place... Cc: Bob Liu <lliubbo@gmail.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Kyungmin Park <kmpark@infradead.org> Cc: Wanpeng Li <liwanp@linux.vnet.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Moyster <oysterized@gmail.com>
generated by cgit v1.2.3 (git 2.39.1) at 2026-03-17 20:44:04 +0000