xavi/android_kernel_m2note/kernel/timer.c, branch o-8.1

Replace with globally

2018-11-29T17:33:35+00:00

This was entirely automated, using the script by Al: PATT='^[[:blank:]]*#[[:blank:]]*include[[:blank:]]*' sed -i -e "s!$PATT!#include !" \ $(git grep -l "$PATT"|grep -v ^include/linux/uaccess.h) to do the replacement at the end of the merge window. Requested-by: Al Viro Signed-off-by: Linus Torvalds Signed-off-by: Moyster

Get rid of __cpuinit

2017-04-11T09:00:11+00:00

This commit is the result of find . -name '*.c' | xargs sed -i 's/ __cpuinit / /g' find . -name '*.c' | xargs sed -i 's/ __cpuexit / /g' find . -name '*.c' | xargs sed -i 's/ __cpuinitdata / /g' find . -name '*.c' | xargs sed -i 's/ __cpuinit$//g' find ./arch/ -name '*.h' | xargs sed -i 's/ __cpuinit//g' find . -name '*.c' | xargs sed -i 's/^__cpuinit //g' find . -name '*.c' | xargs sed -i 's/^__cpuinitdata //g' find . -name '*.c' | xargs sed -i 's/\*__cpuinit /\*/g' find . -name '*.c' | xargs sed -i 's/ __cpuinitconst / /g' find . -name '*.h' | xargs sed -i 's/ __cpuinit / /g' find . -name '*.h' | xargs sed -i 's/ __cpuinitdata / /g' git add . git reset include/linux/init.h git checkout -- include/linux/init.h based off : https://github.com/jollaman999/jolla-kernel_bullhead/commit/bc15db84a622eed7d61d3ece579b577154d0ec29

time: Remove CONFIG_TIMER_STATS

2017-04-11T08:57:35+00:00

Currently CONFIG_TIMER_STATS exposes process information across namespaces: kernel/time/timer_list.c print_timer(): SEQ_printf(m, ", %s/%d", tmp, timer->start_pid); /proc/timer_list: #11: <0000000000000000>, hrtimer_wakeup, S:01, do_nanosleep, cron/2570 Given that the tracer can give the same information, this patch entirely removes CONFIG_TIMER_STATS. Change-Id: Ice26d74094d3ad563808342c1604ad444234844b Suggested-by: Thomas Gleixner Signed-off-by: Kees Cook Acked-by: John Stultz Cc: Nicolas Pitre Cc: linux-doc@vger.kernel.org Cc: Lai Jiangshan Cc: Shuah Khan Cc: Xing Gao Cc: Jonathan Corbet Cc: Jessica Frazelle Cc: kernel-hardening@lists.openwall.com Cc: Nicolas Iooss Cc: "Paul E. McKenney" Cc: Petr Mladek Cc: Richard Cochran Cc: Tejun Heo Cc: Michal Marek Cc: Josh Poimboeuf Cc: Dmitry Vyukov Cc: Oleg Nesterov Cc: "Eric W. Biederman" Cc: Olof Johansson Cc: Andrew Morton Cc: linux-api@vger.kernel.org Cc: Arjan van de Ven Link: http://lkml.kernel.org/r/20170208192659.GA32582@beast Signed-off-by: Thomas Gleixner

timers: Use proper base migration in add_timer_on()

2017-04-11T08:57:08+00:00

commit 22b886dd1018093920c4250dee2a9a3cb7cff7b8 upstream. Regardless of the previous CPU a timer was on, add_timer_on() currently simply sets timer->flags to the new CPU. As the caller must be seeing the timer as idle, this is locally fine, but the timer leaving the old base while unlocked can lead to race conditions as follows. Let's say timer was on cpu 0. cpu 0 cpu 1 ----------------------------------------------------------------------------- del_timer(timer) succeeds del_timer(timer) lock_timer_base(timer) locks cpu_0_base add_timer_on(timer, 1) spin_lock(&cpu_1_base->lock) timer->flags set to cpu_1_base operates on @timer operates on @timer This triggered with mod_delayed_work_on() which contains "if (del_timer()) add_timer_on()" sequence eventually leading to the following oops. BUG: unable to handle kernel NULL pointer dereference at (null) IP: [] detach_if_pending+0x69/0x1a0 ... Workqueue: wqthrash wqthrash_workfunc [wqthrash] task: ffff8800172ca680 ti: ffff8800172d0000 task.ti: ffff8800172d0000 RIP: 0010:[] [] detach_if_pending+0x69/0x1a0 ... Call Trace: [] del_timer+0x44/0x60 [] try_to_grab_pending+0xb6/0x160 [] mod_delayed_work_on+0x33/0x80 [] wqthrash_workfunc+0x61/0x90 [wqthrash] [] process_one_work+0x1e8/0x650 [] worker_thread+0x4e/0x450 [] kthread+0xef/0x110 [] ret_from_fork+0x3f/0x70 Fix it by updating add_timer_on() to perform proper migration as __mod_timer() does. Mike: apply tglx backport Reported-and-tested-by: Jeff Layton Signed-off-by: Tejun Heo Cc: Chris Worley Cc: bfields@fieldses.org Cc: Michael Skralivetsky Cc: Trond Myklebust Cc: Shaohua Li Cc: Jeff Layton Cc: kernel-team@fb.com Cc: stable@vger.kernel.org Link: http://lkml.kernel.org/r/20151029103113.2f893924@tlielax.poochiereds.net Link: http://lkml.kernel.org/r/20151104171533.GI5749@mtj.duckdns.org Signed-off-by: Thomas Gleixner Signed-off-by: Mike Galbraith Signed-off-by: Jiri Slaby

timer: optimize apply_slack()

2016-09-13T11:23:02+00:00

__fls(mask) is equivalent to find_last_bit(&mask, BITS_PER_LONG), but cheaper

Optimise apply_slack() for size and speed.

2016-08-26T18:20:22+00:00

To apply proper slack, the original algorithm used to prepare a mask and then apply the mask to obtain the appropriately rounded-off absolute time the timer expires. This patch modifies the masking logic to a bit-shift logic, therby reducing the complexity and number of operations. Thus obtaining a minor speed-up. Signed-off-by: Chinmay V S Signed-off-by: Stefan Guendhoer

first commit

2016-08-15T02:19:42+00:00