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hrtimer_init_on_stack() needs a matching call to
destroy_hrtimer_on_stack(), so both need to be exported.
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit c08376ac97cb202ec65320f3d90d5c4c5e2adb0b)
[astrachan: Fixes {i386,amd64}-allmodconfig build failure in vsoc.ko
noticed by kernelci.org project building kernel/common]
Bug: 79376877
Change-Id: If4d5c466255019322ea21ef38ee5b1b382cce969
Signed-off-by: Alistair Strachan <astrachan@google.com>
Signed-off-by: Moyster <oysterized@gmail.com>
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This was entirely automated, using the script by Al:
PATT='^[[:blank:]]*#[[:blank:]]*include[[:blank:]]*<asm/uaccess.h>'
sed -i -e "s!$PATT!#include <linux/uaccess.h>!" \
$(git grep -l "$PATT"|grep -v ^include/linux/uaccess.h)
to do the replacement at the end of the merge window.
Requested-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Moyster <oysterized@gmail.com>
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Date Wed, 10 Apr 2013 14:07:48 -0700
When switching the hrtimer cpu_base, we briefly allow for
preemption to become enabled by unlocking the cpu_base lock.
During this time, the CPU corresponding to the new cpu_base
that was selected may in fact go offline. In this scenario, the
hrtimer is enqueued to a CPU that's not online, and therefore
it never fires.
As an example, consider this example:
CPU #0 CPU #1
---- ----
... hrtimer_start()
lock_hrtimer_base()
switch_hrtimer_base()
cpu = hrtimer_get_target() -> 1
spin_unlock(&cpu_base->lock)
<migrate thread to CPU #0>
<offline>
spin_lock(&new_base->lock)
this_cpu = 0
cpu != this_cpu
enqueue_hrtimer(cpu_base #1)
To prevent this scenario, verify that the CPU corresponding to
the new cpu_base is indeed online before selecting it in
hrtimer_switch_base(). If it's not online, fallback to using the
base of the current CPU.
Change-Id: I3aaf5b806a25d5a8b96d6ccea7a042d2718091f7
Signed-off-by: Michael Bohan <mbohan@codeaurora.org>
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Date Wed, 10 Apr 2013 14:07:47 -0700
When switching to a new cpu_base in switch_hrtimer_base(), we
briefly enable preemption by unlocking the cpu_base lock in two
places. During this interval it's possible for the running thread
to be swapped to a different CPU.
Consider the following example:
CPU #0 CPU #1
---- ----
hrtimer_start() ...
lock_hrtimer_base()
switch_hrtimer_base()
this_cpu = 0;
target_cpu_base = 0;
raw_spin_unlock(&cpu_base->lock)
<migrate to CPU 1>
... this_cpu == 0
cpu == this_cpu
timer->base = CPU #0
timer->base != LOCAL_CPU
Since the cached this_cpu is no longer accurate, we'll skip the
hrtimer_check_target() check. Once we eventually go to program
the hardware, we'll decide not to do so since it knows the real
CPU that we're running on is not the same as the chosen base. As
a consequence, we may end up missing the hrtimer's deadline.
Fix this by updating the local CPU number each time we retake a
cpu_base lock in switch_hrtimer_base().
Another possibility is to disable preemption across the whole of
switch_hrtimer_base. This looks suboptimal since preemption
would be disabled while waiting for lock(s).
Change-Id: I46be5cf3069f8e6683ad8fff0841949bdb801684
Signed-off-by: Michael Bohan <mbohan@codeaurora.org>
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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
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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 <tglx@linutronix.de>
Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: John Stultz <john.stultz@linaro.org>
Cc: Nicolas Pitre <nicolas.pitre@linaro.org>
Cc: linux-doc@vger.kernel.org
Cc: Lai Jiangshan <jiangshanlai@gmail.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Xing Gao <xgao01@email.wm.edu>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Jessica Frazelle <me@jessfraz.com>
Cc: kernel-hardening@lists.openwall.com
Cc: Nicolas Iooss <nicolas.iooss_linux@m4x.org>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Richard Cochran <richardcochran@gmail.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Michal Marek <mmarek@suse.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Olof Johansson <olof@lixom.net>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-api@vger.kernel.org
Cc: Arjan van de Ven <arjan@linux.intel.com>
Link: http://lkml.kernel.org/r/20170208192659.GA32582@beast
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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