x86/traps: Get rid of unnecessary preempt_disable/preempt_enable_no_resched

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Exception handlers which may run on IST stack call ist_enter() at the start
of execution and ist_exit() in the end. ist_enter() disables preemption
unconditionally and ist_exit() enables it.

So the extra preempt_disable/enable() pairs nested inside the
ist_enter/exit() regions are pointless and can be removed.

Signed-off-by: Alexander Kuleshov <kuleshovmail@gmail.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Jianyu Zhan <nasa4836@gmail.com>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@suse.de>
Link: http://lkml.kernel.org/r/20161128075057.7724-1-kuleshovmail@gmail.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

...

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Alexander Kuleshov 2016-11-28 13:50:57 +06:00 • committed by Thomas Gleixner

parent 68dee8e2f2

commit 07d495dae2

1 changed files with 0 additions and 5 deletions

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arch/x86/kernel/traps.c

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