x86/traps: Get rid of unnecessary preempt_disable/preempt_enable_no_resched
authorAlexander Kuleshov <kuleshovmail@gmail.com>
Mon, 28 Nov 2016 07:50:57 +0000 (13:50 +0600)
committerThomas Gleixner <tglx@linutronix.de>
Sat, 4 Feb 2017 08:36:59 +0000 (09:36 +0100)
commit07d495dae20717b00881798ef812f7aa53ca0eb3
tree1971fa9711049b5f90653cfc9fc940722466f50f
parent68dee8e2f2cacc54d038394e70d22411dee89da2
x86/traps: Get rid of unnecessary preempt_disable/preempt_enable_no_resched

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>
arch/x86/kernel/traps.c