x86, traps: Add ist_begin_non_atomic and ist_end_non_atomic

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In some IST handlers, if the interrupt came from user mode,
we can safely enable preemption.  Add helpers to do it safely.

This is intended to be used my the memory failure code in
do_machine_check.

Acked-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Andy Lutomirski <luto@amacapital.net>

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Andy Lutomirski 2014-11-19 17:59:41 -08:00

parent 83653c16da

commit bced35b65a

2 changed files with 40 additions and 0 deletions

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arch/x86/include/asm/traps.h

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38

arch/x86/kernel/traps.c

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