x86/entry/32: Clarify register saving in __switch_to_asm()

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commit 6690e86be8 ("sched/x86: Save [ER]FLAGS on context switch")
re-introduced the flags saving on context switch to prevent AC leakage.

The pushf/popf instructions are right among the callee saved register
section, so the comment explaining the save/restore is not entirely
correct.

Add a seperate comment to pushf/popf explaining the reason.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

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This commit is contained in:

Thomas Gleixner 2019-11-16 11:12:03 +01:00

parent e638ad0080

commit a3ba966066

1 changed files with 7 additions and 1 deletions

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arch/x86/entry/entry_32.S

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