x86, mm: fault.c, give another attempt at prefetch handing before SIGBUS

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Impact: extend prefetch handling on 64-bit

Currently there's an extra is_prefetch() check done in do_sigbus(),
which we only do on 32 bits.

This is a last-ditch check before we terminate a task, so it's worth
giving prefetch instructions another chance - should none of our
existing quirks have caught a prefetch instruction related spurious
fault.

The only risk is if a prefetch causes a real sigbus, in that case
we'll not OOM but try another fault. But this code has been on
32-bit for a long time, so it should be fine in practice.

So do this on 64-bit too - and thus remove one more #ifdef.

Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

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This commit is contained in:

Ingo Molnar 2009-02-20 23:39:02 +01:00

parent 7c178a26d3

commit cd1b68f08f

1 changed files with 1 additions and 3 deletions

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arch/x86/mm/fault.c

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