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  1. Bug #706060
  2. Comment #3

Comment 3 for bug 706060

Revision history for this message
Andy Whitcroft (apw) wrote :

The fix below is claimed to fix this issue:

  commit 9d55b9923a1b7ea8193b8875c57ec940dc2ff027
  Author: Thomas Gleixner <email address hidden>
  Date: Fri Feb 1 17:45:14 2008 +0100

    x86: replace LOCK_PREFIX in futex.h

    The exception fixup for the futex macros __futex_atomic_op1/2 and
    futex_atomic_cmpxchg_inatomic() is missing an entry when the lock
    prefix is replaced by a NOP via SMP alternatives.

    Chuck Ebert tracked this down from the information provided in:
    https://bugzilla.redhat.com/show_bug.cgi?id=429412

    A possible solution would be to add another fixup after the
    LOCK_PREFIX, so both the LOCK and NOP case have their own entry in the
    exception table, but it's not really worth the trouble.

    Simply replace LOCK_PREFIX with lock and keep those untouched by SMP
    alternatives.

    Signed-off-by: Thomas Gleixner <email address hidden>

    Signed-off-by: Ingo Molnar <email address hidden>