path: root/ipc
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authorLoic Prylli <>2007-07-06 02:39:52 -0700
committerLinus Torvalds <>2007-07-06 10:23:43 -0700
commitd25c1ba2fa1a9a1a4f68bef8edb0efefd79f0012 (patch)
tree105a72189d2783bfbca1ffda4f5ebf968ac69496 /ipc
parent1e2e99f0e4aa6363e8515ed17011c210c8f1b52a (diff)
MTRR: Fix race causing set_mtrr to go into infinite loop
Processors synchronization in set_mtrr requires the .gate field to be set after .count field is properly initialized. Without an explicit barrier, the compiler was reordering those memory stores. That was sometimes causing a processor (in ipi_handler) to see the .gate change and decrement .count before the latter is set by set_mtrr() (which then hangs in a infinite loop with irqs disabled). Signed-off-by: Loic Prylli <> Cc: Andi Kleen <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
Diffstat (limited to 'ipc')
0 files changed, 0 insertions, 0 deletions