diff options
| author | Suresh Siddha <suresh.b.siddha@intel.com> | 2008-11-04 21:53:04 (GMT) |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-11-06 08:41:49 (GMT) |
| commit | d6f0f39b7d05e62b347c4352d070e4afb3ade4b5 (patch) | |
| tree | f5f2e844e5674b1d572be2b6e54fb36e5540cbe3 /arch/x86/kernel/tlb_64.c | |
| parent | 7db282fa67b58daff8a57f9e1c93d4474b5908ff (diff) | |
| download | linux-d6f0f39b7d05e62b347c4352d070e4afb3ade4b5.tar.xz | |
x86: add smp_mb() before sending INVALIDATE_TLB_VECTOR
Impact: fix rare x2apic hang
On x86, x2apic mode accesses for sending IPI's don't have serializing
semantics. If the IPI receivner refers(in lock-free fashion) to some
memory setup by the sender, the need for smp_mb() before sending the
IPI becomes critical in x2apic mode.
Add the smp_mb() in native_flush_tlb_others() before sending the IPI.
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/tlb_64.c')
| -rw-r--r-- | arch/x86/kernel/tlb_64.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/x86/kernel/tlb_64.c b/arch/x86/kernel/tlb_64.c index dcbf7a1..8f919ca 100644 --- a/arch/x86/kernel/tlb_64.c +++ b/arch/x86/kernel/tlb_64.c @@ -183,6 +183,11 @@ void native_flush_tlb_others(const cpumask_t *cpumaskp, struct mm_struct *mm, cpus_or(f->flush_cpumask, cpumask, f->flush_cpumask); /* + * Make the above memory operations globally visible before + * sending the IPI. + */ + smp_mb(); + /* * We have to send the IPI only to * CPUs affected. */ |