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| author | Suresh Siddha <suresh.b.siddha@intel.com> | 2008-11-04 13:53:04 -0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-11-06 09:41:49 +0100 |
| commit | d6f0f39b7d05e62b347c4352d070e4afb3ade4b5 (patch) | |
| tree | f5f2e844e5674b1d572be2b6e54fb36e5540cbe3 | |
| parent | 7db282fa67b58daff8a57f9e1c93d4474b5908ff (diff) | |
| download | linux-d6f0f39b7d05e62b347c4352d070e4afb3ade4b5.tar.gz linux-d6f0f39b7d05e62b347c4352d070e4afb3ade4b5.tar.bz2 linux-d6f0f39b7d05e62b347c4352d070e4afb3ade4b5.zip | |
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>
| -rw-r--r-- | arch/x86/kernel/tlb_32.c | 6 | ||||
| -rw-r--r-- | arch/x86/kernel/tlb_64.c | 5 |
2 files changed, 11 insertions, 0 deletions
diff --git a/arch/x86/kernel/tlb_32.c b/arch/x86/kernel/tlb_32.c index e00534b33534..f4049f3513b6 100644 --- a/arch/x86/kernel/tlb_32.c +++ b/arch/x86/kernel/tlb_32.c @@ -154,6 +154,12 @@ void native_flush_tlb_others(const cpumask_t *cpumaskp, struct mm_struct *mm, flush_mm = mm; flush_va = va; cpus_or(flush_cpumask, cpumask, 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. diff --git a/arch/x86/kernel/tlb_64.c b/arch/x86/kernel/tlb_64.c index dcbf7a1159ea..8f919ca69494 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. */ |