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| author | Dave Hansen <dave.hansen@linux.intel.com> | 2014-08-07 10:58:41 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2014-08-08 10:35:00 +0200 |
| commit | 7c7f1547b627092737493f0781780af85cc9b1a4 (patch) | |
| tree | e69021da61739045589ad097cf6bd959397b0ca9 /arch/x86 | |
| parent | 98a96f202203fecad65b44449077c695686ad4db (diff) | |
| download | linux-7c7f1547b627092737493f0781780af85cc9b1a4.tar.gz linux-7c7f1547b627092737493f0781780af85cc9b1a4.tar.bz2 linux-7c7f1547b627092737493f0781780af85cc9b1a4.zip | |
x86/mm: Fix RCU splat from new TLB tracepoints
Dave Jones reported seeing a bug from one of my TLB tracepoints:
http://lkml.kernel.org/r/20140806181801.GA4605@redhat.com
According to Paul McKenney, the right way to fix this is adding
an _rcuidle suffix to the tracepoint.
http://lkml.kernel.org/r/20140807065055.GA5821@linux.vnet.ibm.com
This patch does just that.
Reported-by: Dave Jones <davej@redhat.com>,
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Dave Hansen <dave@sr71.net>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/20140807175841.5C92D878@viggo.jf.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/mm/tlb.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c index 1fe33987de02..98b7976d44af 100644 --- a/arch/x86/mm/tlb.c +++ b/arch/x86/mm/tlb.c @@ -49,7 +49,13 @@ void leave_mm(int cpu) if (cpumask_test_cpu(cpu, mm_cpumask(active_mm))) { cpumask_clear_cpu(cpu, mm_cpumask(active_mm)); load_cr3(swapper_pg_dir); - trace_tlb_flush(TLB_FLUSH_ON_TASK_SWITCH, TLB_FLUSH_ALL); + /* + * This gets called in the idle path where RCU + * functions differently. Tracing normally + * uses RCU, so we have to call the tracepoint + * specially here. + */ + trace_tlb_flush_rcuidle(TLB_FLUSH_ON_TASK_SWITCH, TLB_FLUSH_ALL); } } EXPORT_SYMBOL_GPL(leave_mm); |