The patch titled
Subject: mm: trace tlb flush after disabling preemption in try_to_unmap_flush
has been added to the -mm tree. Its filename is
mm-send-one-ipi-per-cpu-to-tlb-flush-all-entries-after-unmapping-pages-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-send-one-ipi-per-cpu-to-tlb-flush-all-entries-after-unmapping-pages-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-send-one-ipi-per-cpu-to-tlb-flush-all-entries-after-unmapping-pages-fix.patch
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------------------------------------------------------
From: Sasha Levin <sasha.levin@xxxxxxxxxx>
Subject: mm: trace tlb flush after disabling preemption in try_to_unmap_flush
Commit "mm: send one IPI per CPU to TLB flush all entries after unmapping
pages" added a trace_tlb_flush() while preemption was still enabled. This
means that we'll access smp_processor_id() which in turn will get us quite
a few warnings.
Fix it by moving the trace to where the preemption is disabled, one line
down.
Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/rmap.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff -puN mm/rmap.c~mm-send-one-ipi-per-cpu-to-tlb-flush-all-entries-after-unmapping-pages-fix mm/rmap.c
--- a/mm/rmap.c~mm-send-one-ipi-per-cpu-to-tlb-flush-all-entries-after-unmapping-pages-fix
+++ a/mm/rmap.c
@@ -613,9 +613,10 @@ void try_to_unmap_flush(void)
if (!tlb_ubc->flush_required)
return;
+ cpu = get_cpu();
+
trace_tlb_flush(TLB_REMOTE_SHOOTDOWN, -1UL);
- cpu = get_cpu();
if (cpumask_test_cpu(cpu, &tlb_ubc->cpumask))
percpu_flush_tlb_batch_pages(&tlb_ubc->cpumask);
_
Patches currently in -mm which might be from sasha.levin@xxxxxxxxxx are
mm-cma_debug-fix-debugging-alloc-free-interface.patch
mm-cma_debug-correct-size-input-to-bitmap-function.patch
mm-send-one-ipi-per-cpu-to-tlb-flush-all-entries-after-unmapping-pages-fix.patch
hfshfsplus-cache-pages-correctly-between-bnode_create-and-bnode_free.patch
linux-next.patch
do_shared_fault-check-that-mmap_sem-is-held.patch
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