The patch titled
Subject: generic-dynamic-per-cpu-refcounting-fix
has been added to the -mm tree. Its filename is
generic-dynamic-per-cpu-refcounting-fix.patch
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From: Kent Overstreet <koverstreet@xxxxxxxxxx>
Subject: generic-dynamic-per-cpu-refcounting-fix
I suppose a comment indicating that it is intentionally overflowing is
probably merited.
Cc: Theodore Ts'o <tytso@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/percpu-refcount.c | 7 +++++++
1 file changed, 7 insertions(+)
diff -puN lib/percpu-refcount.c~generic-dynamic-per-cpu-refcounting-fix lib/percpu-refcount.c
--- a/lib/percpu-refcount.c~generic-dynamic-per-cpu-refcounting-fix
+++ a/lib/percpu-refcount.c
@@ -124,6 +124,13 @@ void __percpu_ref_get(struct percpu_ref
v = atomic64_add_return(1 + (1ULL << PCPU_COUNT_BITS),
&ref->count);
+ /*
+ * The high bits of the counter count the number of gets() that
+ * have occured; we check for overflow to call
+ * percpu_ref_alloc() every (1 << (64 - PCPU_COUNT_BITS))
+ * iterations.
+ */
+
if (!(v >> PCPU_COUNT_BITS) &&
REF_STATUS(pcpu_count) == PCPU_REF_NONE && alloc)
percpu_ref_alloc(ref, pcpu_count);
_
Patches currently in -mm which might be from koverstreet@xxxxxxxxxx are
linux-next.patch
mm-remove-old-aio-use_mm-comment.patch
aio-remove-dead-code-from-aioh.patch
gadget-remove-only-user-of-aio-retry.patch
gadget-remove-only-user-of-aio-retry-checkpatch-fixes.patch
aio-remove-retry-based-aio.patch
aio-remove-retry-based-aio-checkpatch-fixes.patch
char-add-aio_readwrite-to-dev-nullzero.patch
aio-kill-return-value-of-aio_complete.patch
aio-add-kiocb_cancel.patch
aio-move-private-stuff-out-of-aioh.patch
aio-dprintk-pr_debug.patch
aio-do-fget-after-aio_get_req.patch
aio-make-aio_put_req-lockless.patch
aio-make-aio_put_req-lockless-checkpatch-fixes.patch
aio-refcounting-cleanup.patch
aio-refcounting-cleanup-checkpatch-fixes.patch
wait-add-wait_event_hrtimeout.patch
aio-make-aio_read_evt-more-efficient-convert-to-hrtimers.patch
aio-make-aio_read_evt-more-efficient-convert-to-hrtimers-checkpatch-fixes.patch
aio-use-flush_dcache_page.patch
aio-use-cancellation-list-lazily.patch
aio-change-reqs_active-to-include-unreaped-completions.patch
aio-kill-batch-allocation.patch
aio-kill-struct-aio_ring_info.patch
aio-give-shared-kioctx-fields-their-own-cachelines.patch
aio-reqs_active-reqs_available.patch
aio-percpu-reqs_available.patch
generic-dynamic-per-cpu-refcounting.patch
generic-dynamic-per-cpu-refcounting-checkpatch-fixes.patch
generic-dynamic-per-cpu-refcounting-fix.patch
aio-percpu-ioctx-refcount.patch
aio-use-xchg-instead-of-completion_lock.patch
aio-dont-include-aioh-in-schedh.patch
aio-dont-include-aioh-in-schedh-fix.patch
aio-kill-ki_key.patch
aio-kill-ki_retry.patch
aio-kill-ki_retry-fix.patch
aio-kill-ki_retry-checkpatch-fixes.patch
block-prep-work-for-batch-completion.patch
block-prep-work-for-batch-completion-checkpatch-fixes.patch
block-prep-work-for-batch-completion-fix.patch
block-prep-work-for-batch-completion-fix-2.patch
block-prep-work-for-batch-completion-fix-3.patch
block-prep-work-for-batch-completion-fix-3-fix.patch
block-aio-batch-completion-for-bios-kiocbs.patch
block-aio-batch-completion-for-bios-kiocbs-checkpatch-fixes.patch
block-aio-batch-completion-for-bios-kiocbs-fix.patch
virtio-blk-convert-to-batch-completion.patch
mtip32xx-convert-to-batch-completion.patch
aio-fix-kioctx-not-being-freed-after-cancellation-at-exit-time.patch
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