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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2014-01-22 05:48:41 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-01-22 05:48:41 +0400 |
| commit | 5cb7398caf69e3943df78435a19a8a77fe8b9463 (patch) | |
| tree | 3b81cdc17dcbcecbd18b722988648b36297288fd | |
| parent | 4a2829b97654ec773dabc681f232ab11cb347d01 (diff) | |
| parent | 8a0921712ec6d00754b5d7afea78137772efee0a (diff) | |
| download | linux-5cb7398caf69e3943df78435a19a8a77fe8b9463.tar.xz | |
Merge branch 'for-3.14' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu
Pull percpu changes from Tejun Heo:
"Two trivial changes - addition of WARN_ONCE() in lib/percpu-refcount.c
and use of VMALLOC_TOTAL instead of END - START in percpu.c"
* 'for-3.14' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu:
percpu: use VMALLOC_TOTAL instead of VMALLOC_END - VMALLOC_START
percpu-refcount: Add a WARN() for ref going negative
| -rw-r--r-- | lib/percpu-refcount.c | 3 | ||||
| -rw-r--r-- | mm/percpu.c | 4 |
2 files changed, 5 insertions, 2 deletions
diff --git a/lib/percpu-refcount.c b/lib/percpu-refcount.c index 1a53d497a8c5..963b7034a51b 100644 --- a/lib/percpu-refcount.c +++ b/lib/percpu-refcount.c @@ -120,6 +120,9 @@ static void percpu_ref_kill_rcu(struct rcu_head *rcu) atomic_add((int) count - PCPU_COUNT_BIAS, &ref->count); + WARN_ONCE(atomic_read(&ref->count) <= 0, "percpu ref <= 0 (%i)", + atomic_read(&ref->count)); + /* @ref is viewed as dead on all CPUs, send out kill confirmation */ if (ref->confirm_kill) ref->confirm_kill(ref); diff --git a/mm/percpu.c b/mm/percpu.c index 0d10defe951e..afbf352ae580 100644 --- a/mm/percpu.c +++ b/mm/percpu.c @@ -1686,10 +1686,10 @@ int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size, max_distance += ai->unit_size; /* warn if maximum distance is further than 75% of vmalloc space */ - if (max_distance > (VMALLOC_END - VMALLOC_START) * 3 / 4) { + if (max_distance > VMALLOC_TOTAL * 3 / 4) { pr_warning("PERCPU: max_distance=0x%zx too large for vmalloc " "space 0x%lx\n", max_distance, - (unsigned long)(VMALLOC_END - VMALLOC_START)); + VMALLOC_TOTAL); #ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK /* and fail if we have fallback */ rc = -EINVAL; |