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authorLinus Torvalds <torvalds@linux-foundation.org>2013-05-05 20:37:16 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2013-05-05 20:37:16 +0200
commit64049d1973c1735f543eb7a55653e291e108b0cb (patch)
tree1b13645ee288a561feccafd9fa84951220f5f651 /kernel/events
parentMerge tag 'modules-next-for-linus' of git://git.kernel.org/pub/scm/linux/kern... (diff)
parentperf/x86/intel/lbr: Demand proper privileges for PERF_SAMPLE_BRANCH_KERNEL (diff)
downloadlinux-64049d1973c1735f543eb7a55653e291e108b0cb.tar.xz
linux-64049d1973c1735f543eb7a55653e291e108b0cb.zip
Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull perf fixes from Ingo Molnar: "Misc fixes plus a small hw-enablement patch for Intel IB model 58 uncore events" * 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: perf/x86/intel/lbr: Demand proper privileges for PERF_SAMPLE_BRANCH_KERNEL perf/x86/intel/lbr: Fix LBR filter perf/x86: Blacklist all MEM_*_RETIRED events for Ivy Bridge perf: Fix vmalloc ring buffer pages handling perf/x86/intel: Fix unintended variable name reuse perf/x86/intel: Add support for IvyBridge model 58 Uncore perf/x86/intel: Fix typo in perf_event_intel_uncore.c x86: Eliminate irq_mis_count counted in arch_irq_stat
Diffstat (limited to 'kernel/events')
-rw-r--r--kernel/events/ring_buffer.c14
1 files changed, 10 insertions, 4 deletions
diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c
index 97fddb09762b..cd55144270b5 100644
--- a/kernel/events/ring_buffer.c
+++ b/kernel/events/ring_buffer.c
@@ -326,11 +326,16 @@ void rb_free(struct ring_buffer *rb)
}
#else
+static int data_page_nr(struct ring_buffer *rb)
+{
+ return rb->nr_pages << page_order(rb);
+}
struct page *
perf_mmap_to_page(struct ring_buffer *rb, unsigned long pgoff)
{
- if (pgoff > (1UL << page_order(rb)))
+ /* The '>' counts in the user page. */
+ if (pgoff > data_page_nr(rb))
return NULL;
return vmalloc_to_page((void *)rb->user_page + pgoff * PAGE_SIZE);
@@ -350,10 +355,11 @@ static void rb_free_work(struct work_struct *work)
int i, nr;
rb = container_of(work, struct ring_buffer, work);
- nr = 1 << page_order(rb);
+ nr = data_page_nr(rb);
base = rb->user_page;
- for (i = 0; i < nr + 1; i++)
+ /* The '<=' counts in the user page. */
+ for (i = 0; i <= nr; i++)
perf_mmap_unmark_page(base + (i * PAGE_SIZE));
vfree(base);
@@ -387,7 +393,7 @@ struct ring_buffer *rb_alloc(int nr_pages, long watermark, int cpu, int flags)
rb->user_page = all_buf;
rb->data_pages[0] = all_buf + PAGE_SIZE;
rb->page_order = ilog2(nr_pages);
- rb->nr_pages = 1;
+ rb->nr_pages = !!nr_pages;
ring_buffer_init(rb, watermark, flags);