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authorYunfeng Ye <yeyunfeng@huawei.com>2019-10-14 16:15:57 +0800
committerPeter Zijlstra <peterz@infradead.org>2019-10-17 21:31:55 +0200
commitd7e78706e43107fa269fe34b1a69e653f5ec9f2c (patch)
tree123ce021f2ad3c6a16bc359bd5f98296d94be3db /kernel/events/ring_buffer.c
parent8a9f91c51ea72b126864e0db616b1bac12261200 (diff)
perf/ring_buffer: Matching the memory allocate and free, in rb_alloc()
Currently perf_mmap_alloc_page() is used to allocate memory in rb_alloc(), but using free_page() to free memory in the failure path. It's better to use perf_mmap_free_page() instead. Signed-off-by: Yunfeng Ye <yeyunfeng@huawei.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: <jolsa@redhat.co> Cc: <acme@kernel.org> Cc: <mingo@redhat.com> Cc: <mark.rutland@arm.com> Cc: <namhyung@kernel.org> Cc: <alexander.shishkin@linux.intel.com> Link: https://lkml.kernel.org/r/575c7e8c-90c7-4e3a-b41d-f894d8cdbd7f@huawei.com
Diffstat (limited to 'kernel/events/ring_buffer.c')
-rw-r--r--kernel/events/ring_buffer.c20
1 files changed, 10 insertions, 10 deletions
diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c
index abc145cbfedf..246c83ac5643 100644
--- a/kernel/events/ring_buffer.c
+++ b/kernel/events/ring_buffer.c
@@ -754,6 +754,14 @@ static void *perf_mmap_alloc_page(int cpu)
return page_address(page);
}
+static void perf_mmap_free_page(void *addr)
+{
+ struct page *page = virt_to_page(addr);
+
+ page->mapping = NULL;
+ __free_page(page);
+}
+
struct ring_buffer *rb_alloc(int nr_pages, long watermark, int cpu, int flags)
{
struct ring_buffer *rb;
@@ -788,9 +796,9 @@ struct ring_buffer *rb_alloc(int nr_pages, long watermark, int cpu, int flags)
fail_data_pages:
for (i--; i >= 0; i--)
- free_page((unsigned long)rb->data_pages[i]);
+ perf_mmap_free_page(rb->data_pages[i]);
- free_page((unsigned long)rb->user_page);
+ perf_mmap_free_page(rb->user_page);
fail_user_page:
kfree(rb);
@@ -799,14 +807,6 @@ fail:
return NULL;
}
-static void perf_mmap_free_page(void *addr)
-{
- struct page *page = virt_to_page(addr);
-
- page->mapping = NULL;
- __free_page(page);
-}
-
void rb_free(struct ring_buffer *rb)
{
int i;