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Subject[tip: perf/core] perf/ring_buffer: Matching the memory allocate and free, in rb_alloc()
The following commit has been merged into the perf/core branch of tip:

Commit-ID: d7e78706e43107fa269fe34b1a69e653f5ec9f2c
Gitweb: https://git.kernel.org/tip/d7e78706e43107fa269fe34b1a69e653f5ec9f2c
Author: Yunfeng Ye <yeyunfeng@huawei.com>
AuthorDate: Mon, 14 Oct 2019 16:15:57 +08:00
Committer: Peter Zijlstra <peterz@infradead.org>
CommitterDate: Thu, 17 Oct 2019 21:31:55 +02:00

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
---
kernel/events/ring_buffer.c | 20 ++++++++++----------
1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c
index abc145c..246c83a 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;
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