In commit b6273b55d885 ("filemap: add trace events for get_pages,
map_pages, and fault"), mm_filemap_get_pages was added to trace page
cache access. However, it tracks an extra page beyond the end of the
accessed range. This patch fixes it by replacing last_index with
last_index - 1.
Fixes: b6273b55d885 ("filemap: add trace events for get_pages, map_pages, and fault")
Signed-off-by: Takaya Saeki <takayas@xxxxxxxxxxxx>
---
mm/filemap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/filemap.c b/mm/filemap.c
index fcfec2a78a30..d725d84b1947 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2548,7 +2548,7 @@ static int filemap_get_pages(struct kiocb *iocb, size_t count,
goto err;
}
- trace_mm_filemap_get_pages(mapping, index, last_index);
+ trace_mm_filemap_get_pages(mapping, index, last_index - 1);
return 0;
err:
if (err < 0)
--
2.46.0.469.g59c65b2a67-goog
