The patch titled
Subject: filemap: fix the last_index of mm_filemap_get_pages
has been added to the -mm mm-unstable branch. Its filename is
filemap-fix-the-last_index-of-mm_filemap_get_pages.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/filemap-fix-the-last_index-of-mm_filemap_get_pages.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Takaya Saeki <takayas@xxxxxxxxxxxx>
Subject: filemap: fix the last_index of mm_filemap_get_pages
Date: Tue, 3 Sep 2024 10:21:00 +0000
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.
Link: https://lkml.kernel.org/r/20240903102100.70405-1-takayas@xxxxxxxxxxxx
Fixes: b6273b55d885 ("filemap: add trace events for get_pages, map_pages, and fault")
Signed-off-by: Takaya Saeki <takayas@xxxxxxxxxxxx>
Cc: Junichi Uekawa <uekawa@xxxxxxxxxxxx>
Cc: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Cc: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/filemap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/filemap.c~filemap-fix-the-last_index-of-mm_filemap_get_pages
+++ a/mm/filemap.c
@@ -2571,7 +2571,7 @@ retry:
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)
_
Patches currently in -mm which might be from takayas@xxxxxxxxxxxx are
filemap-fix-the-last_index-of-mm_filemap_get_pages.patch
