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filemap: fix the last_index of mm_filemap_get_pages

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In commit b6273b55d8 ("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@chromium.org
Fixes: b6273b55d8 ("filemap: add trace events for get_pages, map_pages, and fault")
Signed-off-by: Takaya Saeki <takayas@chromium.org>
Cc: Junichi Uekawa <uekawa@chromium.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Takaya Saeki 2024-09-03 10:21:00 +00:00 committed by Andrew Morton
parent e1e4cfd01a
commit fc1b43c422
1 changed files with 1 additions and 1 deletions
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2
mm/filemap.c
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@ -2567,7 +2567,7 @@ retry:
goto err; goto err;
} }
trace_mm_filemap_get_pages(mapping, index, last_index); trace_mm_filemap_get_pages(mapping, index, last_index - 1);
return 0; return 0;
err: err:
if (err < 0) if (err < 0)