linux-kernel - [PATCH v5 7/9] mm: Add guard for mmap_read

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Message-ID: <20250424192613.526636593@goodmis.org>
Date: Thu, 24 Apr 2025 15:25:03 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: linux-kernel@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org
Cc: Masami Hiramatsu <mhiramat@...nel.org>,
 Mark Rutland <mark.rutland@....com>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Andrew Morton <akpm@...ux-foundation.org>,
 Josh Poimboeuf <jpoimboe@...nel.org>,
 x86@...nel.org,
 Peter Zijlstra <peterz@...radead.org>,
 Ingo Molnar <mingo@...nel.org>,
 Arnaldo Carvalho de Melo <acme@...nel.org>,
 Indu Bhagat <indu.bhagat@...cle.com>,
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
 Jiri Olsa <jolsa@...nel.org>,
 Namhyung Kim <namhyung@...nel.org>,
 Ian Rogers <irogers@...gle.com>,
 Adrian Hunter <adrian.hunter@...el.com>,
 linux-perf-users@...r.kernel.org,
 Mark Brown <broonie@...nel.org>,
 linux-toolchains@...r.kernel.org,
 Jordan Rome <jordalgo@...a.com>,
 Sam James <sam@...too.org>,
 Andrii Nakryiko <andrii.nakryiko@...il.com>,
 Jens Remus <jremus@...ux.ibm.com>,
 Florian Weimer <fweimer@...hat.com>,
 Andy Lutomirski <luto@...nel.org>,
 Weinan Liu <wnliu@...gle.com>,
 Blake Jones <blakejones@...gle.com>,
 Beau Belgrave <beaub@...ux.microsoft.com>,
 "Jose E. Marchesi" <jemarch@....org>,
 Alexander Aring <aahringo@...hat.com>
Subject: [PATCH v5 7/9] mm: Add guard for mmap_read_lock

From: Josh Poimboeuf <jpoimboe@...nel.org>

This is the new way of doing things.  Converting all existing
mmap_read_lock users is an exercise left for the reader ;-)

Suggested-by: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>
---
 include/linux/mmap_lock.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/mmap_lock.h b/include/linux/mmap_lock.h
index 4706c6769902..cfa5ab84054a 100644
--- a/include/linux/mmap_lock.h
+++ b/include/linux/mmap_lock.h
@@ -222,4 +222,6 @@ static inline int mmap_lock_is_contended(struct mm_struct *mm)
 	return rwsem_is_contended(&mm->mmap_lock);
 }

+DEFINE_GUARD(mmap_read_lock, struct mm_struct *, mmap_read_lock(_T), mmap_read_unlock(_T))
+
 #endif /* _LINUX_MMAP_LOCK_H */
-- 
2.47.2