linux-kernel - [PATCH bpf-next v4 2/4] uaccess: Define pagefault lock guard

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Message-ID: <39416cac1d011661601caffc6ac38195c82ede86.1746598898.git.vmalik@redhat.com>
Date: Wed,  7 May 2025 08:40:37 +0200
From: Viktor Malik <vmalik@...hat.com>
To: bpf@...r.kernel.org
Cc: Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Eduard Zingerman <eddyz87@...il.com>,
	Song Liu <song@...nel.org>,
	Yonghong Song <yonghong.song@...ux.dev>,
	John Fastabend <john.fastabend@...il.com>,
	KP Singh <kpsingh@...nel.org>,
	Stanislav Fomichev <sdf@...ichev.me>,
	Hao Luo <haoluo@...gle.com>,
	Jiri Olsa <jolsa@...nel.org>,
	linux-kernel@...r.kernel.org,
	Viktor Malik <vmalik@...hat.com>
Subject: [PATCH bpf-next v4 2/4] uaccess: Define pagefault lock guard

Define a pagefault lock guard which allows to simplify functions that
need to disable page faults.

Signed-off-by: Viktor Malik <vmalik@...hat.com>
---
 include/linux/uaccess.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/uaccess.h b/include/linux/uaccess.h
index 7c06f4795670..1beb5b395d81 100644
--- a/include/linux/uaccess.h
+++ b/include/linux/uaccess.h
@@ -296,6 +296,8 @@ static inline bool pagefault_disabled(void)
  */
 #define faulthandler_disabled() (pagefault_disabled() || in_atomic())
 
+DEFINE_LOCK_GUARD_0(pagefault, pagefault_disable(), pagefault_enable())
+
 #ifndef CONFIG_ARCH_HAS_SUBPAGE_FAULTS
 
 /**
-- 
2.49.0