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Message-Id: <20241016123036.21366-2-qiuxu.zhuo@intel.com>
Date: Wed, 16 Oct 2024 20:30:27 +0800
From: Qiuxu Zhuo <qiuxu.zhuo@...el.com>
To: tony.luck@...el.com,
bp@...en8.de
Cc: tglx@...utronix.de,
dave.hansen@...ux.intel.com,
mingo@...hat.com,
hpa@...or.com,
x86@...nel.org,
linux-edac@...r.kernel.org,
linux-kernel@...r.kernel.org,
qiuxu.zhuo@...el.com
Subject: [PATCH v2 01/10] x86/mce/dev-mcelog: Use xchg() to get and clear the flags
Using xchg() to atomically get and clear the MCE log buffer flags,
streamlines the code and reduces the text size by 20 bytes.
$ size dev-mcelog.o.*
text data bss dec hex filename
3013 360 160 3533 dcd dev-mcelog.o.old
2993 360 160 3513 db9 dev-mcelog.o.new
No functional changes intended.
Reviewed-by: Tony Luck <tony.luck@...el.com>
Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@...el.com>
---
arch/x86/kernel/cpu/mce/dev-mcelog.c | 11 ++---------
1 file changed, 2 insertions(+), 9 deletions(-)
diff --git a/arch/x86/kernel/cpu/mce/dev-mcelog.c b/arch/x86/kernel/cpu/mce/dev-mcelog.c
index af44fd5dbd7c..8d023239ce18 100644
--- a/arch/x86/kernel/cpu/mce/dev-mcelog.c
+++ b/arch/x86/kernel/cpu/mce/dev-mcelog.c
@@ -264,15 +264,8 @@ static long mce_chrdev_ioctl(struct file *f, unsigned int cmd,
return put_user(sizeof(struct mce), p);
case MCE_GET_LOG_LEN:
return put_user(mcelog->len, p);
- case MCE_GETCLEAR_FLAGS: {
- unsigned flags;
-
- do {
- flags = mcelog->flags;
- } while (cmpxchg(&mcelog->flags, flags, 0) != flags);
-
- return put_user(flags, p);
- }
+ case MCE_GETCLEAR_FLAGS:
+ return put_user(xchg(&mcelog->flags, 0), p);
default:
return -ENOTTY;
}
--
2.17.1
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