From: Randy Dunlap <rdunlap@infradead.org>
To: linux-kernel@vger.kernel.org
Cc: Randy Dunlap <rdunlap@infradead.org>,
Yoshinori Sato <ysato@users.sourceforge.jp>,
Rich Felker <dalias@libc.org>,
linux-sh@vger.kernel.org, David Howells <dhowells@redhat.com>
Subject: [PATCH 1/4] sh: convert xchg() to a statement expression
Date: Wed, 2 Jun 2021 16:14:41 -0700 [thread overview]
Message-ID: <20210602231443.4670-2-rdunlap@infradead.org> (raw)
In-Reply-To: <20210602231443.4670-1-rdunlap@infradead.org>
Use a GCC statement expression (extension) for xchg(), as is done
in other arches.
Fixes this build warning:
../fs/ocfs2/file.c: In function 'ocfs2_file_write_iter':
../arch/sh/include/asm/cmpxchg.h:49:3: warning: value computed is not used [-Wunused-value]
49 | ((__typeof__(*(ptr)))__xchg((ptr),(unsigned long)(x), sizeof(*(ptr))))
Fixes: e839ca528718 ("Disintegrate asm/system.h for SH")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Rich Felker <dalias@libc.org>
Cc: linux-sh@vger.kernel.org
Cc: David Howells <dhowells@redhat.com>
---
This is similar to a patch from Arnd for m68k:
https://lore.kernel.org/linux-m68k/20201008123429.1133896-1-arnd@arndb.de/
arch/sh/include/asm/cmpxchg.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- linux-next-20210528.orig/arch/sh/include/asm/cmpxchg.h
+++ linux-next-20210528/arch/sh/include/asm/cmpxchg.h
@@ -46,7 +46,7 @@ extern void __xchg_called_with_bad_point
})
#define xchg(ptr,x) \
- ((__typeof__(*(ptr)))__xchg((ptr),(unsigned long)(x), sizeof(*(ptr))))
+ ({(__typeof__(*(ptr)))__xchg((ptr),(unsigned long)(x), sizeof(*(ptr)));})
/* This function doesn't exist, so you'll get a linker error
* if something tries to do an invalid cmpxchg(). */
next prev parent reply other threads:[~2021-06-02 23:14 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-02 23:14 [PATCH 0/3] sh: fixes for various build warnings Randy Dunlap
2021-06-02 23:14 ` Randy Dunlap [this message]
2021-06-02 23:14 ` [RFC PATCH 3/4] sh: define __BIG_ENDIAN for math-emu Randy Dunlap
2021-06-03 7:54 ` Geert Uytterhoeven
2021-06-03 23:19 ` Randy Dunlap
2021-06-04 7:24 ` Geert Uytterhoeven
2021-06-02 23:14 ` [PATCH 4/4] sh: fix READ/WRITE redefinition warnings Randy Dunlap
2021-06-03 6:51 ` [PATCH 0/3] sh: fixes for various build warnings John Paul Adrian Glaubitz
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