From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Guenter Roeck <linux@roeck-us.net>,
Linus Torvalds <torvalds@linux-foundation.org>,
Geert Uytterhoeven <geert@linux-m68k.org>,
Sasha Levin <sashal@kernel.org>,
luc.vanoostenryck@gmail.com, linux-sparse@vger.kernel.org
Subject: [PATCH AUTOSEL 5.4 11/19] compiler.h: Introduce absolute_pointer macro
Date: Wed, 22 Sep 2021 23:38:45 -0400 [thread overview]
Message-ID: <20210923033853.1421193-11-sashal@kernel.org> (raw)
In-Reply-To: <20210923033853.1421193-1-sashal@kernel.org>
From: Guenter Roeck <linux@roeck-us.net>
[ Upstream commit f6b5f1a56987de837f8e25cd560847106b8632a8 ]
absolute_pointer() disassociates a pointer from its originating symbol
type and context. Use it to prevent compiler warnings/errors such as
drivers/net/ethernet/i825xx/82596.c: In function 'i82596_probe':
arch/m68k/include/asm/string.h:72:25: error:
'__builtin_memcpy' reading 6 bytes from a region of size 0 [-Werror=stringop-overread]
Such warnings may be reported by gcc 11.x for string and memory
operations on fixed addresses.
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
include/linux/compiler.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index 9446e8fbe55c..bce983406aaf 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -233,6 +233,8 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
(typeof(ptr)) (__ptr + (off)); })
#endif
+#define absolute_pointer(val) RELOC_HIDE((void *)(val), 0)
+
#ifndef OPTIMIZER_HIDE_VAR
/* Make the optimizer believe the variable can be manipulated arbitrarily. */
#define OPTIMIZER_HIDE_VAR(var) \
--
2.30.2
parent reply other threads:[~2021-09-23 3:40 UTC|newest]
Thread overview: expand[flat|nested] mbox.gz Atom feed
[parent not found: <20210923033853.1421193-1-sashal@kernel.org>]
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