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Date: Wed, 22 Sep 2021 23:39:21 -0400 From: Sasha Levin <sashal@...nel.org> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: Guenter Roeck <linux@...ck-us.net>, Linus Torvalds <torvalds@...ux-foundation.org>, Geert Uytterhoeven <geert@...ux-m68k.org>, Sasha Levin <sashal@...nel.org>, luc.vanoostenryck@...il.com, linux-sparse@...r.kernel.org Subject: [PATCH AUTOSEL 4.19 07/15] compiler.h: Introduce absolute_pointer macro From: Guenter Roeck <linux@...ck-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@...ux-foundation.org> Signed-off-by: Guenter Roeck <linux@...ck-us.net> Reviewed-by: Geert Uytterhoeven <geert@...ux-m68k.org> Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org> Signed-off-by: Sasha Levin <sashal@...nel.org> --- include/linux/compiler.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/include/linux/compiler.h b/include/linux/compiler.h index 6a53300cbd1e..ab9dfb14f486 100644 --- a/include/linux/compiler.h +++ b/include/linux/compiler.h @@ -228,6 +228,8 @@ 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
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