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Date: Sun, 12 Sep 2021 09:01:46 -0700 From: Guenter Roeck <linux@...ck-us.net> To: Linus Torvalds <torvalds@...ux-foundation.org> Cc: Richard Henderson <rth@...ddle.net>, Ivan Kokshaysky <ink@...assic.park.msu.ru>, Matt Turner <mattst88@...il.com>, "James E . J . Bottomley" <James.Bottomley@...senPartnership.com>, Helge Deller <deller@....de>, "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, linux-alpha@...r.kernel.org, Geert Uytterhoeven <geert@...ux-m68k.org>, linux-kernel@...r.kernel.org, linux-parisc@...r.kernel.org, netdev@...r.kernel.org, linux-sparse@...r.kernel.org, Guenter Roeck <linux@...ck-us.net> Subject: [PATCH 1/4] compiler.h: Introduce absolute_pointer macro 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> --- include/linux/compiler.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/include/linux/compiler.h b/include/linux/compiler.h index b67261a1e3e9..3d5af56337bd 100644 --- a/include/linux/compiler.h +++ b/include/linux/compiler.h @@ -188,6 +188,8 @@ 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) \ -- 2.33.0
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