From: Guenter Roeck Date: Wed, 15 Sep 2021 03:52:24 +0000 (-0700) Subject: compiler.h: Introduce absolute_pointer macro X-Git-Tag: v4.4.286~27 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=17ac1cd493e0f7c4347513126b886d7f40e3f262;p=thirdparty%2Fkernel%2Fstable.git compiler.h: Introduce absolute_pointer macro [ 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 Signed-off-by: Guenter Roeck Reviewed-by: Geert Uytterhoeven Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin --- diff --git a/include/linux/compiler.h b/include/linux/compiler.h index 7cabe0cc86651..bc8077e5e688e 100644 --- a/include/linux/compiler.h +++ b/include/linux/compiler.h @@ -208,6 +208,8 @@ void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect); (typeof(ptr)) (__ptr + (off)); }) #endif +#define absolute_pointer(val) RELOC_HIDE((void *)(val), 0) + #ifndef OPTIMIZER_HIDE_VAR #define OPTIMIZER_HIDE_VAR(var) barrier() #endif