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 <[email protected]> Signed-off-by: Guenter Roeck <[email protected]> Reviewed-by: Geert Uytterhoeven <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
zandrey · Sep 15, 2021 · f6b5f1a · f6b5f1a
1 parent 6880fa6
commit f6b5f1a
Showing 1 changed file with 2 additions and 0 deletions.
diff --git 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)						\