This is a note to let you know that I've just added the patch titled
compiler.h: Introduce absolute_pointer macro
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
compiler.h-introduce-absolute_pointer-macro.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 30c9fe53039de1c7291d290c0b24906101579e79
Author: Guenter Roeck <linux@xxxxxxxxxxxx>
Date: Tue Sep 14 20:52:24 2021 -0700
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 <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Reviewed-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
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) \
