Le 17/05/2026 à 15:54, David Laight a écrit :
On Sun, 17 May 2026 12:14:21 +0800
Mingcong Bai <[email protected]> wrote:
Similar to commit b929926f01f2 ("sh: define __BIG_ENDIAN for math-emu"),
define __LITTLE_ENDIAN and __BIG_ENDIAN as 0 to mitigate build-time
warnings:
./include/math-emu/double.h:59:21: error: ‘__BIG_ENDIAN’ is not defined,
evaluates to ‘0’ [-Werror=undef]
59 | #if __BYTE_ORDER == __BIG_ENDIAN
|
Cc: [email protected]
Fixes: 13da9e200fe4 ("Revert "endian: #define __BYTE_ORDER"")
Reported-by: kernel test robot <[email protected]>
Closes:
https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flore.kernel.org%2Foe-kbuild-all%2F202507301656.7FEX6J5W-lkp%40intel.com%2F&data=05%7C02%7Cchristophe.leroy%40csgroup.eu%7C08977974fb1c495e9bd508deb41bd275%7C8b87af7d86474dc78df45f69a2011bb5%7C0%7C0%7C639146228768693730%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=4qGulR%2BL7i7inksEbEH9jNGZS8HG80uvm3I9IyYzZww%3D&reserved=0
Signed-off-by: Mingcong Bai <[email protected]>
---
arch/powerpc/include/asm/sfp-machine.h | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/include/asm/sfp-machine.h
b/arch/powerpc/include/asm/sfp-machine.h
index 8b957aabb826d..db8525605c026 100644
--- a/arch/powerpc/include/asm/sfp-machine.h
+++ b/arch/powerpc/include/asm/sfp-machine.h
@@ -319,10 +319,12 @@
#define abort()
\
return 0
-#ifdef __BIG_ENDIAN
+#ifdef __BIG_ENDIAN__
#define __BYTE_ORDER __BIG_ENDIAN
+#define __LITTLE_ENDIAN 0
#else
#define __BYTE_ORDER __LITTLE_ENDIAN
+#define __BIG_ENDIAN 0
#endif
I thought the expected/correct value for __BYTE_ORDER__ was either 1234 or 4321.
(apart from pdp11's 2143).
That's the case, in include/linux/kconfig.h we have:
#ifdef CONFIG_CPU_BIG_ENDIAN
#define __BIG_ENDIAN 4321
#else
#define __LITTLE_ENDIAN 1234
#endif
But as far as I understand the problem is that math-emu expects
__BIG_ENDIAN to be defined at all time as it has tests like:
#if __BYTE_ORDER == __BIG_ENDIAN
Christophe
