From b0cfe12c4d4b8b4ef335cdf4ddefcbdcd1b70d58 Mon Sep 17 00:00:00 2001 From: David Sterba Date: Thu, 13 Jan 2022 14:47:08 +0100 Subject: [PATCH] btrfs-progs: kerncompat: add local definition for alignment macros There's still problem left with compilation on musl and kernel < 5.11, because __ALIGN_KERNEL is not defined anymore: ../bin/ld: kernel-shared/volumes.o: in function `create_chunk': volumes.c:(.text+0x17f8): undefined reference to `__ALIGN_KERNEL' Due to the entangled includes and unconditional definition of __ALIGN_KERNEL, we can't use #ifdef in kerncompat.h to define it eventually (as kerncompat.h is the first include). Instead add local definitions of the macros and rename them to avoid name clashes. Pull-request: #433 Signed-off-by: David Sterba [Retrieved from: https://github.com/kdave/btrfs-progs/commit/b0cfe12c4d4b8b4ef335cdf4ddefcbdcd1b70d58] Signed-off-by: Fabrice Fontaine --- kerncompat.h | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/kerncompat.h b/kerncompat.h index 6ca1526e2..f0a6e196e 100644 --- a/kerncompat.h +++ b/kerncompat.h @@ -359,7 +359,14 @@ do { \ /* Alignment check */ #define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0) -#define ALIGN(x, a) __ALIGN_KERNEL((x), (a)) + +/* + * Alignment, copied and renamed from /usr/include/linux/const.h to work around + * issues caused by moving the definition in 5.12 + */ +#define __ALIGN_KERNEL__(x, a) __ALIGN_KERNEL_MASK__(x, (typeof(x))(a) - 1) +#define __ALIGN_KERNEL_MASK__(x, mask) (((x) + (mask)) & ~(mask)) +#define ALIGN(x, a) __ALIGN_KERNEL__((x), (a)) static inline int is_power_of_2(unsigned long n) {