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https://github.com/kdave/btrfs-progs/commit/b0cfe12c4d4b8b4ef335cdf4ddefcbdcd1b70d58.patch
https://bugs.gentoo.org/831817
From b0cfe12c4d4b8b4ef335cdf4ddefcbdcd1b70d58 Mon Sep 17 00:00:00 2001
From: David Sterba <dsterba@suse.com>
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 <dsterba@suse.com>
--- 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)
{
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