[PATCH] btrfs: Fix compilation on big endian systems

[Qu Wenruo]

On 2022/4/7 20:51, Pali Rohár wrote:
> Fix following two compile errors on big endian systems:
>
>    CC      fs/btrfs/btrfs.o
> In file included from include/linux/byteorder/big_endian.h:107,
>                   from ./arch/powerpc/include/asm/byteorder.h:82,
>                   from ./arch/powerpc/include/asm/bitops.h:8,
>                   from include/linux/bitops.h:152,
>                   from include/uuid.h:9,
>                   from fs/btrfs/btrfs.c:10:
> fs/btrfs/conv-funcs.h: In function ‘btrfs_key_to_disk’:
> include/linux/byteorder/generic.h:90:21: error: ‘__cpu_to_le16’ undeclared (first use in this function); did you mean ‘__cpu_to_le16p’?
>   #define cpu_to_le16 __cpu_to_le16
>                       ^~~~~~~~~~~~~
> fs/btrfs/conv-funcs.h:79:10: note: in expansion of macro ‘cpu_to_le16’
>     __u16: cpu_to_le16,     \
>            ^~~~~~~~~~~
>
>    CC      fs/btrfs/compression.o
> In file included from ./arch/powerpc/include/asm/unaligned.h:9,
>                   from fs/btrfs/compression.c:16:
> include/linux/unaligned/access_ok.h:6:19: error: redefinition of ‘get_unaligned_le16’
>   static inline u16 get_unaligned_le16(const void *p)
>                     ^~~~~~~~~~~~~~~~~~
> In file included from fs/btrfs/ctree.h:16,
>                   from fs/btrfs/btrfs.h:12,
>                   from fs/btrfs/compression.c:8:
> include/linux/unaligned/le_byteshift.h:40:19: note: previous definition of ‘get_unaligned_le16’ was here
>   static inline u16 get_unaligned_le16(const void *p)
>                     ^~~~~~~~~~~~~~~~~~
>
> Include file asm/unaligned.h contains arch specific macros and functions
> for unaligned access as opposite to linux/unaligned le_byteshift.h which
> contains macros and functions specific to little endian systems only.
>
> Signed-off-by: Pali Rohár <pali at kernel.org>

Reviewed-by: Qu Wenruo <wqu at suse.com>

Thanks,
Qu
> ---
>   fs/btrfs/btrfs.h | 2 +-
>   fs/btrfs/ctree.h | 2 +-
>   2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/fs/btrfs/btrfs.h b/fs/btrfs/btrfs.h
> index 7d8b395b2646..a52587e0637a 100644
> --- a/fs/btrfs/btrfs.h
> +++ b/fs/btrfs/btrfs.h
> @@ -9,7 +9,7 @@
>   #define __BTRFS_BTRFS_H__
>
>   #include <linux/rbtree.h>
> -#include "conv-funcs.h"
> +#include "ctree.h"
>
>   extern struct btrfs_info btrfs_info;
>   extern struct btrfs_fs_info *current_fs_info;
> diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
> index 219c410b189f..55112318a330 100644
> --- a/fs/btrfs/ctree.h
> +++ b/fs/btrfs/ctree.h
> @@ -13,7 +13,7 @@
>   #include <compiler.h>
>   #include <linux/rbtree.h>
>   #include <linux/bug.h>
> -#include <linux/unaligned/le_byteshift.h>
> +#include <asm/unaligned.h>
>   #include <u-boot/crc.h>
>   #include "kernel-shared/btrfs_tree.h"
>   #include "crypto/hash.h"