[PATCH] btrfs: Fix compilation on big endian systems

[Marek Behún]

On Thu,  7 Apr 2022 14:51:03 +0200
Pali Rohár <pali at kernel.org> 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: Marek Behún <marek.behun at nic.cz>