Hi David, After merging the btrfs-kdave tree, today's linux-next build (powerpc ppc64_defconfig) produced this warning:
In file included from include/linux/string.h:6,
from arch/powerpc/include/asm/paca.h:19,
from arch/powerpc/include/asm/current.h:16,
from include/linux/sched.h:12,
from fs/btrfs/volumes.c:6:
fs/btrfs/volumes.h: In function 'btrfs_op':
include/linux/compiler.h:77:22: warning: this statement may fall through
[-Wimplicit-fallthrough=]
# define unlikely(x) __builtin_expect(!!(x), 0)
^~~~~~~~~~~~~~~~~~~~~~~~~~
include/asm-generic/bug.h:72:2: note: in expansion of macro 'unlikely'
unlikely(__ret_warn_on); \
^~~~~~~~
fs/btrfs/volumes.h:395:3: note: in expansion of macro 'WARN_ON_ONCE'
WARN_ON_ONCE(1);
^~~~~~~~~~~~
In file included from fs/btrfs/volumes.c:22:
fs/btrfs/volumes.h:396:2: note: here
case REQ_OP_READ:
^~~~
Introduced by commit
cf8cddd38bab3 ("btrfs: don't abuse REQ_OP_* flags for btrfs_map_block")
exposed by my new use of -Wimplicit-fallthrough
I am not sure why this has only turned up now (as opposed to earlier
today).
--
Cheers,
Stephen Rothwell
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