linux-kernel - linux-next: build warning after merge of the btrfs-kdave tree

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20181126110629.45969c51@canb.auug.org.au>
Date:   Mon, 26 Nov 2018 11:06:29 +1100
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     David Sterba <dsterba@...e.cz>, Kees Cook <keescook@...gle.com>
Cc:     Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Christoph Hellwig <hch@....de>
Subject: linux-next: build warning after merge of the btrfs-kdave tree

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

Content of type "application/pgp-signature" skipped