[dm-devel] [dm:for-next 2/3] drivers/md/dm-mpath.c:821:37: error: passing argument 1 of 'strcmp' from incompatible pointer type

[Mike Snitzer]

On Mon, Sep 17 2018 at 12:16pm -0400,
kbuild test robot <lkp at intel.com> wrote:

> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm.git for-next
> head:   9c01fc7e4f3b269a5550014c16ba2fa15b90fc45
> commit: 560e9814d061de1dce3328630846025d653dea7d [2/3] dm mpath: fix attached_handler_name leak and dangling hw_handler_name pointer
> config: x86_64-randconfig-x019-201837 (attached as .config)
> compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
> reproduce:
>         git checkout 560e9814d061de1dce3328630846025d653dea7d
>         # save the attached .config to linux build tree
>         make ARCH=x86_64 
> 
> All error/warnings (new ones prefixed by >>):
> 
>    drivers/md/dm-mpath.c: In function 'setup_scsi_dh':
> >> drivers/md/dm-mpath.c:821:37: error: passing argument 1 of 'strcmp' from incompatible pointer type [-Werror=incompatible-pointer-types]
>        if (m->hw_handler_name && strcmp(attached_handler_name, m->hw_handler_name)) {
>                                         ^~~~~~~~~~~~~~~~~~~~~
>    In file included from include/linux/bitmap.h:9:0,
>                     from include/linux/cpumask.h:12,
>                     from arch/x86/include/asm/cpumask.h:5,
>                     from arch/x86/include/asm/msr.h:11,
>                     from arch/x86/include/asm/processor.h:21,
>                     from arch/x86/include/asm/cpufeature.h:5,
>                     from arch/x86/include/asm/thread_info.h:53,
>                     from include/linux/thread_info.h:38,
>                     from arch/x86/include/asm/preempt.h:7,
>                     from include/linux/preempt.h:81,
>                     from include/linux/spinlock.h:51,
>                     from include/linux/wait.h:9,
>                     from include/linux/wait_bit.h:8,
>                     from include/linux/fs.h:6,
>                     from include/linux/highmem.h:5,
>                     from include/linux/bio.h:21,
>                     from include/linux/device-mapper.h:11,
>                     from drivers/md/dm-mpath.c:8:
>    include/linux/string.h:44:12: note: expected 'const char *' but argument is of type 'char **'
>     extern int strcmp(const char *,const char *);
>                ^~~~~~
>    drivers/md/dm-mpath.c: In function 'parse_path':
> >> drivers/md/dm-mpath.c:891:24: warning: assignment discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
>      attached_handler_name = scsi_dh_attached_handler_name(q, GFP_KERNEL);
>                            ^
>    cc1: some warnings being treated as errors
> 
> vim +/strcmp +821 drivers/md/dm-mpath.c

Fixed, sorry for the noise.