Re: md: dm-ioctl: drop always-false condition

Mike Snitzer
2023-02-06T21:04:35Z

On Mon, Feb 06 2023 at 3:58P -0500,
Sergey Shtylyov <s.shtylyov@omp.ru> wrote:

> On 1/18/23 2:59 PM, Mikulas Patocka wrote:
>
> [...]
>
> >> The expression 'indata[3] > ULONG_MAX' always evaluates to false since
> >> indata[] is declared as an array of *unsigned long* elements and #define
> >> ULONG_MAX represents the max value of that exact type...
> >>
> >> Note that gcc seems to be able to detect the dead code here and eliminate
> >> this check anyway...
> >>
> >> Found by Linux Verification Center (linuxtesting.org) with the SVACE static
> >> analysis tool.
> >>
> >> Signed-off-by: Sergey Shtylyov <s.shtylyov@omp.ru>
> >
> > Reviewed-by: Mikulas Patocka <mpatocka@redhat.com>
>
> Thank you!
>
> >> ---
> >> This patch is atop of the 'for-next' branch of the device-mapper repo...
> >>
> >> drivers/md/dm-ioctl.c | 3 +--
> >> 1 file changed, 1 insertion(+), 2 deletions(-)
> >>
> >> Index: linux-dm/drivers/md/dm-ioctl.c
> >> ===================================================================
> >> --- linux-dm.orig/drivers/md/dm-ioctl.c
> >> +++ linux-dm/drivers/md/dm-ioctl.c
> >> @@ -1073,8 +1073,7 @@ static int dev_set_geometry(struct file
>
> Returning to this patch, I think I should've added the name of the function
> in question in both the subject and and commit msg... I'll recast...

Not a big deal, I've already staged it so please don't resend.