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

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Message-ID: <Y+FrLt8gt/Pff/zZ@redhat.com>
Date:   Mon, 6 Feb 2023 16:03:42 -0500
From:   Mike Snitzer <snitzer@...nel.org>
To:     Sergey Shtylyov <s.shtylyov@....ru>
Cc:     Mikulas Patocka <mpatocka@...hat.com>,
        Alasdair Kergon <agk@...hat.com>, dm-devel@...hat.com,
        lvc-patches@...uxtesting.org, linux-kernel@...r.kernel.org
Subject: Re: md: dm-ioctl: drop always-false condition

On Mon, Feb 06 2023 at  3:58P -0500,
Sergey Shtylyov <s.shtylyov@....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@....ru>
> > 
> > Reviewed-by: Mikulas Patocka <mpatocka@...hat.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.

See:
https://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm.git/commit/?h=dm-6.3&id=151d812251202aa0dce1fdeabd64794292d40b75