linux-kernel - Re: [PATCH] watchdog: set variables watchdog_soft,hardlockup_user_enabled storage-class-specifier to static

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Message-ID: <CAD=FV=V_i5wR4oNy+xarA9e=VcgpH6i3U1uxFKtsaOe5AQX=Zw@mail.gmail.com>
Date:   Wed, 24 May 2023 11:05:15 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Tom Rix <trix@...hat.com>
Cc:     akpm@...ux-foundation.org, pmladek@...e.com, kernelfans@...il.com,
        lecopzer.chen@...iatek.com, ldufour@...ux.ibm.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] watchdog: set variables watchdog_soft,hardlockup_user_enabled
 storage-class-specifier to static

Hi,

On Tue, May 23, 2023 at 7:12 AM Doug Anderson <dianders@...omium.org> wrote:
>
> Hi,
>
> On Tue, May 23, 2023 at 5:23 AM Tom Rix <trix@...hat.com> wrote:
> >
> > smatch reports
> > kernel/watchdog.c:40:19: warning: symbol
> >   'watchdog_hardlockup_user_enabled' was not declared. Should it be static?
> > kernel/watchdog.c:41:19: warning: symbol
> >   'watchdog_softlockup_user_enabled' was not declared. Should it be static?
> >
> > These variabled are only used in their defining file, so it should be static.
>
> s/variabled/variables
>
> >
> > Signed-off-by: Tom Rix <trix@...hat.com>
> > ---
> >  kernel/watchdog.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
>
> While your fix is valid (thanks!), it's only half the fix.
>
> I wondered why smatch would have suddenly noticed this since the
> change that touched this variable recently was only a rename. When I
> dug deeper, I realized that the old names actually _were_ referenced
> outside this file and my rename missed them. The reason I missed them
> is that the only reference is an "extern" reference in
> `include/linux/nmi.h`. The references in `include/linux/nmi.h`
> probably should have been removed in commit dd0693fdf054 ("watchdog:
> move watchdog sysctl interface to watchdog.c")
>
> ...so a more complete fix would also remove references to the old
> names (nmi_watchdog_user_enabled and soft_watchdog_user_enabled) in
> `include/linux/nmi.h`.

FWIW, Petr has the other half of the fix at:

https://lore.kernel.org/r/ZG4TW--j-DdSsUO6@alley

Any chance you could send out a v2 and include that? If I don't see
something by tomorrow morning I'll try to send out a v2 for you that
squashes your and his changes.

-Doug