[PATCH v2 0/1] lib: Remove dead code

[PATCH v2 0/1] lib: Remove dead code

[Ariel Otilibili]

Hello,

This patch removes a dead code in lib/inflate.c; it follows from a discussion
in Xen.

The dead code is tracked by Coverity-ID 1055253 in Xen, was triggered by a file
taken unmodified from Linux.

Thank you,

Link: https://lore.kernel.org/all/7587b503-b2ca-4476-8dc9-e9683d4ca5f0@suse.com/
--
v2:
* Cc stable

Ariel Otilibili (1):
  lib: Remove dead code

 lib/inflate.c | 2 --
 1 file changed, 2 deletions(-)

-- 
2.47.1

[PATCH v2 1/1] lib: Remove dead code

[Ariel Otilibili]

This is a follow up from a discussion in Xen:

The if-statement tests `res` is non-zero; meaning the case zero is never reached.

Link: https://lore.kernel.org/all/7587b503-b2ca-4476-8dc9-e9683d4ca5f0@suse.com/
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Suggested-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Ariel Otilibili <ariel.otilibili-anieli@eurecom.fr>
--
Cc: stable@vger.kernel.org
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Anthony PERARD <anthony.perard@vates.tech>
Cc: Michal Orzel <michal.orzel@amd.com>
Cc: Julien Grall <julien@xen.org>
Cc: =?utf-8?q?Roger_Pau_Monn=C3=A9?= <roger.pau@citrix.com>
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: xen-devel@lists.xenproject.org
---
 lib/inflate.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/lib/inflate.c b/lib/inflate.c
index fbaf03c1748d..eab886baa1b4 100644
--- a/lib/inflate.c
+++ b/lib/inflate.c
@@ -1257,8 +1257,6 @@ static int INIT gunzip(void)
     /* Decompress */
     if ((res = inflate())) {
 	    switch (res) {
-	    case 0:
-		    break;
 	    case 1:
 		    error("invalid compressed format (err=1)");
 		    break;
-- 
2.47.1

Re: [PATCH v2 1/1] lib: Remove dead code

[Greg KH]

On Thu, Dec 19, 2024 at 11:45:01PM +0100, Ariel Otilibili wrote:
> This is a follow up from a discussion in Xen:
> 
> The if-statement tests `res` is non-zero; meaning the case zero is never reached.
> 
> Link: https://lore.kernel.org/all/7587b503-b2ca-4476-8dc9-e9683d4ca5f0@suse.com/
> Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
> Suggested-by: Jan Beulich <jbeulich@suse.com>
> Signed-off-by: Ariel Otilibili <ariel.otilibili-anieli@eurecom.fr>
> --
> Cc: stable@vger.kernel.org

Why is "removing dead code" a stable kernel thing?

confused,

greg k-h

Re: [PATCH v2 1/1] lib: Remove dead code

[Ariel Otilibili-Anieli]

On Friday, December 20, 2024 08:09 CET, Greg KH <gregkh@linuxfoundation.org> wrote:

> On Thu, Dec 19, 2024 at 11:45:01PM +0100, Ariel Otilibili wrote:
> > This is a follow up from a discussion in Xen:
> > 
> > The if-statement tests `res` is non-zero; meaning the case zero is never reached.
> > 
> > Link: https://lore.kernel.org/all/7587b503-b2ca-4476-8dc9-e9683d4ca5f0@suse.com/
> > Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
> > Suggested-by: Jan Beulich <jbeulich@suse.com>
> > Signed-off-by: Ariel Otilibili <ariel.otilibili-anieli@eurecom.fr>
> > --
> > Cc: stable@vger.kernel.org
> 
> Why is "removing dead code" a stable kernel thing?

Hello Greg,

It is what I understood from the process:

"Attaching a Fixes: tag does not subvert the stable kernel rules process nor the requirement to Cc: stable@vger.kernel.org on all stable patch candidates." [1]

Does my understanding make sense?

Regards,
Ariel

[1] https://docs.kernel.org/process/submitting-patches.html

> 
> confused,
> 
> greg k-h

Re: [PATCH v2 1/1] lib: Remove dead code

[Greg KH]

On Fri, Dec 20, 2024 at 09:44:31AM +0100, Ariel Otilibili-Anieli wrote:
> On Friday, December 20, 2024 08:09 CET, Greg KH <gregkh@linuxfoundation.org> wrote:
> 
> > On Thu, Dec 19, 2024 at 11:45:01PM +0100, Ariel Otilibili wrote:
> > > This is a follow up from a discussion in Xen:
> > > 
> > > The if-statement tests `res` is non-zero; meaning the case zero is never reached.
> > > 
> > > Link: https://lore.kernel.org/all/7587b503-b2ca-4476-8dc9-e9683d4ca5f0@suse.com/
> > > Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
> > > Suggested-by: Jan Beulich <jbeulich@suse.com>
> > > Signed-off-by: Ariel Otilibili <ariel.otilibili-anieli@eurecom.fr>
> > > --
> > > Cc: stable@vger.kernel.org
> > 
> > Why is "removing dead code" a stable kernel thing?
> 
> Hello Greg,
> 
> It is what I understood from the process:
> 
> "Attaching a Fixes: tag does not subvert the stable kernel rules process nor the requirement to Cc: stable@vger.kernel.org on all stable patch candidates." [1]
> 
> Does my understanding make sense?

I'm confused, what are you expecting to happen here?  Why is this even
marked as a "fix"?

> [1] https://docs.kernel.org/process/submitting-patches.html

Please read:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html

for the stable kernel rules.

Again, you have a "cc: stable@..." in your patch, why?

thanks,

greg k-h