Re: [PATCH] net/core/sysctl_net_core.c unused variable

On 06/09/15 16:51, Joe Perches wrote:

On Sun, 2015-09-06 at 16:36 +0100, Nick Warne wrote:

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On 06/09/15 16:28, Joe Perches wrote:

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On Sun, 2015-09-06 at 16:16 +0100, Nick Warne wrote:

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On 06/09/15 15:52, Joe Perches wrote:

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On Sun, 2015-09-06 at 15:13 +0100, Nick Warne wrote:

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gcc version 4.8.2 (GCC) warns that 'static int one = 1;' is declared but
not used in file net/core/sysctl_net_core.c.

Only when CONFIG_NET isn't set.

CONFIG_NET=y

Peculiar indeed.

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Reading the file, that is
the case.  Attached is a patch to remove it.

$ git grep -w -n one net/core/sysctl_net_core.c
net/core/sysctl_net_core.c:26:static int one = 1;
net/core/sysctl_net_core.c:332:         .extra2         = &one

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Signed-off-by:  Nick Warne <redacted>

Please use grep to augment reading.

grep -w -n one net/core/sysctl_net_core.c
26:static int one = 1;

?

I just don't have the &one.

I am confused now.

What source tree are you using?

Latest longterm 3.18.21

OK, it's important to mention that otherwise the
assumption would be a git tree like net or net-next.

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What changes in what branch exist?

I am not using git (if that is what you mean by 'branches') - just
tarballs from kernel.org

(OK, using git and linux-stable)

$ git grep -w -n one v3.18.21 -- net/core/sysctl_net_core.c
v3.18.21:net/core/sysctl_net_core.c:26:static int one = 1;

And the responsible commit:

commit c48cf4f27d4555a455c3fef71137bd0fc44d1656
("net: sysctl_net_core: check SNDBUF and RCVBUF for min length")

Ah, OK. GCC was right - just the variable declaration was overlooked to be removed too.

http://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=c48cf4f27d4555a455c3fef71137bd0fc44d1656

My patch was right then (but wrong) :)

Thanks Joe,

Nick

-- 
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