[avr32] [next:akpm 212/227] lib/percpu-refcount.c:57: warning: valuecomputed is not used

From: Fengguang Wu
Date: Mon Jan 07 2013 - 21:26:01 EST

[CC avr32 maintainers]

On Mon, Jan 07, 2013 at 12:20:52PM -0800, Andrew Morton wrote:
> On Mon, 07 Jan 2013 12:45:36 +0800
> kbuild test robot <fengguang.wu@xxxxxxxxx> wrote:
> > tree: git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git akpm
> > head: e862d51dae9808e394a118ca1692f09bf0751aba
> > commit: 6311ac08e93b12f1367da092b413dd2434be45f5 [212/227] generic dynamic per cpu refcounting
> > config: make ARCH=avr32 atngw100_defconfig
> >
> > All warnings:
> >
> > lib/percpu-refcount.c: In function 'percpu_ref_init':
> > lib/percpu-refcount.c:22: error: 'jiffies' undeclared (first use in this function)
> > lib/percpu-refcount.c:22: error: (Each undeclared identifier is reported only once
> > lib/percpu-refcount.c:22: error: for each function it appears in.)
> > lib/percpu-refcount.c: In function 'percpu_ref_alloc':
> > lib/percpu-refcount.c:36: error: 'jiffies' undeclared (first use in this function)
> > lib/percpu-refcount.c:41: error: 'HZ' undeclared (first use in this function)
> > lib/percpu-refcount.c:57: warning: value computed is not used
> >
> Confused.
> http://ozlabs.org/~akpm/mmotm/broken-out/generic-dynamic-per-cpu-refcounting-fix.patch
> added the jiffies.h include.

Oh that patch's linux-next commit is 18bc58821de88e5621cfdaac78c814ea479accab
and goes _after_ the current commit 6311ac08e93b12f1367da092b413dd2434be45f5.

So linux-next HEAD no longer has the build errors, however I still got these

CC lib/percpu-refcount.o
In file included from /c/wfg/linux/include/uapi/linux/param.h:4,
from /c/wfg/linux/include/linux/timex.h:63,
from /c/wfg/linux/include/linux/jiffies.h:8,
from /c/wfg/linux/lib/percpu-refcount.c:4:
==> /c/wfg/linux/arch/avr32/include/asm/param.h:6:1: warning: "HZ" redefined

That's a trivial avr32 problem.

In file included from /c/wfg/linux/arch/avr32/include/asm/param.h:4,
from /c/wfg/linux/include/uapi/linux/param.h:4,
from /c/wfg/linux/include/linux/timex.h:63,
from /c/wfg/linux/include/linux/jiffies.h:8,
from /c/wfg/linux/lib/percpu-refcount.c:4:
/c/wfg/linux/arch/avr32/include/uapi/asm/param.h:6:1: warning: this is the location of the previous definition
/c/wfg/linux/lib/percpu-refcount.c: In function 'percpu_ref_alloc':
==> /c/wfg/linux/lib/percpu-refcount.c:58: warning: value computed is not used

That's perhaps related to how cmpxchg() is expanded in avr32.

/c/wfg/linux/lib/percpu-refcount.c: In function 'percpu_ref_kill':
==> /c/wfg/linux/lib/percpu-refcount.c:114: warning: 'new' may be used uninitialized in this function

Should be a false warning. The code looks fine.

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