linux-kernel - Suspicious compilation warning

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Date:	Mon, 19 Apr 2010 20:27:43 -0300
From:	Marcelo Jimenez <mroberto@...i.cetuc.puc-rio.br>
To:	linux-arm-kernel@...ts.infradead.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>,
	Minchan Kim <minchan.kim@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>, Yinghai Lu <yinghai@...nel.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Suspicious compilation warning

Hi,

I get this warning while compiling for ARM/SA1100:

mm/sparse.c: In function '__section_nr':
mm/sparse.c:135: warning: 'root' is used uninitialized in this function

With a small patch in fs/proc/meminfo.c, I find that NR_SECTION_ROOTS
is zero, which certainly explains the warning.

# cat /proc/meminfo
NR_SECTION_ROOTS=0
NR_MEM_SECTIONS=32
SECTIONS_PER_ROOT=512
SECTIONS_SHIFT=5
MAX_PHYSMEM_BITS=32
SECTION_SIZE_BITS=27
MemTotal:          28848 kB
MemFree:           15516 kB
Buffers:             112 kB
Cached:             2312 kB
SwapCached:            0 kB
Active:              984 kB
Inactive:           1628 kB
Active(anon):        188 kB
Inactive(anon):        0 kB
Active(file):        796 kB
Inactive(file):     1628 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:             0 kB
SwapFree:              0 kB
Dirty:                24 kB
Writeback:             0 kB
AnonPages:           208 kB
Mapped:              292 kB
Shmem:                 0 kB
Slab:               1472 kB
SReclaimable:        744 kB
SUnreclaim:          728 kB
KernelStack:         200 kB
PageTables:           32 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:       14424 kB
Committed_AS:        772 kB
VmallocTotal:     614400 kB
VmallocUsed:       33316 kB
VmallocChunk:     573436 kB

Regards,
Marcelo.
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