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From: Marcelo Roberto Jimenez on 5 May 2010 17:10
Got this while compiling for ARM/SA1100:

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

This patch follows Russell King's suggestion for a new calculation for
NR_SECTION_ROOTS. Thanks also to Sergei Shtylyov for pointing out the
existence of the macro DIV_ROUND_UP.

Signed-off-by: Marcelo Roberto Jimenez <mroberto(a)cpti.cetuc.puc-rio.br>
---
include/linux/mmzone.h | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index cf9e458..e90ad64 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -972,7 +972,7 @@ struct mem_section {
#endif

#define SECTION_NR_TO_ROOT(sec) ((sec) / SECTIONS_PER_ROOT)
-#define NR_SECTION_ROOTS (NR_MEM_SECTIONS / SECTIONS_PER_ROOT)
+#define NR_SECTION_ROOTS DIV_ROUND_UP(NR_MEM_SECTIONS, SECTIONS_PER_ROOT)
#define SECTION_ROOT_MASK (SECTIONS_PER_ROOT - 1)

#ifdef CONFIG_SPARSEMEM_EXTREME
--
1.7.1

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Prev: [PATCH linux-next] irq: Clear CPU mask in affinity_hint when none is provided
Next: fat: convert to unlocked_ioctl