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786b32f892
linux/arch/powerpc
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Julia Lawall 786b32f892 powerpc: Eliminate NULL test and memset after alloc_bootmem 
As noted by Akinobu Mita in commit b1fceac2 ("x86: remove unnecessary
memset and NULL check after alloc_bootmem()"), alloc_bootmem and
related functions never return NULL and always return a zeroed region
of memory.  Thus a NULL test or memset after calls to these functions
is unnecessary.

This was fixed using the following semantic patch.
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@@
expression E;
statement S;
@@

E = \(alloc_bootmem\|alloc_bootmem_low\|alloc_bootmem_pages\|alloc_bootmem_low_pages\|alloc_bootmem_node\|alloc_bootmem_low_pages_node\|alloc_bootmem_pages_node\)(...)
... when != E
(
- BUG_ON (E == NULL);
|
- if (E == NULL) S
)

@@
expression E,E1;
@@

E = \(alloc_bootmem\|alloc_bootmem_low\|alloc_bootmem_pages\|alloc_bootmem_low_pages\|alloc_bootmem_node\|alloc_bootmem_low_pages_node\|alloc_bootmem_pages_node\)(...)
... when != E
- memset(E,0,E1);
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Paul Mackerras <paulus@samba.org>
2008-12-03 20:46:36 +11:00
..
boot Merge branch 'merge' 2008-12-03 20:11:06 +11:00
configs Merge branch 'merge' of git://git.secretlab.ca/git/linux-2.6-mpc52xx into merge 2008-11-24 11:53:44 +11:00
include/asm powerpc: Add sync_*_for_* to dma_ops 2008-12-03 20:46:36 +11:00
kernel powerpc: Eliminate NULL test and memset after alloc_bootmem 2008-12-03 20:46:36 +11:00
kvm KVM: ppc: stop leaking host memory on VM exit 2008-11-25 12:02:48 +02:00
lib powerpc: Update 64bit __copy_tofrom_user() using CPU_FTR_UNALIGNED_LD_STD 2008-11-19 16:04:54 +11:00
math-emu powerpc/math-emu: Use kernel generic math-emu code 2008-10-01 08:40:07 -05:00
mm powerpc: Use RCU based pte freeing mechanism for all powerpc 2008-12-03 20:46:35 +11:00
oprofile powerpc/cell/OProfile: Fix on-stack array size in activate spu profiling function 2008-10-31 16:13:51 +11:00
platforms Merge branch 'merge' 2008-12-03 20:11:06 +11:00
sysdev Merge branch 'merge' 2008-12-03 20:11:06 +11:00
xmon powerpc: Fix compile errors with CONFIG_BUG=n 2008-10-31 21:34:09 +11:00
Kconfig powerpc: Add sync_*_for_* to dma_ops 2008-12-03 20:46:36 +11:00
Kconfig.debug powerpc: Allow the max stack trace depth to be configured 2008-12-03 20:46:35 +11:00
Makefile ftrace: rename FTRACE to FUNCTION_TRACER 2008-10-20 18:27:03 +02:00