Gitweb: http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=786b32...
Commit: 786b32f892dc341b607445bdef29d8e41a840925
Parent: 15e09c0ecaab4a1b4a7ed69db536c38948b92279
Author: Julia Lawall <julia@diku.dk>
AuthorDate: Sun Nov 23 00:48:56 2008 +0000
Committer: Paul Mackerras <paulus@samba.org>
CommitDate: Wed Dec 3 20:46:36 2008 +1100
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>
---
arch/powerpc/kernel/setup_64.c | 2 --
1 files changed, 0 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index 169d74c..93c875a 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -606,8 +606,6 @@ void __init setup_per_cpu_areas(void)
for_each_possible_cpu(i) {
ptr = alloc_bootmem_pages_node(NODE_DATA(cpu_to_node(i)), size);
- if (!ptr)
- panic("Cannot allocate cpu data for CPU %d\n", i);
paca[i].data_offset = ptr - __per_cpu_start;
memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
--
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