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authorJulia Lawall <julia@diku.dk>2008-11-23 00:48:56 +0000
committerPaul Mackerras <paulus@samba.org>2008-12-03 20:46:36 +1100
commit786b32f892dc341b607445bdef29d8e41a840925 (patch)
treec44b4e665a92d04f4e28a06fed46d7d3fdd57efc
parent15e09c0ecaab4a1b4a7ed69db536c38948b92279 (diff)
downloadop-kernel-dev-786b32f892dc341b607445bdef29d8e41a840925.zip
op-kernel-dev-786b32f892dc341b607445bdef29d8e41a840925.tar.gz
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>
-rw-r--r--arch/powerpc/kernel/setup_64.c2
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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