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authorJulia Lawall <julia@diku.dk>2008-07-14 11:59:13 +0400
committerHeiko Carstens <heiko.carstens@de.ibm.com>2008-07-14 12:02:15 +0400
commit3ca1c9907a352140bc83366511182b6ac776d8ee (patch)
treee4b502097f7eae5db457635bf807979515cc55ab /drivers/s390/char/sclp_con.c
parent402a3998ba6ba81bae6ac586ada55a0dd6a7c287 (diff)
downloadlinux-3ca1c9907a352140bc83366511182b6ac776d8ee.tar.xz
[S390] drivers/s390: Eliminate NULL test and memset after alloc_bootmem
As noted by Akinobu Mita in patch b1fceac2b9e04d278316b2faddf276015fc06e3b, 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. drivers/s390/char/raw3270.c | 11 +---------- drivers/s390/char/sclp_con.c | 2 -- 2 files changed, 1 insertion(+), 12 deletions(-) This was fixed using the following semantic patch. (http://www.emn.fr/x-info/coccinelle/) // <smpl> @@ expression E; statement S; @@ E = \(alloc_bootmem\|alloc_bootmem_low\|alloc_bootmem_pages\|alloc_bootmem_low_pages\)(...) ... when != E ( - BUG_ON (E == NULL); | - if (E == NULL) S ) @@ expression E,E1; @@ E = \(alloc_bootmem\|alloc_bootmem_low\|alloc_bootmem_pages\|alloc_bootmem_low_pages\)(...) ... when != E - memset(E,0,E1); // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/char/sclp_con.c')
-rw-r--r--drivers/s390/char/sclp_con.c2
1 files changed, 0 insertions, 2 deletions
diff --git a/drivers/s390/char/sclp_con.c b/drivers/s390/char/sclp_con.c
index ead1043d788e..23bb90a5ed29 100644
--- a/drivers/s390/char/sclp_con.c
+++ b/drivers/s390/char/sclp_con.c
@@ -222,8 +222,6 @@ sclp_console_init(void)
INIT_LIST_HEAD(&sclp_con_pages);
for (i = 0; i < MAX_CONSOLE_PAGES; i++) {
page = alloc_bootmem_low_pages(PAGE_SIZE);
- if (page == NULL)
- return -ENOMEM;
list_add_tail((struct list_head *) page, &sclp_con_pages);
}
INIT_LIST_HEAD(&sclp_con_outqueue);