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[S390] drivers/s390: Eliminate NULL test and memset after alloc_bootmem

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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>
This commit is contained in:
Julia Lawall 2008-07-14 09:59:13 +02:00 committed by Heiko Carstens
parent 402a3998ba
commit 3ca1c9907a
2 changed files with 1 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/s390/char/raw3270.c
View File

@ -153,19 +153,10 @@ struct raw3270_request __init *raw3270_request_alloc_bootmem(size_t size)
struct raw3270_request *rq;
rq = alloc_bootmem_low(sizeof(struct raw3270));
if (!rq)
return ERR_PTR(-ENOMEM);
memset(rq, 0, sizeof(struct raw3270_request));
/* alloc output buffer. */
if (size > 0) {
if (size > 0)
rq->buffer = alloc_bootmem_low(size);
if (!rq->buffer) {
free_bootmem((unsigned long) rq,
sizeof(struct raw3270));
return ERR_PTR(-ENOMEM);
}
}
rq->size = size;
INIT_LIST_HEAD(&rq->list);

2
drivers/s390/char/sclp_con.c
View File

@ -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);