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[PATCH] uml: locking documentation

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Some locking documentation and a cleanup.  uml_exitcode is copied into a local
before sprintf sees it, in case sprintf does anything non-atomic with it.

The rest are comments about why certain globals don't need any kind of
locking.

Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jeff Dike 2006-09-29 01:58:50 -07:00 • committed by Linus Torvalds
parent b10aeeef55
commit 730760e90a
5 changed files with 14 additions and 2 deletions
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8
arch/um/kernel/exitcode.c
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@ -16,9 +16,13 @@ int uml_exitcode = 0;
static int read_proc_exitcode(char *page, char **start, off_t off,
int count, int *eof, void *data)
{
int len;
int len, val;
len = sprintf(page, "%d\n", uml_exitcode);
/* Save uml_exitcode in a local so that we don't need to guarantee
* that sprintf accesses it atomically.
*/
val = uml_exitcode;
len = sprintf(page, "%d\n", val);
len -= off;
if(len <= off+count) *eof = 1;
*start = page + off;