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SLUB: fix behavior if the text output of list_locations overflows PAGE_SIZE

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If slabs are allocated or freed from a large set of call sites (typical for
the kmalloc area) then we may create more output than fits into a single
PAGE and sysfs only gives us one page.  The output should be truncated.
This patch fixes the checks to do the truncation properly.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Lameter 2007-06-23 17:16:32 -07:00 committed by Linus Torvalds
parent 1e27dbe774
commit 8496634302
1 changed files with 4 additions and 2 deletions
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6
mm/slub.c
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@ -3042,13 +3042,15 @@ static int list_locations(struct kmem_cache *s, char *buf,
n += sprintf(buf + n, " pid=%ld",
l->min_pid);
if (num_online_cpus() > 1 && !cpus_empty(l->cpus)) {
if (num_online_cpus() > 1 && !cpus_empty(l->cpus) &&
n < PAGE_SIZE - 60) {
n += sprintf(buf + n, " cpus=");
n += cpulist_scnprintf(buf + n, PAGE_SIZE - n - 50,
l->cpus);
}
if (num_online_nodes() > 1 && !nodes_empty(l->nodes)) {
if (num_online_nodes() > 1 && !nodes_empty(l->nodes) &&
n < PAGE_SIZE - 60) {
n += sprintf(buf + n, " nodes=");
n += nodelist_scnprintf(buf + n, PAGE_SIZE - n - 50,
l->nodes);