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author | Milton Miller <miltonm@bga.com> | 2007-10-17 14:55:11 (GMT) |
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committer | Ingo Molnar <mingo@elte.hu> | 2007-10-17 14:55:11 (GMT) |
commit | cd79007634854f9e936e2369890f2512f94b8759 (patch) | |
tree | 904e9d4f406bf5d48699027f415e6acd12cc9121 /kernel/sched.c | |
parent | ebb3e820b83e426ee331bae6d8fb0e54f472a25d (diff) | |
download | linux-fsl-qoriq-cd79007634854f9e936e2369890f2512f94b8759.tar.xz |
sched: more robust sd-sysctl entry freeing
It occurred to me this morning that the procname field was dynamically
allocated and needed to be freed. I started to put in break statements
when allocation failed but it was approaching 50% error handling code.
I came up with this alternative of looping while entry->mode is set and
checking proc_handler instead of ->table. Alternatively, the string
version of the domain name and cpu number could be stored the structs.
I verified by compiling CONFIG_DEBUG_SLAB and checking the allocation
counts after taking a cpuset exclusive and back.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched.c')
-rw-r--r-- | kernel/sched.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index 0da2b26..5e220bf 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -5272,11 +5272,20 @@ static struct ctl_table *sd_alloc_ctl_entry(int n) static void sd_free_ctl_entry(struct ctl_table **tablep) { - struct ctl_table *entry = *tablep; + struct ctl_table *entry; - for (entry = *tablep; entry->procname; entry++) + /* + * In the intermediate directories, both the child directory and + * procname are dynamically allocated and could fail but the mode + * will always be set. In the lowest directory the names are + * static strings and all have proc handlers. + */ + for (entry = *tablep; entry->mode; entry++) { if (entry->child) sd_free_ctl_entry(&entry->child); + if (entry->proc_handler == NULL) + kfree(entry->procname); + } kfree(*tablep); *tablep = NULL; |