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authorDavid Woodhouse <dwmw2@shinybook.infradead.org>2005-07-18 14:24:46 -0400
committerDavid Woodhouse <dwmw2@shinybook.infradead.org>2005-07-18 14:24:46 -0400
commitce625a801664d8ed7344117bbb57510e4e0e872c (patch)
tree50e6760a0b1b506b234700afddc7296b28918650 /kernel/audit.c
parentd5b454f2c40c9efd0cc113bc3220ebcb66b7c022 (diff)
downloadlwn-ce625a801664d8ed7344117bbb57510e4e0e872c.tar.gz
lwn-ce625a801664d8ed7344117bbb57510e4e0e872c.zip
AUDIT: Reduce contention in audit_serial()
... by generating serial numbers only if an audit context is actually _used_, rather than doing so at syscall entry even when the context isn't necessarily marked auditable. Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Diffstat (limited to 'kernel/audit.c')
-rw-r--r--kernel/audit.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/audit.c b/kernel/audit.c
index 27ffcf363f8d..d321e251d32b 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -625,7 +625,9 @@ unsigned int audit_serial(void)
unsigned int ret;
spin_lock_irqsave(&serial_lock, flags);
- ret = serial++;
+ do {
+ ret = ++serial;
+ } while (unlikely(!ret));
spin_unlock_irqrestore(&serial_lock, flags);
return ret;