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authorSteven Rostedt <rostedt@goodmis.org>2012-06-29 15:40:11 (GMT)
committerAntti Palosaari <crope@iki.fi>2012-07-03 19:57:26 (GMT)
commite70b342f9a97040c3a70db4cf82b7662e51f194d (patch)
tree274edac8d367e4a7c3746b2a4f9cbbdd5a51eae7
parent0baadae3372a61f1e060fb3344ba97c474cbdc31 (diff)
printk: Optimize if statement logic where newline exists
In reviewing Kay's fix up patch: "printk: Have printk() never buffer its data", I found two if statements that could be combined and optimized. Put together the two 'cont.len && cont.owner == current' if statements into a single one, and check if we need to call cont_add(). This also removes the unneeded double cont_flush() calls. Link: http://lkml.kernel.org/r/1340869133.876.10.camel@mop Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Cc: Kay Sievers <kay@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--kernel/printk.c13
1 files changed, 6 insertions, 7 deletions
diff --git a/kernel/printk.c b/kernel/printk.c
index fbf4d0b..5ae6b09 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -1496,15 +1496,14 @@ asmlinkage int vprintk_emit(int facility, int level,
bool stored = false;
/*
- * Flush the conflicting buffer. An earlier newline was missing,
- * or we race with a continuation line from an interrupt.
+ * If an earlier newline was missing and it was the same task,
+ * either merge it with the current buffer and flush, or if
+ * there was a race with interrupts (prefix == true) then just
+ * flush it out and store this line separately.
*/
- if (cont.len && prefix && cont.owner == current)
- cont_flush();
-
- /* Merge with our buffer if possible; flush it in any case */
if (cont.len && cont.owner == current) {
- stored = cont_add(facility, level, text, text_len);
+ if (!prefix)
+ stored = cont_add(facility, level, text, text_len);
cont_flush();
}

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