[PATCH] powerpc: Silent SW timebase sync
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: 2008-10-15 04:25:28
When no HW method is provided to sync the timebase, linux uses a software algorithm. The code for that is very verbose using straight printk's without log level. A lot of this is mostly useless unless you want to debug the process, and we didn't have any problem with it for years anyway so this turns the bunch of them into pr_debug. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> --- arch/powerpc/kernel/smp-tbsync.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-)
--- linux-work.orig/arch/powerpc/kernel/smp-tbsync.c 2008-10-15 14:42:24.000000000 +1100
+++ linux-work/arch/powerpc/kernel/smp-tbsync.c 2008-10-15 15:23:03.000000000 +1100@@ -113,7 +113,7 @@ void __devinit smp_generic_give_timebase { int i, score, score2, old, min=0, max=5000, offset=1000; - printk("Synchronizing timebase\n"); + pr_debug("Software timebase sync\n"); /* if this fails then this kernel won't work anyway... */ tbsync = kzalloc( sizeof(*tbsync), GFP_KERNEL );
@@ -123,13 +123,13 @@ void __devinit smp_generic_give_timebase while (!tbsync->ack) barrier(); - printk("Got ack\n"); + pr_debug("Got ack\n"); /* binary search */ for (old = -1; old != offset ; offset = (min+max) / 2) { score = start_contest(kSetAndTest, offset, NUM_ITER); - printk("score %d, offset %d\n", score, offset ); + pr_debug("score %d, offset %d\n", score, offset ); if( score > 0 ) max = offset;
@@ -140,8 +140,8 @@ void __devinit smp_generic_give_timebase score = start_contest(kSetAndTest, min, NUM_ITER); score2 = start_contest(kSetAndTest, max, NUM_ITER); - printk("Min %d (score %d), Max %d (score %d)\n", - min, score, max, score2); + pr_debug("Min %d (score %d), Max %d (score %d)\n", + min, score, max, score2); score = abs(score); score2 = abs(score2); offset = (score < score2) ? min : max;
@@ -155,7 +155,7 @@ void __devinit smp_generic_give_timebase if (score2 <= score || score2 < 20) break; } - printk("Final offset: %d (%d/%d)\n", offset, score2, NUM_ITER ); + pr_debug("Final offset: %d (%d/%d)\n", offset, score2, NUM_ITER ); /* exiting */ tbsync->cmd = kExit;