On 04/04/2016 03:09 PM, Christoph Lameter wrote:
On Mon, 4 Apr 2016, Waiman Long wrote:
+ if ((unsigned int)stat>= pcs->nstats)
+ return;
+ preempt_disable();
+ pstat = this_cpu_ptr(&pcs->stats[stat]);
+ *pstat += cnt;
+ preempt_enable();
+}
pstat = get_cpu_ptr(&pcs->stats[stat]);
*pstat += cnt;
put_cpu_ptr(&pcs->stats[stat]);
It will generate identical code but this one uses APIs, making the
intention clearer. But as I said this is just a minor nit.
you can add my Reviewed-by: Nikolay Borisov<kernel@xxxxxxxx> for this
particular patch.
Yes, that will certainly make it look nicer. I will update the patch once I
get feedback from my other ext4 patches.
Why not
this_cpu_add(pci->stats[stat], cnt)
This is a single instruction on x86.
Yes, using this_cpu_add() will be even simpler.
Cheers,
Longman
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