[dpdk-dev] [PATCH] eal: avoid side effects in RTE_ALIGN_MUL_NEAR(v, mul) for v and mul

Tyler Retzlaff roretzla at linux.microsoft.com
Fri Mar 12 07:28:17 CET 2021


On Thu, Mar 11, 2021 at 08:41:58PM -0800, Ranjit Menon wrote:
> 
> On 3/11/2021 5:34 PM, Tyler Retzlaff wrote:
> >On Thu, Mar 11, 2021 at 04:40:58PM -0800, Ranjit Menon wrote:
> >>On 3/11/2021 1:08 PM, Tyler Retzlaff wrote:
> >>>diff --git a/lib/librte_eal/include/rte_common.h b/lib/librte_eal/include/rte_common.h
> >>>index 1b630baf1..640befee2 100644
> >>>--- a/lib/librte_eal/include/rte_common.h
> >>>+++ b/lib/librte_eal/include/rte_common.h
> >>>@@ -345,9 +345,11 @@ static void __attribute__((destructor(RTE_PRIO(prio)), used)) func(void)
> >>>   */
> >>>  #define RTE_ALIGN_MUL_NEAR(v, mul)				\
> >>>  	({							\
> >>>-		typeof(v) ceil = RTE_ALIGN_MUL_CEIL(v, mul);	\
> >>>-		typeof(v) floor = RTE_ALIGN_MUL_FLOOR(v, mul);	\
> >>>-		(ceil - (v)) > ((v) - floor) ? floor : ceil;	\
> >>>+		typeof(v) _v = (v);				\
> >>>+		typeof(v) _m = (mul);				\
> >>For consistency sake, can this variable be changed to '_mul'?
> >sure, i can do that. it will hit another tab stop below though.
> >i'll submit a v2 with the requested change.
> 
> Ugh! In that case, let it be. If others insist on the change, we can do it.

heh, yeah painful. okay i will leave the patch as it is and wait a bit
for someone with a strong opinion.

> 
> ranjit m.
> 
> >
> >>>+		typeof(v) ceil = RTE_ALIGN_MUL_CEIL(_v, _m);	\



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