[dpdk-dev] [EXT] [PATCH v6 1/3] eal/arm64: add 128-bit atomic compare exchange

[Phil Yang (Arm Technology China)]

> -----Original Message-----
> From: Jerin Jacob Kollanukkaran <jerinj at marvell.com>
> Sent: Tuesday, July 23, 2019 12:57 AM
> To: Phil Yang (Arm Technology China) <Phil.Yang at arm.com>; dev at dpdk.org
> Cc: thomas at monjalon.net; gage.eads at intel.com;
> hemant.agrawal at nxp.com; Honnappa Nagarahalli
> <Honnappa.Nagarahalli at arm.com>; Gavin Hu (Arm Technology China)
> <Gavin.Hu at arm.com>; nd <nd at arm.com>
> Subject: RE: [EXT] [PATCH v6 1/3] eal/arm64: add 128-bit atomic compare
> exchange
> 
> > -----Original Message-----
> > From: Phil Yang <phil.yang at arm.com>
> > Sent: Monday, July 22, 2019 9:53 PM
> > To: dev at dpdk.org
> > Cc: thomas at monjalon.net; Jerin Jacob Kollanukkaran
> <jerinj at marvell.com>;
> > gage.eads at intel.com; hemant.agrawal at nxp.com;
> > Honnappa.Nagarahalli at arm.com; gavin.hu at arm.com; nd at arm.com
> > Subject: [EXT] [PATCH v6 1/3] eal/arm64: add 128-bit atomic compare
> > exchange
> >
> > Add 128-bit atomic compare exchange on aarch64.
> >
> > Suggested-by: Jerin Jacob <jerinj at marvell.com>
> > Signed-off-by: Phil Yang <phil.yang at arm.com>
> > Tested-by: Honnappa Nagarahalli <honnappa.nagarahalli at arm.com>
> > Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli at arm.com>
> >
> > ---
> > diff --git a/config/common_base b/config/common_base index
> > 8ef75c2..de6d1e0 100644
> > --- a/config/common_base
> > +++ b/config/common_base
> > @@ -82,6 +82,8 @@ CONFIG_RTE_MAX_LCORE=128
> >  CONFIG_RTE_MAX_NUMA_NODES=8
> >  CONFIG_RTE_MAX_HEAPS=32
> >  CONFIG_RTE_MAX_MEMSEG_LISTS=64
> 
> 
> Add new line here.
> 
> > +# Use LSE ATOMIC instructions
> 
> I think, you can change the comment to "Use ARM LSE ATOMIC instructions"

OK. Will fix it.

> 
> > +CONFIG_RTE_ARM_FEATURE_ATOMICS=n
> 
> This patches series has following check patch warning. Please fix it
> 
> With above fixes you can add my acked-by in 1/3 and 3/3 patches in next
> revision.

Thank you for your review and your comments.

> 
> 
> I think, you can ignore following warning.
> WARNING:MACRO_WITH_FLOW_CONTROL: Macros with flow control
> statements should be avoided
> 
> [master]dell[dpdk.org] $ ./devtools/checkpatches.sh

Yes. I did this check before upstream this patch. 
I ignored ' WARNING:MACRO_WITH_FLOW_CONTROL: Macros with flow control statements should be avoided ' warnings.
However, I didn't see any LONG_LINE warnings in the CI report here. http://mails.dpdk.org/archives/test-report/2019-July/090889.html
BTW, I think these 3 warnings in the report might be ineluctable.

> 
> ### eal/arm64: add 128-bit atomic compare exchange
> 
> WARNING:LONG_LINE: line over 80 characters

The default tab size is 8. You might need to change it to 4 in the /usr/src/linux/scripts/checkpatch tool. FYI. 

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index a09333f..d3865a4 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -1211,7 +1211,7 @@ sub expand_tabs {
         if ($c eq "\t") {
             $res .= ' ';
             $n++;
-            for (; ($n % 8) != 0; $n++) {
+            for (; ($n % 4) != 0; $n++) {
                 $res .= ' ';
             }
             next;
@@ -3688,11 +3688,11 @@ sub process {
             #print "line<$line> prevline<$prevline> indent<$indent> sindent<$sindent> check<$check> continuation<$continuation> s<$s> 
             cond_lines<$cond_lines> stat_real<$stat_real> stat<$stat>\n";

             if ($check && $s ne '' &&
-                (($sindent % 8) != 0 ||
+                (($sindent % 4) != 0 ||
                  ($sindent < $indent) ||
                  ($sindent == $indent &&
                   ($s !~ /^\s*(?:\}|\{|else\b)/)) ||
-                 ($sindent > $indent + 8))) {
+                 ($sindent > $indent + 4))) {
                 WARN("SUSPECT_CODE_INDENT",
                      "suspect code indent for conditional statements ($indent, $sindent)\n" . $herecurr . "$stat_real\n");
             }


> #103: FILE: lib/librte_eal/common/include/arch/arm/rte_atomic_64.h:60:
> +               rte_int128_t updated)                                               \
> 
> WARNING:LONG_LINE: line over 80 characters
> #108: FILE: lib/librte_eal/common/include/arch/arm/rte_atomic_64.h:65:
> +        */                                                                     \