[LTP] [PATCH v1 1/1] libs: libltpnuma: Fix one fake failure when CXL(Compute eXpress Link) node memory is not used

[Pengfei Xu]

Hi Cyril,

On 2023-05-09 at 16:10:35 +0200, Cyril Hrubis wrote:
> Hi!
> > # ./get_mempolicy01
> > tst_test.c:1560: TINFO: Timeout per run is 0h 00m 30s
> > tst_numa.c:208: TINFO: Found 3 NUMA memory nodes
> > tst_numa.c:162: TWARN: Faield to parse '/sys/devices/system/node/node0/meminfo' MemUsed:65220292
> > tst_numa.c:162: TWARN: Faield to parse '/sys/devices/system/node/node1/meminfo' MemUsed:65167784
> > tst_numa.c:162: TWARN: Faield to parse '/sys/devices/system/node/node2/meminfo' MemUsed:4194304
> > get_mempolicy01.c:149: TCONF: test requires at least one NUMA memory node
> > Node 0 and 1 could not be tested with follow patch installed, seems when
> > node2/meminfo "MemUsed: 0"，sscanf("...%li", &val) will return 0 if only 0 value
> > will be scaned, and the while loop will scan the char one by one and impact all
> > other node meminfo scan result, it's strange.
> > 
> > If used my patch, I didn't meet this issue.
> 
> Ah, right the file is multiline and we match only one of the lines per
> iteration...
> 
> Then we need:
> 
  Yes, below patch works well and as expected for all nodes memory check now.

  Below way is better and correct.

  Thanks!
  BR.

> diff --git a/libs/libltpnuma/tst_numa.c b/libs/libltpnuma/tst_numa.c
> index ef4c8e879..c3297013b 100644
> --- a/libs/libltpnuma/tst_numa.c
> +++ b/libs/libltpnuma/tst_numa.c
> @@ -127,8 +127,8 @@ static int node_has_enough_memory(int node, size_t min_kb)
>  {
>         char path[1024];
>         char buf[1024];
> -       long mem_total = 0;
> -       long mem_used = 0;
> +       long mem_total = -1;
> +       long mem_used = -1;
>         long file_pages = 0;
>         long mem_avail;
> 
> @@ -161,7 +161,7 @@ static int node_has_enough_memory(int node, size_t min_kb)
> 
>         fclose(fp);
> 
> -       if (!mem_total || !mem_used) {
> +       if (mem_total == -1 || mem_used == -1) {
>                 tst_res(TWARN, "Failed to parse '%s'", path);
>                 return 0;
>         }
> 
> -- 
> Cyril Hrubis
> chrubis@suse.cz