[Bug libc/27398] x86: Improve testing false positive for tst-cpu-features-cpuinfo with bad hardware.

[carlos at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27398

--- Comment #12 from Carlos O'Donell <carlos at redhat dot com> ---
(In reply to H.J. Lu from comment #11)
> Created attachment 13910 [details]
> The v2 patch
> 
> Please try this.

Thanks HJ.

My apologies, I made a mistake during testing, this still fails:

[carlos@fedora ~]$ taskset --cpu-list 0,1 ~/build/glibc-review/testrun.sh
/home/carlos/build/glibc-review/elf/tst-cpu-features-cpuinfo-static; echo $?

Checking HAS_CPU_FEATURE (HLE):
  HAS_CPU_FEATURE (HLE): 1
  cpuinfo (hle): 0
 *** failure ***

Checking HAS_CPU_FEATURE (RTM):
  HAS_CPU_FEATURE (RTM): 1
  cpuinfo (rtm): 0
 *** failure ***

Likewise:

[carlos@fedora ~]$ taskset --cpu-list 0,1 ~/build/glibc-review/testrun.sh
/home/carlos/build/glibc-review/string/tst-memchr-rtm; echo $?
error: ../sysdeps/x86/tst-string-rtm.h:63: TSX abort rate: 100.00% (3000 out of
3000)
error: 1 test failures
1
[carlos@fedora ~]$ taskset --cpu-list 0,1 ~/build/glibc-review/testrun.sh
/home/carlos/build/glibc-review/string/tst-memchr-rtm; echo $?
77

[carlos@fedora ~]$ taskset --cpu-list 0,1 ~/build/glibc-review-i686/testrun.sh
/home/carlos/build/glibc-review-i686/string/tst-memchr-rtm; echo $?
77
[carlos@fedora ~]$ taskset --cpu-list 0,1 ~/build/glibc-review-i686/testrun.sh
/home/carlos/build/glibc-review-i686/string/tst-memchr-rtm; echo $?
error: ../sysdeps/x86/tst-string-rtm.h:63: TSX abort rate: 100.00% (3000 out of
3000)
error: 1 test failures
1

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