[LTP] power_management: rewrite runpwtests04.sh in C

[linuxtestproject.agent@gmail.com]

Hi Jinseok,

On Sat, 13 Jun 2026 02:13:46 +0900, Jinseok Kim wrote:
> power_management: rewrite runpwtests04.sh in C

> The new implementation preserves the original test semantics while
> removing shell dependencies.

This claim is inaccurate in at least two ways:

1. The original shell script calls check_arch from pm_include.sh,
which gates the test to x86/x86_64 and reports TCONF on other
architectures. The new C test drops this gate entirely, relying
on runtime sysfs presence instead. That is arguably better
(runtime detection over compile-time assumptions), but it is a
semantic change that should be mentioned.

2. When /sys/devices/system/cpu/cpuidle does not exist, the
original script skips the loop and falls through to PASS. The
new test calls tst_brk(TCONF) in setup. Again an improvement,
but not "preserved semantics".

Consider rewording the commit body to acknowledge these
intentional behavioral changes rather than claiming equivalence.

Verdict - Needs revision

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