Re: [PATCH 1/3] cpupower: Add generic CPPC performance display

[Thorsten Leemhuis]

On 7/10/26 00:13, Jeremy Linton wrote:
> Arm64 machines, and possibly others, use the standard ACPI defined CPPC
> infrastructure. cpupower has CPPC support, but it's largely written
> around the intricacies of AMD processors, using platform MSRs to avoid
> shortcomings in the specification.
> 
> [...]
> +#include <stdio.h>
> +#include <errno.h>
> +#include <stdlib.h>
> +#include <string.h>
> +#include <math.h>
> +
> +#include "helpers/helpers.h"
> +#include "cpufreq.h"
> +#include "acpi_cppc.h"
> +
> +#define cppc_to_frequency(perf) (roundf(slope * (perf) + intercept))
FYI, this patch showed up in -next yesterday and I suspect it caused
this build error for me on x86_64:

"""  CC       cpupower
/usr/bin/ld.bfd: /tmp/ccjOeWLF.ltrans0.ltrans.o: in function
`get_perf_cap.isra.0':
/builddir/build/BUILD/kernel-7.2.0-build/kernel-next-20260717/linux-7.2.0-0.0.next.20260717.330.vanilla.fc44.x86_64/tools/power/cpupower/utils/helpers/cppc.c:39:(.text+0x45cc):
undefined reference to `roundf'
/usr/bin/ld.bfd:
/tmp/ccjOeWLF.ltrans0.ltrans.o:/builddir/build/BUILD/kernel-7.2.0-build/kernel-next-20260717/linux-7.2.0-0.0.next.20260717.330.vanilla.fc44.x86_64/tools/power/cpupower/utils/helpers/cppc.c:49:(.text+0x46a2):
undefined reference to `roundf'
collect2: error: ld returned 1 exit status
make: *** [Makefile:238: cpupower] Error 1
"""
> [...]

Full log:
https://download.copr.fedorainfracloud.org/results/@kernel-vanilla/next/fedora-44-x86_64/10739303-next-next-all/builder-live.log.gz

Ciao, Thorsten