Re: [PATCH] perf/x86/intel/p4: Fix unused variable warning in p4_pmu_init()

[Dave Hansen]

On 3/19/26 08:22, Aldo Conte wrote:
> This patch prints the full content of Model-Specific Register
> via `pr_cont` and so both the low and high part. It is also
> very useful to have the contents of MSR_IA32_MISC_ENABLE
> in dmesg for debugging purposes.

I'd probably just switch it over to rdmsrq():

	unsigned int misc;

	rdmsr(MSR_IA32_MISC_ENABLE, misc);

	if (!(misc & MSR_IA32_MISC_ENABLE_EMON)) {
		...

I'm kinda surprised the compiler is complaining, though. I suspect we've
got a ton of these around where one of the registers isn't used.