linux-kernel - Re: [PATCH v4 02/15] x86/msr: Move rdtsc{,

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Message-ID: <4b896294-66a3-4f4b-84f2-ec67dbaa9a6e@zytor.com>
Date: Fri, 2 May 2025 11:00:47 -0700
From: Xin Li <xin@...or.com>
To: Ingo Molnar <mingo@...nel.org>
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Subject: Re: [PATCH v4 02/15] x86/msr: Move rdtsc{,_ordered}() to <asm/tsc.h>

On 5/2/2025 1:52 AM, Ingo Molnar wrote:
> 
> * Xin Li (Intel) <xin@...or.com> wrote:
> 
>> For some reason, there are some TSC-related functions in the MSR
>> header even though there is a tsc.h header.
>>
>> Relocate rdtsc{,_ordered}() from <asm/msr.h> to <asm/tsc.h>, and
>> subsequently remove the inclusion of <asm/msr.h> in <asm/tsc.h>.
>>
>> Signed-off-by: Xin Li (Intel) <xin@...or.com>
>> Acked-by: Dave Hansen <dave.hansen@...ux.intel.com>
>> Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> 
>> --- a/arch/x86/include/asm/tsc.h
>> +++ b/arch/x86/include/asm/tsc.h
>> @@ -7,7 +7,81 @@
>>   
>>   #include <asm/cpufeature.h>
>>   #include <asm/processor.h>
>> -#include <asm/msr.h>
> 
> Note that in the tip:x86/msr commit I've applied today I've
> intentionally delayed the removal of this header dependency, to reduce
> the probability of breaking -next today or in the near future.
> 
> We can remove that now superfluous header dependency in a future patch.
> 

This is truly a brilliant decision!

Especially regarding the issues Ilpo identified.

Thanks!
     Xin