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

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Message-ID: <aBR_1oQN-gKCREBD@gmail.com>
Date: Fri, 2 May 2025 10:18:30 +0200
From: Ingo Molnar <mingo@...nel.org>
To: "Xin Li (Intel)" <xin@...or.com>
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Subject: Re: [PATCH v4 02/15] x86/msr: Move rdtsc{,_ordered}() to <asm/tsc.h>


* 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.

The real reason is that the rdtsc{,_ordered}() methods use the 
EAX_EDX_*() macros to optimize their EDX/EAX assembly accessors, which 
is why these methods were in <asm/msr.h>.

Your followup patch tacitly acknowledges this by silently creating 
duplicate copies of these facilities in both headers ...

I've cleaned it all up in tip:x86/msr via these preparatory patches:

  x86/msr: Improve the comments of the DECLARE_ARGS()/EAX_EDX_VAL()/EAX_EDX_RET() facility
  x86/msr: Rename DECLARE_ARGS() to EAX_EDX_DECLARE_ARGS
  x86/msr: Move the EAX_EDX_*() methods from <asm/msr.h> to <asm/asm.h>

Thanks,

	Ingo