Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1229543

Re: [PATCH v2 1/2] x86/msr: Carry on after a non-"safe" MSR access fails without !panic_on_oops

Show all headers | View raw

On Mon, Sep 21, 2015 at 1:46 AM, Ingo Molnar <mingo@kernel.org> wrote:
>
> Linus, what's your preference?

So quite frankly, is there any reason we don't just implement
native_read_msr() as just

   unsigned long long native_read_msr(unsigned int msr)
   {
      int err;
      unsigned long long val;

      val = native_read_msr_safe(msr, &err);
      WARN_ON_ONCE(err);
      return val;
   }

Note: no inline, no nothing. Just put it in arch/x86/lib/msr.c, and be
done with it. I don't see the downside.

How many msr reads are <i>so</i> critical that the function call
overhead would matter? Get rid of the inline version of the _safe()
thing too, and put that thing there too.

                  Linus
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

[PATCH v2 0/2] x86/msr: MSR access failure changes Andy Lutomirski <luto@kernel.org> - 2015-09-21 02:10 +0200
  [PATCH v2 1/2] x86/msr: Carry on after a non-"safe" MSR access fails without !panic_on_oops Andy Lutomirski <luto@kernel.org> - 2015-09-21 02:10 +0200
    Re: [PATCH v2 1/2] x86/msr: Carry on after a non-"safe" MSR access  fails without !panic_on_oops Linus Torvalds <torvalds@linux-foundation.org> - 2015-09-21 02:20 +0200
      Re: [PATCH v2 1/2] x86/msr: Carry on after a non-"safe" MSR access  fails without !panic_on_oops Andy Lutomirski <luto@amacapital.net> - 2015-09-21 03:20 +0200
        Re: [PATCH v2 1/2] x86/msr: Carry on after a non-"safe" MSR access  fails without !panic_on_oops Ingo Molnar <mingo@kernel.org> - 2015-09-21 10:50 +0200
          Re: [PATCH v2 1/2] x86/msr: Carry on after a non-"safe" MSR access  fails without !panic_on_oops Paolo Bonzini <pbonzini@redhat.com> - 2015-09-21 14:30 +0200
          Re: [PATCH v2 1/2] x86/msr: Carry on after a non-"safe" MSR access  fails without !panic_on_oops Linus Torvalds <torvalds@linux-foundation.org> - 2015-09-21 18:40 +0200
            Re: [PATCH v2 1/2] x86/msr: Carry on after a non-"safe" MSR access  fails without !panic_on_oops Arjan van de Ven <arjan@linux.intel.com> - 2015-09-21 19:10 +0200
              Re: [PATCH v2 1/2] x86/msr: Carry on after a non-"safe" MSR access  fails without !panic_on_oops Linus Torvalds <torvalds@linux-foundation.org> - 2015-09-21 19:30 +0200
              Re: [PATCH v2 1/2] x86/msr: Carry on after a non-"safe" MSR access  fails without !panic_on_oops Andy Lutomirski <luto@amacapital.net> - 2015-09-21 19:50 +0200
                Re: [PATCH v2 1/2] x86/msr: Carry on after a non-"safe" MSR access  fails without !panic_on_oops Paolo Bonzini <pbonzini@redhat.com> - 2015-09-22 10:20 +0200
            Re: [PATCH v2 1/2] x86/msr: Carry on after a non-"safe" MSR access  fails without !panic_on_oops Andy Lutomirski <luto@amacapital.net> - 2015-09-21 20:20 +0200
              Re: [PATCH v2 1/2] x86/msr: Carry on after a non-"safe" MSR access  fails without !panic_on_oops Borislav Petkov <bp@alien8.de> - 2015-09-21 20:40 +0200
              Re: [PATCH v2 1/2] x86/msr: Carry on after a non-"safe" MSR access  fails without !panic_on_oops Linus Torvalds <torvalds@linux-foundation.org> - 2015-09-21 20:50 +0200
            Re: [PATCH v2 1/2] x86/msr: Carry on after a non-"safe" MSR access  fails without !panic_on_oops Ingo Molnar <mingo@kernel.org> - 2015-09-22 09:20 +0200
            Re: [PATCH v2 1/2] x86/msr: Carry on after a non-"safe" MSR access  fails without !panic_on_oops Peter Zijlstra <peterz@infradead.org> - 2015-09-30 15:20 +0200
              Re: [PATCH v2 1/2] x86/msr: Carry on after a non-"safe" MSR access  fails without !panic_on_oops Ingo Molnar <mingo@kernel.org> - 2015-09-30 16:10 +0200
                Re: [PATCH v2 1/2] x86/msr: Carry on after a non-"safe" MSR access  fails without !panic_on_oops Andy Lutomirski <luto@amacapital.net> - 2015-09-30 20:10 +0200
                Re: [PATCH v2 1/2] x86/msr: Carry on after a non-"safe" MSR access  fails without !panic_on_oops Ingo Molnar <mingo@kernel.org> - 2015-10-01 09:20 +0200
            Re: [PATCH v2 1/2] x86/msr: Carry on after a non-"safe" MSR access  fails without !panic_on_oops "H. Peter Anvin" <hpa@zytor.com> - 2015-09-30 20:40 +0200
  [PATCH v2 2/2] x86/msr: Set the return value to zero when native_rdmsr_safe fails Andy Lutomirski <luto@kernel.org> - 2015-09-21 02:10 +0200

csiph-web