Re: [PATCH] x86/perf : Add check for CPUID instruction before using

2018-02-02 Thread Arnaldo Carvalho de Melo
Em Fri, Feb 02, 2018 at 03:37:31PM +0100, Borislav Petkov escreveu: > On Fri, Feb 02, 2018 at 09:30:51AM -0500, Matthew Whitehead wrote: > > We still officially support the ancient i486 cpu. First generation > > versions of this processor do not have the CPUID instruction, though > > later versions

Re: [PATCH] x86/perf : Add check for CPUID instruction before using

2018-02-02 Thread Arnaldo Carvalho de Melo
Em Fri, Feb 02, 2018 at 09:30:51AM -0500, Matthew Whitehead escreveu: > We still officially support the ancient i486 cpu. First generation > versions of this processor do not have the CPUID instruction, though > later versions do. Therefore you must check that the cpu supports > it before using it.

Re: [PATCH] x86/perf : Add check for CPUID instruction before using

2018-02-02 Thread Borislav Petkov
On Fri, Feb 02, 2018 at 09:30:51AM -0500, Matthew Whitehead wrote: > We still officially support the ancient i486 cpu. First generation > versions of this processor do not have the CPUID instruction, though > later versions do. Therefore you must check that the cpu supports > it before using it. At

[PATCH] x86/perf : Add check for CPUID instruction before using

2018-02-02 Thread Matthew Whitehead
We still officially support the ancient i486 cpu. First generation versions of this processor do not have the CPUID instruction, though later versions do. Therefore you must check that the cpu supports it before using it. At present it fails with an "Illegal Instruction" signal on the early process