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Date: Sat, 3 Feb 2018 17:46:06 -0500 From: Matthew Whitehead <tedheadster@...il.com> To: linux-kernel@...r.kernel.org Cc: Matthew Whitehead <tedheadster@...il.com> Subject: [PATCH 1/3] x86/Kconfig : Add missing i586-class cpus to X86_CMPXCHG64 Kconfig group Several i586-class cpus supporting this instruction are missing from the X86_CMPXCHG64 config group. Using a configuration with either M586TSC or M586MMX currently sets X86_MINIMUM_CPU_FAMILY=4 instead of the correct value 5. Booting on an i486 it will fail to generate the "This kernel requires an i586 CPU, but only detected an i486 CPU" message and intentional halt as expected. It will instead just silently hang when it hits i586-specific instructions. The M586 cpu is not in this list because at least the Cyrix 5x86 lacks this instruction, and perhaps others. Signed-off-by: Matthew Whitehead <tedheadster@...il.com> --- arch/x86/Kconfig.cpu | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu index 65a9a47..ec64aa7 100644 --- a/arch/x86/Kconfig.cpu +++ b/arch/x86/Kconfig.cpu @@ -374,7 +374,7 @@ config X86_TSC config X86_CMPXCHG64 def_bool y - depends on X86_PAE || X86_64 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MATOM + depends on X86_PAE || X86_64 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586TSC || M586MMX || MATOM || MGEODE_LX || MGEODEGX1 || MK6 || MK7 || MK8 # this should be set for all -march=.. options where the compiler # generates cmov. -- 1.8.3.1
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