This reverts commit ed68d7e9b9cfb64f3045ffbcb108df03c09a0f98. The patch wasn't quite correct -- there are non-Intel (and hence non-486) CPUs that we support that don't have CPUID. Since we no longer require CPUID for sync_core(), just revert the patch.
I think the relevant CPUs are Geode and Elan, but I'm not sure. In principle, we should try to do better at identifying CPUID-less CPUs in early boot, but that's more complicated. Reported-by: One Thousand Gnomes <[email protected]> Cc: Matthew Whitehead <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Brian Gerst <[email protected]> Cc: Denys Vlasenko <[email protected]> Cc: H. Peter Anvin <[email protected]> Cc: Josh Poimboeuf <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Signed-off-by: Andy Lutomirski <[email protected]> --- arch/x86/boot/cpu.c | 6 ------ 1 file changed, 6 deletions(-) diff --git a/arch/x86/boot/cpu.c b/arch/x86/boot/cpu.c index 4224ede43b4e..26240dde081e 100644 --- a/arch/x86/boot/cpu.c +++ b/arch/x86/boot/cpu.c @@ -87,12 +87,6 @@ int validate_cpu(void) return -1; } - if (CONFIG_X86_MINIMUM_CPU_FAMILY <= 4 && !IS_ENABLED(CONFIG_M486) && - !has_eflag(X86_EFLAGS_ID)) { - printf("This kernel requires a CPU with the CPUID instruction. Build with CONFIG_M486=y to run on this CPU.\n"); - return -1; - } - if (err_flags) { puts("This kernel requires the following features " "not present on the CPU:\n"); -- 2.9.3
