This is a note to let you know that I've just added the patch titled x86/asm/32: Make sync_core() handle missing CPUID on all 32-bit kernels to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: x86-asm-32-make-sync_core-handle-missing-cpuid-on-all-32-bit-kernels.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 1c52d859cb2d417e7216d3e56bb7fea88444cec9 Mon Sep 17 00:00:00 2001 From: Andy Lutomirski <luto@xxxxxxxxxx> Date: Fri, 9 Dec 2016 10:24:05 -0800 Subject: x86/asm/32: Make sync_core() handle missing CPUID on all 32-bit kernels From: Andy Lutomirski <luto@xxxxxxxxxx> commit 1c52d859cb2d417e7216d3e56bb7fea88444cec9 upstream. We support various non-Intel CPUs that don't have the CPUID instruction, so the M486 test was wrong. For now, fix it with a big hammer: handle missing CPUID on all 32-bit CPUs. Reported-by: One Thousand Gnomes <gnomes@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxx> Cc: Juergen Gross <jgross@xxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Brian Gerst <brgerst@xxxxxxxxx> Cc: Matthew Whitehead <tedheadster@xxxxxxxxx> Cc: Borislav Petkov <bp@xxxxxxxxx> Cc: Henrique de Moraes Holschuh <hmh@xxxxxxxxxx> Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> Cc: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx> Cc: xen-devel <Xen-devel@xxxxxxxxxxxxx> Link: http://lkml.kernel.org/r/685bd083a7c036f7769510b6846315b17d6ba71f.1481307769.git.luto@xxxxxxxxxx Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: "Zhang, Ning A" <ning.a.zhang@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/x86/include/asm/processor.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -596,7 +596,7 @@ static inline void sync_core(void) { int tmp; -#ifdef CONFIG_M486 +#ifdef CONFIG_X86_32 /* * Do a CPUID if available, otherwise do a jump. The jump * can conveniently enough be the jump around CPUID. Patches currently in stable-queue which might be from luto@xxxxxxxxxx are queue-4.9/x86-asm-32-make-sync_core-handle-missing-cpuid-on-all-32-bit-kernels.patch