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 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
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-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From 1c52d859cb2d417e7216d3e56bb7fea88444cec9 Mon Sep 17 00:00:00 2001
From: Andy Lutomirski luto@kernel.org 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@kernel.org
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@lxorguk.ukuu.org.uk Signed-off-by: Andy Lutomirski luto@kernel.org Cc: Juergen Gross jgross@suse.com Cc: Peter Zijlstra peterz@infradead.org Cc: Brian Gerst brgerst@gmail.com Cc: Matthew Whitehead tedheadster@gmail.com Cc: Borislav Petkov bp@alien8.de Cc: Henrique de Moraes Holschuh hmh@hmh.eng.br Cc: Andrew Cooper andrew.cooper3@citrix.com Cc: Boris Ostrovsky boris.ostrovsky@oracle.com Cc: xen-devel Xen-devel@lists.xen.org Link: http://lkml.kernel.org/r/685bd083a7c036f7769510b6846315b17d6ba71f.1481307769... Signed-off-by: Thomas Gleixner tglx@linutronix.de Cc: "Zhang, Ning A" ning.a.zhang@intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- 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 @@ -574,7 +574,7 @@ 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@kernel.org are
queue-4.4/x86-asm-32-make-sync_core-handle-missing-cpuid-on-all-32-bit-kernels.patch