This is a note to let you know that I've just added the patch titled

x86/tlb: Drop the _GPL from the cpu_tlbstate export

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-tlb-drop-the-_gpl-from-the-cpu_tlbstate-export.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 1e5476815fd7f98b888e01a0f9522b63085f96c9 Mon Sep 17 00:00:00 2001

From: Thomas Gleixner tglx@linutronix.de Date: Thu, 4 Jan 2018 22:19:04 +0100 Subject: x86/tlb: Drop the _GPL from the cpu_tlbstate export

From: Thomas Gleixner tglx@linutronix.de

commit 1e5476815fd7f98b888e01a0f9522b63085f96c9 upstream.

The recent changes for PTI touch cpu_tlbstate from various tlb_flush inlines. cpu_tlbstate is exported as GPL symbol, so this causes a regression when building out of tree drivers for certain graphics cards.

Aside of that the export was wrong since it was introduced as it should have been EXPORT_PER_CPU_SYMBOL_GPL().

Use the correct PER_CPU export and drop the _GPL to restore the previous state which allows users to utilize the cards they payed for.

As always I'm really thrilled to make this kind of change to support the #friends (or however the hot hashtag of today is spelled) from that closet sauce graphics corp.

Fixes: 1e02ce4cccdc ("x86: Store a per-cpu shadow copy of CR4") Fixes: 6fd166aae78c ("x86/mm: Use/Fix PCID to optimize user/kernel switches") Reported-by: Kees Cook keescook@google.com Signed-off-by: Thomas Gleixner tglx@linutronix.de Cc: Greg Kroah-Hartman gregkh@linuxfoundation.org Cc: Peter Zijlstra peterz@infradead.org Cc: Andy Lutomirski luto@kernel.org Cc: Thomas Backlund tmb@mageia.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- arch/x86/mm/init.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/mm/init.c +++ b/arch/x86/mm/init.c @@ -757,7 +757,7 @@ DEFINE_PER_CPU_SHARED_ALIGNED(struct tlb .state = 0, .cr4 = ~0UL, /* fail hard if we screw up cr4 shadow initialization */ }; -EXPORT_SYMBOL_GPL(cpu_tlbstate); +EXPORT_PER_CPU_SYMBOL(cpu_tlbstate);

void update_cache_mode_entry(unsigned entry, enum page_cache_mode cache) {

Patches currently in stable-queue which might be from tglx@linutronix.de are

queue-4.4/x86-tlb-drop-the-_gpl-from-the-cpu_tlbstate-export.patch queue-4.4/x86-kasan-write-protect-kasan-zero-shadow.patch queue-4.4/x86-microcode-amd-add-support-for-fam17h-microcode-loading.patch