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

x86/platform/uv/BAU: Fix HUB errors by remove initial write to sw-ack register

to the 4.9-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-platform-uv-bau-fix-hub-errors-by-remove-initial-write-to-sw-ack-register.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@vger.kernel.org know about it.

From foo@baz Tue Dec 12 13:26:17 CET 2017

From: Andrew Banman abanman@hpe.com Date: Fri, 17 Feb 2017 11:07:49 -0600 Subject: x86/platform/uv/BAU: Fix HUB errors by remove initial write to sw-ack register

From: Andrew Banman abanman@hpe.com

[ Upstream commit 1b17c6df852851b40c3c27c66b8fa2fd99cf25d8 ]

Writing to the software acknowledge clear register when there are no pending messages causes a HUB error to assert. The original intent of this write was to clear the pending bits before start of operation, but this is an incorrect method and has been determined to be unnecessary.

Signed-off-by: Andrew Banman abanman@hpe.com Acked-by: Mike Travis mike.travis@hpe.com Cc: Andy Lutomirski luto@kernel.org Cc: Borislav Petkov bp@alien8.de Cc: Brian Gerst brgerst@gmail.com Cc: Denys Vlasenko dvlasenk@redhat.com Cc: H. Peter Anvin hpa@zytor.com Cc: Josh Poimboeuf jpoimboe@redhat.com Cc: Linus Torvalds torvalds@linux-foundation.org Cc: Peter Zijlstra peterz@infradead.org Cc: Thomas Gleixner tglx@linutronix.de Cc: akpm@linux-foundation.org Cc: rja@hpe.com Cc: sivanich@hpe.com Link: http://lkml.kernel.org/r/1487351269-181133-1-git-send-email-abanman@hpe.com Signed-off-by: Ingo Molnar mingo@kernel.org Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/x86/platform/uv/tlb_uv.c | 1 - 1 file changed, 1 deletion(-)

--- a/arch/x86/platform/uv/tlb_uv.c +++ b/arch/x86/platform/uv/tlb_uv.c @@ -1848,7 +1848,6 @@ static void pq_init(int node, int pnode)

ops.write_payload_first(pnode, first); ops.write_payload_last(pnode, last); - ops.write_g_sw_ack(pnode, 0xffffUL);

/* in effect, all msg_type's are set to MSG_NOOP */ memset(pqp, 0, sizeof(struct bau_pq_entry) * DEST_Q_SIZE);

Patches currently in stable-queue which might be from abanman@hpe.com are

queue-4.9/x86-platform-uv-bau-fix-hub-errors-by-remove-initial-write-to-sw-ack-register.patch