From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:59402 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751818AbdFHHAh (ORCPT ); Thu, 8 Jun 2017 03:00:37 -0400 Subject: Patch "sparc64: reset mm cpumask after wrap" has been added to the 4.11-stable tree To: pasha.tatashin@oracle.com, bob.picco@oracle.com, davem@davemloft.net, gregkh@linuxfoundation.org, steven.sistare@oracle.com Cc: , From: Date: Thu, 08 Jun 2017 08:59:22 +0200 Message-ID: <149690516296120@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled sparc64: reset mm cpumask after wrap to the 4.11-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: sparc64-reset-mm-cpumask-after-wrap.patch and it can be found in the queue-4.11 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From foo@baz Thu Jun 8 08:58:43 CEST 2017 From: Pavel Tatashin Date: Wed, 31 May 2017 11:25:20 -0400 Subject: sparc64: reset mm cpumask after wrap From: Pavel Tatashin [ Upstream commit 588974857359861891f478a070b1dc7ae04a3880 ] After a wrap (getting a new context version) a process must get a new context id, which means that we would need to flush the context id from the TLB before running for the first time with this ID on every CPU. But, we use mm_cpumask to determine if this process has been running on this CPU before, and this mask is not reset after a wrap. So, there are two possible fixes for this issue: 1. Clear mm cpumask whenever mm gets a new context id 2. Unconditionally flush context every time process is running on a CPU This patch implements the first solution Signed-off-by: Pavel Tatashin Reviewed-by: Bob Picco Reviewed-by: Steven Sistare Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- arch/sparc/mm/init_64.c | 2 ++ 1 file changed, 2 insertions(+) --- a/arch/sparc/mm/init_64.c +++ b/arch/sparc/mm/init_64.c @@ -759,6 +759,8 @@ void get_new_mmu_context(struct mm_struc goto out; } } + if (mm->context.sparc64_ctx_val) + cpumask_clear(mm_cpumask(mm)); mmu_context_bmap[new_ctx>>6] |= (1UL << (new_ctx & 63)); new_ctx |= (tlb_context_cache & CTX_VERSION_MASK); out: Patches currently in stable-queue which might be from pasha.tatashin@oracle.com are queue-4.11/sparc64-new-context-wrap.patch queue-4.11/sparc64-combine-activate_mm-and-switch_mm.patch queue-4.11/sparc64-add-per-cpu-mm-of-secondary-contexts.patch queue-4.11/sparc64-reset-mm-cpumask-after-wrap.patch queue-4.11/sparc64-redefine-first-version.patch queue-4.11/sparc64-delete-old-wrap-code.patch