[0/2] couple of sparc 32 mm fixes

Message ID	20210616104534.1614087-1-npiggin@gmail.com
Headers	show Return-Path: <sparclinux-owner@vger.kernel.org> From: Nicholas Piggin <npiggin@gmail.com> To: "David S. Miller" <davem@davemloft.net> Cc: Nicholas Piggin <npiggin@gmail.com>, sparclinux@vger.kernel.org Subject: [PATCH 0/2] couple of sparc 32 mm fixes Date: Wed, 16 Jun 2021 20:45:32 +1000 Message-Id: <20210616104534.1614087-1-npiggin@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk
Series	couple of sparc 32 mm fixes \| expand [0/2] couple of sparc 32 mm fixes [1/2] sparc32: remove mm_cpumask clearing to fix kthread_use_mm race [2/2] sparc32: fix mm_cpumask maintenance causing missing TLB flushing

Message ID

20210616104534.1614087-1-npiggin@gmail.com

Headers

From: Nicholas Piggin <npiggin@gmail.com>
To: "David S. Miller" <davem@davemloft.net>
Cc: Nicholas Piggin <npiggin@gmail.com>, sparclinux@vger.kernel.org
Subject: [PATCH 0/2] couple of sparc 32 mm fixes
Date: Wed, 16 Jun 2021 20:45:32 +1000
Message-Id: <20210616104534.1614087-1-npiggin@gmail.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Series

couple of sparc 32 mm fixes | expand

Message

Nicholas Piggin June 16, 2021, 10:45 a.m. UTC

I was able to test patch 2 in SMP qemu and verify there were cases
where a cpu's active_mm does not have that CPU set in the mm_cpumask
before the patch, and do not observe it afterwards.

I haven't observed any actual corruption from the bugs, but I didn't
stress it much, and only what qemu can do.

Thanks,
Nick

Nicholas Piggin (2):
  sparc32: remove mm_cpumask clearing to fix kthread_use_mm race
  sparc32: fix mm_cpumask maintenance causing missing TLB flushing

 arch/sparc/include/asm/switch_to_32.h | 1 -
 arch/sparc/mm/srmmu.c                 | 9 ++++-----
 2 files changed, 4 insertions(+), 6 deletions(-)