From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dave Kleikamp , Bob Picco , "David S. Miller" Subject: [ 12/45] sparc: tsb must be flushed before tlb Date: Fri, 26 Jul 2013 13:57:32 -0700 Message-Id: <20130726205656.276917432@linuxfoundation.org> In-Reply-To: <20130726205654.896050165@linuxfoundation.org> References: <20130726205654.896050165@linuxfoundation.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.0-stable review patch. If anyone has any objections, please let me know. ------------------ From: Dave Kleikamp This fixes a race where a cpu may re-load a tlb from a stale tsb right after it has been flushed by a remote function call. I still see some instability when stressing the system with parallel kernel builds while creating memory pressure by writing to /proc/sys/vm/nr_hugepages, but this patch improves the stability significantly. Signed-off-by: Dave Kleikamp Acked-by: Bob Picco Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- arch/sparc/mm/tlb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/sparc/mm/tlb.c +++ b/arch/sparc/mm/tlb.c @@ -115,8 +115,8 @@ no_cache_flush: } if (!tb->active) { - global_flush_tlb_page(mm, vaddr); flush_tsb_user_page(mm, vaddr); + global_flush_tlb_page(mm, vaddr); goto out; }