From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:38866 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751189AbdGRHhD (ORCPT ); Tue, 18 Jul 2017 03:37:03 -0400 Subject: Patch "sparc64: Fix gup_huge_pmd" has been added to the 4.11-stable tree To: nitin.m.gupta@oracle.com, davem@davemloft.net, gregkh@linuxfoundation.org, julian.calaby@gmail.com Cc: , From: Date: Tue, 18 Jul 2017 09:36:47 +0200 Message-ID: <150036340775241@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: Fix gup_huge_pmd 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-fix-gup_huge_pmd.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 Tue Jul 18 09:36:36 CEST 2017 From: Nitin Gupta Date: Thu, 22 Jun 2017 17:15:08 -0700 Subject: sparc64: Fix gup_huge_pmd From: Nitin Gupta [ Upstream commit dbd2667a4fb9ce4f547982b07cd69dda127c47ea ] The function assumes that each PMD points to head of a huge page. This is not correct as a PMD can point to start of any 8M region with a, say 256M, hugepage. The fix ensures that it points to the correct head of any PMD huge page. Cc: Julian Calaby Signed-off-by: Nitin Gupta Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- arch/sparc/mm/gup.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/arch/sparc/mm/gup.c +++ b/arch/sparc/mm/gup.c @@ -78,8 +78,8 @@ static int gup_huge_pmd(pmd_t *pmdp, pmd return 0; refs = 0; - head = pmd_page(pmd); - page = head + ((addr & ~PMD_MASK) >> PAGE_SHIFT); + page = pmd_page(pmd) + ((addr & ~PMD_MASK) >> PAGE_SHIFT); + head = compound_head(page); do { VM_BUG_ON(compound_head(page) != head); pages[*nr] = page; Patches currently in stable-queue which might be from nitin.m.gupta@oracle.com are queue-4.11/sparc64-fix-gup_huge_pmd.patch