From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:40786 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751821AbeCYKHI (ORCPT ); Sun, 25 Mar 2018 06:07:08 -0400 Subject: Patch "x86/mm: implement free pmd/pte page interfaces" has been added to the 4.15-stable tree To: toshi.kani@hpe.com, akpm@linux-foundation.org, bp@suse.de, gregkh@linuxfoundation.org, hpa@zytor.com, lious.lilei@hisilicon.com, mhocko@suse.com, mingo@redhat.com, stable@vger.kernel.org, tglx@linutronix.de, torvalds@linux-foundation.org, willy@infradead.org Cc: , From: Date: Sun, 25 Mar 2018 12:05:42 +0200 Message-ID: <152197234224345@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 x86/mm: implement free pmd/pte page interfaces to the 4.15-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: x86-mm-implement-free-pmd-pte-page-interfaces.patch and it can be found in the queue-4.15 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From 28ee90fe6048fa7b7ceaeb8831c0e4e454a4cf89 Mon Sep 17 00:00:00 2001 From: Toshi Kani Date: Thu, 22 Mar 2018 16:17:24 -0700 Subject: x86/mm: implement free pmd/pte page interfaces From: Toshi Kani commit 28ee90fe6048fa7b7ceaeb8831c0e4e454a4cf89 upstream. Implement pud_free_pmd_page() and pmd_free_pte_page() on x86, which clear a given pud/pmd entry and free up lower level page table(s). The address range associated with the pud/pmd entry must have been purged by INVLPG. Link: http://lkml.kernel.org/r/20180314180155.19492-3-toshi.kani@hpe.com Fixes: e61ce6ade404e ("mm: change ioremap to set up huge I/O mappings") Signed-off-by: Toshi Kani Reported-by: Lei Li Cc: Michal Hocko Cc: Thomas Gleixner Cc: Ingo Molnar Cc: "H. Peter Anvin" Cc: Borislav Petkov Cc: Matthew Wilcox Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- arch/x86/mm/pgtable.c | 28 ++++++++++++++++++++++++++-- 1 file changed, 26 insertions(+), 2 deletions(-) --- a/arch/x86/mm/pgtable.c +++ b/arch/x86/mm/pgtable.c @@ -712,7 +712,22 @@ int pmd_clear_huge(pmd_t *pmd) */ int pud_free_pmd_page(pud_t *pud) { - return pud_none(*pud); + pmd_t *pmd; + int i; + + if (pud_none(*pud)) + return 1; + + pmd = (pmd_t *)pud_page_vaddr(*pud); + + for (i = 0; i < PTRS_PER_PMD; i++) + if (!pmd_free_pte_page(&pmd[i])) + return 0; + + pud_clear(pud); + free_page((unsigned long)pmd); + + return 1; } /** @@ -724,6 +739,15 @@ int pud_free_pmd_page(pud_t *pud) */ int pmd_free_pte_page(pmd_t *pmd) { - return pmd_none(*pmd); + pte_t *pte; + + if (pmd_none(*pmd)) + return 1; + + pte = (pte_t *)pmd_page_vaddr(*pmd); + pmd_clear(pmd); + free_page((unsigned long)pte); + + return 1; } #endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */ Patches currently in stable-queue which might be from toshi.kani@hpe.com are queue-4.15/mm-vmalloc-add-interfaces-to-free-unmapped-page-table.patch queue-4.15/x86-mm-implement-free-pmd-pte-page-interfaces.patch