From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg0-f71.google.com (mail-pg0-f71.google.com [74.125.83.71]) by kanga.kvack.org (Postfix) with ESMTP id 562F4681047 for ; Fri, 17 Feb 2017 09:14:02 -0500 (EST) Received: by mail-pg0-f71.google.com with SMTP id d185so61483878pgc.2 for ; Fri, 17 Feb 2017 06:14:02 -0800 (PST) Received: from mga11.intel.com (mga11.intel.com. [192.55.52.93]) by mx.google.com with ESMTPS id y7si10377833pgb.374.2017.02.17.06.14.01 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 17 Feb 2017 06:14:01 -0800 (PST) From: "Kirill A. Shutemov" Subject: [PATCHv3 17/33] x86/kasan: prepare clear_pgds() to switch to Date: Fri, 17 Feb 2017 17:13:12 +0300 Message-Id: <20170217141328.164563-18-kirill.shutemov@linux.intel.com> In-Reply-To: <20170217141328.164563-1-kirill.shutemov@linux.intel.com> References: <20170217141328.164563-1-kirill.shutemov@linux.intel.com> Sender: owner-linux-mm@kvack.org List-ID: To: Linus Torvalds , Andrew Morton , x86@kernel.org, Thomas Gleixner , Ingo Molnar , Arnd Bergmann , "H. Peter Anvin" Cc: Andi Kleen , Dave Hansen , Andy Lutomirski , linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" , Dmitry Vyukov With folded p4d, pgd_clear() is nop. Change clear_pgds() to use p4d_clear() instead. Signed-off-by: Kirill A. Shutemov Cc: Dmitry Vyukov --- arch/x86/mm/kasan_init_64.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/arch/x86/mm/kasan_init_64.c b/arch/x86/mm/kasan_init_64.c index 0493c17b8a51..72ffe4c55c2d 100644 --- a/arch/x86/mm/kasan_init_64.c +++ b/arch/x86/mm/kasan_init_64.c @@ -31,8 +31,15 @@ static int __init map_range(struct range *range) static void __init clear_pgds(unsigned long start, unsigned long end) { - for (; start < end; start += PGDIR_SIZE) - pgd_clear(pgd_offset_k(start)); + pgd_t *pgd; + + for (; start < end; start += PGDIR_SIZE) { + pgd = pgd_offset_k(start); + if (CONFIG_PGTABLE_LEVELS < 5) + p4d_clear(p4d_offset(pgd, start)); + else + pgd_clear(pgd); + } } static void __init kasan_map_early_shadow(pgd_t *pgd) -- 2.11.0 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org