From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-yh0-f52.google.com (mail-yh0-f52.google.com [209.85.213.52]) by kanga.kvack.org (Postfix) with ESMTP id A0C066B003B for ; Tue, 15 Jul 2014 15:45:00 -0400 (EDT) Received: by mail-yh0-f52.google.com with SMTP id t59so1677210yho.25 for ; Tue, 15 Jul 2014 12:45:00 -0700 (PDT) Received: from g6t1526.atlanta.hp.com (g6t1526.atlanta.hp.com. [15.193.200.69]) by mx.google.com with ESMTPS id a59si26056000yhg.103.2014.07.15.12.45.00 for (version=TLSv1 cipher=RC4-SHA bits=128/128); Tue, 15 Jul 2014 12:45:00 -0700 (PDT) From: Toshi Kani Subject: [RFC PATCH 6/11] x86, mm, pat: Add pgprot_writethrough() for WT Date: Tue, 15 Jul 2014 13:34:39 -0600 Message-Id: <1405452884-25688-7-git-send-email-toshi.kani@hp.com> In-Reply-To: <1405452884-25688-1-git-send-email-toshi.kani@hp.com> References: <1405452884-25688-1-git-send-email-toshi.kani@hp.com> Sender: owner-linux-mm@kvack.org List-ID: To: hpa@zytor.com, tglx@linutronix.de, mingo@redhat.com, akpm@linux-foundation.org, arnd@arndb.de, konrad.wilk@oracle.com, plagnioj@jcrosoft.com, tomi.valkeinen@ti.com Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, stefan.bader@canonical.com, luto@amacapital.net, airlied@gmail.com, bp@alien8.de, Toshi Kani This patch introduces pgprot_writethrough() for setting the WT type for a given pgprot_t. Signed-off-by: Toshi Kani --- arch/x86/include/asm/pgtable_types.h | 3 +++ arch/x86/mm/pat.c | 9 +++++++++ include/asm-generic/pgtable.h | 4 ++++ 3 files changed, 16 insertions(+) diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h index 7b905cb..1fe8af7 100644 --- a/arch/x86/include/asm/pgtable_types.h +++ b/arch/x86/include/asm/pgtable_types.h @@ -343,6 +343,9 @@ extern int nx_enabled; #define pgprot_writecombine pgprot_writecombine extern pgprot_t pgprot_writecombine(pgprot_t prot); +#define pgprot_writethrough pgprot_writethrough +extern pgprot_t pgprot_writethrough(pgprot_t prot); + /* Indicate that x86 has its own track and untrack pfn vma functions */ #define __HAVE_PFNMAP_TRACKING diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c index 8a8be17..a987071 100644 --- a/arch/x86/mm/pat.c +++ b/arch/x86/mm/pat.c @@ -796,6 +796,15 @@ pgprot_t pgprot_writecombine(pgprot_t prot) } EXPORT_SYMBOL_GPL(pgprot_writecombine); +pgprot_t pgprot_writethrough(pgprot_t prot) +{ + if (pat_enabled) + return __pgprot(pgprot_val(prot) | _PAGE_CACHE_WT); + else + return pgprot_noncached(prot); +} +EXPORT_SYMBOL_GPL(pgprot_writethrough); + #if defined(CONFIG_DEBUG_FS) && defined(CONFIG_X86_PAT) static struct memtype *memtype_get_idx(loff_t pos) diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h index 53b2acc..1af0ed9 100644 --- a/include/asm-generic/pgtable.h +++ b/include/asm-generic/pgtable.h @@ -249,6 +249,10 @@ static inline int pmd_same(pmd_t pmd_a, pmd_t pmd_b) #define pgprot_writecombine pgprot_noncached #endif +#ifndef pgprot_writethrough +#define pgprot_writethrough pgprot_noncached +#endif + /* * When walking page tables, get the address of the next boundary, * or the end address of the range if that comes earlier. Although no -- 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