Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753169AbbBYAQ6 (ORCPT ); Tue, 24 Feb 2015 19:16:58 -0500 Received: from g4t3425.houston.hp.com ([15.201.208.53]:46553 "EHLO g4t3425.houston.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752966AbbBYAPo (ORCPT ); Tue, 24 Feb 2015 19:15:44 -0500 From: Toshi Kani To: hpa@zytor.com, tglx@linutronix.de, mingo@redhat.com, akpm@linux-foundation.org, arnd@arndb.de Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, jgross@suse.com, stefan.bader@canonical.com, luto@amacapital.net, hmh@hmh.eng.br, yigal@plexistor.com, konrad.wilk@oracle.com, Elliott@hp.com, Toshi Kani Subject: [PATCH v8 4/7] x86, mm, pat: Add pgprot_writethrough() for WT Date: Tue, 24 Feb 2015 17:14:58 -0700 Message-Id: <1424823301-30927-5-git-send-email-toshi.kani@hp.com> X-Mailer: git-send-email 1.9.3 In-Reply-To: <1424823301-30927-1-git-send-email-toshi.kani@hp.com> References: <1424823301-30927-1-git-send-email-toshi.kani@hp.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2236 Lines: 66 This patch adds pgprot_writethrough() for setting WT to a given pgprot_t. Signed-off-by: Toshi Kani Reviewed-by: Konrad Rzeszutek Wilk --- arch/x86/include/asm/pgtable_types.h | 3 +++ arch/x86/mm/pat.c | 10 ++++++++++ include/asm-generic/pgtable.h | 4 ++++ 3 files changed, 17 insertions(+) diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h index 8c7c108..e962f06 100644 --- a/arch/x86/include/asm/pgtable_types.h +++ b/arch/x86/include/asm/pgtable_types.h @@ -367,6 +367,9 @@ 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 b4db0d8..d3f7058 100644 --- a/arch/x86/mm/pat.c +++ b/arch/x86/mm/pat.c @@ -972,6 +972,16 @@ 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) | + cachemode2protval(_PAGE_CACHE_MODE_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 4d46085..d1e59a4 100644 --- a/include/asm-generic/pgtable.h +++ b/include/asm-generic/pgtable.h @@ -256,6 +256,10 @@ 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 + #ifndef pgprot_device #define pgprot_device pgprot_noncached #endif -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/