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Date: Wed, 10 Sep 2014 10:51:49 -0600 From: Toshi Kani <toshi.kani@...com> To: hpa@...or.com, tglx@...utronix.de, mingo@...hat.com, akpm@...ux-foundation.org, arnd@...db.de Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org, jgross@...e.com, stefan.bader@...onical.com, luto@...capital.net, hmh@....eng.br, yigal@...xistor.com, konrad.wilk@...cle.com, Toshi Kani <toshi.kani@...com> Subject: [PATCH v2 5/6] x86, mm, pat: Add pgprot_writethrough() for WT This patch adds pgprot_writethrough() for setting WT to a given pgprot_t. Signed-off-by: Toshi Kani <toshi.kani@...com> --- 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 bd2f50f..cc7c65d 100644 --- a/arch/x86/include/asm/pgtable_types.h +++ b/arch/x86/include/asm/pgtable_types.h @@ -394,6 +394,9 @@ 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 7644967..97aab95 100644 --- a/arch/x86/mm/pat.c +++ b/arch/x86/mm/pat.c @@ -875,6 +875,16 @@ 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 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 from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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