On Wed, Sep 10, 2014 at 10:51:49AM -0600, Toshi Kani wrote: > This patch adds pgprot_writethrough() for setting WT to a given > pgprot_t. > > Signed-off-by: Toshi Kani <[email protected]>
Reviewed-by: Konrad Rzeszutek Wilk <[email protected]> > --- > 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 [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
