From: Toshi Kani <toshi.k...@hp.com> Add pgprot_writethrough() for setting page protection flags to Write-Through mode.
Signed-off-by: Toshi Kani <toshi.k...@hp.com> Cc: Andrew Morton <a...@linux-foundation.org> Cc: Andy Lutomirski <l...@amacapital.net> Cc: a...@arndb.de Cc: elli...@hp.com Cc: h...@lst.de Cc: h...@hmh.eng.br Cc: H. Peter Anvin <h...@zytor.com> Cc: Ingo Molnar <mi...@redhat.com> Cc: jgr...@suse.com Cc: konrad.w...@oracle.com Cc: linux-mm <linux...@kvack.org> Cc: linux-nvd...@lists.01.org Cc: Luis R. Rodriguez <mcg...@suse.com> Cc: stefan.ba...@canonical.com Cc: x86-ml <x...@kernel.org> Cc: yi...@plexistor.com Link: http://lkml.kernel.org/r/1433187393-22688-8-git-send-email-toshi.k...@hp.com Signed-off-by: Borislav Petkov <b...@suse.de> --- arch/x86/include/asm/pgtable_types.h | 3 +++ arch/x86/mm/pat.c | 7 +++++++ include/asm-generic/pgtable.h | 4 ++++ 3 files changed, 14 insertions(+) diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h index 78f0c8cbe316..13f310bfc09a 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 6311193fd1a2..076187c76d7a 100644 --- a/arch/x86/mm/pat.c +++ b/arch/x86/mm/pat.c @@ -1000,6 +1000,13 @@ pgprot_t pgprot_writecombine(pgprot_t prot) } EXPORT_SYMBOL_GPL(pgprot_writecombine); +pgprot_t pgprot_writethrough(pgprot_t prot) +{ + return __pgprot(pgprot_val(prot) | + cachemode2protval(_PAGE_CACHE_MODE_WT)); +} +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 39f1d6a2b04d..bd910ceaccfa 100644 --- a/include/asm-generic/pgtable.h +++ b/include/asm-generic/pgtable.h @@ -262,6 +262,10 @@ 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 -- 2.3.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
