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    Subject[tip:x86/mm] x86/mm/pat: Add pgprot_writethrough()
    Commit-ID:  d1b4bfbfac32da43bfc8425be1c4303548e20527
    Gitweb: http://git.kernel.org/tip/d1b4bfbfac32da43bfc8425be1c4303548e20527
    Author: Toshi Kani <toshi.kani@hp.com>
    AuthorDate: Thu, 4 Jun 2015 18:55:18 +0200
    Committer: Ingo Molnar <mingo@kernel.org>
    CommitDate: Sun, 7 Jun 2015 15:28:58 +0200

    x86/mm/pat: Add pgprot_writethrough()

    Add pgprot_writethrough() for setting page protection flags to
    Write-Through mode.

    Signed-off-by: Toshi Kani <toshi.kani@hp.com>
    Signed-off-by: Borislav Petkov <bp@suse.de>
    Cc: Andrew Morton <akpm@linux-foundation.org>
    Cc: Andy Lutomirski <luto@amacapital.net>
    Cc: Elliott@hp.com
    Cc: H. Peter Anvin <hpa@zytor.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Luis R. Rodriguez <mcgrof@suse.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: arnd@arndb.de
    Cc: hch@lst.de
    Cc: hmh@hmh.eng.br
    Cc: jgross@suse.com
    Cc: konrad.wilk@oracle.com
    Cc: linux-mm <linux-mm@kvack.org>
    Cc: linux-nvdimm@lists.01.org
    Cc: stefan.bader@canonical.com
    Cc: yigal@plexistor.com
    Link: http://lkml.kernel.org/r/1433436928-31903-11-git-send-email-bp@alien8.de
    Signed-off-by: Ingo Molnar <mingo@kernel.org>
    ---
    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 78f0c8c..13f310b 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 6311193..076187c 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 39f1d6a..bd910ce 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

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