lkml.org 
[lkml]   [2019]   [Jan]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 4.4 51/88] MIPS: Ensure pmd_present() returns false after pmd_mknotpresent()
    Date
    4.4-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Huacai Chen <chenhc@lemote.com>

    commit 92aa0718c9fa5160ad2f0e7b5bffb52f1ea1e51a upstream.

    This patch is borrowed from ARM64 to ensure pmd_present() returns false
    after pmd_mknotpresent(). This is needed for THP.

    References: 5bb1cc0ff9a6 ("arm64: Ensure pmd_present() returns false after pmd_mknotpresent()")
    Reviewed-by: James Hogan <jhogan@kernel.org>
    Signed-off-by: Huacai Chen <chenhc@lemote.com>
    Signed-off-by: Paul Burton <paul.burton@mips.com>
    Patchwork: https://patchwork.linux-mips.org/patch/21135/
    Cc: Ralf Baechle <ralf@linux-mips.org>
    Cc: James Hogan <james.hogan@mips.com>
    Cc: Steven J . Hill <Steven.Hill@cavium.com>
    Cc: linux-mips@linux-mips.org
    Cc: Fuxin Zhang <zhangfx@lemote.com>
    Cc: Zhangjin Wu <wuzhangjin@gmail.com>
    Cc: <stable@vger.kernel.org> # 3.8+
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    arch/mips/include/asm/pgtable-64.h | 5 +++++
    1 file changed, 5 insertions(+)

    --- a/arch/mips/include/asm/pgtable-64.h
    +++ b/arch/mips/include/asm/pgtable-64.h
    @@ -189,6 +189,11 @@ static inline int pmd_bad(pmd_t pmd)

    static inline int pmd_present(pmd_t pmd)
    {
    +#ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
    + if (unlikely(pmd_val(pmd) & _PAGE_HUGE))
    + return pmd_val(pmd) & _PAGE_PRESENT;
    +#endif
    +
    return pmd_val(pmd) != (unsigned long) invalid_pte_table;
    }


    \
     
     \ /
      Last update: 2019-01-11 15:22    [W:4.225 / U:0.120 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site