4.4-stable review patch. If anyone has any objections, please let me know.
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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; }