4.14-stable review patch. If anyone has any objections, please let me know.
------------------ From: Huacai Chen <[email protected]> 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 <[email protected]> Signed-off-by: Huacai Chen <[email protected]> Signed-off-by: Paul Burton <[email protected]> Patchwork: https://patchwork.linux-mips.org/patch/21135/ Cc: Ralf Baechle <[email protected]> Cc: James Hogan <[email protected]> Cc: Steven J . Hill <[email protected]> Cc: [email protected] Cc: Fuxin Zhang <[email protected]> Cc: Zhangjin Wu <[email protected]> Cc: <[email protected]> # 3.8+ Signed-off-by: Greg Kroah-Hartman <[email protected]> --- 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 @@ -271,6 +271,11 @@ 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; }
