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MIPS: Ensure pmd_present() returns false after pmd_mknotpresent()

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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>
This commit is contained in:
Huacai Chen 2018-11-15 15:53:54 +08:00 • committed by Greg Kroah-Hartman
parent c2b02f925a
commit 79d02189e7
1 changed files with 5 additions and 0 deletions
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5
arch/mips/include/asm/pgtable-64.h
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@ -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;
}