From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sasha Levin Subject: [PATCH AUTOSEL 4.14 61/95] mm: introduce mm_[p4d|pud|pmd]_folded Date: Tue, 7 May 2019 01:37:50 -0400 Message-ID: <20190507053826.31622-61-sashal@kernel.org> References: <20190507053826.31622-1-sashal@kernel.org> Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Return-path: In-Reply-To: <20190507053826.31622-1-sashal@kernel.org> Sender: linux-kernel-owner@vger.kernel.org To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Martin Schwidefsky , "Kirill A . Shutemov" , Sasha Levin , linux-arch@vger.kernel.org List-Id: linux-arch.vger.kernel.org From: Martin Schwidefsky [ Upstream commit 1071fc5779d9846fec56a4ff6089ab08cac1ab72 ] Add three architecture overrideable functions to test if the p4d, pud, or pmd layer of a page table is folded or not. Acked-by: Kirill A. Shutemov Signed-off-by: Martin Schwidefsky Signed-off-by: Sasha Levin --- include/asm-generic/pgtable.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h index f00421dfacbd..0c21014a38f2 100644 --- a/include/asm-generic/pgtable.h +++ b/include/asm-generic/pgtable.h @@ -1081,4 +1081,20 @@ static inline bool arch_has_pfn_modify_check(void) #endif #endif +/* + * On some architectures it depends on the mm if the p4d/pud or pmd + * layer of the page table hierarchy is folded or not. + */ +#ifndef mm_p4d_folded +#define mm_p4d_folded(mm) __is_defined(__PAGETABLE_P4D_FOLDED) +#endif + +#ifndef mm_pud_folded +#define mm_pud_folded(mm) __is_defined(__PAGETABLE_PUD_FOLDED) +#endif + +#ifndef mm_pmd_folded +#define mm_pmd_folded(mm) __is_defined(__PAGETABLE_PMD_FOLDED) +#endif + #endif /* _ASM_GENERIC_PGTABLE_H */ -- 2.20.1