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[99.254.121.117]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-44f5b83f632sm53071651cf.85.2024.07.17.15.02.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 17 Jul 2024 15:02:25 -0700 (PDT) From: Peter Xu To: linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH RFC 2/6] mm: PGTABLE_HAS_P[MU]D_LEAVES config options Date: Wed, 17 Jul 2024 18:02:15 -0400 Message-ID: <20240717220219.3743374-3-peterx@redhat.com> X-Mailer: git-send-email 2.45.0 In-Reply-To: <20240717220219.3743374-1-peterx@redhat.com> References: <20240717220219.3743374-1-peterx@redhat.com> MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arm-kernel@lists.infradead.org, linux-s390@vger.kernel.org, Alistair Popple , Ryan Roberts , David Hildenbrand , x86@kernel.org, Hugh Dickins , peterx@redhat.com, Michal Hocko , Alex Williamson , linux-riscv@lists.infradead.org, Matthew Wilcox , Jason Gunthorpe , sparclinux@vger.kernel.org, Axel Rasmussen , Andrew Morton , linuxppc-dev@lists.ozlabs.org, Dan Williams , Vlastimil Babka , Oscar Salvador Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" Introduce two more sub-options for PGTABLE_HAS_HUGE_LEAVES: - PGTABLE_HAS_PMD_LEAVES: set when there can be PMD mappings - PGTABLE_HAS_PUD_LEAVES: set when there can be PUD mappings It will help to identify whether the current build may only want PMD helpers but not PUD ones, as these sub-options will also check against the arch support over HAVE_ARCH_TRANSPARENT_HUGEPAGE[_PUD]. Note that having them depend on HAVE_ARCH_TRANSPARENT_HUGEPAGE[_PUD] is still some intermediate step. The best way is to have an option say "whether arch XXX supports PMD/PUD mappings" and so on. However let's leave that for later as that's the easy part. So far, we use these options to stably detect per-arch huge mapping support. Signed-off-by: Peter Xu --- include/linux/huge_mm.h | 10 +++++++--- mm/Kconfig | 6 ++++++ 2 files changed, 13 insertions(+), 3 deletions(-) diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h index 711632df7edf..37482c8445d1 100644 --- a/include/linux/huge_mm.h +++ b/include/linux/huge_mm.h @@ -96,14 +96,18 @@ extern struct kobj_attribute thpsize_shmem_enabled_attr; #define thp_vma_allowable_order(vma, vm_flags, tva_flags, order) \ (!!thp_vma_allowable_orders(vma, vm_flags, tva_flags, BIT(order))) -#ifdef CONFIG_PGTABLE_HAS_HUGE_LEAVES -#define HPAGE_PMD_SHIFT PMD_SHIFT +#ifdef CONFIG_PGTABLE_HAS_PUD_LEAVES #define HPAGE_PUD_SHIFT PUD_SHIFT #else -#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; }) #define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; }) #endif +#ifdef CONFIG_PGTABLE_HAS_PMD_LEAVES +#define HPAGE_PMD_SHIFT PMD_SHIFT +#else +#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; }) +#endif + #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT) #define HPAGE_PMD_NR (1<