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[209.85.220.65]) by mx.google.com with SMTPS id 3sor11203805plo.62.2019.06.30.23.41.01 for (Google Transport Security); Sun, 30 Jun 2019 23:41:01 -0700 (PDT) Received-SPF: pass (google.com: domain of npiggin@gmail.com designates 209.85.220.65 as permitted sender) client-ip=209.85.220.65; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=bizikAVg; spf=pass (google.com: domain of npiggin@gmail.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=npiggin@gmail.com; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=smDmHv6fTQfEC2Xw13QJ3CuxW2VIYrqrjOiGuS7E8nY=; b=bizikAVg98c+yn3J0ciWcHUsmX+eyH5Ec+Sx1ENDwBE32Rx/0lg8b1PCfc37WCUEDP jvLHutEpkCjCeKIF+3OCxCQD2xwfD1eqZv22X/0xYJQ2gfkR6T5h9U/i3UGWyxnopCfA Lc9xD+81BMSV0KJwxT6Zl8kgkeypStm0C7tCePD/8Phv4vhKKMSzIoSCKbqq4aQcXAk2 zSivyt8fYuQ9m/IJ5Iloms2K0emcTQysfKlLQHpo7SvscAXV2YkufHhBN7FSL1dpYBzJ hW4BMvvO1kSJHQ22hVPW5au0hnygWqK2g/+kZgrcqWqf4S6z9Rb8Swfe1cQTUPSpss9b XiSA== X-Google-Smtp-Source: APXvYqxC3bQxXqpIe85UilgRlX3q9ASs816UdqitUsnjCUP/RYiNALnXskGWa2IYqd1xwqXJJ9Kx/Q== X-Received: by 2002:a17:902:d887:: with SMTP id b7mr27095942plz.28.1561963261105; Sun, 30 Jun 2019 23:41:01 -0700 (PDT) Received: from bobo.ozlabs.ibm.com ([122.99.82.10]) by smtp.gmail.com with ESMTPSA id x128sm24238285pfd.17.2019.06.30.23.40.57 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Sun, 30 Jun 2019 23:41:00 -0700 (PDT) From: Nicholas Piggin To: "linux-mm @ kvack . org" Cc: Nicholas Piggin , "linux-arm-kernel @ lists . infradead . org" , "linuxppc-dev @ lists . ozlabs . org" , Andrew Morton , Anshuman Khandual , Christophe Leroy , Ard Biesheuvel , Mark Rutland Subject: [PATCH v2 3/3] mm/vmalloc: fix vmalloc_to_page for huge vmap mappings Date: Mon, 1 Jul 2019 16:40:26 +1000 Message-Id: <20190701064026.970-4-npiggin@gmail.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190701064026.970-1-npiggin@gmail.com> References: <20190701064026.970-1-npiggin@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: vmalloc_to_page returns NULL for addresses mapped by larger pages[*]. Whether or not a vmap is huge depends on the architecture details, alignments, boot options, etc., which the caller can not be expected to know. Therefore HUGE_VMAP is a regression for vmalloc_to_page. This change teaches vmalloc_to_page about larger pages, and returns the struct page that corresponds to the offset within the large page. This makes the API agnostic to mapping implementation details. [*] As explained by commit 029c54b095995 ("mm/vmalloc.c: huge-vmap: fail gracefully on unexpected huge vmap mappings") Signed-off-by: Nicholas Piggin --- include/asm-generic/4level-fixup.h | 1 + include/asm-generic/5level-fixup.h | 1 + mm/vmalloc.c | 37 +++++++++++++++++++----------- 3 files changed, 26 insertions(+), 13 deletions(-) diff --git a/include/asm-generic/4level-fixup.h b/include/asm-generic/4level-fixup.h index e3667c9a33a5..3cc65a4dd093 100644 --- a/include/asm-generic/4level-fixup.h +++ b/include/asm-generic/4level-fixup.h @@ -20,6 +20,7 @@ #define pud_none(pud) 0 #define pud_bad(pud) 0 #define pud_present(pud) 1 +#define pud_large(pud) 0 #define pud_ERROR(pud) do { } while (0) #define pud_clear(pud) pgd_clear(pud) #define pud_val(pud) pgd_val(pud) diff --git a/include/asm-generic/5level-fixup.h b/include/asm-generic/5level-fixup.h index bb6cb347018c..c4377db09a4f 100644 --- a/include/asm-generic/5level-fixup.h +++ b/include/asm-generic/5level-fixup.h @@ -22,6 +22,7 @@ #define p4d_none(p4d) 0 #define p4d_bad(p4d) 0 #define p4d_present(p4d) 1 +#define p4d_large(p4d) 0 #define p4d_ERROR(p4d) do { } while (0) #define p4d_clear(p4d) pgd_clear(p4d) #define p4d_val(p4d) pgd_val(p4d) diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 0f76cca32a1c..09a283866368 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -36,6 +36,7 @@ #include #include +#include #include #include @@ -284,25 +285,35 @@ struct page *vmalloc_to_page(const void *vmalloc_addr) if (pgd_none(*pgd)) return NULL; + p4d = p4d_offset(pgd, addr); if (p4d_none(*p4d)) return NULL; - pud = pud_offset(p4d, addr); +#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP + if (p4d_large(*p4d)) + return p4d_page(*p4d) + ((addr & ~P4D_MASK) >> PAGE_SHIFT); +#endif + if (WARN_ON_ONCE(p4d_bad(*p4d))) + return NULL; - /* - * Don't dereference bad PUD or PMD (below) entries. This will also - * identify huge mappings, which we may encounter on architectures - * that define CONFIG_HAVE_ARCH_HUGE_VMAP=y. Such regions will be - * identified as vmalloc addresses by is_vmalloc_addr(), but are - * not [unambiguously] associated with a struct page, so there is - * no correct value to return for them. - */ - WARN_ON_ONCE(pud_bad(*pud)); - if (pud_none(*pud) || pud_bad(*pud)) + pud = pud_offset(p4d, addr); + if (pud_none(*pud)) + return NULL; +#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP + if (pud_large(*pud)) + return pud_page(*pud) + ((addr & ~PUD_MASK) >> PAGE_SHIFT); +#endif + if (WARN_ON_ONCE(pud_bad(*pud))) return NULL; + pmd = pmd_offset(pud, addr); - WARN_ON_ONCE(pmd_bad(*pmd)); - if (pmd_none(*pmd) || pmd_bad(*pmd)) + if (pmd_none(*pmd)) + return NULL; +#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP + if (pmd_large(*pmd)) + return pmd_page(*pmd) + ((addr & ~PMD_MASK) >> PAGE_SHIFT); +#endif + if (WARN_ON_ONCE(pmd_bad(*pmd))) return NULL; ptep = pte_offset_map(pmd, addr); -- 2.20.1