From: Christophe Leroy <christophe.leroy@csgroup.eu> To: Benjamin Herrenschmidt <benh@kernel.crashing.org>, Paul Mackerras <paulus@samba.org>, Michael Ellerman <mpe@ellerman.id.au>, Will Deacon <will@kernel.org>, Andrew Morton <akpm@linux-foundation.org>, "Peter Zijlstra (Intel)" <peterz@infradead.org> Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org Subject: [PATCH 1/3] mm/gup: Use huge_ptep_get() in gup_hugepte() Date: Mon, 15 Jun 2020 12:57:57 +0000 (UTC) [thread overview] Message-ID: <ffc3714334c3bfaca6f13788ad039e8759ae413f.1592225558.git.christophe.leroy@csgroup.eu> (raw) In-Reply-To: <cover.1592225557.git.christophe.leroy@csgroup.eu> gup_hugepte() reads hugepage table entries, it can't read them directly, huge_ptep_get() must be used. Fixes: 2ab3a0a02905 ("READ_ONCE: Enforce atomicity for {READ,WRITE}_ONCE() memory accesses") Cc: Will Deacon <will@kernel.org> Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> --- mm/gup.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/gup.c b/mm/gup.c index de9e36262ccb..761df4944ef5 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -2425,7 +2425,7 @@ static int gup_hugepte(pte_t *ptep, unsigned long sz, unsigned long addr, if (pte_end < end) end = pte_end; - pte = READ_ONCE(*ptep); + pte = huge_ptep_get(ptep); if (!pte_access_permitted(pte, flags & FOLL_WRITE)) return 0; -- 2.25.0
WARNING: multiple messages have this Message-ID (diff)
From: Christophe Leroy <christophe.leroy@csgroup.eu> To: Benjamin Herrenschmidt <benh@kernel.crashing.org>, Paul Mackerras <paulus@samba.org>, Michael Ellerman <mpe@ellerman.id.au>, Will Deacon <will@kernel.org>, Andrew Morton <akpm@linux-foundation.org>, "Peter Zijlstra (Intel)" <peterz@infradead.org> Cc: linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Subject: [PATCH 1/3] mm/gup: Use huge_ptep_get() in gup_hugepte() Date: Mon, 15 Jun 2020 12:57:57 +0000 (UTC) [thread overview] Message-ID: <ffc3714334c3bfaca6f13788ad039e8759ae413f.1592225558.git.christophe.leroy@csgroup.eu> (raw) In-Reply-To: <cover.1592225557.git.christophe.leroy@csgroup.eu> gup_hugepte() reads hugepage table entries, it can't read them directly, huge_ptep_get() must be used. Fixes: 2ab3a0a02905 ("READ_ONCE: Enforce atomicity for {READ,WRITE}_ONCE() memory accesses") Cc: Will Deacon <will@kernel.org> Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> --- mm/gup.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/gup.c b/mm/gup.c index de9e36262ccb..761df4944ef5 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -2425,7 +2425,7 @@ static int gup_hugepte(pte_t *ptep, unsigned long sz, unsigned long addr, if (pte_end < end) end = pte_end; - pte = READ_ONCE(*ptep); + pte = huge_ptep_get(ptep); if (!pte_access_permitted(pte, flags & FOLL_WRITE)) return 0; -- 2.25.0
next prev parent reply other threads:[~2020-06-15 12:58 UTC|newest] Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-06-15 12:57 [PATCH 0/3] Fix build failure with v5.8-rc1 Christophe Leroy 2020-06-15 12:57 ` Christophe Leroy 2020-06-15 12:57 ` Christophe Leroy [this message] 2020-06-15 12:57 ` [PATCH 1/3] mm/gup: Use huge_ptep_get() in gup_hugepte() Christophe Leroy 2020-06-17 14:14 ` Michael Ellerman 2020-06-17 14:14 ` Michael Ellerman 2020-06-15 12:57 ` [PATCH 2/3] mm: Allow arches to provide ptep_get() Christophe Leroy 2020-06-15 12:57 ` Christophe Leroy 2020-06-15 12:57 ` [PATCH 3/3] powerpc/8xx: Provide ptep_get() with 16k pages Christophe Leroy 2020-06-15 12:57 ` Christophe Leroy 2020-06-15 13:22 ` Peter Zijlstra 2020-06-15 13:22 ` Peter Zijlstra 2020-06-17 14:21 ` Michael Ellerman 2020-06-17 14:21 ` Michael Ellerman 2020-06-17 14:38 ` Peter Zijlstra 2020-06-17 14:38 ` Peter Zijlstra 2020-06-17 14:45 ` Christophe Leroy 2020-06-17 14:45 ` Christophe Leroy 2020-06-18 1:00 ` Michael Ellerman 2020-06-18 1:00 ` Michael Ellerman 2020-06-18 14:19 ` Christophe Leroy 2020-06-18 14:19 ` Christophe Leroy 2020-06-18 0:58 ` Michael Ellerman 2020-06-18 0:58 ` Michael Ellerman 2020-06-18 14:21 ` Christophe Leroy 2020-06-18 14:21 ` Christophe Leroy 2020-06-17 10:57 ` [PATCH 0/3] Fix build failure with v5.8-rc1 Will Deacon 2020-06-17 10:57 ` Will Deacon 2020-06-17 14:13 ` Michael Ellerman 2020-06-17 14:13 ` Michael Ellerman 2020-06-18 12:37 ` Michael Ellerman 2020-06-18 12:37 ` Michael Ellerman
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