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[73.69.118.222]) by smtp.gmail.com with ESMTPSA id q13sm10443332qkm.120.2019.08.21.11.32.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Aug 2019 11:32:18 -0700 (PDT) From: Pavel Tatashin To: pasha.tatashin@soleen.com, jmorris@namei.org, sashal@kernel.org, ebiederm@xmission.com, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, corbet@lwn.net, catalin.marinas@arm.com, will@kernel.org, linux-arm-kernel@lists.infradead.org, marc.zyngier@arm.com, james.morse@arm.com, vladimir.murzin@arm.com, matthias.bgg@gmail.com, bhsharma@redhat.com, linux-mm@kvack.org, mark.rutland@arm.com Subject: [PATCH v3 09/17] arm64, trans_pgd: add trans_pgd_create_empty Date: Wed, 21 Aug 2019 14:31:56 -0400 Message-Id: <20190821183204.23576-10-pasha.tatashin@soleen.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20190821183204.23576-1-pasha.tatashin@soleen.com> References: <20190821183204.23576-1-pasha.tatashin@soleen.com> MIME-Version: 1.0 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: This functions returns a zeroed trans_pgd using the allocator that is specified in the info argument. trans_pgds should be created by using this function. Signed-off-by: Pavel Tatashin --- arch/arm64/include/asm/trans_pgd.h | 3 +++ arch/arm64/kernel/hibernate.c | 6 +++--- arch/arm64/mm/trans_pgd.c | 12 ++++++++++++ 3 files changed, 18 insertions(+), 3 deletions(-) diff --git a/arch/arm64/include/asm/trans_pgd.h b/arch/arm64/include/asm/trans_pgd.h index e3d022b1b526..26e5a63676b5 100644 --- a/arch/arm64/include/asm/trans_pgd.h +++ b/arch/arm64/include/asm/trans_pgd.h @@ -40,6 +40,9 @@ struct trans_pgd_info { unsigned long trans_flags; }; +/* Create and empty trans_pgd page table */ +int trans_pgd_create_empty(struct trans_pgd_info *info, pgd_t **trans_pgd); + int trans_pgd_create_copy(pgd_t **dst_pgdp, unsigned long start, unsigned long end); diff --git a/arch/arm64/kernel/hibernate.c b/arch/arm64/kernel/hibernate.c index 17426dc8cb54..8c2641a9bb09 100644 --- a/arch/arm64/kernel/hibernate.c +++ b/arch/arm64/kernel/hibernate.c @@ -216,9 +216,9 @@ static int create_safe_exec_page(void *src_start, size_t length, memcpy(page, src_start, length); __flush_icache_range((unsigned long)page, (unsigned long)page + length); - trans_pgd = (void *)get_safe_page(GFP_ATOMIC); - if (!trans_pgd) - return -ENOMEM; + rc = trans_pgd_create_empty(&trans_info, &trans_pgd); + if (rc) + return rc; rc = trans_pgd_map_page(&trans_info, trans_pgd, page, dst_addr, PAGE_KERNEL_EXEC); diff --git a/arch/arm64/mm/trans_pgd.c b/arch/arm64/mm/trans_pgd.c index dbabccd78cc4..ece797aa1841 100644 --- a/arch/arm64/mm/trans_pgd.c +++ b/arch/arm64/mm/trans_pgd.c @@ -164,6 +164,18 @@ static int copy_page_tables(pgd_t *dst_pgdp, unsigned long start, return 0; } +int trans_pgd_create_empty(struct trans_pgd_info *info, pgd_t **trans_pgd) +{ + pgd_t *dst_pgdp = trans_alloc(info); + + if (!dst_pgdp) + return -ENOMEM; + + *trans_pgd = dst_pgdp; + + return 0; +} + int trans_pgd_create_copy(pgd_t **dst_pgdp, unsigned long start, unsigned long end) {