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[73.69.118.222]) by smtp.gmail.com with ESMTPSA id o9sm3454657qtr.71.2019.08.16.19.46.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 16 Aug 2019 19:46:39 -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 Subject: [PATCH v2 06/14] arm64, trans_table: add trans_table_create_empty Date: Fri, 16 Aug 2019 22:46:21 -0400 Message-Id: <20190817024629.26611-7-pasha.tatashin@soleen.com> X-Mailer: git-send-email 2.22.1 In-Reply-To: <20190817024629.26611-1-pasha.tatashin@soleen.com> References: <20190817024629.26611-1-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: X-Virus-Scanned: ClamAV using ClamSMTP This functions returns a zeroed trans_table using the allocator that is specified in the info argument. trans_tables should be created by using this function. Signed-off-by: Pavel Tatashin --- arch/arm64/include/asm/trans_table.h | 4 ++++ arch/arm64/kernel/hibernate.c | 6 +++--- arch/arm64/mm/trans_table.c | 12 ++++++++++++ 3 files changed, 19 insertions(+), 3 deletions(-) diff --git a/arch/arm64/include/asm/trans_table.h b/arch/arm64/include/asm/trans_table.h index 1a57af09ded5..02d3a0333dc9 100644 --- a/arch/arm64/include/asm/trans_table.h +++ b/arch/arm64/include/asm/trans_table.h @@ -40,6 +40,10 @@ struct trans_table_info { unsigned long trans_flags; }; +/* Create and empty trans table. */ +int trans_table_create_empty(struct trans_table_info *info, + pgd_t **trans_table); + int trans_table_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 524b68ec3233..3a7b362e5a58 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_table = (void *)get_safe_page(GFP_ATOMIC); - if (!trans_table) - return -ENOMEM; + rc = trans_table_create_empty(&trans_info, &trans_table); + if (rc) + return rc; rc = trans_table_map_page(&trans_info, trans_table, page, dst_addr, PAGE_KERNEL_EXEC); diff --git a/arch/arm64/mm/trans_table.c b/arch/arm64/mm/trans_table.c index 12f4b3cab6d6..6deb35f83118 100644 --- a/arch/arm64/mm/trans_table.c +++ b/arch/arm64/mm/trans_table.c @@ -164,6 +164,18 @@ static int copy_page_tables(pgd_t *dst_pgdp, unsigned long start, return 0; } +int trans_table_create_empty(struct trans_table_info *info, pgd_t **trans_table) +{ + pgd_t *dst_pgdp = trans_alloc(info); + + if (!dst_pgdp) + return -ENOMEM; + + *trans_table = dst_pgdp; + + return 0; +} + int trans_table_create_copy(pgd_t **dst_pgdp, unsigned long start, unsigned long end) {