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[73.69.118.222]) by smtp.gmail.com with ESMTPSA id c204sm13342030qkb.90.2019.10.16.13.00.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 16 Oct 2019 13:00:49 -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, steve.capper@arm.com, rfontana@redhat.com, tglx@linutronix.de Subject: [PATCH v7 08/25] arm64: hibernate: rename dst to page in create_safe_exec_page Date: Wed, 16 Oct 2019 16:00:17 -0400 Message-Id: <20191016200034.1342308-9-pasha.tatashin@soleen.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191016200034.1342308-1-pasha.tatashin@soleen.com> References: <20191016200034.1342308-1-pasha.tatashin@soleen.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191016_130051_909702_FF2FAD06 X-CRM114-Status: GOOD ( 10.47 ) X-Spam-Score: -0.2 (/) X-Spam-Report: SpamAssassin version 3.4.2 on bombadil.infradead.org summary: Content analysis details: (-0.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [2607:f8b0:4864:20:0:0:0:843 listed in] [list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org create_safe_exec_page() allocates a safe page and maps it at a specific location, also this function returns the physical address of newly allocated page. The destination VA, and PA are specified in arguments: dst_addr, phys_dst_addr However, within the function it uses "dst" which has unsigned long type, but is actually a pointers in the current virtual space. This is confusing to read. Rename dst to more appropriate page (page that is created), and also change its time to "void *" Signed-off-by: Pavel Tatashin Reviewed-by: James Morse --- arch/arm64/kernel/hibernate.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/arch/arm64/kernel/hibernate.c b/arch/arm64/kernel/hibernate.c index 83c41a2f8400..1ca8af685e96 100644 --- a/arch/arm64/kernel/hibernate.c +++ b/arch/arm64/kernel/hibernate.c @@ -198,18 +198,18 @@ static int create_safe_exec_page(void *src_start, size_t length, unsigned long dst_addr, phys_addr_t *phys_dst_addr) { + void *page = (void *)get_safe_page(GFP_ATOMIC); pgd_t *trans_pgd; pgd_t *pgdp; pud_t *pudp; pmd_t *pmdp; pte_t *ptep; - unsigned long dst = get_safe_page(GFP_ATOMIC); - if (!dst) + if (!page) return -ENOMEM; - memcpy((void *)dst, src_start, length); - __flush_icache_range(dst, dst + 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) @@ -240,7 +240,7 @@ static int create_safe_exec_page(void *src_start, size_t length, } ptep = pte_offset_kernel(pmdp, dst_addr); - set_pte(ptep, pfn_pte(virt_to_pfn(dst), PAGE_KERNEL_EXEC)); + set_pte(ptep, pfn_pte(virt_to_pfn(page), PAGE_KERNEL_EXEC)); /* * Load our new page tables. A strict BBM approach requires that we @@ -259,7 +259,7 @@ static int create_safe_exec_page(void *src_start, size_t length, write_sysreg(phys_to_ttbr(virt_to_phys(trans_pgd)), ttbr0_el1); isb(); - *phys_dst_addr = virt_to_phys((void *)dst); + *phys_dst_addr = virt_to_phys(page); return 0; }