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[92.145.124.62]) by smtp.gmail.com with ESMTPSA id m8-20020a5d4a08000000b002c3f03d8851sm18571070wrq.16.2023.03.24.08.55.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 24 Mar 2023 08:55:29 -0700 (PDT) From: Alexandre Ghiti To: Paul Walmsley , Palmer Dabbelt , Albert Ou , Rob Herring , Frank Rowand , Andrew Jones , Anup Patel , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org Cc: Alexandre Ghiti Subject: [PATCH v9 1/3] riscv: Get rid of riscv_pfn_base variable Date: Fri, 24 Mar 2023 16:54:19 +0100 Message-Id: <20230324155421.271544-2-alexghiti@rivosinc.com> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20230324155421.271544-1-alexghiti@rivosinc.com> References: <20230324155421.271544-1-alexghiti@rivosinc.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Use directly phys_ram_base instead, riscv_pfn_base is just the pfn of the address contained in phys_ram_base. Even if there is no functional change intended in this patch, actually setting phys_ram_base that early changes the behaviour of kernel_mapping_pa_to_va during the early boot: phys_ram_base used to be zero before this patch and now it is set to the physical start address of the kernel. But it does not break the conversion of a kernel physical address into a virtual address since kernel_mapping_pa_to_va should only be used on kernel physical addresses, i.e. addresses greater than the physical start address of the kernel. Signed-off-by: Alexandre Ghiti Reviewed-by: Andrew Jones Reviewed-by: Anup Patel Tested-by: Anup Patel --- arch/riscv/include/asm/page.h | 3 +-- arch/riscv/mm/init.c | 6 +----- 2 files changed, 2 insertions(+), 7 deletions(-) diff --git a/arch/riscv/include/asm/page.h b/arch/riscv/include/asm/page.h index 7fed7c431928..8dc686f549b6 100644 --- a/arch/riscv/include/asm/page.h +++ b/arch/riscv/include/asm/page.h @@ -91,8 +91,7 @@ typedef struct page *pgtable_t; #endif =20 #ifdef CONFIG_MMU -extern unsigned long riscv_pfn_base; -#define ARCH_PFN_OFFSET (riscv_pfn_base) +#define ARCH_PFN_OFFSET (PFN_DOWN((unsigned long)phys_ram_base)) #else #define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT) #endif /* CONFIG_MMU */ diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c index 87f6a5d475a6..cc558d94559a 100644 --- a/arch/riscv/mm/init.c +++ b/arch/riscv/mm/init.c @@ -271,9 +271,6 @@ static void __init setup_bootmem(void) #ifdef CONFIG_MMU struct pt_alloc_ops pt_ops __initdata; =20 -unsigned long riscv_pfn_base __ro_after_init; -EXPORT_SYMBOL(riscv_pfn_base); - pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss; pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss; static pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss; @@ -285,7 +282,6 @@ static pmd_t __maybe_unused early_dtb_pmd[PTRS_PER_PMD]= __initdata __aligned(PAG =20 #ifdef CONFIG_XIP_KERNEL #define pt_ops (*(struct pt_alloc_ops *)XIP_FIXUP(&pt_ops)) -#define riscv_pfn_base (*(unsigned long *)XIP_FIXUP(&riscv_pfn_ba= se)) #define trampoline_pg_dir ((pgd_t *)XIP_FIXUP(trampoline_pg_dir)) #define fixmap_pte ((pte_t *)XIP_FIXUP(fixmap_pte)) #define early_pg_dir ((pgd_t *)XIP_FIXUP(early_pg_dir)) @@ -985,7 +981,7 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa) kernel_map.va_pa_offset =3D PAGE_OFFSET - kernel_map.phys_addr; kernel_map.va_kernel_pa_offset =3D kernel_map.virt_addr - kernel_map.phys= _addr; =20 - riscv_pfn_base =3D PFN_DOWN(kernel_map.phys_addr); + phys_ram_base =3D kernel_map.phys_addr; =20 /* * The default maximal physical memory size is KERN_VIRT_SIZE for 32-bit --=20 2.37.2