[PATCH v7 1/4] riscv: Get rid of riscv_pfn_base variable
From: Alexandre Ghiti <hidden>
Date: 2023-03-10 09:47:30
Also in:
linux-devicetree, linux-mm, linux-riscv, lkml
Subsystem:
risc-v architecture, the rest · Maintainers:
Paul Walmsley, Palmer Dabbelt, Albert Ou, Linus Torvalds
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 <redacted> Reviewed-by: Andrew Jones <redacted> --- 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 #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 478d6763a01a..225a7d2b65cc 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; -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 #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_base)) #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 = PAGE_OFFSET - kernel_map.phys_addr; kernel_map.va_kernel_pa_offset = kernel_map.virt_addr - kernel_map.phys_addr; - riscv_pfn_base = PFN_DOWN(kernel_map.phys_addr); + phys_ram_base = kernel_map.phys_addr; /* * The default maximal physical memory size is KERN_VIRT_SIZE for 32-bit
--
2.37.2
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