Re: [PATCH] riscv: mm: init: Consolidate vars, functions
From: Alex Ghiti
Date: Sun May 16 2021 - 15:10:58 EST
Hi Jisheng,
On 16/05/2021 15:19, Jisheng Zhang wrote:
On Sun, 16 May 2021 21:15:56 +0800 Jisheng Zhang wrote:
From: Jisheng Zhang <jszhang@xxxxxxxxxx>
Consolidate the following items in init.c
Staticize global vars as much as possible;
Add __initdata mark if the global var isn't needed after init
Add __init mark if the func isn't needed after init
Add __ro_after_init if the global var is read only after init
Hi Alexandre,
I think kernel_virt_addr can be removed, users can directly use
the KERNEL_LINK_ADDR MACRO. Maybe I miss the reason of intrducing
it in commit 2bfc6cd81bd17e43 ("riscv: Move kernel mapping outside of
linear mapping"), could you please comment?
Thanks in advance
kernel_virt_addr will be used when I push my relocatable series since
then, the kernel virtual address will be different from
KERNEL_LINK_ADDR. I agree this was not needed in 2bfc6cd81bd17e43
("riscv: Move kernel mapping outside of linear mapping"), I'm a bit late
in pushing the relocatable series.
Signed-off-by: Jisheng Zhang <jszhang@xxxxxxxxxx>
---
arch/riscv/include/asm/set_memory.h | 2 +-
arch/riscv/mm/init.c | 36 +++++++++++++++--------------
2 files changed, 20 insertions(+), 18 deletions(-)
diff --git a/arch/riscv/include/asm/set_memory.h b/arch/riscv/include/asm/set_memory.h
index 086f757e8ba3..9d4d455726d4 100644
--- a/arch/riscv/include/asm/set_memory.h
+++ b/arch/riscv/include/asm/set_memory.h
@@ -27,7 +27,7 @@ static inline int set_memory_rw_nx(unsigned long addr, int numpages) { return 0;
#endif
#if defined(CONFIG_64BIT) && defined(CONFIG_STRICT_KERNEL_RWX)
-void protect_kernel_linear_mapping_text_rodata(void);
+void __init protect_kernel_linear_mapping_text_rodata(void);
#else
static inline void protect_kernel_linear_mapping_text_rodata(void) {}
#endif
diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index 4c4c92ce0bb8..eac2d5c27b3e 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -53,7 +53,7 @@ struct pt_alloc_ops {
#endif
};
-static phys_addr_t dma32_phys_limit __ro_after_init;
+static phys_addr_t dma32_phys_limit __initdata;
static void __init zone_sizes_init(void)
{
@@ -184,7 +184,7 @@ extern char _sdata[], _edata[];
#endif /* CONFIG_XIP_KERNEL */
#ifdef CONFIG_MMU
-static struct pt_alloc_ops _pt_ops __ro_after_init;
+static struct pt_alloc_ops _pt_ops __initdata;
#ifdef CONFIG_XIP_KERNEL
#define pt_ops (*(struct pt_alloc_ops *)XIP_FIXUP(&_pt_ops))
@@ -200,13 +200,13 @@ EXPORT_SYMBOL(va_pa_offset);
#endif
/* Offset between kernel mapping virtual address and kernel load address */
#ifdef CONFIG_64BIT
-unsigned long va_kernel_pa_offset;
+unsigned long va_kernel_pa_offset __ro_after_init;
EXPORT_SYMBOL(va_kernel_pa_offset);
#endif
#ifdef CONFIG_XIP_KERNEL
#define va_kernel_pa_offset (*((unsigned long *)XIP_FIXUP(&va_kernel_pa_offset)))
#endif
-unsigned long va_kernel_xip_pa_offset;
+unsigned long va_kernel_xip_pa_offset __ro_after_init;
EXPORT_SYMBOL(va_kernel_xip_pa_offset);
#ifdef CONFIG_XIP_KERNEL
#define va_kernel_xip_pa_offset (*((unsigned long *)XIP_FIXUP(&va_kernel_xip_pa_offset)))
@@ -216,7 +216,7 @@ EXPORT_SYMBOL(pfn_base);
pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
-pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss;
+static pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss;
pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
@@ -253,7 +253,7 @@ static inline pte_t *__init get_pte_virt_fixmap(phys_addr_t pa)
return (pte_t *)set_fixmap_offset(FIX_PTE, pa);
}
-static inline pte_t *get_pte_virt_late(phys_addr_t pa)
+static inline pte_t *__init get_pte_virt_late(phys_addr_t pa)
{
return (pte_t *) __va(pa);
}
@@ -272,7 +272,7 @@ static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va)
return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
}
-static phys_addr_t alloc_pte_late(uintptr_t va)
+static phys_addr_t __init alloc_pte_late(uintptr_t va)
{
unsigned long vaddr;
@@ -296,10 +296,10 @@ static void __init create_pte_mapping(pte_t *ptep,
#ifndef __PAGETABLE_PMD_FOLDED
-pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss;
-pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss;
-pmd_t early_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
-pmd_t early_dtb_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
+static pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss;
+static pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss;
+static pmd_t early_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
+static pmd_t early_dtb_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
#ifdef CONFIG_XIP_KERNEL
#define trampoline_pmd ((pmd_t *)XIP_FIXUP(trampoline_pmd))
@@ -319,7 +319,7 @@ static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa)
return (pmd_t *)set_fixmap_offset(FIX_PMD, pa);
}
-static pmd_t *get_pmd_virt_late(phys_addr_t pa)
+static pmd_t *__init get_pmd_virt_late(phys_addr_t pa)
{
return (pmd_t *) __va(pa);
}
@@ -336,7 +336,7 @@ static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va)
return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
}
-static phys_addr_t alloc_pmd_late(uintptr_t va)
+static phys_addr_t __init alloc_pmd_late(uintptr_t va)
{
unsigned long vaddr;
@@ -454,14 +454,16 @@ asmlinkage void __init __copy_data(void)
#error "setup_vm() is called from head.S before relocate so it should not use absolute addressing."
#endif
-uintptr_t load_pa, load_sz;
+static uintptr_t load_pa __initdata;
+static uintptr_t load_sz __initdata;
#ifdef CONFIG_XIP_KERNEL
#define load_pa (*((uintptr_t *)XIP_FIXUP(&load_pa)))
#define load_sz (*((uintptr_t *)XIP_FIXUP(&load_sz)))
#endif
#ifdef CONFIG_XIP_KERNEL
-uintptr_t xiprom, xiprom_sz;
+static uintptr_t xiprom __inidata;
+static uintptr_t xiprom_sz __initdata;
#define xiprom_sz (*((uintptr_t *)XIP_FIXUP(&xiprom_sz)))
#define xiprom (*((uintptr_t *)XIP_FIXUP(&xiprom)))
@@ -646,7 +648,7 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa)
}
#if defined(CONFIG_64BIT) && defined(CONFIG_STRICT_KERNEL_RWX)
-void protect_kernel_linear_mapping_text_rodata(void)
+void __init protect_kernel_linear_mapping_text_rodata(void)
{
unsigned long text_start = (unsigned long)lm_alias(_start);
unsigned long init_text_start = (unsigned long)lm_alias(__init_text_begin);
@@ -858,7 +860,7 @@ static void __init reserve_crashkernel(void)
* reserved once we call early_init_fdt_scan_reserved_mem()
* later on.
*/
-static int elfcore_hdr_setup(struct reserved_mem *rmem)
+static int __init elfcore_hdr_setup(struct reserved_mem *rmem)
{
elfcorehdr_addr = rmem->base;
elfcorehdr_size = rmem->size;
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