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SubjectRe: [PATCH] define vmemmap before pfn_to_page calls
On Tue, Dec 17, 2019 at 6:45 PM David Abdurachmanov
<david.abdurachmanov@gmail.com> wrote:
>
> pfn_to_page call depends on `vmemmap` being available before the call.
> This caused compilation errors in Fedora/RISCV with 5.5-rc2 and was caused
> by NOMMU changes which moved declarations after functions definitions.
>
> Signed-off-by: David Abdurachmanov <david.abdurachmanov@sifive.com>
> Fixes: 6bd33e1ece52 ("riscv: add nommu support")
> ---
> arch/riscv/include/asm/pgtable.h | 34 ++++++++++++++++----------------
> 1 file changed, 17 insertions(+), 17 deletions(-)
>
> diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
> index 7ff0ed4f292e..d8c89e6e6b3d 100644
> --- a/arch/riscv/include/asm/pgtable.h
> +++ b/arch/riscv/include/asm/pgtable.h
> @@ -90,6 +90,23 @@ extern pgd_t swapper_pg_dir[];
> #define __S110 PAGE_SHARED_EXEC
> #define __S111 PAGE_SHARED_EXEC
>
> +#define VMALLOC_SIZE (KERN_VIRT_SIZE >> 1)
> +#define VMALLOC_END (PAGE_OFFSET - 1)
> +#define VMALLOC_START (PAGE_OFFSET - VMALLOC_SIZE)
> +
> +/*
> + * Roughly size the vmemmap space to be large enough to fit enough
> + * struct pages to map half the virtual address space. Then
> + * position vmemmap directly below the VMALLOC region.
> + */
> +#define VMEMMAP_SHIFT \
> + (CONFIG_VA_BITS - PAGE_SHIFT - 1 + STRUCT_PAGE_MAX_SHIFT)
> +#define VMEMMAP_SIZE BIT(VMEMMAP_SHIFT)
> +#define VMEMMAP_END (VMALLOC_START - 1)
> +#define VMEMMAP_START (VMALLOC_START - VMEMMAP_SIZE)
> +
> +#define vmemmap ((struct page *)VMEMMAP_START)
> +
> static inline int pmd_present(pmd_t pmd)
> {
> return (pmd_val(pmd) & (_PAGE_PRESENT | _PAGE_PROT_NONE));
> @@ -400,23 +417,6 @@ static inline int ptep_clear_flush_young(struct vm_area_struct *vma,
> #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
> #define __swp_entry_to_pte(x) ((pte_t) { (x).val })
>
> -#define VMALLOC_SIZE (KERN_VIRT_SIZE >> 1)
> -#define VMALLOC_END (PAGE_OFFSET - 1)
> -#define VMALLOC_START (PAGE_OFFSET - VMALLOC_SIZE)
> -
> -/*
> - * Roughly size the vmemmap space to be large enough to fit enough
> - * struct pages to map half the virtual address space. Then
> - * position vmemmap directly below the VMALLOC region.
> - */
> -#define VMEMMAP_SHIFT \
> - (CONFIG_VA_BITS - PAGE_SHIFT - 1 + STRUCT_PAGE_MAX_SHIFT)
> -#define VMEMMAP_SIZE BIT(VMEMMAP_SHIFT)
> -#define VMEMMAP_END (VMALLOC_START - 1)
> -#define VMEMMAP_START (VMALLOC_START - VMEMMAP_SIZE)
> -
> -#define vmemmap ((struct page *)VMEMMAP_START)
> -
> #define PCI_IO_SIZE SZ_16M
> #define PCI_IO_END VMEMMAP_START
> #define PCI_IO_START (PCI_IO_END - PCI_IO_SIZE)
> --
> 2.23.0
>

Can you add a comment for "#define vmemmap" about your findings ?

Otherwise looks good to me.

Reviewed-by: Anup Patel <anup@brainfault.org>

Regards,
Anup

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