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SubjectRe: [PATCH] RISC-V: Move all address space definition macros to one place
Date
On Fri, 2020-02-28 at 09:38 +0530, Anup Patel wrote:
> On Tue, Feb 25, 2020 at 1:04 AM Atish Patra <atish.patra@wdc.com>
> wrote:
> > If both CONFIG_KASAN and CONFIG_SPARSEMEM_VMEMMAP are set, we get
> > the
> > following compilation error.
> >
> > ---------------------------------------------------------------
> > ./arch/riscv/include/asm/pgtable-64.h: In function ‘pud_page’:
> > ./include/asm-generic/memory_model.h:54:29: error: ‘vmemmap’
> > undeclared
> > (first use in this function); did you mean ‘mem_map’?
> > #define __pfn_to_page(pfn) (vmemmap + (pfn))
> > ^~~~~~~
> > ./include/asm-generic/memory_model.h:82:21: note: in expansion of
> > macro ‘__pfn_to_page’
> >
> > #define pfn_to_page __pfn_to_page
> > ^~~~~~~~~~~~~
> > ./arch/riscv/include/asm/pgtable-64.h:70:9: note: in expansion of
> > macro
> > ‘pfn_to_page’
> > return pfn_to_page(pud_val(pud) >> _PAGE_PFN_SHIFT);
> > ---------------------------------------------------------------
> >
> > Fix the compliation errors by moving all the address space
> > definition
> > macros before including pgtable-64.h.
> >
> > Cc: stable@vger.kernel.org
> > Fixes: 8ad8b72721d0 (riscv: Add KASAN support)
> >
> > Signed-off-by: Atish Patra <atish.patra@wdc.com>
> > ---
> > arch/riscv/include/asm/pgtable.h | 78 +++++++++++++++++-----------
> > ----
> > 1 file changed, 41 insertions(+), 37 deletions(-)
> >
> > diff --git a/arch/riscv/include/asm/pgtable.h
> > b/arch/riscv/include/asm/pgtable.h
> > index 453afb0a570a..4f6ee48a42e8 100644
> > --- a/arch/riscv/include/asm/pgtable.h
> > +++ b/arch/riscv/include/asm/pgtable.h
> > @@ -19,6 +19,47 @@
> > #include <asm/tlbflush.h>
> > #include <linux/mm_types.h>
> >
> > +#ifdef CONFIG_MMU
> > +
> > +#define VMALLOC_SIZE (KERN_VIRT_SIZE >> 1)
> > +#define VMALLOC_END (PAGE_OFFSET - 1)
> > +#define VMALLOC_START (PAGE_OFFSET - VMALLOC_SIZE)
> > +
> > +#define BPF_JIT_REGION_SIZE (SZ_128M)
> > +#define BPF_JIT_REGION_START (PAGE_OFFSET - BPF_JIT_REGION_SIZE)
> > +#define BPF_JIT_REGION_END (VMALLOC_END)
> > +
> > +/*
> > + * 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 for pfn_to_page & page_to_pfn calls. Needed if
> > kernel
> > + * is configured with CONFIG_SPARSEMEM_VMEMMAP enabled.
> > + */
> > +#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)
> > +
> > +#define FIXADDR_TOP PCI_IO_START
> > +#ifdef CONFIG_64BIT
> > +#define FIXADDR_SIZE PMD_SIZE
> > +#else
> > +#define FIXADDR_SIZE PGDIR_SIZE
> > +#endif
> > +#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
> > +
> > +#endif
> > +
> > #ifdef CONFIG_64BIT
> > #include <asm/pgtable-64.h>
> > #else
> > @@ -90,31 +131,6 @@ 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)
> > -
> > -#define BPF_JIT_REGION_SIZE (SZ_128M)
> > -#define BPF_JIT_REGION_START (PAGE_OFFSET - BPF_JIT_REGION_SIZE)
> > -#define BPF_JIT_REGION_END (VMALLOC_END)
> > -
> > -/*
> > - * 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 for pfn_to_page & page_to_pfn calls. Needed if
> > kernel
> > - * is configured with CONFIG_SPARSEMEM_VMEMMAP enabled.
> > - */
> > -#define vmemmap ((struct page *)VMEMMAP_START)
> > -
> > static inline int pmd_present(pmd_t pmd)
> > {
> > return (pmd_val(pmd) & (_PAGE_PRESENT | _PAGE_PROT_NONE));
> > @@ -452,18 +468,6 @@ 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 PCI_IO_SIZE SZ_16M
> > -#define PCI_IO_END VMEMMAP_START
> > -#define PCI_IO_START (PCI_IO_END - PCI_IO_SIZE)
> > -
> > -#define FIXADDR_TOP PCI_IO_START
> > -#ifdef CONFIG_64BIT
> > -#define FIXADDR_SIZE PMD_SIZE
> > -#else
> > -#define FIXADDR_SIZE PGDIR_SIZE
> > -#endif
> > -#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
> > -
> > /*
> > * Task size is 0x4000000000 for RV64 or 0x9fc00000 for RV32.
> > * Note that PGDIR_SIZE must evenly divide TASK_SIZE.
> > --
> > 2.25.0
> >
>
> Looks good to me. At least now all virtual memory layout related
> defines are in one place.
>
> Reviewed-by: Anup Patel <anup@brainfault.org>
>
> Regards,
> Anup
>

Hi Palmer,
I think this patch is a RC candidate. Can this be included in next PR ?

--
Regards,
Atish
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