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![Kirill A. Shutemov](/assets/img/avatar_default.png)
If an architecure uses <asm-generic/4level-fixup.h>, build fails if we try to use PUD_SHIFT in generic code: In file included from arch/microblaze/include/asm/bug.h:1:0, from include/linux/bug.h:4, from include/linux/thread_info.h:11, from include/asm-generic/preempt.h:4, from arch/microblaze/include/generated/asm/preempt.h:1, from include/linux/preempt.h:18, from include/linux/spinlock.h:50, from include/linux/mmzone.h:7, from include/linux/gfp.h:5, from include/linux/slab.h:14, from mm/mmap.c:12: mm/mmap.c: In function 'exit_mmap': >> mm/mmap.c:2858:46: error: 'PUD_SHIFT' undeclared (first use in this function) round_up(FIRST_USER_ADDRESS, PUD_SIZE) >> PUD_SHIFT); ^ include/asm-generic/bug.h:86:25: note: in definition of macro 'WARN_ON' int __ret_warn_on = !!(condition); \ ^ mm/mmap.c:2858:46: note: each undeclared identifier is reported only once for each function it appears in round_up(FIRST_USER_ADDRESS, PUD_SIZE) >> PUD_SHIFT); ^ include/asm-generic/bug.h:86:25: note: in definition of macro 'WARN_ON' int __ret_warn_on = !!(condition); \ ^ As with <asm-generic/pgtable-nopud.h>, let's define PUD_SHIFT to PGDIR_SHIFT. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Reported-by: Wu Fengguang <fengguang.wu@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
38 lines
1 KiB
C
38 lines
1 KiB
C
#ifndef _4LEVEL_FIXUP_H
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#define _4LEVEL_FIXUP_H
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#define __ARCH_HAS_4LEVEL_HACK
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#define __PAGETABLE_PUD_FOLDED
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#define PUD_SHIFT PGDIR_SHIFT
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#define PUD_SIZE PGDIR_SIZE
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#define PUD_MASK PGDIR_MASK
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#define PTRS_PER_PUD 1
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#define pud_t pgd_t
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#define pmd_alloc(mm, pud, address) \
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((unlikely(pgd_none(*(pud))) && __pmd_alloc(mm, pud, address))? \
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NULL: pmd_offset(pud, address))
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#define pud_alloc(mm, pgd, address) (pgd)
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#define pud_offset(pgd, start) (pgd)
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#define pud_none(pud) 0
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#define pud_bad(pud) 0
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#define pud_present(pud) 1
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#define pud_ERROR(pud) do { } while (0)
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#define pud_clear(pud) pgd_clear(pud)
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#define pud_val(pud) pgd_val(pud)
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#define pud_populate(mm, pud, pmd) pgd_populate(mm, pud, pmd)
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#define pud_page(pud) pgd_page(pud)
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#define pud_page_vaddr(pud) pgd_page_vaddr(pud)
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#undef pud_free_tlb
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#define pud_free_tlb(tlb, x, addr) do { } while (0)
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#define pud_free(mm, x) do { } while (0)
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#define __pud_free_tlb(tlb, x, addr) do { } while (0)
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#undef pud_addr_end
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#define pud_addr_end(addr, end) (end)
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#endif
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