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arch: fix has_transparent_hugepage()
I've just discovered that the useful-sounding has_transparent_hugepage() is actually an architecture-dependent minefield: on some arches it only builds if CONFIG_TRANSPARENT_HUGEPAGE=y, on others it's also there when not, but on some of those (arm and arm64) it then gives the wrong answer; and on mips alone it's marked __init, which would crash if called later (but so far it has not been called later). Straighten this out: make it available to all configs, with a sensible default in asm-generic/pgtable.h, removing its definitions from those arches (arc, arm, arm64, sparc, tile) which are served by the default, adding #define has_transparent_hugepage has_transparent_hugepage to those (mips, powerpc, s390, x86) which need to override the default at runtime, and removing the __init from mips (but maybe that kind of code should be avoided after init: set a static variable the first time it's called). Signed-off-by: Hugh Dickins <hughd@google.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Andres Lagar-Cavilla <andreslc@google.com> Cc: Yang Shi <yang.shi@linaro.org> Cc: Ning Qu <quning@gmail.com> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Acked-by: David S. Miller <davem@davemloft.net> Acked-by: Vineet Gupta <vgupta@synopsys.com> [arch/arc] Acked-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> [arch/s390] Acked-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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parent
1d069b7dd5
commit
fd8cfd3000
arch
arc/include/asm
arm/include/asm
arm64/include/asm
mips
powerpc/include/asm
s390/include/asm
sparc/include/asm
tile/include/asm
x86/include/asm
include/asm-generic
@ -61,8 +61,6 @@ static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
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extern void update_mmu_cache_pmd(struct vm_area_struct *vma, unsigned long addr,
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pmd_t *pmd);
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#define has_transparent_hugepage() 1
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/* Generic variants assume pgtable_t is struct page *, hence need for these */
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#define __HAVE_ARCH_PGTABLE_DEPOSIT
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extern void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
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@ -281,11 +281,6 @@ static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
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flush_pmd_entry(pmdp);
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}
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static inline int has_transparent_hugepage(void)
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{
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return 1;
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}
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_PGTABLE_3LEVEL_H */
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@ -314,11 +314,6 @@ static inline int pmd_protnone(pmd_t pmd)
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#define set_pmd_at(mm, addr, pmdp, pmd) set_pte_at(mm, addr, (pte_t *)pmdp, pmd_pte(pmd))
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static inline int has_transparent_hugepage(void)
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{
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return 1;
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}
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#define __pgprot_modify(prot,mask,bits) \
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__pgprot((pgprot_val(prot) & ~(mask)) | (bits))
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@ -468,6 +468,7 @@ static inline int io_remap_pfn_range(struct vm_area_struct *vma,
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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#define has_transparent_hugepage has_transparent_hugepage
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extern int has_transparent_hugepage(void);
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static inline int pmd_trans_huge(pmd_t pmd)
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@ -400,19 +400,20 @@ void add_wired_entry(unsigned long entrylo0, unsigned long entrylo1,
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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int __init has_transparent_hugepage(void)
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int has_transparent_hugepage(void)
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{
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unsigned int mask;
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unsigned long flags;
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static unsigned int mask = -1;
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local_irq_save(flags);
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write_c0_pagemask(PM_HUGE_MASK);
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back_to_back_c0_hazard();
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mask = read_c0_pagemask();
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write_c0_pagemask(PM_DEFAULT_MASK);
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local_irq_restore(flags);
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if (mask == -1) { /* first call comes during __init */
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unsigned long flags;
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local_irq_save(flags);
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write_c0_pagemask(PM_HUGE_MASK);
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back_to_back_c0_hazard();
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mask = read_c0_pagemask();
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write_c0_pagemask(PM_DEFAULT_MASK);
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local_irq_restore(flags);
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}
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return mask == PM_HUGE_MASK;
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}
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@ -219,6 +219,7 @@ extern void set_pmd_at(struct mm_struct *mm, unsigned long addr,
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pmd_t *pmdp, pmd_t pmd);
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extern void update_mmu_cache_pmd(struct vm_area_struct *vma, unsigned long addr,
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pmd_t *pmd);
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#define has_transparent_hugepage has_transparent_hugepage
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extern int has_transparent_hugepage(void);
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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@ -65,7 +65,6 @@ extern int gup_hugepte(pte_t *ptep, unsigned long sz, unsigned long addr,
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struct page **pages, int *nr);
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#ifndef CONFIG_TRANSPARENT_HUGEPAGE
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#define pmd_large(pmd) 0
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#define has_transparent_hugepage() 0
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#endif
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pte_t *__find_linux_pte_or_hugepte(pgd_t *pgdir, unsigned long ea,
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bool *is_thp, unsigned *shift);
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@ -1223,6 +1223,7 @@ static inline int pmd_trans_huge(pmd_t pmd)
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return pmd_val(pmd) & _SEGMENT_ENTRY_LARGE;
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}
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#define has_transparent_hugepage has_transparent_hugepage
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static inline int has_transparent_hugepage(void)
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{
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return MACHINE_HAS_HPAGE ? 1 : 0;
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@ -681,8 +681,6 @@ static inline unsigned long pmd_trans_huge(pmd_t pmd)
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return pte_val(pte) & _PAGE_PMD_HUGE;
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}
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#define has_transparent_hugepage() 1
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static inline pmd_t pmd_mkold(pmd_t pmd)
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{
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pte_t pte = __pte(pmd_val(pmd));
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@ -487,7 +487,6 @@ static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
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}
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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#define has_transparent_hugepage() 1
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#define pmd_trans_huge pmd_huge_page
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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@ -181,6 +181,7 @@ static inline int pmd_trans_huge(pmd_t pmd)
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return (pmd_val(pmd) & (_PAGE_PSE|_PAGE_DEVMAP)) == _PAGE_PSE;
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}
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#define has_transparent_hugepage has_transparent_hugepage
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static inline int has_transparent_hugepage(void)
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{
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return boot_cpu_has(X86_FEATURE_PSE);
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@ -806,4 +806,12 @@ static inline int pmd_clear_huge(pmd_t *pmd)
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#define io_remap_pfn_range remap_pfn_range
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#endif
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#ifndef has_transparent_hugepage
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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#define has_transparent_hugepage() 1
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#else
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#define has_transparent_hugepage() 0
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#endif
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#endif
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#endif /* _ASM_GENERIC_PGTABLE_H */
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