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powerpc/mm: Add option for non-atomic PTE updates to ppc64
ppc32 has it already, add it to ppc64 as a preliminary for adding support for Book3E 64-bit support Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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2 changed files with 13 additions and 1 deletions
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@ -178,6 +178,7 @@ static inline unsigned long pte_update(struct mm_struct *mm,
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pte_t *ptep, unsigned long clr,
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int huge)
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{
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#ifdef PTE_ATOMIC_UPDATES
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unsigned long old, tmp;
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__asm__ __volatile__(
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@ -190,7 +191,10 @@ static inline unsigned long pte_update(struct mm_struct *mm,
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: "=&r" (old), "=&r" (tmp), "=m" (*ptep)
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: "r" (ptep), "r" (clr), "m" (*ptep), "i" (_PAGE_BUSY)
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: "cc" );
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#else
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unsigned long old = pte_val(*ptep);
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*ptep = __pte(old & ~clr);
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#endif
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/* huge pages use the old page table lock */
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if (!huge)
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assert_pte_locked(mm, addr);
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@ -278,6 +282,8 @@ static inline void __ptep_set_access_flags(pte_t *ptep, pte_t entry)
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unsigned long bits = pte_val(entry) &
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(_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW |
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_PAGE_EXEC | _PAGE_HWEXEC);
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#ifdef PTE_ATOMIC_UPDATES
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unsigned long old, tmp;
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__asm__ __volatile__(
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@ -290,6 +296,10 @@ static inline void __ptep_set_access_flags(pte_t *ptep, pte_t entry)
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:"=&r" (old), "=&r" (tmp), "=m" (*ptep)
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:"r" (bits), "r" (ptep), "m" (*ptep), "i" (_PAGE_BUSY)
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:"cc");
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#else
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unsigned long old = pte_val(*ptep);
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*ptep = __pte(old | bits);
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#endif
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}
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#define __HAVE_ARCH_PTE_SAME
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@ -41,6 +41,8 @@
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#define _PTEIDX_SECONDARY 0x8
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#define _PTEIDX_GROUP_IX 0x7
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/* Hash table based platforms need atomic updates of the linux PTE */
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#define PTE_ATOMIC_UPDATES 1
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#ifdef CONFIG_PPC_64K_PAGES
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#include <asm/pte-hash64-64k.h>
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