tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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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arch/powerpc/include/asm/pgtable-ppc64.h
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arch/powerpc/include/asm/pgtable-ppc64.h
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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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: "=&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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-
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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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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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:"=&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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arch/powerpc/include/asm/pte-hash64.h
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arch/powerpc/include/asm/pte-hash64.h