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| author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2016-04-29 13:25:26 (GMT) |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2016-05-01 08:32:15 (GMT) |
| commit | 4bece39b503c2340de154c82bf6d928e72d74d4e (patch) | |
| tree | dc39f7fe2b06efb554e80827aec8f2ee81dec47c /arch | |
| parent | 670eea924198456873f3346bb247b662d7ddffd7 (diff) | |
| download | linux-4bece39b503c2340de154c82bf6d928e72d74d4e.tar.xz | |
powerpc/mm: Drop PTE_ATOMIC_UPDATES from pmd_hugepage_update()
pmd_hugepage_update() is inside #ifdef CONFIG_TRANSPARENT_HUGEPAGE. THP
can only be enabled if PPC_BOOK3S_64=y && PPC_64K_PAGES=y, aka. hash64.
On hash64 we always define PTE_ATOMIC_UPDATES to 1, meaning the #ifdef
in pmd_hugepage_update() is unnecessary, so drop it.
That is also the only use of PTE_ATOMIC_UPDATES in any of the hash code,
meaning we no longer need to #define it at all in the hash headers.
Note it's still #defined and used in the nohash code.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/include/asm/book3s/32/hash.h | 3 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/book3s/64/hash.h | 2 | ||||
| -rw-r--r-- | arch/powerpc/mm/pgtable_64.c | 6 |
3 files changed, 1 insertions, 10 deletions
diff --git a/arch/powerpc/include/asm/book3s/32/hash.h b/arch/powerpc/include/asm/book3s/32/hash.h index 264b754..880db13 100644 --- a/arch/powerpc/include/asm/book3s/32/hash.h +++ b/arch/powerpc/include/asm/book3s/32/hash.h @@ -39,8 +39,5 @@ #define _PMD_PRESENT_MASK (PAGE_MASK) #define _PMD_BAD (~PAGE_MASK) -/* Hash table based platforms need atomic updates of the linux PTE */ -#define PTE_ATOMIC_UPDATES 1 - #endif /* __KERNEL__ */ #endif /* _ASM_POWERPC_BOOK3S_32_HASH_H */ diff --git a/arch/powerpc/include/asm/book3s/64/hash.h b/arch/powerpc/include/asm/book3s/64/hash.h index d0ee6fc..8f2ae067 100644 --- a/arch/powerpc/include/asm/book3s/64/hash.h +++ b/arch/powerpc/include/asm/book3s/64/hash.h @@ -127,8 +127,6 @@ #define _PTEIDX_SECONDARY 0x8 #define _PTEIDX_GROUP_IX 0x7 -/* Hash table based platforms need atomic updates of the linux PTE */ -#define PTE_ATOMIC_UPDATES 1 #define _PTE_NONE_MASK _PAGE_HPTEFLAGS /* * The mask convered by the RPN must be a ULL on 32-bit platforms with diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c index 3471060..cda88b8 100644 --- a/arch/powerpc/mm/pgtable_64.c +++ b/arch/powerpc/mm/pgtable_64.c @@ -522,7 +522,6 @@ unsigned long pmd_hugepage_update(struct mm_struct *mm, unsigned long addr, assert_spin_locked(&mm->page_table_lock); #endif -#ifdef PTE_ATOMIC_UPDATES __asm__ __volatile__( "1: ldarx %0,0,%3\n\ andi. %1,%0,%6\n\ @@ -534,10 +533,7 @@ unsigned long pmd_hugepage_update(struct mm_struct *mm, unsigned long addr, : "=&r" (old), "=&r" (tmp), "=m" (*pmdp) : "r" (pmdp), "r" (clr), "m" (*pmdp), "i" (_PAGE_BUSY), "r" (set) : "cc" ); -#else - old = pmd_val(*pmdp); - *pmdp = __pmd((old & ~clr) | set); -#endif + trace_hugepage_update(addr, old, clr, set); if (old & _PAGE_HASHPTE) hpte_do_hugepage_flush(mm, addr, pmdp, old); |