powerpc/pgtable: Drop PTE_ATOMIC_UPDATES

40x was the last user of PTE_ATOMIC_UPDATES.

Drop everything related to PTE_ATOMIC_UPDATES.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/dbe8438fd1ed3e500132c8ab70269d4e6cc84531.1590079968.git.christophe.leroy@csgroup.eu

diff --git a/arch/powerpc/include/asm/nohash/32/pgtable.h b/arch/powerpc/include/asm/nohash/32/pgtable.h
index 717f995..46cd542 100644 (file)
--- a/arch/powerpc/include/asm/nohash/32/pgtable.h
+++ b/arch/powerpc/include/asm/nohash/32/pgtable.h
@@ -259,25 +259,10 @@ static inline pte_basic_t pte_update(struct mm_struct *mm, unsigned long addr, p
 static inline pte_basic_t pte_update(struct mm_struct *mm, unsigned long addr, pte_t *p,
                                     unsigned long clr, unsigned long set, int huge)
 {
-#if defined(PTE_ATOMIC_UPDATES) && !defined(CONFIG_PTE_64BIT)
-       unsigned long old, tmp;
-
-       __asm__ __volatile__("\
-1:     lwarx   %0,0,%3\n\
-       andc    %1,%0,%4\n\
-       or      %1,%1,%5\n"
-       PPC405_ERR77(0,%3)
-"      stwcx.  %1,0,%3\n\
-       bne-    1b"
-       : "=&r" (old), "=&r" (tmp), "=m" (*p)
-       : "r" (p), "r" (clr), "r" (set), "m" (*p)
-       : "cc" );
-#else /* PTE_ATOMIC_UPDATES */
        pte_basic_t old = pte_val(*p);
        pte_basic_t new = (old & ~(pte_basic_t)clr) | set;
 
        *p = __pte(new);
-#endif /* !PTE_ATOMIC_UPDATES */
 
 #ifdef CONFIG_44x
        if ((old & _PAGE_USER) && (old & _PAGE_EXEC))