From 3910a7f485e1222de2176ef5bf3a1d8de3152920 Mon Sep 17 00:00:00 2001 From: Michael Ellerman Date: Fri, 29 Apr 2016 23:25:27 +1000 Subject: powerpc/mm: Add pte_xchg() helper We have five locations in 64-bit hash MMU code that do a cmpxchg() of a PTE. Currently doing it inline OK, but in a future patch we will be converting the PTEs to __be64 in some configs. In that case we will need casts at every cmpxchg() site in order to keep sparse happy. So move the logic into a helper, this is a reasonably nice cleanup on its own. Signed-off-by: Michael Ellerman --- arch/powerpc/include/asm/kvm_book3s_64.h | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) (limited to 'arch/powerpc/include/asm/kvm_book3s_64.h') diff --git a/arch/powerpc/include/asm/kvm_book3s_64.h b/arch/powerpc/include/asm/kvm_book3s_64.h index 7529aab068f5..42da513fec2d 100644 --- a/arch/powerpc/include/asm/kvm_book3s_64.h +++ b/arch/powerpc/include/asm/kvm_book3s_64.h @@ -319,11 +319,8 @@ static inline pte_t kvmppc_read_update_linux_pte(pte_t *ptep, int writing) if (writing && pte_write(old_pte)) new_pte = pte_mkdirty(new_pte); - if (pte_val(old_pte) == __cmpxchg_u64((unsigned long *)ptep, - pte_val(old_pte), - pte_val(new_pte))) { + if (pte_xchg(ptep, old_pte, new_pte)) break; - } } return new_pte; } -- cgit v1.2.2