diff mbox

[4/5,Yakkety,SRU] powerpc/mm/radix: Skip ptesync in pte update helpers

Message ID 1487951899-94245-5-git-send-email-seth.forshee@canonical.com
State New
Headers show

Commit Message

Seth Forshee Feb. 24, 2017, 3:58 p.m. UTC 
From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>

BugLink: http://bugs.launchpad.net/bugs/1667116

We do them at the start of tlb flush, and we are sure a pte update will be
followed by a tlbflush. Hence we can skip the ptesync in pte update helpers.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Tested-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
(cherry picked from linux-next commit 438e69b52be776c035aa2a851ccc1709033d729b)
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
---
 arch/powerpc/include/asm/book3s/64/radix.h | 3 ---
 1 file changed, 3 deletions(-)
diff mbox

Patch

diff --git a/arch/powerpc/include/asm/book3s/64/radix.h b/arch/powerpc/include/asm/book3s/64/radix.h
index fcf822d6c204..77e590c77299 100644
--- a/arch/powerpc/include/asm/book3s/64/radix.h
+++ b/arch/powerpc/include/asm/book3s/64/radix.h
@@ -144,13 +144,11 @@  static inline unsigned long radix__pte_update(struct mm_struct *mm,
 		 * new value of pte
 		 */
 		new_pte = (old_pte | set) & ~clr;
-		asm volatile("ptesync" : : : "memory");
 		radix__flush_tlb_pte_p9_dd1(old_pte, mm, addr);
 		if (new_pte)
 			__radix_pte_update(ptep, 0, new_pte);
 	} else
 		old_pte = __radix_pte_update(ptep, clr, set);
-	asm volatile("ptesync" : : : "memory");
 	if (!huge)
 		assert_pte_locked(mm, addr);
 
@@ -195,7 +193,6 @@  static inline void radix__ptep_set_access_flags(struct mm_struct *mm,
 		unsigned long old_pte, new_pte;
 
 		old_pte = __radix_pte_update(ptep, ~0, 0);
-		asm volatile("ptesync" : : : "memory");
 		/*
 		 * new value of pte
 		 */