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powerpc/mm/radix: Skip ptesync in pte update helpers 

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>
This commit is contained in:
Aneesh Kumar K.V 2017-02-09 08:28:21 +05:30 committed by Michael Ellerman
parent f4894b80b1
commit 438e69b52b
1 changed files with 0 additions and 3 deletions
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3
arch/powerpc/include/asm/book3s/64/radix.h
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@ -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
*/