[PATCH AUTOSEL 3.18 52/61] um: Avoid marking pages with "changed protection"

[Sasha Levin]

From: Anton Ivanov <anton.iva...@cambridgegreys.com>

[ Upstream commit 8892d8545f2d0342b9c550defbfb165db237044b ]

Changing protection is a very high cost operation in UML
because in addition to an extra syscall it also interrupts
mmap merge sequences generated by the tlb.

While the condition is not particularly common it is worth
avoiding.

Signed-off-by: Anton Ivanov <anton.iva...@cambridgegreys.com>
Signed-off-by: Richard Weinberger <rich...@nod.at>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 arch/um/include/asm/pgtable.h | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/arch/um/include/asm/pgtable.h b/arch/um/include/asm/pgtable.h
index bf974f712af7..e75fa226f08a 100644
--- a/arch/um/include/asm/pgtable.h
+++ b/arch/um/include/asm/pgtable.h
@@ -210,12 +210,17 @@ static inline pte_t pte_mkold(pte_t pte)
 
 static inline pte_t pte_wrprotect(pte_t pte)
 { 
-       pte_clear_bits(pte, _PAGE_RW);
+       if (likely(pte_get_bits(pte, _PAGE_RW)))
+               pte_clear_bits(pte, _PAGE_RW);
+       else
+               return pte;
        return(pte_mknewprot(pte)); 
 }
 
 static inline pte_t pte_mkread(pte_t pte)
 { 
+       if (unlikely(pte_get_bits(pte, _PAGE_USER)))
+               return pte;
        pte_set_bits(pte, _PAGE_USER);
        return(pte_mknewprot(pte)); 
 }
@@ -234,6 +239,8 @@ static inline pte_t pte_mkyoung(pte_t pte)
 
 static inline pte_t pte_mkwrite(pte_t pte)     
 {
+       if (unlikely(pte_get_bits(pte,  _PAGE_RW)))
+               return pte;
        pte_set_bits(pte, _PAGE_RW);
        return(pte_mknewprot(pte)); 
 }
-- 
2.19.1