[Xen-changelog] [xen master] xen: arm: remove unnecessary cache flush in write_pte

[patchbot@xxxxxxx]

commit 225ece46211328723a79f13152cb904c0b0f38b2
Author:     Ian Campbell <ian.campbell@xxxxxxxxxx>
AuthorDate: Wed Jul 17 12:19:28 2013 +0100
Commit:     Ian Campbell <ian.campbell@xxxxxxxxxx>
CommitDate: Mon Jul 29 16:54:48 2013 +0100

    xen: arm: remove unnecessary cache flush in write_pte
    
    On a ARMv7/v8 SMP system the MMU is coherent
    
    Suggested-by: Marc Zyngier <marc.zyngier@xxxxxxx>
    Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
    Acked-by: Tim Deegan <tim@xxxxxxx>
    [ ijc -- dropped the associated dsb too ]
---
 xen/include/asm-arm/arm32/page.h |    4 ----
 xen/include/asm-arm/arm64/page.h |    4 ----
 2 files changed, 0 insertions(+), 8 deletions(-)

diff --git a/xen/include/asm-arm/arm32/page.h b/xen/include/asm-arm/arm32/page.h
index 38bcffd..cf12a89 100644
--- a/xen/include/asm-arm/arm32/page.h
+++ b/xen/include/asm-arm/arm32/page.h
@@ -16,10 +16,6 @@ static inline void write_pte(lpae_t *p, lpae_t pte)
         /* Safely write the entry (STRD is atomic on CPUs that support LPAE) */
         "strd %0, %H0, [%1];"
         "dsb;"
-        /* Push this cacheline to the PoC so the rest of the system sees it. */
-        STORE_CP32(1, DCCMVAC)
-        /* Ensure that the data flush is completed before proceeding */
-        "dsb;"
         : : "r" (pte.bits), "r" (p) : "memory");
 }
 
diff --git a/xen/include/asm-arm/arm64/page.h b/xen/include/asm-arm/arm64/page.h
index bd48fe3..9551f90 100644
--- a/xen/include/asm-arm/arm64/page.h
+++ b/xen/include/asm-arm/arm64/page.h
@@ -11,10 +11,6 @@ static inline void write_pte(lpae_t *p, lpae_t pte)
         "dsb sy;"
         "str %0, [%1];"         /* Write the entry */
         "dsb sy;"
-        /* Push this cacheline to the PoC so the rest of the system sees it. */
-        "dc cvac, %1;"
-        /* Ensure that the data flush is completed before proceeding */
-        "dsb sy;"
         : : "r" (pte.bits), "r" (p) : "memory");
 }
 
--
generated by git-patchbot for /home/xen/git/xen.git#master

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