powerpc/64: Avoid isync in flush_dcache_range()

As per ISA an isync is only needed on instruction cache block
invalidate. Remove the same from dcache invalidate.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200320103242.229223-1-aneesh.kumar@linux.ibm.com

diff --git a/arch/powerpc/include/asm/cacheflush.h b/arch/powerpc/include/asm/cacheflush.h
index 4a1c9f0200e1bf7389956409803a326e65264e19..e92191b390f3101b445a5235efb9d514f2696974 100644 (file)
--- a/arch/powerpc/include/asm/cacheflush.h
+++ b/arch/powerpc/include/asm/cacheflush.h
@@ -65,17 +65,13 @@ static inline void flush_dcache_range(unsigned long start, unsigned long stop)
        unsigned long size = stop - (unsigned long)addr + (bytes - 1);
        unsigned long i;
 
-       if (IS_ENABLED(CONFIG_PPC64)) {
+       if (IS_ENABLED(CONFIG_PPC64))
                mb();   /* sync */
-               isync();
-       }
 
        for (i = 0; i < size >> shift; i++, addr += bytes)
                dcbf(addr);
        mb();   /* sync */
 
-       if (IS_ENABLED(CONFIG_PPC64))
-               isync();
 }
 
 /*