ARM: cache-v7: consolidate initialisation of cache level index

Both v7_flush_cache_louis and v7_flush_dcache_all both begin the
flush_levels loop with r10 initialised to zero.  In each case, this
is done immediately prior to entering the loop.  Branch to this
instruction in v7_flush_dcache_all from v7_flush_cache_louis and
eliminate the unnecessary initialisation in v7_flush_cache_louis.

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/mm/cache-v7.S b/arch/arm/mm/cache-v7.S
index d062f8c..5b5d0c0 100644 (file)
--- a/arch/arm/mm/cache-v7.S
+++ b/arch/arm/mm/cache-v7.S
@@ -103,8 +103,7 @@ ALT_UP(     mov     r3, r0, lsr #26)                @ move LoUU into position
        moveqs  r3, #1 << 1                     @   fix LoUIS value (and set flags state to 'ne')
 #endif
        reteq   lr                              @ return if level == 0
-       mov     r10, #0                         @ r10 (starting level) = 0
-       b       flush_levels                    @ start flushing cache levels
+       b       start_flush_levels              @ start flushing cache levels
 ENDPROC(v7_flush_dcache_louis)
 
 /*
@@ -122,6 +121,7 @@ ENTRY(v7_flush_dcache_all)
        mov     r3, r0, lsr #23                 @ move LoC into position
        ands    r3, r3, #7 << 1                 @ extract LoC*2 from clidr
        beq     finished                        @ if loc is 0, then no need to clean
+start_flush_levels:
        mov     r10, #0                         @ start clean at cache level 0
 flush_levels:
        add     r2, r10, r10, lsr #1            @ work out 3x current cache level