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authorVineet Gupta <vgupta@synopsys.com>2013-04-12 15:32:06 +0530
committerVineet Gupta <vgupta@synopsys.com>2013-05-07 19:08:14 +0530
commit764531cc5a9261de9f74fd85c30dfb7837af2797 (patch)
treed0dea2be2f405413d808de1399634b7366a179a2 /arch/arc
parent7f250a0fa1cc7f8d97560f4ea36eae38c17eb648 (diff)
ARC: [mm] micro-optimize page size icache invalidate
start address is already page aligned and size is const PAGE_SIZE, thus fixups for alignment not needed in generated code. bloat-o-meter vmlinux-mm5 vmlinux add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-32 (-32) function old new delta __inv_icache_page 82 50 -32 Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc')
-rw-r--r--arch/arc/mm/cache_arc700.c15
1 files changed, 12 insertions, 3 deletions
diff --git a/arch/arc/mm/cache_arc700.c b/arch/arc/mm/cache_arc700.c
index da9de401681d..3a9ef63b1a97 100644
--- a/arch/arc/mm/cache_arc700.c
+++ b/arch/arc/mm/cache_arc700.c
@@ -406,9 +406,18 @@ static void __ic_line_inv_vaddr(unsigned long phy_start, unsigned long vaddr,
int num_lines, slack;
unsigned int addr;
- slack = phy_start & ~ICACHE_LINE_MASK;
- sz += slack;
- phy_start -= slack;
+ /*
+ * Ensure we properly floor/ceil the non-line aligned/sized requests:
+ * However page sized flushes can be compile time optimised.
+ * -@phy_start will be cache-line aligned already (being page aligned)
+ * -@sz will be integral multiple of line size (being page sized).
+ */
+ if (!(__builtin_constant_p(sz) && sz == PAGE_SIZE)) {
+ slack = phy_start & ~ICACHE_LINE_MASK;
+ sz += slack;
+ phy_start -= slack;
+ }
+
num_lines = DIV_ROUND_UP(sz, ARC_ICACHE_LINE_LEN);
#if (CONFIG_ARC_MMU_VER > 2)