diff options
| author | Vineet Gupta | 2013-04-12 15:32:06 +0530 |
|---|---|---|
| committer | Vineet Gupta | 2013-05-07 19:08:14 +0530 |
| commit | 764531cc5a9261de9f74fd85c30dfb7837af2797 (patch) | |
| tree | d0dea2be2f405413d808de1399634b7366a179a2 /arch/arc | |
| parent | 7f250a0fa1cc7f8d97560f4ea36eae38c17eb648 (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.c | 15 |
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) |