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Commit 764531cc authored by Vineet Gupta's avatar Vineet Gupta
Browse files

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: default avatarVineet Gupta <vgupta@synopsys.com>
parent 7f250a0f

arch/arc/mm/cache_arc700.c

+12 −3
Original line number Diff line number Diff line
@@ -406,9 +406,18 @@ static void __ic_line_inv_vaddr(unsigned long phy_start, unsigned long vaddr, 
	int num_lines, slack;

	unsigned int addr;



	/*

	 * 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)