From: Vineet Gupta <vgupta@synopsys.com>
Date: Fri, 12 Apr 2013 06:48:25 +0000 (+0530)
Subject: ARC: [mm] optimise icache flush for kernel mappings
X-Git-Tag: v3.10-rc1~25^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7586bf7286097cd47299c44192c30e01f0d55391;p=pandora-kernel.git

ARC: [mm] optimise icache flush for kernel mappings

This change continues the theme from prev commit - this time icache
handling for kernel's own code modification (vmalloc: loadable modules,
breakpoints for kprobes/kgdb...)

flush_icache_range() calls the CDU icache helper with vaddr to enable
exact line invalidate.

For a true kernel-virtual mapping, the vaddr is actually virtual hence
valid as index into cache. For kprobes breakpoint however, the vaddr arg
is actually paddr - since that's how normal kernel is mapped in ARC
memory map.  This implies that CDU will use the same addr for
indexing as for tag match - which is fine since kernel code would only
have that "implicit" mapping and none other.

This should speed up module loading significantly - specially on default
ARC700 icache configurations (32k) which alias.

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
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