linux

iv/linux

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Vineet Gupta 7586bf7286 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>

2013-05-07 19:08:12 +05:30

cache_arc700.c

ARC: [mm] optimise icache flush for kernel mappings

2013-05-07 19:08:12 +05:30

dma.c

ARC: I/O and DMA Mappings

2013-02-15 23:15:54 +05:30

extable.c

ARC: Fix coding style issues

2013-04-09 12:21:14 +05:30

fault.c

ARC: Remove unneeded version.h header include