[PATH V3] arm64: mm: Optimise tlb flush logic where we have >4K granule
catalin.marinas at arm.com
Fri May 9 09:01:45 PDT 2014
On Fri, May 02, 2014 at 02:49:00PM +0100, Steve Capper wrote:
> The tlb maintainence functions: __cpu_flush_user_tlb_range and
> __cpu_flush_kern_tlb_range do not take into consideration the page
> granule when looping through the address range, and repeatedly flush
> tlb entries for the same page when operating with 64K pages.
> This patch re-works the logic s.t. we instead advance the loop by
> 1 << (PAGE_SHIFT - 12), so avoid repeating ourselves.
> Also the routines have been converted from assembler to static inline
> functions to aid with legibility and potential compiler optimisations.
> The isb() has been removed from flush_tlb_kernel_range(.) as it is
> only needed when changing the execute permission of a mapping. If one
> needs to set an area of the kernel as execute/non-execute an isb()
> must be inserted after the call to flush_tlb_kernel_range.
> Cc: Laura Abbott <lauraa at codeaurora.org>
> Signed-off-by: Steve Capper <steve.capper at linaro.org>
> Acked-by: Will Deacon <will.deacon at arm.com>
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