arm64: Add support for ARCH_SUPPORTS_DEBUG_PAGEALLOC

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ARCH_SUPPORTS_DEBUG_PAGEALLOC provides a hook to map and unmap
pages for debugging purposes. This requires memory be mapped
with PAGE_SIZE mappings since breaking down larger mappings
at runtime will lead to TLB conflicts. Check if debug_pagealloc
is enabled at runtime and if so, map everyting with PAGE_SIZE
pages. Implement the functions to actually map/unmap the
pages at runtime.

Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Laura Abbott <labbott@fedoraproject.org>
[catalin.marinas@arm.com: static annotation block_mappings_allowed() and #ifdef]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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Laura Abbott 2016-02-05 16:24:47 -08:00 • committed by Catalin Marinas

parent 132233a759

commit 83863f25e4

3 changed files with 63 additions and 12 deletions

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3

arch/arm64/Kconfig

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26

arch/arm64/mm/mmu.c

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46

arch/arm64/mm/pageattr.c

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