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| author | Laura Abbott <labbott@fedoraproject.org> | 2016-02-05 16:24:47 -0800 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2016-02-16 15:40:30 +0000 |
| commit | 83863f25e4b8214e994ef8b5647aad614d74b45d (patch) | |
| tree | def928e193b847e4035a6d895efafc9f9b881896 /arch/arm64/Kconfig | |
| parent | 132233a759580f5ce9b1bfaac9073e47d03c460d (diff) | |
| download | lwn-83863f25e4b8214e994ef8b5647aad614d74b45d.tar.gz lwn-83863f25e4b8214e994ef8b5647aad614d74b45d.zip | |
arm64: Add support for ARCH_SUPPORTS_DEBUG_PAGEALLOC
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>
Diffstat (limited to 'arch/arm64/Kconfig')
| -rw-r--r-- | arch/arm64/Kconfig | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 53e48a617fef..5a1f2e47d153 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -537,6 +537,9 @@ config HOTPLUG_CPU source kernel/Kconfig.preempt source kernel/Kconfig.hz +config ARCH_SUPPORTS_DEBUG_PAGEALLOC + def_bool y + config ARCH_HAS_HOLES_MEMORYMODEL def_bool y if SPARSEMEM |