[PATCH RFC] mm: Add debug_virt_to_phys()
f.fainelli at gmail.com
Sat Nov 12 11:29:38 PST 2016
Le 11/11/2016 à 21:43, Will Deacon a écrit :
> On Fri, Nov 11, 2016 at 04:44:43PM -0800, Florian Fainelli wrote:
>> When CONFIG_DEBUG_VM is turned on, virt_to_phys() maps to
>> debug_virt_to_phys() which helps catch vmalloc space addresses being
>> passed. This is helpful in debugging bogus drivers that just assume
>> linear mappings all over the place.
>> For ARM, ARM64, Unicore32 and Microblaze, the architectures define
>> __virt_to_phys() as being the functional implementation of the address
>> translation, so we special case the debug stub to call into
>> __virt_to_phys directly.
>> Signed-off-by: Florian Fainelli <f.fainelli at gmail.com>
>> arch/arm/include/asm/memory.h | 4 ++++
>> arch/arm64/include/asm/memory.h | 4 ++++
>> include/asm-generic/memory_model.h | 4 ++++
>> mm/debug.c | 15 +++++++++++++++
>> 4 files changed, 27 insertions(+)
> What's the interaction between this and the DEBUG_VIRTUAL patches from Laura?
> They seem to be tackling the exact same problem afaict.
Indeed thanks for pointing that out, I guess I could piggy back on this
patchset and try to cover ARM.
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