From mboxrd@z Thu Jan 1 00:00:00 1970 From: will.deacon@arm.com (Will Deacon) Date: Sat, 12 Nov 2016 05:43:19 +0000 Subject: [PATCH RFC] mm: Add debug_virt_to_phys() In-Reply-To: <20161112004449.30566-1-f.fainelli@gmail.com> References: <20161112004449.30566-1-f.fainelli@gmail.com> Message-ID: <20161112054318.GB24127@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 > --- > 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? http://lkml.kernel.org/r/20161102210054.16621-7-labbott at redhat.com They seem to be tackling the exact same problem afaict. Will