From: Will Deacon <will.deacon@arm.com>
To: Florian Fainelli <f.fainelli@gmail.com>
Cc: linux-kernel@vger.kernel.org,
Russell King <linux@armlinux.org.uk>,
Catalin Marinas <catalin.marinas@arm.com>,
Arnd Bergmann <arnd@arndb.de>,
Nicolas Pitre <nicolas.pitre@linaro.org>,
Chris Brandt <chris.brandt@renesas.com>,
Pratyush Anand <panand@redhat.com>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Mark Rutland <mark.rutland@arm.com>,
James Morse <james.morse@arm.com>,
Neeraj Upadhyay <neeraju@codeaurora.org>,
Laura Abbott <labbott@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Vlastimil Babka <vbabka@suse.cz>, Michal Hocko <mhocko@suse.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Jerome Marchand <jmarchan@redhat.com>,
Konstantin Khlebnikov <koct9i@gmail.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
"moderated list:ARM PORT" <linux-arm-kernel@lists.infradead.org>,
"open list:GENERIC INCLUDE/ASM HEADER FILES"
<linux-arch@vger.kernel.org>
Subject: Re: [PATCH RFC] mm: Add debug_virt_to_phys()
Date: Sat, 12 Nov 2016 05:43:19 +0000 [thread overview]
Message-ID: <20161112054318.GB24127@arm.com> (raw)
In-Reply-To: <20161112004449.30566-1-f.fainelli@gmail.com>
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@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?
http://lkml.kernel.org/r/20161102210054.16621-7-labbott@redhat.com
They seem to be tackling the exact same problem afaict.
Will
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WARNING: multiple messages have this Message-ID (diff)
From: Will Deacon <will.deacon@arm.com>
To: Florian Fainelli <f.fainelli@gmail.com>
Cc: linux-kernel@vger.kernel.org,
Russell King <linux@armlinux.org.uk>,
Catalin Marinas <catalin.marinas@arm.com>,
Arnd Bergmann <arnd@arndb.de>,
Nicolas Pitre <nicolas.pitre@linaro.org>,
Chris Brandt <chris.brandt@renesas.com>,
Pratyush Anand <panand@redhat.com>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Mark Rutland <mark.rutland@arm.com>,
James Morse <james.morse@arm.com>,
Neeraj Upadhyay <neeraju@codeaurora.org>,
Laura Abbott <labbott@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Vlastimil Babka <vbabka@suse.cz>, Michal Hocko <mhocko@suse.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Jerome Marchand <jmarchan@redhat.com>,
Konstantin Khlebnikov <koct9i@gmail.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
"moderated list:ARM PORT" <linux-arm-kernel@lists.infradead.org>,
"open list:GENERIC INCLUDE/ASM HEADER FILES"
<linux-arch@vger.kernel.org>,
"open list:MEMORY MANAGEMENT" <linux-mm@kvack.org>
Subject: Re: [PATCH RFC] mm: Add debug_virt_to_phys()
Date: Sat, 12 Nov 2016 05:43:19 +0000 [thread overview]
Message-ID: <20161112054318.GB24127@arm.com> (raw)
Message-ID: <20161112054319.RocrLbw_5mG_0vGQUK7MTz-eG4baLgQ2NxG73zV_tg0@z> (raw)
In-Reply-To: <20161112004449.30566-1-f.fainelli@gmail.com>
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@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?
http://lkml.kernel.org/r/20161102210054.16621-7-labbott@redhat.com
They seem to be tackling the exact same problem afaict.
Will
WARNING: multiple messages have this Message-ID (diff)
From: will.deacon@arm.com (Will Deacon)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH RFC] mm: Add debug_virt_to_phys()
Date: Sat, 12 Nov 2016 05:43:19 +0000 [thread overview]
Message-ID: <20161112054318.GB24127@arm.com> (raw)
In-Reply-To: <20161112004449.30566-1-f.fainelli@gmail.com>
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@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?
http://lkml.kernel.org/r/20161102210054.16621-7-labbott at redhat.com
They seem to be tackling the exact same problem afaict.
Will
WARNING: multiple messages have this Message-ID (diff)
From: Will Deacon <will.deacon@arm.com>
To: Florian Fainelli <f.fainelli@gmail.com>
Cc: linux-kernel@vger.kernel.org,
Russell King <linux@armlinux.org.uk>,
Catalin Marinas <catalin.marinas@arm.com>,
Arnd Bergmann <arnd@arndb.de>,
Nicolas Pitre <nicolas.pitre@linaro.org>,
Chris Brandt <chris.brandt@renesas.com>,
Pratyush Anand <panand@redhat.com>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Mark Rutland <mark.rutland@arm.com>,
James Morse <james.morse@arm.com>,
Neeraj Upadhyay <neeraju@codeaurora.org>,
Laura Abbott <labbott@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Vlastimil Babka <vbabka@suse.cz>, Michal Hocko <mhocko@suse.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Jerome Marchand <jmarchan@redhat.com>,
Konstantin Khlebnikov <koct9i@gmail.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
"moderated list:ARM PORT" <linux-arm-kernel@lists.infradead.org>,
"open list:GENERIC INCLUDE/ASM HEADER FILES"
<linux-arch@vger.kernel.org>,
"open list:MEMORY MANAGEMENT" <linux-mm@kvack.org>
Subject: Re: [PATCH RFC] mm: Add debug_virt_to_phys()
Date: Sat, 12 Nov 2016 05:43:19 +0000 [thread overview]
Message-ID: <20161112054318.GB24127@arm.com> (raw)
In-Reply-To: <20161112004449.30566-1-f.fainelli@gmail.com>
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@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?
http://lkml.kernel.org/r/20161102210054.16621-7-labbott@redhat.com
They seem to be tackling the exact same problem afaict.
Will
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2016-11-12 5:43 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-12 0:44 [PATCH RFC] mm: Add debug_virt_to_phys() Florian Fainelli
2016-11-12 0:44 ` Florian Fainelli
2016-11-12 0:44 ` Florian Fainelli
2016-11-12 0:44 ` Florian Fainelli
2016-11-12 0:44 ` Florian Fainelli
2016-11-12 1:49 ` Nicolas Pitre
2016-11-12 1:49 ` Nicolas Pitre
2016-11-12 1:49 ` Nicolas Pitre
2016-11-12 1:49 ` Nicolas Pitre
2016-11-12 3:39 ` Florian Fainelli
2016-11-12 3:39 ` Florian Fainelli
2016-11-12 3:39 ` Florian Fainelli
2016-11-12 3:39 ` Florian Fainelli
2016-11-12 16:32 ` Nicolas Pitre
2016-11-12 16:32 ` Nicolas Pitre
2016-11-12 16:32 ` Nicolas Pitre
2016-11-12 16:32 ` Nicolas Pitre
2016-11-12 5:43 ` Will Deacon [this message]
2016-11-12 5:43 ` Will Deacon
2016-11-12 5:43 ` Will Deacon
2016-11-12 5:43 ` Will Deacon
2016-11-12 19:29 ` Florian Fainelli
2016-11-12 19:29 ` Florian Fainelli
2016-11-12 19:29 ` Florian Fainelli
2016-11-12 19:29 ` Florian Fainelli
2016-11-14 18:45 ` Laura Abbott
2016-11-14 18:45 ` Laura Abbott
2016-11-14 18:45 ` Laura Abbott
2016-11-14 18:45 ` Laura Abbott
2016-11-14 19:23 ` Florian Fainelli
2016-11-14 19:23 ` Florian Fainelli
2016-11-14 19:23 ` Florian Fainelli
2016-11-14 19:23 ` Florian Fainelli
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