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* [PATCH] arm64/mm: remove unnecessary boundary check
@ 2016-02-25  3:44 ` miles.chen
  0 siblings, 0 replies; 8+ messages in thread
From: miles.chen @ 2016-02-25  3:44 UTC (permalink / raw)
  To: Catalin Marinas, Will Deacon
  Cc: linux-arm-kernel, linux-kernel, srv_wsdupstream, linux-mediatek,
	Miles Chen

From: Miles Chen <miles.chen@mediatek.com>

Remove the unnecessary boundary check since there is a huge
gap between user and kernel address that they would never overlap.
(arm64 does not have enough levels of page tables to cover 64-bit
virtual address)

See Documentation/arm64/memory.txt

Signed-off-by: Miles Chen <miles.chen@mediatek.com>
---
 arch/arm64/mm/init.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index f3b061e..4579604 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -343,8 +343,6 @@ void __init mem_init(void)
 #ifdef CONFIG_COMPAT
 	BUILD_BUG_ON(TASK_SIZE_32			> TASK_SIZE_64);
 #endif
-	BUILD_BUG_ON(TASK_SIZE_64			> MODULES_VADDR);
-	BUG_ON(TASK_SIZE_64				> MODULES_VADDR);
 
 	if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) {
 		extern int sysctl_overcommit_memory;
-- 
1.9.1

^ permalink raw reply related	[flat|nested] 8+ messages in thread
* [PATCH] arm64/mm: remove unnecessary boundary check
@ 2016-02-25  3:44 ` miles.chen
  0 siblings, 0 replies; 8+ messages in thread
From: miles.chen @ 2016-02-25  3:44 UTC (permalink / raw)
  To: Catalin Marinas, Will Deacon
  Cc: linux-arm-kernel, linux-kernel, srv_wsdupstream, linux-mediatek,
	Miles Chen

From: Miles Chen <miles.chen@mediatek.com>

Remove the unnecessary boundary check since there is a huge
gap between user and kernel address that they would never overlap.
(arm64 does not have enough levels of page tables to cover 64-bit
virtual address)

See Documentation/arm64/memory.txt

Signed-off-by: Miles Chen <miles.chen@mediatek.com>
---
 arch/arm64/mm/init.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index f3b061e..4579604 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -343,8 +343,6 @@ void __init mem_init(void)
 #ifdef CONFIG_COMPAT
 	BUILD_BUG_ON(TASK_SIZE_32			> TASK_SIZE_64);
 #endif
-	BUILD_BUG_ON(TASK_SIZE_64			> MODULES_VADDR);
-	BUG_ON(TASK_SIZE_64				> MODULES_VADDR);
 
 	if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) {
 		extern int sysctl_overcommit_memory;
-- 
1.9.1

^ permalink raw reply related	[flat|nested] 8+ messages in thread
* [PATCH] arm64/mm: remove unnecessary boundary check
@ 2016-02-25  3:44 ` miles.chen
  0 siblings, 0 replies; 8+ messages in thread
From: miles.chen at mediatek.com @ 2016-02-25  3:44 UTC (permalink / raw)
  To: linux-arm-kernel

From: Miles Chen <miles.chen@mediatek.com>

Remove the unnecessary boundary check since there is a huge
gap between user and kernel address that they would never overlap.
(arm64 does not have enough levels of page tables to cover 64-bit
virtual address)

See Documentation/arm64/memory.txt

Signed-off-by: Miles Chen <miles.chen@mediatek.com>
---
 arch/arm64/mm/init.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index f3b061e..4579604 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -343,8 +343,6 @@ void __init mem_init(void)
 #ifdef CONFIG_COMPAT
 	BUILD_BUG_ON(TASK_SIZE_32			> TASK_SIZE_64);
 #endif
-	BUILD_BUG_ON(TASK_SIZE_64			> MODULES_VADDR);
-	BUG_ON(TASK_SIZE_64				> MODULES_VADDR);
 
 	if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) {
 		extern int sysctl_overcommit_memory;
-- 
1.9.1

^ permalink raw reply related	[flat|nested] 8+ messages in thread
* Re: [PATCH] arm64/mm: remove unnecessary boundary check
  2016-02-25  3:44 ` miles.chen
@ 2016-02-26  9:47   ` Will Deacon
  -1 siblings, 0 replies; 8+ messages in thread
From: Will Deacon @ 2016-02-26  9:47 UTC (permalink / raw)
  To: miles.chen
  Cc: Catalin Marinas, linux-arm-kernel, linux-kernel, srv_wsdupstream,
	linux-mediatek

On Thu, Feb 25, 2016 at 11:44:34AM +0800, miles.chen@mediatek.com wrote:
> From: Miles Chen <miles.chen@mediatek.com>
> 
> Remove the unnecessary boundary check since there is a huge
> gap between user and kernel address that they would never overlap.
> (arm64 does not have enough levels of page tables to cover 64-bit
> virtual address)
> 
> See Documentation/arm64/memory.txt
> 
> Signed-off-by: Miles Chen <miles.chen@mediatek.com>
> ---
>  arch/arm64/mm/init.c | 2 --
>  1 file changed, 2 deletions(-)

Acked-by: Will Deacon <will.deacon@arm.com>

Will

^ permalink raw reply	[flat|nested] 8+ messages in thread
* [PATCH] arm64/mm: remove unnecessary boundary check
@ 2016-02-26  9:47   ` Will Deacon
  0 siblings, 0 replies; 8+ messages in thread
From: Will Deacon @ 2016-02-26  9:47 UTC (permalink / raw)
  To: linux-arm-kernel

On Thu, Feb 25, 2016 at 11:44:34AM +0800, miles.chen at mediatek.com wrote:
> From: Miles Chen <miles.chen@mediatek.com>
> 
> Remove the unnecessary boundary check since there is a huge
> gap between user and kernel address that they would never overlap.
> (arm64 does not have enough levels of page tables to cover 64-bit
> virtual address)
> 
> See Documentation/arm64/memory.txt
> 
> Signed-off-by: Miles Chen <miles.chen@mediatek.com>
> ---
>  arch/arm64/mm/init.c | 2 --
>  1 file changed, 2 deletions(-)

Acked-by: Will Deacon <will.deacon@arm.com>

Will

^ permalink raw reply	[flat|nested] 8+ messages in thread
* Re: [PATCH] arm64/mm: remove unnecessary boundary check
@ 2016-02-26 13:40   ` Catalin Marinas
  0 siblings, 0 replies; 8+ messages in thread
From: Catalin Marinas @ 2016-02-26 13:40 UTC (permalink / raw)
  To: miles.chen
  Cc: Will Deacon, srv_wsdupstream, linux-mediatek, linux-kernel,
	linux-arm-kernel

On Thu, Feb 25, 2016 at 11:44:34AM +0800, miles.chen@mediatek.com wrote:
> From: Miles Chen <miles.chen@mediatek.com>
> 
> Remove the unnecessary boundary check since there is a huge
> gap between user and kernel address that they would never overlap.
> (arm64 does not have enough levels of page tables to cover 64-bit
> virtual address)
> 
> See Documentation/arm64/memory.txt
> 
> Signed-off-by: Miles Chen <miles.chen@mediatek.com>

Applied. Thanks.

-- 
Catalin

^ permalink raw reply	[flat|nested] 8+ messages in thread
* Re: [PATCH] arm64/mm: remove unnecessary boundary check
@ 2016-02-26 13:40   ` Catalin Marinas
  0 siblings, 0 replies; 8+ messages in thread
From: Catalin Marinas @ 2016-02-26 13:40 UTC (permalink / raw)
  To: miles.chen-NuS5LvNUpcJWk0Htik3J/w
  Cc: srv_wsdupstream-NuS5LvNUpcJWk0Htik3J/w,
	linux-mediatek-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r, Will Deacon,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA,
	linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r

On Thu, Feb 25, 2016 at 11:44:34AM +0800, miles.chen-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org wrote:
> From: Miles Chen <miles.chen-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>
> 
> Remove the unnecessary boundary check since there is a huge
> gap between user and kernel address that they would never overlap.
> (arm64 does not have enough levels of page tables to cover 64-bit
> virtual address)
> 
> See Documentation/arm64/memory.txt
> 
> Signed-off-by: Miles Chen <miles.chen-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>

Applied. Thanks.

-- 
Catalin

^ permalink raw reply	[flat|nested] 8+ messages in thread
* [PATCH] arm64/mm: remove unnecessary boundary check
@ 2016-02-26 13:40   ` Catalin Marinas
  0 siblings, 0 replies; 8+ messages in thread
From: Catalin Marinas @ 2016-02-26 13:40 UTC (permalink / raw)
  To: linux-arm-kernel

On Thu, Feb 25, 2016 at 11:44:34AM +0800, miles.chen at mediatek.com wrote:
> From: Miles Chen <miles.chen@mediatek.com>
> 
> Remove the unnecessary boundary check since there is a huge
> gap between user and kernel address that they would never overlap.
> (arm64 does not have enough levels of page tables to cover 64-bit
> virtual address)
> 
> See Documentation/arm64/memory.txt
> 
> Signed-off-by: Miles Chen <miles.chen@mediatek.com>

Applied. Thanks.

-- 
Catalin

^ permalink raw reply	[flat|nested] 8+ messages in thread
end of thread, other threads:[~2016-02-26 13:40 UTC | newest]

Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2016-02-25  3:44 [PATCH] arm64/mm: remove unnecessary boundary check miles.chen
2016-02-25  3:44 ` miles.chen at mediatek.com
2016-02-25  3:44 ` miles.chen
2016-02-26  9:47 ` Will Deacon
2016-02-26  9:47   ` Will Deacon
2016-02-26 13:40 ` Catalin Marinas
2016-02-26 13:40   ` Catalin Marinas
2016-02-26 13:40   ` Catalin Marinas

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