[PATCH] arm64: mm: Pass origial fault address to handle_mm_fault()

Subsystems: arm64 port (aarch64 architecture), the rest

STALE1876d LANDED

Landed in mainline as 84c5e23edecd on 2021-06-15.

4 messages, 4 authors, 2021-06-15 · open the first message on its own page

[PATCH] arm64: mm: Pass origial fault address to handle_mm_fault()

From: Gavin Shan <hidden>
Date: 2021-06-14 10:26:11

Currently, the lower bits of fault address is cleared before it's
passed to handle_mm_fault(). It's unnecessary since generic code
does same thing since the commit 1a29d85eb0f19 ("mm: use vmf->address
instead of of vmf->virtual_address").

This passes the original fault address to handle_mm_fault() in case
the generic code needs to know the exact fault address.

Signed-off-by: Gavin Shan <redacted>
---
 arch/arm64/mm/fault.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index 871c82ab0a30..e2883237216d 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c

@@ -504,7 +504,7 @@ static vm_fault_t __do_page_fault(struct mm_struct *mm, unsigned long addr,
 	 */
 	if (!(vma->vm_flags & vm_flags))
 		return VM_FAULT_BADACCESS;
-	return handle_mm_fault(vma, addr & PAGE_MASK, mm_flags, regs);
+	return handle_mm_fault(vma, addr, mm_flags, regs);
 }
 
 static bool is_el0_instruction_abort(unsigned int esr)

-- 
2.23.0


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Re: [PATCH] arm64: mm: Pass origial fault address to handle_mm_fault()

From: Catalin Marinas <catalin.marinas@arm.com>
Date: 2021-06-14 15:42:45

On Mon, Jun 14, 2021 at 08:27:01PM +0800, Gavin Shan wrote:

quoted hunk

Currently, the lower bits of fault address is cleared before it's
passed to handle_mm_fault(). It's unnecessary since generic code
does same thing since the commit 1a29d85eb0f19 ("mm: use vmf->address
instead of of vmf->virtual_address").

This passes the original fault address to handle_mm_fault() in case
the generic code needs to know the exact fault address.

Signed-off-by: Gavin Shan <redacted>
---
 arch/arm64/mm/fault.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index 871c82ab0a30..e2883237216d 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c

@@ -504,7 +504,7 @@ static vm_fault_t __do_page_fault(struct mm_struct *mm, unsigned long addr,
 	 */
 	if (!(vma->vm_flags & vm_flags))
 		return VM_FAULT_BADACCESS;
-	return handle_mm_fault(vma, addr & PAGE_MASK, mm_flags, regs);
+	return handle_mm_fault(vma, addr, mm_flags, regs);

This seems to match most of the other architectures (arch/arm also masks
out the bottom bits). So:

Acked-by: Catalin Marinas <catalin.marinas@arm.com>

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Re: [PATCH] arm64: mm: Pass origial fault address to handle_mm_fault()

From: Anshuman Khandual <hidden>
Date: 2021-06-15 11:10:26


On 6/14/21 5:57 PM, Gavin Shan wrote:

quoted hunk

Currently, the lower bits of fault address is cleared before it's
passed to handle_mm_fault(). It's unnecessary since generic code
does same thing since the commit 1a29d85eb0f19 ("mm: use vmf->address
instead of of vmf->virtual_address").

This passes the original fault address to handle_mm_fault() in case
the generic code needs to know the exact fault address.

Signed-off-by: Gavin Shan <redacted>
---
 arch/arm64/mm/fault.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index 871c82ab0a30..e2883237216d 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c

@@ -504,7 +504,7 @@ static vm_fault_t __do_page_fault(struct mm_struct *mm, unsigned long addr,
 	 */
 	if (!(vma->vm_flags & vm_flags))
 		return VM_FAULT_BADACCESS;
-	return handle_mm_fault(vma, addr & PAGE_MASK, mm_flags, regs);
+	return handle_mm_fault(vma, addr, mm_flags, regs);
 }
 
 static bool is_el0_instruction_abort(unsigned int esr)

FWIW

Reviewed-by: Anshuman Khandual <redacted>

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Re: [PATCH] arm64: mm: Pass origial fault address to handle_mm_fault()

From: Will Deacon <will@kernel.org>
Date: 2021-06-15 12:07:10

On Mon, 14 Jun 2021 20:27:01 +0800, Gavin Shan wrote:

Currently, the lower bits of fault address is cleared before it's
passed to handle_mm_fault(). It's unnecessary since generic code
does same thing since the commit 1a29d85eb0f19 ("mm: use vmf->address
instead of of vmf->virtual_address").

This passes the original fault address to handle_mm_fault() in case
the generic code needs to know the exact fault address.

Applied to arm64 (for-next/mm), thanks!

[1/1] arm64: mm: Pass origial fault address to handle_mm_fault()
      https://git.kernel.org/arm64/c/84c5e23edecd

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev

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