[PATCH] Revert "riscv: mm: accelerate pagefault when badaccess"

[PATCH] Revert "riscv: mm: accelerate pagefault when badaccess"

[Palmer Dabbelt]

From: Palmer Dabbelt <palmer@rivosinc.com>

I accidentally picked up an earlier version of this patch, which had
already landed via mm.  The patch  I picked up contains a bug, which I
kept as I thought it was a fix.  So let's just revert it.

This reverts commit 4c6c0020427a4547845a83f7e4d6085e16c3e24f.

Fixes: 4c6c0020427a ("riscv: mm: accelerate pagefault when badaccess")
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
---
 arch/riscv/mm/fault.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/riscv/mm/fault.c b/arch/riscv/mm/fault.c
index b3fcf7d67efb..5224f3733802 100644
--- a/arch/riscv/mm/fault.c
+++ b/arch/riscv/mm/fault.c
@@ -293,8 +293,8 @@ void handle_page_fault(struct pt_regs *regs)
 	if (unlikely(access_error(cause, vma))) {
 		vma_end_read(vma);
 		count_vm_vma_lock_event(VMA_LOCK_SUCCESS);
-		tsk->thread.bad_cause = SEGV_ACCERR;
-		bad_area_nosemaphore(regs, code, addr);
+		tsk->thread.bad_cause = cause;
+		bad_area_nosemaphore(regs, SEGV_ACCERR, addr);
 		return;
 	}
 
-- 
2.45.1


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Re: [PATCH] Revert "riscv: mm: accelerate pagefault when badaccess"

[Kefeng Wang]

On 2024/5/31 0:44, Palmer Dabbelt wrote:
> From: Palmer Dabbelt <palmer@rivosinc.com>
> 
> I accidentally picked up an earlier version of this patch, which had
> already landed via mm.  The patch  I picked up contains a bug, which I
> kept as I thought it was a fix.  So let's just revert it.
> 
> This reverts commit 4c6c0020427a4547845a83f7e4d6085e16c3e24f.


Yes, this one is the wrong v1.

Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>


> 
> Fixes: 4c6c0020427a ("riscv: mm: accelerate pagefault when badaccess")
> Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
> ---
>   arch/riscv/mm/fault.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/riscv/mm/fault.c b/arch/riscv/mm/fault.c
> index b3fcf7d67efb..5224f3733802 100644
> --- a/arch/riscv/mm/fault.c
> +++ b/arch/riscv/mm/fault.c
> @@ -293,8 +293,8 @@ void handle_page_fault(struct pt_regs *regs)
>   	if (unlikely(access_error(cause, vma))) {
>   		vma_end_read(vma);
>   		count_vm_vma_lock_event(VMA_LOCK_SUCCESS);
> -		tsk->thread.bad_cause = SEGV_ACCERR;
> -		bad_area_nosemaphore(regs, code, addr);
> +		tsk->thread.bad_cause = cause;
> +		bad_area_nosemaphore(regs, SEGV_ACCERR, addr);
>   		return;
>   	}
>   

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Re: [PATCH] Revert "riscv: mm: accelerate pagefault when badaccess"

[Alexandre Ghiti]

On 30/05/2024 18:44, Palmer Dabbelt wrote:
> From: Palmer Dabbelt <palmer@rivosinc.com>
>
> I accidentally picked up an earlier version of this patch, which had
> already landed via mm.  The patch  I picked up contains a bug, which I
> kept as I thought it was a fix.  So let's just revert it.
>
> This reverts commit 4c6c0020427a4547845a83f7e4d6085e16c3e24f.
>
> Fixes: 4c6c0020427a ("riscv: mm: accelerate pagefault when badaccess")
> Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
> ---
>   arch/riscv/mm/fault.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/riscv/mm/fault.c b/arch/riscv/mm/fault.c
> index b3fcf7d67efb..5224f3733802 100644
> --- a/arch/riscv/mm/fault.c
> +++ b/arch/riscv/mm/fault.c
> @@ -293,8 +293,8 @@ void handle_page_fault(struct pt_regs *regs)
>   	if (unlikely(access_error(cause, vma))) {
>   		vma_end_read(vma);
>   		count_vm_vma_lock_event(VMA_LOCK_SUCCESS);
> -		tsk->thread.bad_cause = SEGV_ACCERR;
> -		bad_area_nosemaphore(regs, code, addr);
> +		tsk->thread.bad_cause = cause;
> +		bad_area_nosemaphore(regs, SEGV_ACCERR, addr);
>   		return;
>   	}
>   


Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>


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Re: [PATCH] Revert "riscv: mm: accelerate pagefault when badaccess"

[patchwork-bot+linux-riscv]

Hello:

This patch was applied to riscv/linux.git (fixes)
by Palmer Dabbelt <palmer@rivosinc.com>:

On Thu, 30 May 2024 09:44:51 -0700 you wrote:
> From: Palmer Dabbelt <palmer@rivosinc.com>
> 
> I accidentally picked up an earlier version of this patch, which had
> already landed via mm.  The patch  I picked up contains a bug, which I
> kept as I thought it was a fix.  So let's just revert it.
> 
> This reverts commit 4c6c0020427a4547845a83f7e4d6085e16c3e24f.
> 
> [...]

Here is the summary with links:
  - Revert "riscv: mm: accelerate pagefault when badaccess"
    https://git.kernel.org/riscv/c/7932b172ac7e

You are awesome, thank you!
-- 
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