[PATCH] Revert "arm: mm: qsd8x50: Fix incorrect permission faults"
Kefeng Wang
wangkefeng.wang at huawei.com
Wed Jun 2 08:14:51 PDT 2021
Hi Russell, any comment about this patch, thanks.
On 2021/5/28 15:44, Kefeng Wang wrote:
> This reverts commit e220ba60223a9d63e70217e5b112160df8c21cea.
>
> The VERIFY_PERMISSION_FAULT is introduced since 2009 but no
> one use it, just revert it and clean unused comment.
>
> Signed-off-by: Kefeng Wang <wangkefeng.wang at huawei.com>
> ---
> arch/arm/mm/Kconfig | 2 --
> arch/arm/mm/abort-ev7.S | 26 --------------------------
> 2 files changed, 28 deletions(-)
>
> diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
> index 35f43d0aa056..8355c3895894 100644
> --- a/arch/arm/mm/Kconfig
> +++ b/arch/arm/mm/Kconfig
> @@ -601,8 +601,6 @@ config CPU_TLB_V6
> config CPU_TLB_V7
> bool
>
> -config VERIFY_PERMISSION_FAULT
> - bool
> endif
>
> config CPU_HAS_ASID
> diff --git a/arch/arm/mm/abort-ev7.S b/arch/arm/mm/abort-ev7.S
> index f7cc5d68444b..f81bceacc660 100644
> --- a/arch/arm/mm/abort-ev7.S
> +++ b/arch/arm/mm/abort-ev7.S
> @@ -17,31 +17,5 @@ ENTRY(v7_early_abort)
> mrc p15, 0, r1, c5, c0, 0 @ get FSR
> mrc p15, 0, r0, c6, c0, 0 @ get FAR
> uaccess_disable ip @ disable userspace access
> -
> - /*
> - * V6 code adjusts the returned DFSR.
> - * New designs should not need to patch up faults.
> - */
> -
> -#if defined(CONFIG_VERIFY_PERMISSION_FAULT)
> - /*
> - * Detect erroneous permission failures and fix
> - */
> - ldr r3, =0x40d @ On permission fault
> - and r3, r1, r3
> - cmp r3, #0x0d
> - bne do_DataAbort
> -
> - mcr p15, 0, r0, c7, c8, 0 @ Retranslate FAR
> - isb
> - mrc p15, 0, ip, c7, c4, 0 @ Read the PAR
> - and r3, ip, #0x7b @ On translation fault
> - cmp r3, #0x0b
> - bne do_DataAbort
> - bic r1, r1, #0xf @ Fix up FSR FS[5:0]
> - and ip, ip, #0x7e
> - orr r1, r1, ip, LSR #1
> -#endif
> -
> b do_DataAbort
> ENDPROC(v7_early_abort)
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