Re: [PATCH 08/10] arm64: entry: Use irqentry_{enter_from,exit_to}_kernel_mode()

[Jinjie Ruan]

On 2026/4/7 21:16, Mark Rutland wrote:
> The generic irqentry code now provides irqentry_enter_from_kernel_mode()
> and irqentry_exit_to_kernel_mode(), which can be used when an exception
> is known to be taken from kernel mode. These can be inlined into
> architecture-specific entry code, and avoid redundant work to test
> whether the exception was taken from user mode.
> 
> Use these in arm64_enter_from_kernel_mode() and
> arm64_exit_to_kernel_mode(), which are only used for exceptions known to
> be taken from kernel mode. This will remove a small amount of redundant
> work, and will permit further changes to arm64_exit_to_kernel_mode() in
> subsequent patches.
> 
> There should be no funcitonal change as a result of this patch.
> 
> Signed-off-by: Mark Rutland <mark.rutland@xxxxxxx>
> Cc: Andy Lutomirski <luto@xxxxxxxxxx>
> Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
> Cc: Jinjie Ruan <ruanjinjie@xxxxxxxxxx>
> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
> Cc: Thomas Gleixner <tglx@xxxxxxxxxx>
> Cc: Vladimir Murzin <vladimir.murzin@xxxxxxx>
> Cc: Will Deacon <will@xxxxxxxxxx>
> ---
>  arch/arm64/kernel/entry-common.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/kernel/entry-common.c b/arch/arm64/kernel/entry-common.c
> index 3d01cdacdc7a2..16a65987a6a9b 100644
> --- a/arch/arm64/kernel/entry-common.c
> +++ b/arch/arm64/kernel/entry-common.c
> @@ -39,7 +39,7 @@ static noinstr irqentry_state_t arm64_enter_from_kernel_mode(struct pt_regs *reg
>  {
>  	irqentry_state_t state;
>  
> -	state = irqentry_enter(regs);
> +	state = irqentry_enter_from_kernel_mode(regs);
>  	mte_check_tfsr_entry();
>  	mte_disable_tco_entry(current);
>  
> @@ -55,7 +55,7 @@ static void noinstr arm64_exit_to_kernel_mode(struct pt_regs *regs,
>  					      irqentry_state_t state)
>  {
>  	mte_check_tfsr_exit();
> -	irqentry_exit(regs, state);
> +	irqentry_exit_to_kernel_mode(regs, state);

Reviewed-by: Jinjie Ruan <ruanjinjie@xxxxxxxxxx>

>  }
>  
>  /*