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

Jinjie Ruan
2026-04-08T01:50:54Z

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@arm.com>
> Cc: Andy Lutomirski <luto@kernel.org>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Jinjie Ruan <ruanjinjie@huawei.com>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Thomas Gleixner <tglx@kernel.org>
> Cc: Vladimir Murzin <vladimir.murzin@arm.com>
> Cc: Will Deacon <will@kernel.org>
> ---
> 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@huawei.com>

> }
>
> /*