Commit a07b7b21 authored by Mark Rutland's avatar Mark Rutland Committed by Catalin Marinas
Browse files

arm64: entry: Use irqentry_{enter_from,exit_to}_kernel_mode() 



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: default avatarMark Rutland <mark.rutland@arm.com>
Cc: Andy Lutomirski <luto@kernel.org>
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>
Reviewed-by: default avatarJinjie Ruan <ruanjinjie@huawei.com>
Acked-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent 6879ef13

arch/arm64/kernel/entry-common.c

+2 −2
Original line number Diff line number Diff line
@@ -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);

}



/*