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

[Mark Rutland]

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 at arm.com>
Cc: Andy Lutomirski <luto at kernel.org>
Cc: Catalin Marinas <catalin.marinas at arm.com>
Cc: Jinjie Ruan <ruanjinjie at huawei.com>
Cc: Peter Zijlstra <peterz at infradead.org>
Cc: Thomas Gleixner <tglx at kernel.org>
Cc: Vladimir Murzin <vladimir.murzin at arm.com>
Cc: Will Deacon <will at 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);
 }
 
 /*
-- 
2.30.2