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s390/irq/idle: Remove psw bits early

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Remove wait, io, external interrupt bits early in do_io_irq()/do_ext_irq()
when previous context was idle. This saves one conditional branch and is
closer to the original old assembly code.

Reviewed-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Heiko Carstens
2026-02-18 15:20:09 +01:00
committed by Vasily Gorbik
parent 257c14e5a1
commit d8b5cf9c63
1 changed files with 6 additions and 8 deletions
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14
arch/s390/kernel/irq.c
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@@ -147,8 +147,10 @@ void noinstr do_io_irq(struct pt_regs *regs)
bool from_idle;
from_idle = test_and_clear_cpu_flag(CIF_ENABLED_WAIT);
if (from_idle)
if (from_idle) {
update_timer_idle();
regs->psw.mask &= ~(PSW_MASK_EXT | PSW_MASK_IO | PSW_MASK_WAIT);
}
irq_enter_rcu();
@@ -174,9 +176,6 @@ void noinstr do_io_irq(struct pt_regs *regs)
set_irq_regs(old_regs);
irqentry_exit(regs, state);
if (from_idle)
regs->psw.mask &= ~(PSW_MASK_EXT | PSW_MASK_IO | PSW_MASK_WAIT);
}
void noinstr do_ext_irq(struct pt_regs *regs)
@@ -186,8 +185,10 @@ void noinstr do_ext_irq(struct pt_regs *regs)
bool from_idle;
from_idle = test_and_clear_cpu_flag(CIF_ENABLED_WAIT);
if (from_idle)
if (from_idle) {
update_timer_idle();
regs->psw.mask &= ~(PSW_MASK_EXT | PSW_MASK_IO | PSW_MASK_WAIT);
}
irq_enter_rcu();
@@ -209,9 +210,6 @@ void noinstr do_ext_irq(struct pt_regs *regs)
irq_exit_rcu();
set_irq_regs(old_regs);
irqentry_exit(regs, state);
if (from_idle)
regs->psw.mask &= ~(PSW_MASK_EXT | PSW_MASK_IO | PSW_MASK_WAIT);
}
static void show_msi_interrupt(struct seq_file *p, int irq)