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alpha: marvel: make use of raw_spinlock variants

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The alpha/marvel code currently implements an irq_chip for handling
interrupts; due to how irq_chip handling is done, it's necessary for the
irq_chip methods to be invoked from hardirq context, even on a a
real-time kernel.  Because the spinlock_t type becomes a "sleeping"
spinlock w/ RT kernels, it is not suitable to be used with irq_chips.

A quick audit of the operations under the lock reveal that they do only
minimal, bounded work, and are therefore safe to do under a raw spinlock.

Signed-off-by: Julia Cartwright <julia@ni.com>
Signed-off-by: Matt Turner <mattst88@gmail.com>
This commit is contained in:
Julia Cartwright 2017-03-21 17:43:02 -05:00 committed by Matt Turner
parent beb1057feb
commit b5a3a128b4
3 changed files with 8 additions and 8 deletions
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2
arch/alpha/include/asm/core_marvel.h
View File

@ -312,7 +312,7 @@ struct io7 {
io7_port7_csrs *csrs;
struct io7_port ports[IO7_NUM_PORTS];
spinlock_t irq_lock;
raw_spinlock_t irq_lock;
};
#ifndef __EXTERN_INLINE

2
arch/alpha/kernel/core_marvel.c
View File

@ -118,7 +118,7 @@ alloc_io7(unsigned int pe)
io7 = alloc_bootmem(sizeof(*io7));
io7->pe = pe;
spin_lock_init(&io7->irq_lock);
raw_spin_lock_init(&io7->irq_lock);
for (h = 0; h < 4; h++) {
io7->ports[h].io7 = io7;

12
arch/alpha/kernel/sys_marvel.c
View File

@ -115,11 +115,11 @@ io7_enable_irq(struct irq_data *d)
return;
}
spin_lock(&io7->irq_lock);
raw_spin_lock(&io7->irq_lock);
*ctl |= 1UL << 24;
mb();
*ctl;
spin_unlock(&io7->irq_lock);
raw_spin_unlock(&io7->irq_lock);
}
static void
@ -136,11 +136,11 @@ io7_disable_irq(struct irq_data *d)
return;
}
spin_lock(&io7->irq_lock);
raw_spin_lock(&io7->irq_lock);
*ctl &= ~(1UL << 24);
mb();
*ctl;
spin_unlock(&io7->irq_lock);
raw_spin_unlock(&io7->irq_lock);
}
static void
@ -263,7 +263,7 @@ init_io7_irqs(struct io7 *io7,
*/
printk(" Interrupts reported to CPU at PE %u\n", boot_cpuid);
spin_lock(&io7->irq_lock);
raw_spin_lock(&io7->irq_lock);
/* set up the error irqs */
io7_redirect_irq(io7, &io7->csrs->HLT_CTL.csr, boot_cpuid);
@ -295,7 +295,7 @@ init_io7_irqs(struct io7 *io7,
for (i = 0; i < 16; ++i)
init_one_io7_msi(io7, i, boot_cpuid);
spin_unlock(&io7->irq_lock);
raw_spin_unlock(&io7->irq_lock);
}
static void __init