alpha: marvel: make use of raw_spinlock variants
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>
diff --git a/arch/alpha/include/asm/core_marvel.h b/arch/alpha/include/asm/core_marvel.h
index dad300f..8dcf9db 100644
--- a/arch/alpha/include/asm/core_marvel.h
+++ b/arch/alpha/include/asm/core_marvel.h
@@ -312,7 +312,7 @@
io7_port7_csrs *csrs;
struct io7_port ports[IO7_NUM_PORTS];
- spinlock_t irq_lock;
+ raw_spinlock_t irq_lock;
};
#ifndef __EXTERN_INLINE
diff --git a/arch/alpha/kernel/core_marvel.c b/arch/alpha/kernel/core_marvel.c
index 03ff832..b10c316 100644
--- a/arch/alpha/kernel/core_marvel.c
+++ b/arch/alpha/kernel/core_marvel.c
@@ -118,7 +118,7 @@
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;
diff --git a/arch/alpha/kernel/sys_marvel.c b/arch/alpha/kernel/sys_marvel.c
index 24e41bd..3e53392 100644
--- a/arch/alpha/kernel/sys_marvel.c
+++ b/arch/alpha/kernel/sys_marvel.c
@@ -115,11 +115,11 @@
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 @@
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 @@
*/
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 @@
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