This small patch was needed to make the xenU kernel compile
and boot in SMP mode. There are a number of run-time warnings
left, which I will tackle later.
Signed-off-by: Rik van Riel <riel@redhat.com>
--- linux-2.6.10/arch/xen/i386/kernel/smpboot.c.xensmp 2005-01-31
15:32:11.260228265 -0500
+++ linux-2.6.10/arch/xen/i386/kernel/smpboot.c 2005-01-31 14:04:09.300916781
-0500
@@ -437,9 +437,6 @@
int cpucount;
-extern int cpu_idle(void);
-
-
static irqreturn_t local_debug_interrupt(int irq, void *dev_id,
struct pt_regs *regs)
{
@@ -496,7 +493,9 @@
}
}
}
- return cpu_idle();
+ cpu_idle();
+ /* Unreached, cpu_idle() never returns. */
+ return -1;
}
/*
--- linux-2.6.10/include/asm-xen/asm-i386/spinlock.h.xensmp 2005-01-31
14:18:33.000000000 -0500
+++ linux-2.6.10/include/asm-xen/asm-i386/spinlock.h 2005-01-31
14:19:54.693968423 -0500
@@ -212,6 +212,16 @@
#define _raw_read_unlock(rw) asm volatile("lock ; incl %0"
:"=m" ((rw)->lock) : : "memory")
#define _raw_write_unlock(rw) asm volatile("lock ; addl $"
RW_LOCK_BIAS_STR ",%0":"=m" ((rw)->lock) : :
"memory")
+static inline int _raw_read_trylock(rwlock_t *lock)
+{
+ atomic_t *count = (atomic_t *)lock;
+ atomic_dec(count);
+ if (atomic_read(count) >= 0)
+ return 1;
+ atomic_inc(count);
+ return 0;
+}
+
static inline int _raw_write_trylock(rwlock_t *lock)
{
atomic_t *count = (atomic_t *)lock;
-------------------------------------------------------
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