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Commit aa1d1a0a authored by David S. Miller's avatar David S. Miller
Browse files

[SPARC64]: smp_call_function() fixups... 



1) Take doc-book function comment from i386 implementation.
2) cacheline align call_lock, taken from powerpc
3) Need memory barrier after setting call_data
4) Remove timeout

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 731bbe43

arch/sparc64/kernel/smp.c

+15 −20
Original line number Diff line number Diff line
@@ -745,12 +745,21 @@ struct call_data_struct { 
	int wait;

};



static DEFINE_SPINLOCK(call_lock);

static __cacheline_aligned_in_smp DEFINE_SPINLOCK(call_lock);

static struct call_data_struct *call_data;



extern unsigned long xcall_call_function;



/*

/**

 * smp_call_function(): Run a function on all other CPUs.

 * @func: The function to run. This must be fast and non-blocking.

 * @info: An arbitrary pointer to pass to the function.

 * @nonatomic: currently unused.

 * @wait: If true, wait (atomically) until function has completed on other CPUs.

 *

 * Returns 0 on success, else a negative status code. Does not return until

 * remote CPUs are nearly ready to execute <<func>> or are or have executed.

 *

 * You must not call this function with disabled interrupts or from a

 * hardware interrupt handler or from a bottom half handler.

 */
@@ -759,7 +768,6 @@ static int smp_call_function_mask(void (*func)(void *info), void *info, 
{

	struct call_data_struct data;

	int cpus;

	long timeout;



	/* Can deadlock when called with interrupts disabled */

	WARN_ON(irqs_disabled());
@@ -777,31 +785,18 @@ static int smp_call_function_mask(void (*func)(void *info), void *info, 
		goto out_unlock;



	call_data = &data;

	mb();



	smp_cross_call_masked(&xcall_call_function, 0, 0, 0, mask);



	/* 

	 * Wait for other cpus to complete function or at

	 * least snap the call data.

	 */

	timeout = 1000000;

	while (atomic_read(&data.finished) != cpus) {

		if (--timeout <= 0)

			goto out_timeout;

		barrier();

		udelay(1);

	}

	/* Wait for response */

	while (atomic_read(&data.finished) != cpus)

		cpu_relax();



out_unlock:

	spin_unlock(&call_lock);



	return 0;



out_timeout:

	spin_unlock(&call_lock);

	printk("XCALL: Remote cpus not responding, ncpus=%d finished=%d\n",

	       cpus, atomic_read(&data.finished));

	return 0;

}



int smp_call_function(void (*func)(void *info), void *info,