[PATCH] ia64: mca rendezvous fix

We are not setting the 'always rendezvous for mca' flag.  kdb needs it
set to get decent mca debugging on all cpus but I do not want kdb to
change sal behaviour.  Since we do not recover from mca without a
debugger, I see no reason why this flag should not be on for all
kernels.

The rendezvous timeout was set to 100 * HZ, but SAL expects the timeout
to be in milliseconds, HZ may not be 1 millisecond.  The patch makes
the timeout an explicit 20 seconds, semi-arbitrary value.

arch/ia64/kernel/mca.c

@@ -467,7 +467,7 @@ ia64_mca_init(void)
 					 SAL_MC_PARAM_MECHANISM_INT,
 					 IA64_MCA_RENDEZ_VECTOR,
 					 IA64_MCA_RENDEZ_TIMEOUT,
-					 0)))
+					 SAL_MC_PARAM_RZ_ALWAYS)))
 	{
 		printk(KERN_ERR "ia64_mca_init: Failed to register rendezvous interrupt "
 		       "with SAL.  rc = %ld\n", rc);

include/asm-ia64/mca.h

@@ -24,7 +24,7 @@ enum {
 	IA64_MCA_FAILURE	=	1
 };
 
-#define IA64_MCA_RENDEZ_TIMEOUT		(100 * HZ)	/* 1000 milliseconds */
+#define IA64_MCA_RENDEZ_TIMEOUT		(20 * 1000)	/* value in milliseconds - 20 seconds */
 
 #define IA64_CMC_INT_DISABLE		0
 #define IA64_CMC_INT_ENABLE		1