[patch] bug in cpuid & msr on nosmp machine

[matthieu castet]

hi,

on monocpu machine (and maybe even on smp machine), when you try to 
acces to a cpu that don't exist (/dev/cpu/1/cpuid), cpuid (msr) call 
cpu_online, but on nosmp machine if the cpu!=0 this procude a BUG();
So I add a check that verify if the cpu can exist before calling cpu_online.

Matthieu CASTET
--- linux/arch/i386/kernel/cpuid.c	2004-05-18 20:47:05.000000000 +0200
+++ linux-2.6.5/arch/i386/kernel/cpuid.c	2004-04-04 05:36:12.000000000 +0200
@@ -135,7 +135,7 @@
   int cpu = iminor(file->f_dentry->d_inode);
   struct cpuinfo_x86 *c = &(cpu_data)[cpu];
 
-  if (cpu >= num_possible_cpus() || !cpu_online(cpu))
+  if (!cpu_online(cpu))
     return -ENXIO;		/* No such CPU */
   if ( c->cpuid_level < 0 )
     return -EIO;		/* CPUID not supported */
--- linux/arch/i386/kernel/msr.c	2004-05-19 18:25:09.000000000 +0200
+++ linux-2.6.5/arch/i386/kernel/msr.c	2004-04-04 05:36:57.000000000 +0200
@@ -241,7 +241,7 @@
   int cpu = iminor(file->f_dentry->d_inode);
   struct cpuinfo_x86 *c = &(cpu_data)[cpu];
   
-  if (cpu >= num_possible_cpus() || !cpu_online(cpu))
+  if (!cpu_online(cpu))
     return -ENXIO;		/* No such CPU */
   if ( !cpu_has(c, X86_FEATURE_MSR) )
     return -EIO;		/* MSR not supported */