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[PATCH]: load_mmu for SMP systems

To: linux-mips@linux-mips.org
Subject: [PATCH]: load_mmu for SMP systems
From: "Kip Walker" <kwalker@broadcom.com>
Date: Fri, 25 Apr 2003 11:24:20 -0700
Cc: "Ralf Baechle" <ralf@linux-mips.org>
Organization: Broadcom Corp. BPBU
Original-recipient: rfc822;linux-mips@linux-mips.org
Sender: linux-mips-bounce@linux-mips.org
In SMP systems, each CPU needs to set up "current_cpu_data.tlbsize". 
Some CPUs do this initialization in cpu_probe, which is called both by
init_arch and start_secondary.  However, some CPUs do this in their TLB
setup code, which is called via load_mmu.  The SMP boot code doesn't
currently call load_mmu() for the secondary CPUs.  Here's a simple fix
for the 2.4 tree.

TLB flush routines that have loops running up to tlbsize will lose if
it's not set properly on all CPUs!

Kip
Index: arch/mips/kernel/smp.c
===================================================================
RCS file: /home/cvs/linux/arch/mips/kernel/smp.c,v
retrieving revision 1.10.2.24
diff -u -r1.10.2.24 smp.c
--- arch/mips/kernel/smp.c      23 Apr 2003 20:10:49 -0000      1.10.2.24
+++ arch/mips/kernel/smp.c      25 Apr 2003 18:19:55 -0000
@@ -99,6 +99,7 @@
        unsigned int cpu = smp_processor_id();
 
        cpu_probe();
+       load_mmu();
        prom_init_secondary();
        per_cpu_trap_init();
 
Index: arch/mips64/kernel/smp.c
===================================================================
RCS file: /home/cvs/linux/arch/mips64/kernel/smp.c,v
retrieving revision 1.26.2.22
diff -u -r1.26.2.22 smp.c
--- arch/mips64/kernel/smp.c    23 Apr 2003 20:10:49 -0000      1.26.2.22
+++ arch/mips64/kernel/smp.c    25 Apr 2003 18:19:55 -0000
@@ -103,6 +103,7 @@
        unsigned int cpu = smp_processor_id();
 
        cpu_probe();
+       load_mmu();
        prom_init_secondary();
        per_cpu_trap_init();
 
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