aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-realview/platsmp.c
diff options
context:
space:
mode:
authorRussell King <rmk@dyn-67.arm.linux.org.uk>2006-02-16 11:08:09 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2006-02-16 11:08:09 +0000
commit7bbb79403163e047c6e333ff169db34e3c969e65 (patch)
tree423e32c02baa1d61085c67865d11a448db34857a /arch/arm/mach-realview/platsmp.c
parentba09cf2bcf9b74d852dcb5ea957ac6af2bc0e057 (diff)
[ARM] Fix SMP initialisation oops
A change to the SMP initialisation caused the following oops: CPU1: Booted secondary processor CPU1: D VIPT write-back cache CPU1: I cache: 32768 bytes, associativity 4, 32 byte lines, 256 sets CPU1: D cache: 32768 bytes, associativity 4, 32 byte lines, 256 sets <7>Calibrating delay loop... 83.14 BogoMIPS (lpj=415744) <1>Unable to handle kernel NULL pointer dereference at virtual address 0000001c ... PC is at enqueue_task+0x1c/0x64 LR is at activate_task+0xcc/0xe4 SMP initialisation now requires cpu_possible_map to be initialised in setup_arch(). Move this from smp_prepare_cpus() to smp_init_cpus() and call it from our setup_arch() if CONFIG_SMP is enabled. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mach-realview/platsmp.c')
-rw-r--r--arch/arm/mach-realview/platsmp.c21
1 files changed, 15 insertions, 6 deletions
diff --git a/arch/arm/mach-realview/platsmp.c b/arch/arm/mach-realview/platsmp.c
index a8fbd76d8be..b8484e15dac 100644
--- a/arch/arm/mach-realview/platsmp.c
+++ b/arch/arm/mach-realview/platsmp.c
@@ -143,6 +143,18 @@ static void __init poke_milo(void)
mb();
}
+/*
+ * Initialise the CPU possible map early - this describes the CPUs
+ * which may be present or become present in the system.
+ */
+void __init smp_init_cpus(void)
+{
+ unsigned int i, ncores = get_core_count();
+
+ for (i = 0; i < ncores; i++)
+ cpu_set(i, cpu_possible_map);
+}
+
void __init smp_prepare_cpus(unsigned int max_cpus)
{
unsigned int ncores = get_core_count();
@@ -179,14 +191,11 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
local_timer_setup(cpu);
/*
- * Initialise the possible/present maps.
- * cpu_possible_map describes the set of CPUs which may be present
- * cpu_present_map describes the set of CPUs populated
+ * Initialise the present map, which describes the set of CPUs
+ * actually populated at the present time.
*/
- for (i = 0; i < max_cpus; i++) {
- cpu_set(i, cpu_possible_map);
+ for (i = 0; i < max_cpus; i++)
cpu_set(i, cpu_present_map);
- }
/*
* Do we need any more CPUs? If so, then let them know where