diff options
| author | Zwane Mwaikambo | 2005-09-04 00:56:51 +0200 |
|---|---|---|
| committer | Linus Torvalds | 2005-09-05 09:06:13 +0200 |
| commit | 4ad8d38342430f8b52f7a8458dce90caf8c8ca64 (patch) | |
| tree | 090c471fdb44d8fe88c52e95be0e8e43e31fcd5a /arch/i386/kernel/smpboot.c | |
| parent | [PATCH] i386: encapsulate copying of pgd entries (diff) | |
| download | kernel-qcow2-linux-4ad8d38342430f8b52f7a8458dce90caf8c8ca64.tar.gz kernel-qcow2-linux-4ad8d38342430f8b52f7a8458dce90caf8c8ca64.tar.xz kernel-qcow2-linux-4ad8d38342430f8b52f7a8458dce90caf8c8ca64.zip | |
[PATCH] i386 boottime for_each_cpu broken
for_each_cpu walks through all processors in cpu_possible_map, which is
defined as cpu_callout_map on i386 and isn't initialised until all
processors have been booted. This breaks things which do for_each_cpu
iterations early during boot. So, define cpu_possible_map as a bitmap with
NR_CPUS bits populated. This was triggered by a patch i'm working on which
does alloc_percpu before bringing up secondary processors.
From: Alexander Nyberg <alexn@telia.com>
i386-boottime-for_each_cpu-broken.patch
i386-boottime-for_each_cpu-broken-fix.patch
The SMP version of __alloc_percpu checks the cpu_possible_map before
allocating memory for a certain cpu. With the above patches the BSP cpuid
is never set in cpu_possible_map which breaks CONFIG_SMP on uniprocessor
machines (as soon as someone tries to dereference something allocated via
__alloc_percpu, which in fact is never allocated since the cpu is not set
in cpu_possible_map).
Signed-off-by: Zwane Mwaikambo <zwane@arm.linux.org.uk>
Signed-off-by: Alexander Nyberg <alexn@telia.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/i386/kernel/smpboot.c')
| -rw-r--r-- | arch/i386/kernel/smpboot.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/i386/kernel/smpboot.c b/arch/i386/kernel/smpboot.c index 8e950cdff1a0..5e4893d2b9f2 100644 --- a/arch/i386/kernel/smpboot.c +++ b/arch/i386/kernel/smpboot.c @@ -88,6 +88,8 @@ EXPORT_SYMBOL(cpu_online_map); cpumask_t cpu_callin_map; cpumask_t cpu_callout_map; EXPORT_SYMBOL(cpu_callout_map); +cpumask_t cpu_possible_map; +EXPORT_SYMBOL(cpu_possible_map); static cpumask_t smp_commenced_mask; /* TSC's upper 32 bits can't be written in eariler CPU (before prescott), there @@ -1265,6 +1267,7 @@ void __devinit smp_prepare_boot_cpu(void) cpu_set(smp_processor_id(), cpu_online_map); cpu_set(smp_processor_id(), cpu_callout_map); cpu_set(smp_processor_id(), cpu_present_map); + cpu_set(smp_processor_id(), cpu_possible_map); per_cpu(cpu_state, smp_processor_id()) = CPU_ONLINE; } |