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| author | Ingo Molnar <mingo@elte.hu> | 2007-10-19 20:35:02 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2007-10-19 20:35:02 +0200 |
| commit | 54ffaa45c5f572ff6c344ca583137d0edf2d78cc (patch) | |
| tree | 389a89b03cf4c8197e3ed8ac7af78950251ce235 /arch/x86/kernel/head_32.S | |
| parent | x86: use relative symlink for bzImage (diff) | |
| download | linux-54ffaa45c5f572ff6c344ca583137d0edf2d78cc.tar.xz linux-54ffaa45c5f572ff6c344ca583137d0edf2d78cc.zip | |
x86: fix CONFIG_NUMA and nosmp | maxcpus=0/1 crash
x86 NUMA kernels crash in the scheduler setup code if "nosmp" or
"maxcpus=0" is passed on the boot command line:
| Brought up 1 CPUs
| BUG: unable to handle kernel NULL pointer dereference at virtual address 00000000
| printing eip: c011f0b5 *pde = 00000000
| Oops: 0000 [#1] SMP
|
| Pid: 1, comm: swapper Not tainted (2.6.23 #67)
| EIP: 0060:[<c011f0b5>] EFLAGS: 00010246 CPU: 0
| EIP is at sd_degenerate+0x35/0x40
the reason is sloppy spaghetti code in smpboot_32.c that resulted in a
missing map_cpu_to_logical_apicid() call - which also had the side-effect
of setting up the cpu_2_node[] entry for the lone CPU. That resulted in
node_to_cpumask(0) resulting in 00000000 - confusing the sched-domains
setup code.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/kernel/head_32.S')
0 files changed, 0 insertions, 0 deletions