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powerpc: Linux cannot run with 0 cores 

If we configure with CONFIG_SMP=n or set NR_CPUS less than the number of
SMT threads we will set the max cores property to 0 in the
ibm,client-architecture-support structure. On new versions of firmware that
understand this property it obliges and terminates our partition.

Use DIV_ROUND_UP so we handle not only the CONFIG_SMP=n case but also the
case where NR_CPUS isn't a multiple of the number of SMT threads.

Signed-off-by: Anton Blanchard <anton@samba.org>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Anton Blanchard 2010-06-17 14:33:06 +00:00 committed by Benjamin Herrenschmidt
parent 3880ecb05b
commit 33ad5e4b6c
1 changed files with 1 additions and 1 deletions
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2
arch/powerpc/kernel/prom_init.c
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@ -872,7 +872,7 @@ static void __init prom_send_capabilities(void)
"ibm_architecture_vec structure inconsistent: 0x%x !\n",
*cores);
} else {
*cores = NR_CPUS / prom_count_smt_threads();
*cores = DIV_ROUND_UP(NR_CPUS, prom_count_smt_threads());
prom_printf("Max number of cores passed to firmware: 0x%x\n",
(unsigned long)*cores);
}