On Wed, Mar 07, 2007 at 11:52:32AM +0100, Michael Ellerman wrote: > There's already maxcpus in init/main.c, that would probably be better, > though still ugly. > Based on Mike's suggestions, I modified the patch. The attached patch refers max_cpus variable to check whether the kernel is booted with maxcpus=1 parameter and if maxcpus=1 is specified the patch assigns only the current boot cpu to be the default distribution server. Patch is generated over 2.6.20 kernel, cleanly applies to 2.6.21-rc5 kernel. Any suggestion, comment? Signed-off-by: Mohan Kumar M <mohan@xxxxxxxxxx> --- arch/powerpc/platforms/pseries/xics.c | 9 +++++++++ init/main.c | 2 +- 2 files changed, 10 insertions(+), 1 deletion(-) Index: linux-2.6.20/arch/powerpc/platforms/pseries/xics.c =================================================================== --- linux-2.6.20.orig/arch/powerpc/platforms/pseries/xics.c +++ linux-2.6.20/arch/powerpc/platforms/pseries/xics.c @@ -679,6 +679,8 @@ static struct device_node *cpuid_to_of_n return NULL; } +extern unsigned int max_cpus; + void __init xics_init_IRQ(void) { int i, j; @@ -734,6 +736,13 @@ void __init xics_init_IRQ(void) skip_gserver_check: of_node_put(np); + /* Kdump with maxcpus parameter in PPC970xx creates interrupt + * distribution problems. So assign current boot cpu id to + * interrupt distribution server + */ + if (max_cpus == 1) + default_distrib_server = default_server; + if (firmware_has_feature(FW_FEATURE_LPAR)) ppc_md.get_irq = xics_get_irq_lpar; else Index: linux-2.6.20/init/main.c =================================================================== --- linux-2.6.20.orig/init/main.c +++ linux-2.6.20/init/main.c @@ -128,7 +128,7 @@ static char *execute_command; static char *ramdisk_execute_command; /* Setup configured maximum number of CPUs to activate */ -static unsigned int max_cpus = NR_CPUS; +unsigned int max_cpus = NR_CPUS; /* * If set, this is an indication to the drivers that reset the underlying _______________________________________________ fastboot mailing list fastboot@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/fastboot