Yu, Fenghua wrote: >> Yu, Fenghua wrote: >> >>> After cloning from >>> git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu.git, kernel >>> built with CONFIG_DISCONTIGMEM=y boots ok. >>> >>> After pulling from review-ia64, kernel built with >>> CONFIG_DISCONTIGMEM=y can not boot on ia64. After loading kernel and >>> initrd, system hangs and doesn't show anything on serial port. >> Heh, I didn't really expect it to work that easily either. The code >> builds but is completely untested (I can't test them). Can you try to >> track it down? Serial console should be up and running at that point, >> no? >> >> Thanks. > > IA64 kernel boots hit this in mm/percpu.c > BUG_ON(ai->unit_size < size_sum); > ai->unit_size is PERCPU_PAGE_SIZE which is 64K on IA64. size_sum is > relatively smaller than 64K. > > Will you define PERCPU_DYNAMIC_RESERVE and PERCPU_MODULE_RESERVE as > PAGE_SIZE or the bigger one between the current definition and > PAGE_SIZE? Hmmm... * Is ai->reserved_size necessary for ia64? This is necessary if there's linking range restriction when loading modules. ai->reserved_size guarantees that all static module percpu variables are allocated in the first chunk which will be in the linear address range and very close to __per_cpu_start. If ai->reserved_size is not set, these areas are likely to end up high in the vmalloc area. For example, x86_64 assumes 32bit relocations should be enough to link module symbols and thus needs to set reserved_size but x86_32 can link to the whole 32bit space and thus can leave reserved_size at zero. * After determining the above, we can set ai->dyn_size to be ai->dyn_size = min(ai->unit_size - ai->static_size - ai->reserved_size, PERCPU_DYNAMIC_RESERVE); Would the above work? > Even with the above PAGE_SIZE changes, the kernel still reports > warning from 952: WARN_ON(chunk->immutable) and then panic. Hah... strange. Can you please attach full boot log? This is dicontig configuration, right? Thanks. -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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