On Mon, Sep 02, 2013 at 04:44:52PM +0100, Max Filippov wrote:
> On Mon, Sep 2, 2013 at 7:31 PM, Catalin Marinas <catalin.mari...@arm.com>
> wrote:
> > On 31 August 2013 14:35, Martin MOKREJŠ <mmokr...@gmail.com> wrote:
> >> never realized that my CPUs are gone if I compile into kernel kmemleak.
> >> Is that really the aim?
> >>
> >> CONFIG_HAVE_DEBUG_KMEMLEAK=y
> >> CONFIG_DEBUG_KMEMLEAK=y
> >> CONFIG_DEBUG_KMEMLEAK_EARLY_LOG_SIZE=400
> >> # CONFIG_DEBUG_KMEMLEAK_TEST is not set
> >> # CONFIG_DEBUG_KMEMLEAK_DEFAULT_OFF is not set
> >>
> >> 1. Why isn't there /sys/devices/system/cpu/cpu0/online file?
> >> Does not matter if it contains 0 or 1. It just should exist.
> >
> > I can't really see how kmemleak would do this, maybe other config
> > options that get set/cleared in the process of selecting kmemleak. Can
>
> Seems to be kmemcheck: from arch/x86/mm/kmemcheck/kmemcheck.c:
>
> int __init kmemcheck_init(void)
> {
> #ifdef CONFIG_SMP
> /*
> * Limit SMP to use a single CPU. We rely on the fact that this code
> * runs before SMP is set up.
> */
> if (setup_max_cpus > 1) {
> printk(KERN_INFO
> "kmemcheck: Limiting number of CPUs to 1.\n");
> setup_max_cpus = 1;
> }
> #endif
Ah, ok, not my problem then ;)
--
Catalin
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