Messages in this thread | | | Subject | BUG: cpufreq notification broken | From | Thomas Gleixner <> | Date | Thu, 16 Nov 2006 21:00:50 +0100 |
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[PATCH] cpufreq: make the transition_notifier chain use SRCU (b4dfdbb3c707474a2254c5b4d7e62be31a4b7da9)
breaks cpu frequency notification users, which register the callback on core_init level. Interestingly enough the registration survives the uninitialized head, but the registered user is lost by:
static int __init init_cpufreq_transition_notifier_list(void) { srcu_init_notifier_head(&cpufreq_transition_notifier_list); return 0; } core_initcall(init_cpufreq_transition_notifier_list);
This affects i386, x86_64 and sparc64 AFAICT, which call register_notifier early in the arch code.
> The head of the notifier chain needs to be initialized before use; > this is done by an __init routine at core_initcall time. If this turns > out not to be a good choice, it can easily be changed.
Hmm, there are no static initializers for srcu and the only way to fix this up is to move the arch calls to postcore_init.
tglx
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