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mm/init: cpu_hotplug_init() must be initialized before SLAB

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SLAB uses get/put_online_cpus() which use a mutex which is itself only
initialized when cpu_hotplug_init() is called.  Currently we hang suring
boot in SLAB due to doing that too late.

Reported by James Bottomley and Sachin Sant (and possibly others).
Debugged by Benjamin Herrenschmidt.

This just removes the dynamic initialization of the data structures, and
replaces it with a static one, avoiding this dependency entirely, and
removing one unnecessary special initcall.

Tested-by: Sachin Sant <[email protected]>
Tested-by: James Bottomley <[email protected]>
Tested-by: Benjamin Herrenschmidt <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Linus Torvalds 2009-06-22 21:18:12 -07:00
commit 31950eb66f
3 changed files with 5 additions and 14 deletions
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1
init/main.c
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@ -678,7 +678,6 @@ asmlinkage void __init start_kernel(void)
#endif
page_cgroup_init();
enable_debug_pagealloc();
cpu_hotplug_init();
kmemtrace_init();
kmemleak_init();
debug_objects_mem_init();