Messages in this thread | | | Date | Wed, 31 Mar 2010 18:26:54 -0400 | From | Andrew Morton <> | Subject | Re: start_kernel(): bug: interrupts were enabled early |
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On Thu, 01 Apr 2010 12:17:11 +1100 Benjamin Herrenschmidt <benh@kernel.crashing.org> wrote:
> On Wed, 2010-03-31 at 15:49 -0700, Andrew Morton wrote: > > > > But these things are all utterly gross. The bottom line is that > > radix_tree_init() is manifestly unsuited to being called with local > > interrupts disabled. 773e3eb7b81e5ba13b5155dfb3bb75b8ce37f8f9 was > > just a wrong patch. > > Except that powerpc (and now it seems x86) both want to use radix trees > for interrupt handling... At least on powerpc, we trick and use a linear > search until the radix trees are initialized, which we do later during > boot, but that somewhat sucks. > > I believe sherry picking things like not calling radix_tree_init() is > going to fix one case today, until we have another one, and another one, > and etc... > > I suspect we're better off fixing the root of the problem in down/up. >
Not by adding overhead to every single down_read()/down_write() just to fix a once-off startup problem - that's taking laziness way too far.
We'd be better off hacking a kmem_cache_create() special case to avoid taking the rwsem. Add SLAB_I_SUCK to `flags' perhaps.
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