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percpu: hack to let the CRIS architecture to boot until they clean up

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Commit 438a506180 ("percpu: don't forget to free the temporary struct
pcpu_alloc_info") uncovered a problem on the CRIS architecture where
the bootmem allocator is initialized with virtual addresses. Given it
has:

    #define __va(x) ((void *)((unsigned long)(x) | 0x80000000))

then things just work out because the end result is the same whether you
give this a physical or a virtual address.

Untill you call memblock_free_early(__pa(address)) that is, because
values from __pa() don't match with the virtual addresses stuffed in the
bootmem allocator anymore.

Avoid freeing the temporary pcpu_alloc_info memory on that architecture
until they fix things up to let the kernel boot like it did before.

Signed-off-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
Fixes: 438a506180 ("percpu: don't forget to free the temporary struct pcpu_alloc_info")
This commit is contained in:
Nicolas Pitre 2017-11-27 15:51:04 -05:00 committed by Tejun Heo
parent 4fbd8d194f
commit abee210500
1 changed files with 4 additions and 0 deletions
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mm/percpu.c
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@ -2719,7 +2719,11 @@ void __init setup_per_cpu_areas(void)
if (pcpu_setup_first_chunk(ai, fc) < 0)
panic("Failed to initialize percpu areas.");
#ifdef CONFIG_CRIS
#warning "the CRIS architecture has physical and virtual addresses confused"
#else
pcpu_free_alloc_info(ai);
#endif
}
#endif /* CONFIG_SMP */