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| author | Russell Currey <ruscur@russell.cc> | 2019-12-24 17:41:25 +1100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-01-16 14:59:36 +1000 |
| commit | 970d54f99ceac5bbf27929cb5ebfe18338ba1543 (patch) | |
| tree | d4a61eb30293e482c122096f300c1072bf684227 /tools/perf/scripts/python/netdev-times.py | |
| parent | powerpc/pseries: Advance pfn if section is not present in lmb_is_removable() (diff) | |
| download | linux-970d54f99ceac5bbf27929cb5ebfe18338ba1543.tar.gz linux-970d54f99ceac5bbf27929cb5ebfe18338ba1543.zip | |
powerpc/book3s64/hash: Disable 16M linear mapping size if not aligned
With STRICT_KERNEL_RWX on in a relocatable kernel under the hash MMU,
if the position the kernel is loaded at is not 16M aligned things go
horribly wrong. Specifically hash__mark_initmem_nx() will call
hash__change_memory_range() which then aligns down the start address,
and due to the text not being 16M aligned causes some of the kernel
text to be marked non-executable.
We can avoid this when selecting the linear mapping size, so do so and
print a warning. I tested this for various alignments and as long as
the position is 64K aligned it's fine (the base requirement for
powerpc).
Signed-off-by: Russell Currey <ruscur@russell.cc>
[mpe: Add details of the failure mode]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20191224064126.183670-1-ruscur@russell.cc
Diffstat (limited to 'tools/perf/scripts/python/netdev-times.py')
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