parisc: Optimize flush_kernel_vmap_range and invalidate_kernel_vmap_range

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commit 316ec0624f upstream.

The previously submitted patch did not resolve the random segmentation
faults observed on the phantom buildd system.  There are still
unresolved problems with the Debian 4.8 and 4.9 kernels on C8000.

The attached patch removes the flush of the offset map pages and does a
whole data cache flush for large ranges.  No other arch flushes the
offset map in these routines as far as I can tell.

I have not observed any random segmentation faults on rp3440 in two
weeks of testing with 4.10.0 and 4.10.1.

Signed-off-by: John David Anglin <dave.anglin@bell.net>
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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John David Anglin 2017-03-11 18:03:34 -05:00 • committed by Greg Kroah-Hartman

parent 66e70bdca5

commit a690a42ae7

2 changed files with 24 additions and 21 deletions

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23

arch/parisc/include/asm/cacheflush.h

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22

arch/parisc/kernel/cache.c

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