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| author |   Ben Hutchings <ben@decadent.org.uk> | 2009-09-10 02:53:50 +0100 |
|---|---|---|
| committer |   H. Peter Anvin <hpa@zytor.com> | 2009-09-10 16:50:19 -0700 |
| commit | 5367b6887e7d8c870a5da7d9b8c6e9c207684e43 (patch) | |
| tree | eab362078a7964850b00f8d781aa9c9f5ff01df7 /mm/page_alloc.c | |
| parent | x86, msr: change msr-reg.o to obj-y, and export its symbols (diff) | |
| download | linux-dev-5367b6887e7d8c870a5da7d9b8c6e9c207684e43.tar.xz linux-dev-5367b6887e7d8c870a5da7d9b8c6e9c207684e43.zip | |
x86: Fix code patching for paravirt-alternatives on 486
As reported in <http://bugs.debian.org/511703> and
<http://bugs.debian.org/515982>, kernels with paravirt-alternatives
enabled crash in text_poke_early() on at least some 486-class
processors.
The problem is that text_poke_early() itself uses inline functions
affected by paravirt-alternatives and so will modify instructions that
have already been prefetched. Pentium and later processors will
invalidate the prefetched instructions in this case, but 486-class
processors do not.
Change sync_core() to limit prefetching on 486-class (and 386-class)
processors, and move the call to sync_core() above the call to the
modifiable local_irq_restore().
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
LKML-Reference: <1252547631.3423.134.camel@localhost>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'mm/page_alloc.c')
0 files changed, 0 insertions, 0 deletions