linux/arch
John David Anglin 50861f5a02 parisc: Fix cache routines to ignore vma's with an invalid pfn
The parisc architecture does not have a pte special bit. As a result,
special mappings are handled with the VM_PFNMAP and VM_MIXEDMAP flags.
VM_MIXEDMAP mappings may or may not have a "struct page" backing. When
pfn_valid() is false, there is no "struct page" backing. Otherwise, they
are treated as normal pages.

The FireGL driver uses the VM_MIXEDMAP without a backing "struct page".
This treatment caused a panic due to a TLB data miss in
update_mmu_cache. This appeared to be in the code generated for
page_address(). We were in fact using a very circular bit of code to
determine the physical address of the PFN in various cache routines.
This wasn't valid when there was no "struct page" backing.  The needed
address can in fact be determined simply from the PFN itself without
using the "struct page".

The attached patch updates update_mmu_cache(), flush_cache_mm(),
flush_cache_range() and flush_cache_page() to check pfn_valid() and to
directly compute the PFN physical and virtual addresses.

Signed-off-by: John David Anglin <dave.anglin@bell.net>
Cc: <stable@vger.kernel.org> # 3.10
Signed-off-by: Helge Deller <deller@gmx.de>
2013-07-31 23:41:47 +02:00
..
alpha alpha: Use handle_percpu_irq for the timer interrupt 2013-07-19 13:54:26 -07:00
arc ARC: SMP build breakage 2013-07-26 15:34:22 -07:00
arm Xen ARM fix for 3.11 2013-07-31 11:34:56 -07:00
arm64 arm64: Change kernel stack size to 16K 2013-07-26 13:37:29 +01:00
avr32 net: rename busy poll socket op and globals 2013-07-10 17:08:27 -07:00
blackfin Merge branch 'cpuinit_phase2' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux 2013-07-18 10:50:26 -07:00
c6x Merge branch 'akpm' (updates from Andrew Morton) 2013-07-03 17:12:13 -07:00
cris cris: delete __cpuinit usage from all cris files 2013-07-14 19:36:54 -04:00
frv frv: delete __cpuinit usage from all frv files 2013-07-14 19:36:55 -04:00
h8300 net: rename busy poll socket op and globals 2013-07-10 17:08:27 -07:00
hexagon hexagon: delete __cpuinit usage from all hexagon files 2013-07-14 19:36:55 -04:00
ia64 net: rename busy poll socket op and globals 2013-07-10 17:08:27 -07:00
m32r m32r: delete __cpuinit usage from all m32r files 2013-07-14 19:36:55 -04:00
m68k Merge branch 'akpm' (updates from Andrew Morton) 2013-07-03 17:12:13 -07:00
metag metag: delete __cpuinit usage from all metag files 2013-07-14 19:36:54 -04:00
microblaze Merge branch 'next' of git://git.monstr.eu/linux-2.6-microblaze 2013-07-10 10:16:07 -07:00
mips MIPS: BMIPS: fix slave CPU booting when physical CPU is not 0 2013-07-30 18:54:29 +02:00
mn10300 net: rename busy poll socket op and globals 2013-07-10 17:08:27 -07:00
openrisc openrisc: delete __cpuinit usage from all openrisc files 2013-07-14 19:36:55 -04:00
parisc parisc: Fix cache routines to ignore vma's with an invalid pfn 2013-07-31 23:41:47 +02:00
powerpc powerpc/perf: BHRB filter configuration should follow the task 2013-07-24 14:42:34 +10:00
s390 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2013-07-19 15:08:12 -07:00
score score: delete __cpuinit usage from all score files 2013-07-14 19:36:56 -04:00
sh sh: delete __cpuinit usage from all sh files 2013-07-14 19:36:53 -04:00
sparc sparc: delete __cpuinit/__CPUINIT usage from all users 2013-07-14 19:36:52 -04:00
tile tile: delete __cpuinit usage from all tile files 2013-07-14 19:36:54 -04:00
um um: siginfo cleanup 2013-07-19 11:31:36 +02:00
unicore32 reboot: move arch/x86 reboot= handling to generic kernel 2013-07-09 10:33:29 -07:00
x86 Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2013-07-24 11:05:18 -07:00
xtensa xtensa: delete __cpuinit usage from all xtensa files 2013-07-14 19:36:56 -04:00
.gitignore
Kconfig mm: soft-dirty bits for user memory changes tracking 2013-07-03 16:07:26 -07:00