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Paul Mackerras 65ba6cdc83 [POWERPC] Clear sub-page HPTE present bits when demoting page size ... When we demote a slice from 64k to 4k, and we are about to insert an HPTE for a 4k subpage and we notice that there is an existing 64k HPTE, we first invalidate that HPTE before inserting the new 4k subpage HPTE. Since the bits that encode which hash bucket the old HPTE was in overlap with the bits that encode which of the 16 subpages have HPTEs, we need to clear out the subpage HPTE-present bits before starting to insert HPTEs for the 4k subpages. If we don't do that, we can erroneously think that a subpage already has an HPTE when it doesn't. That in itself wouldn't be such a problem except that when we go to update the HPTE that we think is present on machines with a hypervisor, the hypervisor can tell us that the HPTE we think is there is actually there even though it isn't, which can lead to a process getting stuck in a loop, continually faulting. The reason for the confusion is that the AVPN (abbreviated virtual page number) we are looking for in the HPTE for a 4k subpage can actually match the AVPN in a stale HPTE for another 64k page. For example, the HPTE for the 4k subpage at 0x84000f000 will be in the same hash bucket and have the same AVPN as the HPTE for the 64k page at 0x8400f0000. This fixes the code to clear out the subpage HPTE-present bits. Signed-off-by: Paul Mackerras <paulus@samba.org>		17 years ago
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alpha	…
arm	[ARM] 5077/1: spi: fix list scan success verification in PXA ssp driver	17 years ago
avr32	…
blackfin	Blackfin arch: protect only the SPI bus controller with CONFIG_SPI_BFIN	17 years ago
cris	…
frv	Fix various old email addresses for dwmw2	17 years ago
h8300	…
ia64	Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6	17 years ago
m32r	…
m68k	m68k: enable CONFIG_COMPAT_BRK by default	17 years ago
m68knommu	m68knommu: init coldfire timer TRR with n - 1, not n	17 years ago
mips	[MIPS] Au1200: MMC resource size off by one	17 years ago
mn10300	MN10300: Kill linux/a.out.h inclusions	17 years ago
parisc	parisc: fix off by one in setup_sigcontext32	17 years ago
powerpc	[POWERPC] Clear sub-page HPTE present bits when demoting page size	17 years ago
ppc	…
s390	Merge branch 'kvm-updates-2.6.26' of git://git.kernel.org/pub/scm/linux/kernel/git/avi/kvm	17 years ago
sh	sh: Add -mno-fdpic to default flags.	17 years ago
sparc	sparc: switch /proc/led to seq_file	17 years ago
sparc64	…
um	uml: work around broken host PTRACE_SYSEMU	17 years ago
v850	…
x86	x86-64: Fix "bytes left to copy" return value for copy_from_user()	17 years ago
xtensa	…
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Kconfig	…