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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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40x_mmu.c	[POWERPC] Remove and replace uses of PPC_MEMSTART with memstart_addr	17 years ago
44x_mmu.c	[POWERPC] Introduce lowmem_end_addr to distinguish from total_lowmem	17 years ago
Makefile	[LIB]: Make PowerPC LMB code generic so sparc64 can use it too.	17 years ago
fault.c	[POWERPC] Make setjmp/longjmp code usable outside of xmon	17 years ago
fsl_booke_mmu.c	[POWERPC] 85xx: Add support for relocatable kernel (and booting at non-zero)	17 years ago
hash_low_32.S	[POWERPC] powerpc/mm/hash_low_32.S: Remove CVS keyword	17 years ago
hash_low_64.S	[POWERPC] Clear sub-page HPTE present bits when demoting page size	17 years ago
hash_native_64.c	…
hash_utils_64.c	[POWERPC] vmemmap fixes to use smaller pages	17 years ago
hugetlbpage.c	[POWERPC] Add hugepagesz boot-time parameter	17 years ago
init_32.c	[POWERPC] Port fixmap from x86 and use for kmap_atomic	17 years ago
init_64.c	[POWERPC] vmemmap fixes to use smaller pages	17 years ago
mem.c	[POWERPC] Make walk_memory_resource available with MEMORY_HOTPLUG=n	17 years ago
mmap.c	…
mmu_context_32.c	…
mmu_context_64.c	…
mmu_decl.h	[POWERPC] Rename __initial_memory_limit to __initial_memory_limit_addr	17 years ago
numa.c	[POWERPC] Add include of linux/of.h to numa.c	17 years ago
pgtable_32.c	[POWERPC] Fix __set_fixmap() for STRICT_MM_TYPECHECKS	17 years ago
pgtable_64.c	…
ppc_mmu_32.c	[POWERPC] Rename __initial_memory_limit to __initial_memory_limit_addr	17 years ago
slb.c	[POWERPC] vmemmap fixes to use smaller pages	17 years ago
slb_low.S	[POWERPC] vmemmap fixes to use smaller pages	17 years ago
slice.c	…
stab.c	[LIB]: Make PowerPC LMB code generic so sparc64 can use it too.	17 years ago
subpage-prot.c	[POWERPC] Provide a way to protect 4k subpages when using 64k pages	17 years ago
tlb_32.c	…
tlb_64.c	[POWERPC] Fix CONFIG_SMP=n build error on ppc64	18 years ago