Hugh Dickins aeed5fce37 x86: fix PAE pmd_bad bootup warning ... Fix warning from pmd_bad() at bootup on a HIGHMEM64G HIGHPTE x86_32. That came from 9fc34113f6 x86: debug pmd_bad(); but we understand now that the typecasting was wrong for PAE in the previous version: pagetable pages above 4GB looked bad and stopped Arjan from booting. And revert that cded932b75 x86: fix pmd_bad and pud_bad to support huge pages. It was the wrong way round: we shouldn't weaken every pmd_bad and pud_bad check to let huge pages slip through - in part they check that we _don't_ have a huge page where it's not expected. Put the x86 pmd_bad() and pud_bad() definitions back to what they have long been: they can be improved (x86_32 should use PTE_MASK, to stop PAE thinking junk in the upper word is good; and x86_64 should follow x86_32's stricter comparison, to stop thinking any subset of required bits is good); but that should be a later patch. Fix Hans' good observation that follow_page() will never find pmd_huge() because that would have already failed the pmd_bad test: test pmd_huge in between the pmd_none and pmd_bad tests. Tighten x86's pmd_huge() check? No, once it's a hugepage entry, it can get quite far from a good pmd: for example, PROT_NONE leaves it with only ACCESSED of the KERN_PGTABLE bits. However... though follow_page() contains this and another test for huge pages, so it's nice to keep it working on them, where does it actually get called on a huge page? get_user_pages() checks is_vm_hugetlb_page(vma) to to call alternative hugetlb processing, as does unmap_vmas() and others. Signed-off-by: Hugh Dickins <hugh@veritas.com> Earlier-version-tested-by: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Jeff Chua <jeff.chua.linux@gmail.com> Cc: Hans Rosenfeld <hans.rosenfeld@amd.com> Cc: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2008-05-06 13:08:58 -07:00
..
allocpercpu.c
backing-dev.c	mm: bdi: move statistics to debugfs	2008-04-30 08:29:50 -07:00
bootmem.c
bounce.c
dmapool.c
fadvise.c
filemap.c
filemap_xip.c
fremap.c
highmem.c
hugetlb.c
internal.h
Kconfig
maccess.c
madvise.c
Makefile
memcontrol.c	memcg: simple stats for memory resource controller	2008-05-01 08:04:02 -07:00
memory.c	x86: fix PAE pmd_bad bootup warning	2008-05-06 13:08:58 -07:00
memory_hotplug.c
mempolicy.c
mempool.c
migrate.c	mm: fix warning on memory offline	2008-04-30 08:29:55 -07:00
mincore.c
mlock.c
mmap.c
mmzone.c
mprotect.c
mremap.c
msync.c
nommu.c
oom_kill.c
page-writeback.c	mm: Add NR_WRITEBACK_TEMP counter	2008-04-30 08:29:50 -07:00
page_alloc.c	infrastructure to debug (dynamic) objects	2008-04-30 08:29:53 -07:00
page_io.c
page_isolation.c
pagewalk.c
pdflush.c
prio_tree.c
quicklist.c
readahead.c
rmap.c
shmem.c	mm: bdi: add separate writeback accounting capability	2008-04-30 08:29:50 -07:00
shmem_acl.c
slab.c	mm: remove remaining __FUNCTION__ occurrences	2008-04-30 08:29:53 -07:00
slob.c
slub.c	slub: #ifdef simplification	2008-05-02 00:27:13 +03:00
sparse-vmemmap.c
sparse.c	revert "memory hotplug: allocate usemap on the section with pgdat"	2008-04-30 08:29:55 -07:00
swap.c
swap_state.c	mm: bdi: add separate writeback accounting capability	2008-04-30 08:29:50 -07:00
swapfile.c
thrash.c
tiny-shmem.c
truncate.c
util.c
vmalloc.c	docbook: fix vmalloc missing parameter notation	2008-05-01 08:03:59 -07:00
vmscan.c	mm: remove remaining __FUNCTION__ occurrences	2008-04-30 08:29:53 -07:00
vmstat.c	mm: Add NR_WRITEBACK_TEMP counter	2008-04-30 08:29:50 -07:00