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
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boot	x86: relocs ELF handling - use SELFMAG instead of numeric constant	2008-05-04 20:04:45 +02:00
configs	…
crypto	…
ia32	…
kernel	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86-fixes	2008-05-04 17:11:43 -07:00
kvm	KVM: MMU: Allow more than PAGES_PER_HPAGE write protections per large page	2008-05-04 14:44:49 +03:00
lguest	…
lib	…
mach-default	…
mach-es7000	…
mach-generic	…
mach-rdc321x	…
mach-visws	…
mach-voyager	…
math-emu	…
mm	x86: fix PAE pmd_bad bootup warning	2008-05-06 13:08:58 -07:00
oprofile	…
pci	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6	2008-05-05 12:39:10 -07:00
power	…
vdso	x86: vdso ELF handling - use SELFMAG instead of numeric constant	2008-05-04 20:04:45 +02:00
video	x86: video/fbdev.c: add MODULE_LICENSE	2008-05-04 20:04:46 +02:00
xen	…
Kconfig	sched, x86: add HAVE_UNSTABLE_SCHED_CLOCK	2008-05-05 23:56:18 +02:00
Kconfig.cpu	…
Kconfig.debug	x86: Mark OPTIMIZE_INLINING broken	2008-04-30 20:07:22 -07:00
Makefile	…
Makefile_32.cpu	…