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Zhang, Yanmin 8f860591ff [PATCH] Enable mprotect on huge pages 
2.6.16-rc3 uses hugetlb on-demand paging, but it doesn_t support hugetlb
mprotect.

From: David Gibson <david@gibson.dropbear.id.au>

  Remove a test from the mprotect() path which checks that the mprotect()ed
  range on a hugepage VMA is hugepage aligned (yes, really, the sense of
  is_aligned_hugepage_range() is the opposite of what you'd guess :-/).

  In fact, we don't need this test.  If the given addresses match the
  beginning/end of a hugepage VMA they must already be suitably aligned.  If
  they don't, then mprotect_fixup() will attempt to split the VMA.  The very
  first test in split_vma() will check for a badly aligned address on a
  hugepage VMA and return -EINVAL if necessary.

From: "Chen, Kenneth W" <kenneth.w.chen@intel.com>

  On i386 and x86-64, pte flag _PAGE_PSE collides with _PAGE_PROTNONE.  The
  identify of hugetlb pte is lost when changing page protection via mprotect.
  A page fault occurs later will trigger a bug check in huge_pte_alloc().

  The fix is to always make new pte a hugetlb pte and also to clean up
  legacy code where _PAGE_PRESENT is forced on in the pre-faulting day.

Signed-off-by: Zhang Yanmin <yanmin.zhang@intel.com>
Cc: David Gibson <david@gibson.dropbear.id.au>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: William Lee Irwin III <wli@holomorphy.com>
Signed-off-by: Ken Chen <kenneth.w.chen@intel.com>
Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-22 07:54:03 -08:00
..
acpi [ACPI] ACPICA 20060127 2006-01-31 03:25:09 -05:00
asm-alpha [PATCH] add asm-generic/mman.h 2006-02-15 15:32:22 -08:00
asm-arm [ARM] Fix cosmetic typo in asm/irq.h 2006-03-20 10:12:31 +00:00
asm-arm26 [PATCH] add asm-generic/mman.h 2006-02-15 15:32:22 -08:00
asm-cris [PATCH] add asm-generic/mman.h 2006-02-15 15:32:22 -08:00
asm-frv [PATCH] add asm-generic/mman.h 2006-02-15 15:32:22 -08:00
asm-generic [PATCH] add EXPORT_SYMBOL_GPL_FUTURE() 2006-03-20 13:42:58 -08:00
asm-h8300 [PATCH] add asm-generic/mman.h 2006-02-15 15:32:22 -08:00
asm-i386 [PATCH] Enable mprotect on huge pages 2006-03-22 07:54:03 -08:00
asm-ia64 [PATCH] Enable mprotect on huge pages 2006-03-22 07:54:03 -08:00
asm-m32r [PATCH] m32r: fix and update for gcc-4.0 2006-02-24 14:31:36 -08:00
asm-m68k [PATCH] m68k: fix cmpxchg compile errors if CONFIG_RMW_INSNS=n 2006-03-09 19:47:38 -08:00
asm-m68knommu [PATCH] m68knommu: hardirq.h needs definition of NR_IRQS 2006-02-07 16:16:54 -08:00
asm-mips Merge master.kernel.org:/pub/scm/linux/kernel/git/gregkh/usb-2.6 2006-03-21 09:25:47 -08:00
asm-parisc [PATCH] add asm-generic/mman.h 2006-02-15 15:32:22 -08:00
asm-powerpc [PATCH] powerpc: properly configure DDR/P5IOC children devs 2006-03-16 16:55:07 +11:00
asm-ppc [PATCH] powerpc: remove duplicate exports 2006-02-20 10:44:31 +11:00
asm-s390 [PATCH] mm: remove set_pgdir leftovers 2006-03-22 07:53:56 -08:00
asm-sh [PATCH] add asm-generic/mman.h 2006-02-15 15:32:22 -08:00
asm-sh64 [PATCH] mm: remove set_pgdir leftovers 2006-03-22 07:53:56 -08:00
asm-sparc [SPARC]: Fixup SO_PEERSEC value on 32-bit sparc. 2006-03-20 22:53:42 -08:00
asm-sparc64 [SPARC64]: Fix 2 bugs in huge page support. 2006-03-20 01:17:17 -08:00
asm-um [PATCH] uml: avoid "CONFIG_NR_CPUS undeclared" bogus error messages 2006-02-01 08:53:23 -08:00
asm-v850 [PATCH] add asm-generic/mman.h 2006-02-15 15:32:22 -08:00
asm-x86_64 [PATCH] Enable mprotect on huge pages 2006-03-22 07:54:03 -08:00
asm-xtensa [PATCH] add asm-generic/mman.h 2006-02-15 15:32:22 -08:00
keys
linux [PATCH] Enable mprotect on huge pages 2006-03-22 07:54:03 -08:00
math-emu
media V4L/DVB (3513): Remove saa711x driver 2006-03-21 08:53:40 -08:00
mtd
net [LLC]: llc_mac_hdr_init const arguments 2006-03-20 22:59:36 -08:00
pcmcia [PATCH] pcmcia: Add macro to match PCMCIA cards by numeric ID and first vendor string 2006-03-01 11:11:26 +01:00
rdma IB/umad: Add support for large RMPP transfers 2006-03-20 10:08:23 -08:00
rxrpc
scsi Merge branch 'master' 2006-02-20 02:16:23 -05:00
sound
video [PATCH] neofb: avoid resetting display config on unblank (v2) 2006-02-15 15:32:21 -08:00