linux-toradex.git/arch/powerpc, branch v2.6.18.3 Linux kernel for Apalis and Colibri modules [PATCH] POWERPC: Make alignment exception always check exception table 2006-11-19T03:27:58+00:00 Benjamin Herrenschmidt benh@kernel.crashing.org 2006-11-01T04:11:39+00:00 413f83a2b9826449d1b70961e55c482ec8309b49 The alignment exception used to only check the exception table for -EFAULT, not for other errors. That opens an oops window if we can coerce the kernel into getting an alignment exception for other reasons in what would normally be a user-protected accessor, which can be done via some of the futex ops. This fixes it by always checking the exception tables. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Chris Wright <chrisw@sous-sol.org> 
The alignment exception used to only check the exception table for
-EFAULT, not for other errors. That opens an oops window if we can
coerce the kernel into getting an alignment exception for other reasons
in what would normally be a user-protected accessor, which can be done
via some of the futex ops. This fixes it by always checking the
exception tables.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
[PATCH] Reintroduce NODES_SPAN_OTHER_NODES for powerpc 2006-11-04T01:33:49+00:00 Andy Whitcroft apw@shadowen.org 2006-10-21T17:24:14+00:00 d940c78f8aa3e60fe1681839833567b5632fe22a Revert "[PATCH] Remove SPAN_OTHER_NODES config definition" This reverts commit f62859bb6871c5e4a8e591c60befc8caaf54db8c. Revert "[PATCH] mm: remove arch independent NODES_SPAN_OTHER_NODES" This reverts commit a94b3ab7eab4edcc9b2cb474b188f774c331adf7. Also update the comments to indicate that this is still required and where its used. Signed-off-by: Andy Whitcroft <apw@shadowen.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Mike Kravetz <kravetz@us.ibm.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: Mel Gorman <mel@csn.ul.ie> Acked-by: Will Schmidt <will_schmidt@vnet.ibm.com> Cc: Christoph Lameter <clameter@sgi.com> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Chris Wright <chrisw@sous-sol.org> 
Revert "[PATCH] Remove SPAN_OTHER_NODES config definition"
    This reverts commit f62859bb6871c5e4a8e591c60befc8caaf54db8c.
Revert "[PATCH] mm: remove arch independent NODES_SPAN_OTHER_NODES"
    This reverts commit a94b3ab7eab4edcc9b2cb474b188f774c331adf7.

Also update the comments to indicate that this is still required
and where its used.

Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Mike Kravetz <kravetz@us.ibm.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Acked-by: Will Schmidt <will_schmidt@vnet.ibm.com>
Cc: Christoph Lameter <clameter@sgi.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc 2006-09-13T15:01:41+00:00 Linus Torvalds torvalds@g5.osdl.org 2006-09-13T15:01:41+00:00 63b98080daa35f0d682db04f4fb7ada010888752 * 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc: [POWERPC] Fix G5 DART (IOMMU) race causing occasional data corruption [POWERPC] Fix MMIO ops to provide expected barrier behaviour [POWERPC] Fix interrupt clearing in kdump shutdown sequence [POWERPC] update prep_defconfig [POWERPC] kdump: Support kernels having 64k page size. [POWERPC] Implement PowerPC futex_atomic_cmpxchg_inatomic(). [POWERPC] Add new, missing argument to of_irq_map_raw() for 86xx. [POWERPC] Update defconfigs 
* 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc:
  [POWERPC] Fix G5 DART (IOMMU) race causing occasional data corruption
  [POWERPC] Fix MMIO ops to provide expected barrier behaviour
  [POWERPC] Fix interrupt clearing in kdump shutdown sequence
  [POWERPC] update prep_defconfig
  [POWERPC] kdump: Support kernels having 64k page size.
  [POWERPC] Implement PowerPC futex_atomic_cmpxchg_inatomic().
  [POWERPC] Add new, missing argument to of_irq_map_raw() for 86xx.
  [POWERPC] Update defconfigs
[POWERPC] Fix G5 DART (IOMMU) race causing occasional data corruption 2006-09-13T12:12:52+00:00 Benjamin Herrenschmidt benh@kernel.crashing.org 2006-09-13T12:12:52+00:00 eeac5c142b8687e35780b11b54b4c2f95b1a2436 It seems that the occasional data corruption observed with the tg3 driver wasn't due to missing barriers after all, but rather seems to be due to the DART (= IOMMU) in the U4 northbridge reading stale IOMMU table entries from memory due to a race. This fixes it by making the CPU read the entry back from memory before using it. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org> 
It seems that the occasional data corruption observed with the tg3
driver wasn't due to missing barriers after all, but rather seems to
be due to the DART (= IOMMU) in the U4 northbridge reading stale
IOMMU table entries from memory due to a race.  This fixes it by
making the CPU read the entry back from memory before using it.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
 [POWERPC] Fix MMIO ops to provide expected barrier behaviour 2006-09-13T12:08:26+00:00 Paul Mackerras paulus@samba.org 2006-09-13T12:08:26+00:00 f007cacffc8870702a1473d83ba5e4922d54e17c This changes the writeX family of functions to have a sync instruction before the MMIO store rather than after, because the generally expected behaviour is that the device receiving the MMIO store can be guaranteed to see the effects of any preceding writes to normal memory. To preserve ordering between writeX and readX, and to preserve ordering between preceding stores and the readX, the readX family of functions have had an sync added before the load. Although writeX followed by spin_unlock is not officially guaranteed to keep the writeX inside the spin-locked region unless an mmiowb() is used, there are currently drivers that depend on the previous behaviour on powerpc, which was that the mmiowb wasn't actually required. Therefore we have a per-cpu flag that is set by writeX, cleared by __raw_spin_lock and mmiowb, and tested by __raw_spin_unlock. If it is set, __raw_spin_unlock does a sync and clears it. This changes both 32-bit and 64-bit readX/writeX. 32-bit already has a sync in __raw_spin_unlock (since lwsync doesn't exist on 32-bit), and thus doesn't need the per-cpu flag. Tested on G5 (PPC970) and POWER5. Signed-off-by: Paul Mackerras <paulus@samba.org> 
This changes the writeX family of functions to have a sync instruction
before the MMIO store rather than after, because the generally expected
behaviour is that the device receiving the MMIO store can be guaranteed
to see the effects of any preceding writes to normal memory.

To preserve ordering between writeX and readX, and to preserve ordering
between preceding stores and the readX, the readX family of functions
have had an sync added before the load.

Although writeX followed by spin_unlock is not officially guaranteed
to keep the writeX inside the spin-locked region unless an mmiowb()
is used, there are currently drivers that depend on the previous
behaviour on powerpc, which was that the mmiowb wasn't actually required.
Therefore we have a per-cpu flag that is set by writeX, cleared by
__raw_spin_lock and mmiowb, and tested by __raw_spin_unlock.  If it is
set, __raw_spin_unlock does a sync and clears it.

This changes both 32-bit and 64-bit readX/writeX.  32-bit already has a
sync in __raw_spin_unlock (since lwsync doesn't exist on 32-bit), and thus
doesn't need the per-cpu flag.

Tested on G5 (PPC970) and POWER5.

Signed-off-by: Paul Mackerras <paulus@samba.org>
 [POWERPC] Fix interrupt clearing in kdump shutdown sequence 2006-09-13T08:31:23+00:00 Mohan Kumar M mohan@in.ibm.com 2006-09-12T12:18:21+00:00 2e8e8dacc566cc91cd8707cb092e76c7bbfab178 Call chip->eoi(irq) to clear any pending interrupt in case of kdump shutdown sequence. chip->end(irq) does not serve this purpose. Signed-off-by: Mohan Kumar M <mohan@in.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org> 
Call chip->eoi(irq) to clear any pending interrupt in case of kdump
shutdown sequence.  chip->end(irq) does not serve this purpose.

Signed-off-by: Mohan Kumar M <mohan@in.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
[POWERPC] Add new, missing argument to of_irq_map_raw() for 86xx. 2006-09-13T08:28:28+00:00 Jon Loeliger jdl@freescale.com 2006-09-01T15:17:20+00:00 20fb96e2aa009ae9892fde9ef7ffa82f56eebd11 Ben speaks; we follow. Signed-off-by: Jon Loeliger <jdl@freescale.com> Signed-off-by: Paul Mackerras <paulus@samba.org> 
Ben speaks; we follow.

Signed-off-by: Jon Loeliger <jdl@freescale.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
[PATCH] syscall class hookup for all normal targets 2006-09-12T07:04:40+00:00 Al Viro viro@zeniv.linux.org.uk 2006-09-12T07:04:40+00:00 e65e1fc2d24b09c496af76e9c5253ac30b300a89 Take default arch/*/kernel/audit.c to lib/, have those with special needs (== biarch) define AUDIT_ARCH in their Kconfig. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> 
Take default arch/*/kernel/audit.c to lib/, have those with special
needs (== biarch) define AUDIT_ARCH in their Kconfig.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
[PATCH] audit: AUDIT_PERM support 2006-09-11T17:32:30+00:00 Al Viro viro@zeniv.linux.org.uk 2006-08-31T23:26:40+00:00 55669bfa141b488be865341ed12e188967d11308 add support for AUDIT_PERM predicate Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> 
add support for AUDIT_PERM predicate

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
[PATCH] audit: more syscall classes added 2006-09-11T17:32:27+00:00 Al Viro viro@zeniv.linux.org.uk 2006-08-31T23:05:56+00:00 dc104fb3231f11e95b5a0f09ae3ab27a8fd5b2e8 Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> 
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>