linux-toradex.git/arch/ia64, branch v2.6.16

[IA64] Fix race in the accessed/dirty bit handlers

2006-03-09T00:07:55+00:00

A pte may be zapped by the swapper, exiting process, unmapping or page
migration while the accessed or dirty bit handers are about to run. In that
case the accessed bit or dirty is set on an zeroed pte which leads the VM to
conclude that this is a swap pte. This may lead to

- Messages from the vm like

swap_free: Bad swap file entry 4000000000000000

- Processes being aborted

swap_dup: Bad swap file entry 4000000000000000
VM: killing process ....

Page migration is particular suitable for the creation of this race since
it needs to remove and restore page table entries.

The fix here is to check for the present bit and simply not update
the pte if the page is not present anymore. If the page is not present
then the fault handler should run next which will take care of the problem
by bringing the page back and then mark the page dirty or move it onto the
active list.

Signed-off-by: Christoph Lameter 
Signed-off-by: Tony Luck

[IA64] mca recovery return value when no bus check

2006-03-07T23:40:06+00:00

When there is no bus check, the return code should be failure, not success.

Signed-off-by: Russ Anderson (rja@sgi.com)
Signed-off-by: Tony Luck

[IA64] don't report !sn2 or !summit hardware as an error

2006-03-07T23:26:49+00:00

This stuff is all in the generic ia64 kernel, and the new initcall error
reporting complains about them.

Signed-off-by: Bjorn Helgaas 
Signed-off-by: Tony Luck

[IA64] gensparse_defconfig: turn on PNPACPI

2006-03-07T23:25:29+00:00

Turn on CONFIG_PNPACPI.  I recently removed 8250_acpi.c.  All devices
previously claimed by 8250_acpi.c should now be claimed by 8250_pnp.c.
This depends on having CONFIG_PNPACPI so ACPI devices show up as PNP
devices.

All other ia64 defconfigs either have CONFIG_PNPACPI already, or
don't have 8250 support turned on at all.

Signed-off-by: Bjorn Helgaas 
Signed-off-by: Tony Luck

[IA64] Increase severity of MCA recovery messages

2006-03-07T23:23:25+00:00

The MCA recovery messages are currently KERN_DEBUG,
so they don't show up in /var/log/messages (by default).
Increase the severity to KERN_ERR, for the initial
message (and also add the physical address to this
message). Leave the successful isolation message as
KERN_DEBUG, but increase the severity when isolation
fails to KERN_CRIT.

[Russ' patch made these all KERN_CRIT]

Signed-off-by: Russ Anderson (rja@sgi.com)
Signed-off-by: Tony Luck

[IA64] sysctl option to silence unaligned trap warnings

2006-02-28T17:42:23+00:00

Allow sysadmin to disable all warnings about userland apps
making unaligned accesses by using:
 # echo 1 > /proc/sys/kernel/ignore-unaligned-usertrap
Rather than having to use prctl on a process by process basis.

Default behaivour leaves the warnings enabled.

Signed-off-by: Jes Sorensen 
Signed-off-by: Tony Luck

[IA64] cleanup in fsys.S

2006-02-28T16:53:32+00:00

beautify coding style for zeroing end of fsyscall_table entries.
Remove misleading __NR_syscall_last and add more comments.
Drop (now unneeded) "guard against failure to increase NR_syscalls"

Signed-off-by: Ken Chen 
Signed-off-by: Tony Luck

[IA64] refresh default config files

2006-02-28T01:07:14+00:00

Bring all ia64 config files up to date

Signed-off-by: Tony Luck

[IA64] die_if_kernel() can return

2006-02-28T00:18:58+00:00

arch/ia64/kernel/unaligned.c erroneously marked die_if_kernel()
with a "noreturn" attribute ... which is silly (it returns whenever
the argument regs say that the fault happened in user mode, as one
might expect given the "if_kernel" part of its name!).  Thanks to
Alan and Gareth for pointing this out.

Signed-off-by: Tony Luck

[IA64-SGI] revert export sn_pcidev_info_get

2006-02-27T23:41:58+00:00

Christoph Hellwig  pointed that there are no
in-tree uses of this.  So revert 9c65cb9be62ac4993a5b392304b82e4f04f010fd

Signed-off-by: Tony Luck