linux-toradex.git/arch/s390, branch v2.6.12.4

[PATCH] s390: deadlock in appldata

2005-06-05T00:13:00+00:00

The system might hang when using appldata_mem with high I/O traffic and a
large number of devices.  The spinlocks bdev_lock and swaplock are acquired
via calls to si_meminfo() and si_swapinfo() from a tasklet, i.e.  interrupt
context, which can lead to a deadlock.  Replace tasklet with work queue.

Signed-off-by: Martin Schwidefsky 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] s390: in_interrupt vs. in_atomic

2005-06-05T00:13:00+00:00

The condition for no context in do_exception checks for hard and soft
interrupts by using in_interrupt() but not for preemption.  This is bad for
the users of __copy_from/to_user_inatomic because the fault handler might call
schedule although the preemption count is != 0.  Use in_atomic() instead
in_interrupt().

Signed-off-by: Martin Schwidefsky 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] s390: uml ptrace fixes

2005-06-05T00:13:00+00:00

To make UML build and run on s390, I needed to do these two little
changes:

1) UML includes some of the subarch's (s390) headers. I had to
   change one of them with the following one-liner, to make this
   compile. AFAICS, this change doesn't break compilation of s390
   itself.

2) UML needs to intercept syscalls via ptrace to invalidate the syscall,
   read syscall's parameters and write the result with the result of
   UML's syscall processing. Also, UML needs to make sure, that the host
   does no syscall restart processing. On i386 for example, this can be
   done by writing -1 to orig_eax on the 2nd syscall interception
   (orig_eax is the syscall number, which after the interception is used
   as a "interrupt was a syscall" flag only.
   Unfortunately, s390 holds syscall number and syscall result in gpr2 and
   its "interrupt was a syscall" flag (trap) is unreachable via ptrace.
   So I changed the host to set trap to -1, if the syscall number is changed
   to an invalid value on the first syscall interception.

Signed-off-by: Martin Schwidefsky 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] s390: ptrace peek and poke

2005-06-05T00:13:00+00:00

The special cases of peek and poke on acrs[15] and the fpc register are not
handled correctly.  A poke on acrs[15] will clobber the 4 bytes after the
access registers in the thread_info structure.  That happens to be the kernel
stack pointer.  A poke on the fpc with an invalid value is not caught by the
validity check.  On the next context switch the broken fpc value will cause a
program check in the kernel.  Improving the checks in peek and poke fixes
this.

Signed-off-by: Martin Schwidefsky 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Merge with master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6.git

2005-05-03T07:14:09+00:00

[PATCH] convert that currently tests _NSIG directly to use valid_signal()

2005-05-01T15:59:14+00:00

Convert most of the current code that uses _NSIG directly to instead use
valid_signal().  This avoids gcc -W warnings and off-by-one errors.

Signed-off-by: Jesper Juhl 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] s390: remove ioctl32 from dasdcmb

2005-05-01T15:58:59+00:00

The ioctl32_conversion routines will be deprecated: Remove them from dasd_cmb
and handle the three cmb ioctls like all other dasd ioctls.

Signed-off-by: Martin Schwidefsky 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] s390: cmm guest sender id

2005-05-01T15:58:58+00:00

An arbitrary guest must not be allowed to trigger cmm actions.  Only one
specific guest namely the one that serves as the resource monitor may send cmm
messages.  Add a parameter that allows to specify the guest that may send
messages.  z/VMs resource manager has the name 'VMRMSVM' which is the default.

Signed-off-by: Martin Schwidefsky 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] s390: default storage key

2005-05-01T15:58:58+00:00

Provide an easy way to define a non-zero storage key at compile time.  This is
useful for debugging purposes.

Signed-off-by: Martin Schwidefsky 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] s390: fix memory holes and cleanup setup_arch

2005-05-01T15:58:57+00:00

The memory setup didn't take care of memory holes and this makes the memory
management think there would be more memory available than there is in
reality.  That causes the OOM killer to kill processes even if there is enough
memory left that can be written to the swap space.

The patch fixes this by using free_area_init_node with an array of memory
holes instead of free_area_init.  Further the patch cleans up the code in
setup.c by splitting setup_arch into smaller pieces.

Signed-off-by: Martin Schwidefsky 

Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds