linux-toradex.git/arch/s390/kernel, branch v3.2.9

S390: correct ktime to tod clock comparator conversion

2012-03-01T00:30:53+00:00

commit cf1eb40f8f5ea12c9e569e7282161fc7f194fd62 upstream.

The conversion of the ktime to a value suitable for the clock comparator
does not take changes to wall_to_monotonic into account. In fact the
conversion just needs the boot clock (sched_clock_base_cc) and the
total_sleep_time.

This is applicable to 3.2+ kernels.

Signed-off-by: Martin Schwidefsky 
Signed-off-by: Greg Kroah-Hartman

[S390] remove reset of system call restart on psw changes

2011-12-01T12:32:17+00:00

git commit 20b40a794baf3b4b "signal race with restarting system calls"
added code to the poke_user/poke_user_compat to reset the system call
restart information in the thread-info if the PSW address is changed.
The purpose of that change has been to workaround old gdbs that do
not know about the REGSET_SYSTEM_CALL. It turned out that this is not
a good idea, it makes the behaviour of the debuggee dependent on the
order of specific ptrace call, e.g. the REGSET_SYSTEM_CALL register
set needs to be written last. And the workaround does not really fix
old gdbs, inferior calls on interrupted restarting system calls do not
work either way.

Signed-off-by: Martin Schwidefsky

[S390] add missing .set function for NT_S390_LAST_BREAK regset

2011-12-01T12:32:17+00:00

The last breaking event address is a read-only value, the regset misses the
.set function. If a PTRACE_SETREGSET is done for NT_S390_LAST_BREAK we
get an oops due to a branch to zero:

Kernel BUG at 0000000000000002 verbose debug info unavailable
illegal operation: 0001 #1 SMP
...
Call Trace:
(<0000000000158294> ptrace_regset+0x184/0x188)
 <00000000001595b6> ptrace_request+0x37a/0x4fc
 <0000000000109a78> arch_ptrace+0x108/0x1fc
 <00000000001590d6> SyS_ptrace+0xaa/0x12c
 <00000000005c7a42> sysc_noemu+0x16/0x1c
 <000003fffd5ec10c> 0x3fffd5ec10c
Last Breaking-Event-Address:
 <0000000000158242> ptrace_regset+0x132/0x188

Add a nop .set function to prevent the branch to zero.

Signed-off-by: Martin Schwidefsky 
Cc: stable@kernel.org

[S390] ptrace inferior call interactions with TIF_SYSCALL

2011-12-01T12:32:17+00:00

The TIF_SYSCALL bit needs to be cleared if the debugger changes the state
of the ptraced process in regard to the presence of a system call.
Otherwise the system call will be restarted although the debugger set up
an inferior call.

Signed-off-by: Martin Schwidefsky

[S390] kdump: Replace is_kdump_kernel() with OLDMEM_BASE check

2011-12-01T12:32:17+00:00

In order to have the same behavior for kdump based stand-alone dump
as for the kexec method, the is_kdump_kernel() check (only true for
the kexec method) has to be replaced by the OLDMEM_BASE check (true
for both methods).

Signed-off-by: Michael Holzheu 
Signed-off-by: Martin Schwidefsky

[S390] topology: fix topology on z10 machines

2011-11-14T10:19:09+00:00

Make sure that all cpus in a book on a z10 appear as book siblings
and not as core siblings. This fixes some performance regressions that
appeared after the book scheduling domain got introduced.

Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

[S390] avoid STCKF if running in ESA mode

2011-11-14T10:19:09+00:00

In ESA mode STCKF is not defined even if the facility bit is enabled.
To prevent an illegal operation we must also check if we run a 64 bit kernel.
To make the check perform well add the STCKF bit to the machine flags.

Signed-off-by: Jan Glauber 
Signed-off-by: Martin Schwidefsky

[S390] zfcpdump: Do not initialize zfcpdump in kdump mode

2011-11-14T10:19:09+00:00

When the kernel is started in kdump mode, zfcpdump should not be
initialized because both dump methods can't be used at the same time.

Signed-off-by: Michael Holzheu 
Signed-off-by: Martin Schwidefsky

[S390] incorrect note program header

2011-11-14T10:19:08+00:00

'readelf -n' on the s390 vmlinux file generates lots of warnings about
corrupt notes. The reason is that the 'NOTE' program header has incorrect
file and memory sizes. The problem is that the section following the
NOTES section do not switch to a different phdr and they get added to
the NOTE program section. Add a dummy entry to the linker script that
switches to the data phdr before the start of the RODATA section.

Signed-off-by: Martin Schwidefsky

[S390] wire up process_vm syscalls

2011-11-14T10:19:08+00:00

Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky