linux-toradex.git/arch/s390/kernel/traps.c, branch v3.15

s390/dumpstack: fix call chain walking

2013-04-17T12:07:28+00:00

dumpstack() did not always print a sane callchain when being called.
The reason is that show_trace() accessed register 15 directly to get
the current stack pointer and passed that pointer to __show_trace()
which expects a valid stack frame pointer as argument.
However due to tail call optimization the stack frame may not exist
anymore when __show_trace() gets called and therefore an invalid
stack frame pointer gets passed.
To prevent that disable tail call optimization for call chain walking
functions.
So move all the show_* functions to a dumpstack.c file like other
architectures have it already and add a -fno-optimize-sibling-calls
compile flag to both dumpstack.c and stacktrace.c to prevent tail
call optimization.

Fixes callchains that looked e.g. like this:

[   12.868258] Call Trace:
[   12.868262] ([<0000000000008000>] 0x8000)

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

taint: add explicit flag to show whether lock dep is still OK.

2013-01-21T06:47:57+00:00

Fix up all callers as they were before, with make one change: an
unsigned module taints the kernel, but doesn't turn off lockdep.

Signed-off-by: Rusty Russell

s390/traps: preinitialize program check table

2012-11-23T10:14:25+00:00

Preinitialize the program check table, so we can put it into the
read-only data section.
Also use only four byte entries for the table, since each program
check handler resides within the first 2GB. Therefore this reduces
the size of the table by 50% on 64 bit builds.

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

s390/traps: move call to print_modules() out of show_regs()

2012-09-26T13:45:27+00:00

Same as 0fa0e2f0 "x86: Move call to print_modules() out of show_regs()".

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

s390/exceptions: switch to relative exception table entries

2012-09-26T13:45:10+00:00

This is the s390 port of 70627654 "x86, extable: Switch to relative
exception table entries".
Reduces the size of our exception tables by 50% on 64 bit builds.

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

s390: add support for transactional memory

2012-09-26T13:45:02+00:00

Allow user-space processes to use transactional execution (TX).
If the TX facility is available user space programs can use
transactions for fine-grained serialization based on the data
objects that are referenced during a transaction. This is
useful for lockless data structures and speculative compiler
optimizations.

Signed-off-by: Martin Schwidefsky

s390: make use of user_mode() macro where possible

2012-07-30T09:03:12+00:00

We use the user_mode() helper already at several places but also
have the open coded variant at other places.
Convert the code to always use the helper function.

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

s390/comments: unify copyright messages and remove file names

2012-07-20T09:15:04+00:00

Remove the file name from the comment at top of many files. In most
cases the file name was wrong anyway, so it's rather pointless.

Also unify the IBM copyright statement. We did have a lot of sightly
different statements and wanted to change them one after another
whenever a file gets touched. However that never happened. Instead
people start to take the old/"wrong" statements to use as a template
for new files.
So unify all of them in one go.

Signed-off-by: Heiko Carstens

Disintegrate asm/system.h for S390

2012-03-28T17:30:02+00:00

Disintegrate asm/system.h for S390.

Signed-off-by: David Howells 
cc: linux-s390@vger.kernel.org

[S390] stack dump: fix indentation in output

2012-03-11T15:59:29+00:00

The first line of a stack dump has a wrong (no) indentation.
Just fix this after more than 10 years.

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