kernel.git/arch/s390/kernel/mcount.S, branch linux-3.18.y

s390/ftrace: simplify enabling/disabling of ftrace_graph_caller

2014-10-09T07:14:20Z

We can simply patch the mask field within the branch relative on condition instruction at the beginning of the ftrace_graph_caller code block. This makes the logic even simpler and we get rid of the displacement calculation. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

s390/ftrace: remove 31 bit ftrace support

2014-10-09T07:14:18Z

31 bit and 64 bit diverge more and more and it is rather painful to keep both parts running. To make things simpler just remove the 31 bit support which nobody uses anyway. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

s390/ftrace: enforce DYNAMIC_FTRACE if FUNCTION_TRACER is selected

2014-09-09T06:53:29Z

We have too many combinations for function tracing. Lets simply stick to the most advanced option, so we don't have to care of other combinations. This means we always select DYNAMIC_FTRACE if FUNCTION_TRACER is selected. In the s390 Makefile also remove CONFIG_FTRACE_SYSCALLS since that functionality got moved to architecture independent code in the meantime. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

s390/ftrace: remove check of obsolete variable function_trace_stop

2014-07-18T17:58:11Z

Remove check of obsolete variable function_trace_stop as requested by Steven Rostedt. Signed-off-by: Heiko Carstens Signed-off-by: Steven Rostedt

s390/ftrace: fix mcount adjustment

2013-05-15T11:09:09Z

Tony Jones reported that the ftrace self tests on s390 do not work: <6>Testing dynamic ftrace ops #1: (0 0 0 0 0) FAILED! <6>Testing tracer irqsoff: <3>failed to start irqsoff tracer <4>.. no entries found ..FAILED! <6>Testing tracer wakeup: <3>failed to start wakeup tracer <4>.. no entries found ..FAILED! <6>Testing tracer function_graph: <4>Failed to init function_graph tracer, init returned -19 <4>FAILED! This happens because we forgot to adjust the instruction pointer that gets passed to the ftrace trace function by MCOUNT_INSN_SIZE. In addition change MCOUNT_INSN_SIZE to the correct value on 31 bit. It only worked so far because the to be patched instruction was identical. Reported-by: Tony Jones Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

s390/comments: unify copyright messages and remove file names

2012-07-20T09:15:04Z

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

[S390] fix s390 assembler code alignments

2011-07-24T08:48:21Z

The alignment is missing for various global symbols in s390 assembly code. With a recent gcc and an instruction like stgrl this can lead to a specification exception if the instruction uses such a mis-aligned address. Specify the alignment explicitely and while add it define __ALIGN for s390 and use the ENTRY define to save some lines of code. Signed-off-by: Jan Glauber Signed-off-by: Martin Schwidefsky

[S390] cleanup ftrace backend functions

2011-01-05T11:47:31Z

Signed-off-by: Martin Schwidefsky

[S390] add kprobes annotations

2011-01-05T11:47:24Z

Add kprobes annotations to get the massive 'probe kernel.function("*") {}' stress test working. Signed-off-by: Martin Schwidefsky

[S390] improve mcount code

2009-09-11T08:29:43Z

Move the 64 bit mount code from mcount.S into mcount64.S and avoid code duplication. Signed-off-by: Martin Schwidefsky