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s390/ftrace: enforce DYNAMIC_FTRACE if FUNCTION_TRACER is selected 

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 <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2014-08-15 13:16:09 +02:00 committed by Martin Schwidefsky
parent 10dec7dbd5
commit 5d6a016349
5 changed files with 2 additions and 13 deletions
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1
arch/s390/Kconfig
View File

@ -97,6 +97,7 @@ config S390
select ARCH_WANT_IPC_PARSE_VERSION
select BUILDTIME_EXTABLE_SORT
select CLONE_BACKWARDS2
select DYNAMIC_FTRACE if FUNCTION_TRACER
select GENERIC_CLOCKEVENTS
select GENERIC_CPU_DEVICES if !SMP
select GENERIC_FIND_FIRST_BIT

4
arch/s390/kernel/Makefile
View File

@ -53,9 +53,7 @@ obj-$(CONFIG_COMPAT) += compat_wrapper.o $(compat-obj-y)
obj-$(CONFIG_STACKTRACE) += stacktrace.o
obj-$(CONFIG_KPROBES) += kprobes.o
obj-$(CONFIG_FUNCTION_TRACER) += $(if $(CONFIG_64BIT),mcount64.o,mcount.o)
obj-$(CONFIG_DYNAMIC_FTRACE) += ftrace.o
obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += ftrace.o
obj-$(CONFIG_FTRACE_SYSCALLS) += ftrace.o
obj-$(CONFIG_FUNCTION_TRACER) += ftrace.o
obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
ifdef CONFIG_64BIT

6
arch/s390/kernel/ftrace.c
View File

@ -17,8 +17,6 @@
#include <asm/asm-offsets.h>
#include "entry.h"
#ifdef CONFIG_DYNAMIC_FTRACE
void ftrace_disable_code(void);
void ftrace_enable_insn(void);
@ -142,8 +140,6 @@ int __init ftrace_dyn_arch_init(void)
return 0;
}
#endif /* CONFIG_DYNAMIC_FTRACE */
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
/*
* Hook the return address and push it in the stack of return addresses
@ -169,7 +165,6 @@ unsigned long __kprobes prepare_ftrace_return(unsigned long parent,
return parent;
}
#ifdef CONFIG_DYNAMIC_FTRACE
/*
* Patch the kernel code at ftrace_graph_caller location. The instruction
* there is branch relative and save to prepare_ftrace_return. To disable
@ -219,5 +214,4 @@ int ftrace_disable_ftrace_graph_caller(void)
}
#endif /* CONFIG_64BIT */
#endif /* CONFIG_DYNAMIC_FTRACE */
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */

2
arch/s390/kernel/mcount.S
View File

@ -15,11 +15,9 @@ ENTRY(ftrace_stub)
br %r14
ENTRY(_mcount)
#ifdef CONFIG_DYNAMIC_FTRACE
br %r14
ENTRY(ftrace_caller)
#endif
stm %r2,%r5,16(%r15)
bras %r1,1f
0: .long ftrace_trace_function

2
arch/s390/kernel/mcount64.S
View File

@ -22,13 +22,11 @@ ENTRY(ftrace_stub)
#define STACK_PTREGS_PSW (STACK_PTREGS + __PT_PSW)
ENTRY(_mcount)
#ifdef CONFIG_DYNAMIC_FTRACE
br %r14
ENTRY(ftrace_caller)
.globl ftrace_regs_caller
.set ftrace_regs_caller,ftrace_caller
#endif
lgr %r1,%r15
aghi %r15,-STACK_FRAME_SIZE
stg %r1,__SF_BACKCHAIN(%r15)