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s390/ftrace: enforce DYNAMIC_FTRACE if FUNCTION_TRACER is selected

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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
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@ -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
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@ -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 @@ out:
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)