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s390/dumpstack: get rid of return_address again 

With commit ef6000b4c6 ("Disable the __builtin_return_address()
warning globally after all)" the kernel does not warn at all again if
__builtin_return_address(n) is called with n > 0.

Besides the fact that this was a false warning on s390 anyway, due to
the always present backchain, we can now revert commit 5606330627
("s390/dumpstack: implement and use return_address()") again, to
simplify the code again.

After all I shouldn't have had return_address() implememted at all to
workaround this issue. So get rid of this again.

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 2016-10-17 13:07:46 +02:00 committed by Martin Schwidefsky
parent 4d062487f3
commit dcddba96cd
2 changed files with 1 additions and 27 deletions
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4
arch/s390/include/asm/ftrace.h
View File

@ -12,9 +12,7 @@
#ifndef __ASSEMBLY__
unsigned long return_address(int depth);
#define ftrace_return_address(n) return_address(n)
#define ftrace_return_address(n) __builtin_return_address(n)
void _mcount(void);
void ftrace_caller(void);

24
arch/s390/kernel/dumpstack.c
View File

@ -87,30 +87,6 @@ void dump_trace(dump_trace_func_t func, void *data, struct task_struct *task,
}
EXPORT_SYMBOL_GPL(dump_trace);
struct return_address_data {
unsigned long address;
int depth;
};
static int __return_address(void *data, unsigned long address, int reliable)
{
struct return_address_data *rd = data;
if (rd->depth--)
return 0;
rd->address = address;
return 1;
}
unsigned long return_address(int depth)
{
struct return_address_data rd = { .depth = depth + 2 };
dump_trace(__return_address, &rd, NULL, current_stack_pointer());
return rd.address;
}
EXPORT_SYMBOL_GPL(return_address);
static int show_address(void *data, unsigned long address, int reliable)
{
if (reliable)