s390/dumpstack: implement and use return_address()

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Implement return_address() and use it instead of __builtin_return_address(n).

__builtin_return_address(n) is not guaranteed to work for n > 0,
therefore implement a private return_address() function which walks
the stack frames and returns the proper return address.

This way we get also rid of a compile warning which gcc 6.1 emits and
look like all other architectures.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

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Heiko Carstens 2016-05-02 14:38:29 +02:00 • committed by Martin Schwidefsky

parent e18eb2d1eb

commit 5606330627

2 changed files with 27 additions and 1 deletions

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4

arch/s390/include/asm/ftrace.h

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24

arch/s390/kernel/dumpstack.c

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