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s390: avoid __builtin_return_address(n) on clang

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llvm on s390 has problems with __builtin_return_address(n), with n>0,
this results in a somewhat cryptic error message:

fatal error: error in backend: Unsupported stack frame traversal count

To work around it, use the direct return address directly. This
is probably not ideal here, but gets things to compile and should
only lead to inferior reporting, not to misbehavior of the generated
code.

Link: https://bugs.llvm.org/show_bug.cgi?id=41424
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Arnd Bergmann 2019-04-08 23:26:23 +02:00 committed by Martin Schwidefsky
parent 475c8e9e89
commit 6e042492a2
1 changed files with 5 additions and 0 deletions
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5
arch/s390/include/asm/ftrace.h
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@ -13,7 +13,12 @@
#ifndef __ASSEMBLY__
#ifdef CONFIG_CC_IS_CLANG
/* https://bugs.llvm.org/show_bug.cgi?id=41424 */
#define ftrace_return_address(n) 0UL
#else
#define ftrace_return_address(n) __builtin_return_address(n)
#endif
void _mcount(void);
void ftrace_caller(void);