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s390: always use the packed stack layout

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-mpacked-stack option has been supported by both minimum
gcc and clang versions for a while. With commit e2bc3e91d9
("scripts/min-tool-version.sh: Raise minimum clang version to 13.0.0
for s390") minimum clang version now also supports a combination
of flags -mpacked-stack -mbackchain -pg -mfentry and fulfills
all requirements to always enable the packed stack layout.

Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Vasily Gorbik
2022-01-29 00:34:13 +01:00
parent 9a4f03ad6d
commit 42b01a553a
5 changed files with 5 additions and 37 deletions
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10
arch/s390/include/asm/stacktrace.h
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@@ -36,22 +36,14 @@ static inline bool on_stack(struct stack_info *info,
/*
* Stack layout of a C stack frame.
* Kernel uses the packed stack layout (-mpacked-stack).
*/
#ifndef __PACK_STACK
struct stack_frame {
unsigned long back_chain;
unsigned long empty1[5];
unsigned long gprs[10];
unsigned int empty2[8];
};
#else
struct stack_frame {
unsigned long empty1[5];
unsigned int empty2[8];
unsigned long gprs[10];
unsigned long back_chain;
};
#endif
/*
* Unlike current_stack_pointer() which simply returns current value of %r15