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s390: Add ftrace_stub_graph

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This is the s390 variant of commit f3a0c23f25 ("riscv: Add
ftrace_stub_graph"):

"Commit 883bbbffa5 ("ftrace,kcfi: Separate ftrace_stub() and
ftrace_stub_graph()") added a separate ftrace_stub_graph function for
CFI_CLANG. Add the stub to fix FUNCTION_GRAPH_TRACER compatibility
with CFI."

Reviewed-by: Jens Remus <jremus@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2026-07-27 16:05:10 +02:00 committed by Vasily Gorbik
parent 1ccbfc99ce
commit 9ac687a280
1 changed files with 8 additions and 1 deletions
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9
arch/s390/kernel/mcount.S
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@ -4,6 +4,7 @@
*
*/
#include <linux/cfi_types.h>
#include <linux/linkage.h>
#include <asm/asm-offsets.h>
#include <asm/ftrace.h>
@ -34,10 +35,16 @@
.section .kprobes.text, "ax"
SYM_FUNC_START(ftrace_stub)
SYM_TYPED_FUNC_START(ftrace_stub)
BR_EX %r14
SYM_FUNC_END(ftrace_stub)
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
SYM_TYPED_FUNC_START(ftrace_stub_graph)
BR_EX %r14
SYM_FUNC_END(ftrace_stub_graph)
#endif
SYM_CODE_START(ftrace_stub_direct_tramp)
lgr %r1, %r0
BR_EX %r1