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| author | Heiko Carstens <hca@linux.ibm.com> | 2021-10-12 16:37:59 +0300 |
|---|---|---|
| committer | Vasily Gorbik <gor@linux.ibm.com> | 2021-10-19 16:39:53 +0300 |
| commit | 2ab3a0a9fad846e751148e9cdeda85a8f7765f31 (patch) | |
| tree | 3de33a636ee0208fb3eaae71dcf94476c97dd7fc /arch/s390/include/asm/ftrace.h | |
| parent | b2f583937aad0e43cdf18186070e5502983f60fd (diff) | |
| download | linux-2ab3a0a9fad846e751148e9cdeda85a8f7765f31.tar.xz | |
s390/ftrace: add HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALL support
This is the s390 variant of commit 562955fe6a55 ("ftrace/x86: Add
register_ftrace_direct() for custom trampolines").
Acked-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Link: https://lore.kernel.org/r/20211012133802.2460757-2-hca@linux.ibm.com
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/ftrace.h')
| -rw-r--r-- | arch/s390/include/asm/ftrace.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/s390/include/asm/ftrace.h b/arch/s390/include/asm/ftrace.h index 4a721b44d4f4..267f70f4393f 100644 --- a/arch/s390/include/asm/ftrace.h +++ b/arch/s390/include/asm/ftrace.h @@ -59,6 +59,18 @@ static __always_inline void ftrace_instruction_pointer_set(struct ftrace_regs *f } /* + * When an ftrace registered caller is tracing a function that is + * also set by a register_ftrace_direct() call, it needs to be + * differentiated in the ftrace_caller trampoline. To do this, + * place the direct caller in the ORIG_GPR2 part of pt_regs. This + * tells the ftrace_caller that there's a direct caller. + */ +static inline void arch_ftrace_set_direct_caller(struct pt_regs *regs, unsigned long addr) +{ + regs->orig_gpr2 = addr; +} + +/* * Even though the system call numbers are identical for s390/s390x a * different system call table is used for compat tasks. This may lead * to e.g. incorrect or missing trace event sysfs files. |