diff options
| author | Florent Revest <revest@chromium.org> | 2023-04-27 16:06:59 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-07-23 13:49:44 +0200 |
| commit | e2c7a05a48e589af6153718b046dd9cd1d38854b (patch) | |
| tree | b5e1a59ff76bce7156962b62564943bb462d65c8 /samples | |
| parent | 9d6a260bbfbc606bfd5089afc080b0e068be6ac0 (diff) | |
| download | linux-e2c7a05a48e589af6153718b046dd9cd1d38854b.tar.gz | |
samples: ftrace: Save required argument registers in sample trampolines
commit 8564c315876ab86fcaf8e7f558d6a84cb2ce5590 upstream.
The ftrace-direct-too sample traces the handle_mm_fault function whose
signature changed since the introduction of the sample. Since:
commit bce617edecad ("mm: do page fault accounting in handle_mm_fault")
handle_mm_fault now has 4 arguments. Therefore, the sample trampoline
should save 4 argument registers.
s390 saves all argument registers already so it does not need a change
but x86_64 needs an extra push and pop.
This also evolves the signature of the tracing function to make it
mirror the signature of the traced function.
Link: https://lkml.kernel.org/r/20230427140700.625241-2-revest@chromium.org
Cc: stable@vger.kernel.org
Fixes: bce617edecad ("mm: do page fault accounting in handle_mm_fault")
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Florent Revest <revest@chromium.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'samples')
| -rw-r--r-- | samples/ftrace/ftrace-direct-too.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/samples/ftrace/ftrace-direct-too.c b/samples/ftrace/ftrace-direct-too.c index 6690468c5cc2..14c6859e1ac4 100644 --- a/samples/ftrace/ftrace-direct-too.c +++ b/samples/ftrace/ftrace-direct-too.c @@ -5,14 +5,14 @@ #include <linux/ftrace.h> #include <asm/asm-offsets.h> -extern void my_direct_func(struct vm_area_struct *vma, - unsigned long address, unsigned int flags); +extern void my_direct_func(struct vm_area_struct *vma, unsigned long address, + unsigned int flags, struct pt_regs *regs); -void my_direct_func(struct vm_area_struct *vma, - unsigned long address, unsigned int flags) +void my_direct_func(struct vm_area_struct *vma, unsigned long address, + unsigned int flags, struct pt_regs *regs) { - trace_printk("handle mm fault vma=%p address=%lx flags=%x\n", - vma, address, flags); + trace_printk("handle mm fault vma=%p address=%lx flags=%x regs=%p\n", + vma, address, flags, regs); } extern void my_tramp(void *); @@ -32,7 +32,9 @@ asm ( " pushq %rdi\n" " pushq %rsi\n" " pushq %rdx\n" +" pushq %rcx\n" " call my_direct_func\n" +" popq %rcx\n" " popq %rdx\n" " popq %rsi\n" " popq %rdi\n" |