Re: [PATCH v18 01/17] fgraph: Pass ftrace_regs to entryfunc

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On Sat, Oct 26, 2024 at 01:35:30PM +0900, Masami Hiramatsu (Google) wrote:
> From: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>
> 
> Pass ftrace_regs to the fgraph_ops::entryfunc(). If ftrace_regs is not
> available, it passes a NULL instead. User callback function can access
> some registers (including return address) via this ftrace_regs.
> 
> Note that the ftrace_regs can be NULL when the arch does NOT define:
> HAVE_DYNAMIC_FTRACE_WITH_ARGS or HAVE_DYNAMIC_FTRACE_WITH_REGS.
> More specifically, if HAVE_DYNAMIC_FTRACE_WITH_REGS is defined but
> not the HAVE_DYNAMIC_FTRACE_WITH_ARGS, and the ftrace ops used to
> register the function callback does not set FTRACE_OPS_FL_SAVE_REGS.
> In this case, ftrace_regs can be NULL in user callback.
> 
> Signed-off-by: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>
> Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
> Cc: Mark Rutland <mark.rutland@xxxxxxx>
> Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
> Cc: Will Deacon <will@xxxxxxxxxx>
> Cc: Huacai Chen <chenhuacai@xxxxxxxxxx>
> Cc: WANG Xuerui <kernel@xxxxxxxxxx>
> Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
> Cc: Nicholas Piggin <npiggin@xxxxxxxxx>
> Cc: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
> Cc: Naveen N Rao <naveen@xxxxxxxxxx>
> Cc: Madhavan Srinivasan <maddy@xxxxxxxxxxxxx>
> Cc: Paul Walmsley <paul.walmsley@xxxxxxxxxx>
> Cc: Palmer Dabbelt <palmer@xxxxxxxxxxx>
> Cc: Albert Ou <aou@xxxxxxxxxxxxxxxxx>
> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Cc: Ingo Molnar <mingo@xxxxxxxxxx>
> Cc: Borislav Petkov <bp@xxxxxxxxx>
> Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
> Cc: x86@xxxxxxxxxx
> Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
> Cc: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
> 
> ---
>  Changes in v18:
>   - Remove unclear comment about `regs->fp` access on arm64.
>  Changes in v16:
>   - Add a note when the ftrace_regs can be NULL.
>   - Update against for the latest kernel.
>  Changes in v11:
>   - Update for the latest for-next branch.
>  Changes in v8:
>   - Just pass ftrace_regs to the handler instead of adding a new
>     entryregfunc.
>   - Update riscv ftrace_graph_func().
>  Changes in v3:
>   - Update for new multiple fgraph.
> ---
>  arch/arm64/kernel/ftrace.c               |   15 ++++++++-

For the arm64 bits:

Acked-by: Will Deacon <will@xxxxxxxxxx>

Will




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