linux-kernel - Re: [PATCH -tip v3 07/11] ia64: Add instruction_pointer

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Message-Id: <20210320100428.7cd2acb7d5c084ce293249d9@kernel.org>
Date:   Sat, 20 Mar 2021 10:04:28 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...nel.org>, X86 ML <x86@...nel.org>,
        Daniel Xu <dxu@...uu.xyz>, linux-kernel@...r.kernel.org,
        bpf@...r.kernel.org, kuba@...nel.org, mingo@...hat.com,
        ast@...nel.org, tglx@...utronix.de, kernel-team@...com, yhs@...com,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        linux-ia64@...r.kernel.org
Subject: Re: [PATCH -tip v3 07/11] ia64: Add instruction_pointer_set() API

On Fri, 19 Mar 2021 21:23:01 +0900
Masami Hiramatsu <mhiramat@...nel.org> wrote:

> Add instruction_pointer_set() API for ia64.
> 
> Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
> ---
>  arch/ia64/include/asm/ptrace.h |    8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/ia64/include/asm/ptrace.h b/arch/ia64/include/asm/ptrace.h
> index b3aa46090101..e382f1a6bff3 100644
> --- a/arch/ia64/include/asm/ptrace.h
> +++ b/arch/ia64/include/asm/ptrace.h
> @@ -45,6 +45,7 @@
>  #include <asm/current.h>
>  #include <asm/page.h>
>  
> +# define ia64_psr(regs)			((struct ia64_psr *) &(regs)->cr_ipsr)
>  /*
>   * We use the ia64_psr(regs)->ri to determine which of the three
>   * instructions in bundle (16 bytes) took the sample. Generate
> @@ -71,6 +72,12 @@ static inline long regs_return_value(struct pt_regs *regs)
>  		return -regs->r8;
>  }
>  
> +static inline void instruction_pointer_set(struct pt_regs *regs, unsigned long val)
> +{
> +	ia64_psr(regs)->ri = (val & 0xf);
> +	regs->cr_iip = (val & ~0xfULL);
> +}

Oops, this caused a build error. Thanks for the kernel test bot.

It seems that all code which accessing to the "struct ia64_psr" in asm/ptrace.h
has to be a macro, because "struct ia64_psr" is defined in the asm/processor.h
which includes asm/ptrace.h (for pt_regs?).
If the code is defined as an inline function, the "struct ia64_psr" is evaluated
at that point, and caused build error.

arch/ia64/include/asm/ptrace.h:77:16: error: dereferencing pointer to incomplete type 'struct ia64_psr'

But macro code evaluation is postponed until it is used...

Let me update it.

Thank you,

-- 
Masami Hiramatsu <mhiramat@...nel.org>