linux-kernel - Re: [PATCH v3 09/10] objtool: Make unwind hints definitions available to other architectures

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Date:   Fri, 4 Sep 2020 13:49:04 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Julien Thierry <jthierry@...hat.com>
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org, mbenes@...e.cz,
        raphael.gault@....com, benh@...nel.crashing.org
Subject: Re: [PATCH v3 09/10] objtool: Make unwind hints definitions
 available to other architectures

On Fri, Sep 04, 2020 at 04:30:27PM +0100, Julien Thierry wrote:
> +/*
> + * UNWIND_HINT_TYPE_CALL: Indicates that sp_reg+sp_offset resolves to PREV_SP
> + * (the caller's SP right before it made the call).  Used for all callable
> + * functions, i.e. all C code and all callable asm functions.
> + *
> + * UNWIND_HINT_TYPE_REGS: Used in entry code to indicate that sp_reg+sp_offset
> + * points to a fully populated pt_regs from a syscall, interrupt, or exception.
> + *
> + * UNWIND_HINT_TYPE_REGS_IRET: Used in entry code to indicate that sp_reg+sp_offset
> + * points to the iret return frame.

Now that this is generic, I think REGS_PARTIAL would be better.

> + *
> + * The UNWIND_HINT macros are used only for the unwind_hint struct.  They
> + * aren't used in struct orc_entry due to size and complexity constraints.
> + * Objtool converts them to real types when it converts the hints to orc
> + * entries.

Now that ORC_TYPE_* have been replaced by UNWIND_HINT_TYPE_*, I think
this last paragraph should be removed.

-- 
Josh