linux-kernel - Re: [PATCH v2 03/19] gendwarfksyms: Add address matching

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Message-ID: <CAK7LNAQs8E1pKo1Bcn4RUAkGbBFPmUsWRRrQCnUUiB588FB09A@mail.gmail.com>
Date: Sun, 1 Sep 2024 20:10:33 +0900
From: Masahiro Yamada <masahiroy@...nel.org>
To: Sami Tolvanen <samitolvanen@...gle.com>
Cc: Luis Chamberlain <mcgrof@...nel.org>, Miguel Ojeda <ojeda@...nel.org>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Matthew Maurer <mmaurer@...gle.com>, 
	Alex Gaynor <alex.gaynor@...il.com>, Wedson Almeida Filho <wedsonaf@...il.com>, Gary Guo <gary@...yguo.net>, 
	Petr Pavlu <petr.pavlu@...e.com>, Neal Gompa <neal@...pa.dev>, Hector Martin <marcan@...can.st>, 
	Janne Grunau <j@...nau.net>, Asahi Linux <asahi@...ts.linux.dev>, linux-kbuild@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-modules@...r.kernel.org, 
	rust-for-linux@...r.kernel.org
Subject: Re: [PATCH v2 03/19] gendwarfksyms: Add address matching

On Fri, Aug 16, 2024 at 2:39 AM Sami Tolvanen <samitolvanen@...gle.com> wrote:
>
> The compiler may choose not to emit type information in DWARF for all
> aliases, but it's possible for each alias to be exported separately.
> To ensure we find type information for the aliases as well, read
> {section, address} tuples from the symbol table and match symbols also
> by address.
>
> Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>
> ---

> +
> +static int set_symbol_addr(struct symbol *sym, void *arg)
> +{
> +       struct symbol_addr *addr = arg;
> +
> +       if (sym->addr.section == SHN_UNDEF) {
> +               sym->addr.section = addr->section;
> +               sym->addr.address = addr->address;


These two lines can be replaced with

                  sym->addr = *addr;





--
Best Regards
Masahiro Yamada