linux-kernel - Re: [PATCH v5 18/19] kbuild: Add gendwarfksyms as an alternative to genksyms

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Message-ID: <CABCJKudWUBE2ZboktcBEykBReor4T1Cf8dfRCWJYEryoT81OEQ@mail.gmail.com>
Date: Wed, 13 Nov 2024 09:48:13 -0800
From: Sami Tolvanen <samitolvanen@...gle.com>
To: Masahiro Yamada <masahiroy@...nel.org>
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>, Gary Guo <gary@...yguo.net>, 
	Petr Pavlu <petr.pavlu@...e.com>, Daniel Gomez <da.gomez@...sung.com>, Neal Gompa <neal@...pa.dev>, 
	Hector Martin <marcan@...can.st>, Janne Grunau <j@...nau.net>, Miroslav Benes <mbenes@...e.cz>, 
	Asahi Linux <asahi@...ts.linux.dev>, Sedat Dilek <sedat.dilek@...il.com>, 
	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-modules@...r.kernel.org, rust-for-linux@...r.kernel.org
Subject: Re: [PATCH v5 18/19] kbuild: Add gendwarfksyms as an alternative to genksyms

Hi Masahiro,

On Mon, Nov 11, 2024 at 8:09 PM Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> On Thu, Oct 31, 2024 at 2:01 AM Sami Tolvanen <samitolvanen@...gle.com> wrote:
> >
> >  # These mirror gensymtypes_c and co above, keep them in synch.
> > -cmd_gensymtypes_S =                                                         \
> > -   { echo "\#include <linux/kernel.h>" ;                                    \
> > -     echo "\#include <asm/asm-prototypes.h>" ;                              \
> > -     $(NM) $@ | sed -n 's/.* __export_symbol_\(.*\)/EXPORT_SYMBOL(\1);/p' ; } | \
> > -    $(CPP) -D__GENKSYMS__ $(c_flags) -xc - | $(genksyms)
> > +getasmexports =                                                                \
> > +   { echo "\#include <linux/kernel.h>" ;                               \
> > +     echo "\#include <linux/string.h>" ;                               \
> > +     echo "\#include <asm/asm-prototypes.h>" ;                         \
> > +     $(call getexportsymbols,$(2:.symtypes=.o),EXPORT_SYMBOL(\1);) ; }
> > +
> > +ifdef CONFIG_GENDWARFKSYMS
> > +cmd_gensymtypes_S =                                                    \
> > +       $(getasmexports) |                                              \
> > +       $(CC) $(c_flags) -c -o $(2:.symtypes=.gendwarfksyms.o) -xc -;   \
> > +       $(call getexportsymbols,$(2:.symtypes=.o),\1) |                 \
> > +       $(gendwarfksyms) $(2:.symtypes=.gendwarfksyms.o)
>
>
> I do not want to see crazy suffix replacements like this.

Yeah, I agree. It does get a bit ugly.

> I decided to delete this.
> https://lore.kernel.org/linux-kbuild/20241111171753.2917697-2-masahiroy@kernel.org/T/#u

Cool, thanks! I'll rebase v6 on top of your patch.

Sami