linux-kernel - Re: [PATCH 37/46] Compiler attributes, lto: disable _

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Date:   Mon, 14 Nov 2022 18:01:10 +0100
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     "Jiri Slaby (SUSE)" <jirislaby@...nel.org>
Cc:     linux-kernel@...r.kernel.org, Andi Kleen <andi@...stfloor.org>,
        Miguel Ojeda <ojeda@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Martin Liska <mliska@...e.cz>, Jiri Slaby <jslaby@...e.cz>
Subject: Re: [PATCH 37/46] Compiler attributes, lto: disable __flatten with LTO

On Mon, Nov 14, 2022 at 12:45 PM Jiri Slaby (SUSE) <jirislaby@...nel.org> wrote:
>
> +#ifndef CONFIG_LTO_GCC
>  # define __flatten                     __attribute__((flatten))
> +#else
> +/* Causes very large memory use with gcc in LTO mode */
> +# define __flatten
> +#endif

Currently, this header avoids attributes that depend on configuration
options on purpose (see the comment at the top), so it would be best
to move it elsewhere, e.g. `compiler_types.h`.

Though I feel bad about having to move this attribute out since it is
just that config option compared to other more involved bits in
`compiler_types.h`... :(

Cheers,
Miguel