linux-kernel - Re: [PATCH -next] buildid: fix build when CONFIG

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Date:   Fri, 14 May 2021 01:54:36 -0500
From:   Stephen Boyd <swboyd@...omium.org>
To:     Randy Dunlap <rdunlap@...radead.org>, linux-kernel@...r.kernel.org
Cc:     Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH -next] buildid: fix build when CONFIG_MODULES is not set

Quoting Randy Dunlap (2021-05-13 10:15:10)
> Omit the static_assert() when CONFIG_MODULES is not set/enabled.
> Fixes these build errors:
>
> ../kernel/kallsyms.c: In function ‘__sprint_symbol’:
> ../include/linux/kernel.h:53:43: error: dereferencing pointer to incomplete type ‘struct module’
>  #define typeof_member(T, m) typeof(((T*)0)->m)
>                                            ^
> ../include/linux/build_bug.h:78:41: error: static assertion failed: "sizeof(typeof_member(struct module, build_id)) == 20"
>  #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
>                                          ^
> ../kernel/kallsyms.c:454:4: note: in expansion of macro ‘static_assert’
>     static_assert(sizeof(typeof_member(struct module, build_id)) == 20);
>     ^~~~~~~~~~~~~
>
> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
> Cc: Stephen Boyd <swboyd@...omium.org>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> ---

Reviewed-by: Stephen Boyd <swboyd@...omium.org>

Thanks. I didn't realize that there was an ifdef around the definition
of 'struct module'.