linux-kernel - Re: [PATCH 5.7 0/6] 5.7.14-rc1 review

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Date:   Wed, 5 Aug 2020 11:37:16 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Naresh Kamboju <naresh.kamboju@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Marc Zyngier <maz@...nel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Shuah Khan <shuah@...nel.org>, patches@...nelci.org,
        lkft-triage@...ts.linaro.org,
        Ben Hutchings <ben.hutchings@...ethink.co.uk>,
        linux- stable <stable@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Willy Tarreau <w@....eu>,
        Grygorii Strashko <grygorii.strashko@...com>
Subject: Re: [PATCH 5.7 0/6] 5.7.14-rc1 review

On Wed, Aug 5, 2020 at 11:24 AM Guenter Roeck <linux@...ck-us.net> wrote:
>
> Same with older versions of gcc. I don't see the problem with the
> mainline kernel.

  https://www.youtube.com/watch?v=-b5aW08ivHU

> I think this is caused by more recursive includes.
> arch/arm64/include/asm/archrandom.h includes include/linux/random.h
> which includes arch/arm64/include/asm/archrandom.h to get the definition
> of arch_get_random_seed_long_early (which it won't get because of
> the recursion).
>
> What I don't really understand is how this works with new versions
> of gcc.

Is that the only place it triggers?

Because the trivial fix would be something like the appended, which is
the right thing to do anyway.

              Linus

diff --git a/arch/arm64/kernel/kaslr.c b/arch/arm64/kernel/kaslr.c
index 07c4c8cc4a67..9ded4237e1c1 100644
--- a/arch/arm64/kernel/kaslr.c
+++ b/arch/arm64/kernel/kaslr.c
@@ -11,8 +11,8 @@
 #include <linux/sched.h>
 #include <linux/types.h>
 #include <linux/pgtable.h>
+#include <linux/random.h>

-#include <asm/archrandom.h>
 #include <asm/cacheflush.h>
 #include <asm/fixmap.h>
 #include <asm/kernel-pgtable.h>