linux-kernel - Re: [PATCH 5/5] lib/nodemask: inline next_node_in() and node

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Message-ID: <CAAH8bW_fRmfNnCo2XZdQxe6_W8KS=bkgv+Jrn8KA_c4rmNVCzw@mail.gmail.com>
Date:   Fri, 29 Jul 2022 09:48:06 -0700
From:   Yury Norov <yury.norov@...il.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     linux-kernel@...r.kernel.org,
        Alexander Lobakin <alexandr.lobakin@...el.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Arnd Bergmann <arnd@...db.de>, David Gow <davidgow@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Isabella Basso <isabbasso@...eup.net>,
        Kees Cook <keescook@...omium.org>,
        Keith Busch <kbusch@...nel.org>,
        Kumar Kartikeya Dwivedi <memxor@...il.com>,
        Marco Elver <elver@...gle.com>,
        Mark Rutland <mark.rutland@....com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Steven Rostedt <rostedt@...dmis.org>,
        Toke Høiland-Jørgensen <toke@...hat.com>
Subject: Re: [PATCH 5/5] lib/nodemask: inline next_node_in() and node_random()

On Thu, Jul 28, 2022 at 8:46 PM Guenter Roeck <linux@...ck-us.net> wrote:
>
> On Sun, Jul 10, 2022 at 09:47:11PM -0700, Yury Norov wrote:
> > The functions are pretty thin wrappers around find_bit engine, and
> > keeping them in c-file prevents compiler from small_const_nbits()
> > optimization, which must take place for all systems with MAX_NUMNODES
> > less than BITS_PER_LONG (default is 16 for me).
> >
> > Moving them in header file doesn't blow up the kernel size:
> > add/remove: 1/2 grow/shrink: 9/5 up/down: 968/-88 (880)
> >
> > Signed-off-by: Yury Norov <yury.norov@...il.com>
>
> This patch results in
>
> Building powerpc:allmodconfig ... failed
> --------------
> Error log:
> In file included from include/linux/nodemask.h:97,
>                  from include/linux/sched.h:22,
>                  from include/linux/sched/mm.h:7,
>                  from arch/powerpc/lib/feature-fixups.c:16:
> include/linux/random.h: In function 'add_latent_entropy':
> include/linux/random.h:25:46: error: 'latent_entropy' undeclared
>
> and many more similar errors when trying to compile ppc:allmodconfig.
>
> Guenter

Hi Guenter,

Thanks for testing. The fix is:

diff --git a/arch/powerpc/kernel/setup-common.c
b/arch/powerpc/kernel/setup-common.c
index eadaddccfe89..18c5fa5918bf 100644
--- a/arch/powerpc/kernel/setup-common.c
+++ b/arch/powerpc/kernel/setup-common.c
@@ -179,6 +179,7 @@ bool __must_check
arch_get_random_seed_long(unsigned long *v)

        return false;
 }
+EXPORT_SYMBOL(arch_get_random_seed_long);
 #endif

I moved this export in and out while discussing the patch, and finally left the
branch in a broken state. Sorry that. Now fixed.

Thanks,
Yury