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Message-ID: <CAMo8BfJOPNaHb0f3Rf2GyhApCDg5bFfCGETWU9-LBJWiJpLeFw@mail.gmail.com>
Date: Fri, 23 Aug 2024 23:41:17 -0700
From: Max Filippov <jcmvbkbc@...il.com>
To: Przemek Kitszel <przemyslaw.kitszel@...el.com>
Cc: kernel test robot <lkp@...el.com>, oe-kbuild-all@...ts.linux.dev,
linux-kernel@...r.kernel.org, Pawel Chmielewski <pawel.chmielewski@...el.com>,
Jacob Keller <jacob.e.keller@...el.com>, Paul Greenwalt <paul.greenwalt@...el.com>,
Simon Horman <horms@...nel.org>, Tony Nguyen <anthony.l.nguyen@...el.com>
Subject: Re: WARNING: [xtensa] modpost: vmlinux: section mismatch in
reference: ice_adv_lnk_speed_maps+0x14 (section: .data) ->
__setup_str_initcall_blacklist (section: .init.rodata)
Hi Przemek,
On Thu, Aug 22, 2024 at 1:23 AM Przemek Kitszel
<przemyslaw.kitszel@...el.com> wrote:
> > WARNING: modpost: missing MODULE_DESCRIPTION() in vmlinux.o
> > WARNING: modpost: vmlinux: section mismatch in reference: put_page+0x78 (section: .text.unlikely) -> initcall_level_names (section: .init.data)
> >>> WARNING: modpost: vmlinux: section mismatch in reference: ice_adv_lnk_speed_maps+0x14 (section: .data) -> __setup_str_initcall_blacklist (section: .init.rodata)
>
> I have spent just half of hour on that and I'm clueless.
>
> For reference, the driver code is:
> static const u32 arr_name[] __initconst = {
> SOME_CONST,
> };
> and core kernel has:
> #define __initconst __section(.init.rodata)
>
>
> @Max Filippov, you have authored much of xtensa arch for kernel,
> especially XIP support, and touched .init.rodata back then;
> perhaps you have any idea what is going here?
I see the following:
static struct ethtool_forced_speed_map ice_adv_lnk_speed_maps[]
__ro_after_init = {
ETHTOOL_FORCED_SPEED_MAP(ice_adv_lnk_speed, 100),
that array goes into the .data, but ETHTOOL_FORCED_SPEED_MAP
expands to the following:
#define ETHTOOL_FORCED_SPEED_MAP(prefix, value) \
{ \
.speed = SPEED_##value, \
.cap_arr = prefix##_##value, \
.arr_size = ARRAY_SIZE(prefix##_##value), \
}
so the first entry of that array quoted above above gets the following
initializer:
.cap_arr = ice_adv_lnk_speed_100,
and ice_adv_lnk_speed_100 is defined as
static const u32 ice_adv_lnk_speed_100[] __initconst = {
so this array goes into .init.rodata.
That's a reference from .data to .init.rodata that upsets the modpost checker.
I see that modpost incorrectly deduces where this link points (it's
ice_adv_lnk_speed_*, not __setup_str_initcall_blacklist).
I also see that this link is not used after the init phase, so it's harmless.
--
Thanks.
-- Max
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