[PATCH -next] fbdev: c2p: Fix link failure on non-inlining

Masahiro Yamada yamada.masahiro at socionext.com
Thu Sep 26 10:45:06 UTC 2019

On Thu, Sep 26, 2019 at 7:13 PM Geert Uytterhoeven <geert at linux-m68k.org> wrote:
> When the compiler decides not to inline the Chunky-to-Planar core
> functions, the build fails with:
>     c2p_planar.c:(.text+0xd6): undefined reference to `c2p_unsupported'
>     c2p_planar.c:(.text+0x1dc): undefined reference to `c2p_unsupported'
>     c2p_iplan2.c:(.text+0xc4): undefined reference to `c2p_unsupported'
>     c2p_iplan2.c:(.text+0x150): undefined reference to `c2p_unsupported'
> Fix this by marking the functions __always_inline.
> Reported-by: noreply at ellerman.id.au
> Signed-off-by: Geert Uytterhoeven <geert at linux-m68k.org>
> ---
> Fixes: 025f072e5823947c ("compiler: enable CONFIG_OPTIMIZE_INLINING forcibly")
> As this is a patch in akpm's tree, the commit ID in the Fixes tag is not
> stable.

BTW, that Fixes tag is incorrect.

Irrespective of 025f072e5823947c, you could manually enable
CONFIG_OPTIMIZE_INLINING from menuconfig etc.

So, this build error would have been found much earlier
if somebody had been running randconfig tests on m68k.

It is impossible to detect this error on other architectures
because the driver config options are guarded by
'depends on ATARI' or 'depends on AMIGA'.

The correct tag is:

Fixes: 9012d011660e ("compiler: allow all arches to enable

The commit id is stable.

As an additional work,
depends on (AMIGA || COMPILE_TEST)
would be nice unless this driver contains m68k-specific code.

Best Regards
Masahiro Yamada

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