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Date:   Tue, 28 Aug 2018 20:44:37 +0200
From:   Krzysztof Kozlowski <krzk@kernel.org>
To:     Michal Kubecek <mkubecek@suse.cz>
Cc:     linux-kernel@vger.kernel.org,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Paul Mackerras <paulus@samba.org>,
        Michael Ellerman <mpe@ellerman.id.au>
Subject: Re: regression: broken ppc64le build with CONFIG_KERNEL_XZ=y
Message-ID: <20180828184437.nyqtlvswlylbpbfj@kozik-lap>
References: <20180827113037.gbtnbhcwebcwei57@unicorn.suse.cz>
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On Mon, Aug 27, 2018 at 01:30:37PM +0200, Michal Kubecek wrote:
> Building 4.19-rc1 kernel with CONFIG_KERNEL_XZ=y fails with this error:
> 
>   BOOTCC  arch/powerpc/boot/decompress.o
> In file included from arch/powerpc/boot/../../../lib/decompress_unxz.c:233,
>                  from arch/powerpc/boot/decompress.c:42:
> arch/powerpc/boot/../../../lib/xz/xz_crc32.c:18:10: fatal error: linux/crc32poly.h: No such file or directory
>  #include <linux/crc32poly.h>
>           ^~~~~~~~~~~~~~~~~~~
> 
> This is caused by commit faa16bc404d7 ("lib: Use existing define with
> polynomial") which added include of <linux/crc32poly.h>; when compiling
> arch/powerpc/boot/decompress.c, the include/ directory is not searched
> so that the header file is not found.
> 
> The solution is probably adding -I directive to some place in
> arch/powerpc/boot/Makefile but I don't dare to guess where.

Hi,

Thanks for letting know. I wonder why kbuild test robot did not catch
this... I just got back from vacation so I will need few days to look
into it.

Best regards,
Krzysztof