linux-kernel - Re: [PATCH] xfs: stop CONFIG_XFS_DEBUG from changing compiler flags

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Date:   Thu, 9 Apr 2020 08:50:47 -0700
From:   Allison Collins <allison.henderson@...cle.com>
To:     Arnd Bergmann <arnd@...db.de>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        linux-xfs@...r.kernel.org
Cc:     Christoph Hellwig <hch@...radead.org>,
        Brian Foster <bfoster@...hat.com>,
        Dave Chinner <dchinner@...hat.com>,
        Eric Sandeen <sandeen@...hat.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] xfs: stop CONFIG_XFS_DEBUG from changing compiler flags



On 4/9/20 1:08 AM, Arnd Bergmann wrote:
> I ran into a linker warning in XFS that originates from a mismatch
> between libelf, binutils and objtool when certain files in the kernel
> are built with "gcc -g":
> 
> x86_64-linux-ld: fs/xfs/xfs_trace.o: unable to initialize decompress status for section .debug_info
> 
> After some discussion, nobody could identify why xfs sets this flag
> here. CONFIG_XFS_DEBUG used to enable lots of unrelated settings, but
> now its main purpose is to enable extra consistency checks and assertions
> that are unrelated to the debug info.
> 
> Remove the Makefile logic to set the flag here. If anyone relies
> on the debug info, this can simply be enabled again with the global
> CONFIG_DEBUG_INFO option.
> 
> Suggested-by: Christoph Hellwig <hch@...radead.org>
> Link: https://urldefense.com/v3/__https://lore.kernel.org/lkml/20200409074130.GD21033@infradead.org/__;!!GqivPVa7Brio!JzJUQORI8aWjYFMvoyVmkgYSofJexLQn7p16KvP39F-NjuIzEXWqypgw0FnCyrdFtmZm$
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Ok, looks good
Reviewed-by: Allison Collins <allison.henderson@...cle.com>

> ---
>   fs/xfs/Makefile | 2 --
>   1 file changed, 2 deletions(-)
> 
> diff --git a/fs/xfs/Makefile b/fs/xfs/Makefile
> index 4f95df476181..ff94fb90a2ee 100644
> --- a/fs/xfs/Makefile
> +++ b/fs/xfs/Makefile
> @@ -7,8 +7,6 @@
>   ccflags-y += -I $(srctree)/$(src)		# needed for trace events
>   ccflags-y += -I $(srctree)/$(src)/libxfs
>   
> -ccflags-$(CONFIG_XFS_DEBUG) += -g
> -
>   obj-$(CONFIG_XFS_FS)		+= xfs.o
>   
>   # this one should be compiled first, as the tracing macros can easily blow up
>