[PATCH v2] arm64: defconfig: Use DEBUG_INFO_REDUCED

[Will Deacon]

On Thu, Mar 04, 2021 at 05:44:07PM +0000, Mark Brown wrote:
> We've had DEBUG_INFO enabled for arm64 defconfigs since the initial
> commit.  This is probably not that frequently used but substantially
> inflates the size of the build tree and amount of I/O needed during the
> build.  This was causing issues with storage usage in some automated CI
> environments which don't expect defconfigs to be quite this big, and
> generally increases the resource consumption for both them and people
> doing local builds.  The main use case for the debug info is decoding
> things with scripts/faddr2line but that doesn't need the full
> DEBUG_INFO, DEBUG_INFO_REDUCED is enough for it, so enable that by
> default.
> 
> Without this patch my build tree is 6.8G, with it the size drops to 2G
> (smaller than the 6.4G for allmodconfig!).
> 
> Suggested-by: Catalin Marinas <catalin.marinas at arm.com>
> Reported-by: Guillaume Tucker <guillaume.tucker at collabora.com>
> Signed-off-by: Mark Brown <broonie at kernel.org>
> Acked-by: Kevin Hilman <khilman at baylibre.com>
> ---
>  arch/arm64/configs/defconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
> index d612f633b771..8793a9cb9d4b 100644
> --- a/arch/arm64/configs/defconfig
> +++ b/arch/arm64/configs/defconfig
> @@ -1156,6 +1156,7 @@ CONFIG_CRYPTO_DEV_HISI_TRNG=m
>  CONFIG_CMA_SIZE_MBYTES=32
>  CONFIG_PRINTK_TIME=y
>  CONFIG_DEBUG_INFO=y
> +CONFIG_DEBUG_INFO_REDUCED=y
>  CONFIG_MAGIC_SYSRQ=y
>  CONFIG_DEBUG_FS=y
>  CONFIG_DEBUG_KERNEL=y

I gave this a spin with clang and it looks alright! Are you targetting 5.12
with this or can it wait until 5.13? I can't tell how big a deal it is on
the CI side of things.

Will