linux-kernel - Re: [PATCH] initramfs: Fix spurious rebuilds

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Date:   Wed, 4 Jan 2017 14:34:16 +0100
From:   klondike <klondike@...ndike.es>
To:     Florian Fainelli <f.fainelli@...il.com>,
        linux-kernel@...r.kernel.org
Cc:     torvalds@...ux-foundation.org, pebolle@...cali.nl,
        ppandit@...hat.com, mmarek@...e.cz,
        Andrew Morton <akpm@...ux-foundation.org>, npiggin@...il.com
Subject: Re: [PATCH] initramfs: Fix spurious rebuilds

El 04/01/17 a las 02:37, Florian Fainelli escribió:
> Commit 35e669e1a254 ("initramfs: select builtin initram
> compression algorithm on KConfig instead of Makefile") makes suffix_y be
> a quote variable, which can be illustrated looking at the build output:
>
>   GEN     usr/initramfs_data.cpio".gz"
>
> Make sure that we do strip off double quotes from
> CONFIG_INITRAMFS_COMPRESSION, since the Makefile tracks targets with
> unquoted suffixes.
>
> Fixes: 35e669e1a254 ("initramfs: select builtin initram compression algorithm on KConfig instead of Makefile")
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> ---
> This is against v4.10-rc2, thanks!
>
>  usr/Makefile | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/usr/Makefile b/usr/Makefile
> index 17a513268325..a9ae8b493e2b 100644
> --- a/usr/Makefile
> +++ b/usr/Makefile
> @@ -5,7 +5,7 @@
>  klibcdirs:;
>  PHONY += klibcdirs
>  
> -suffix_y = $(CONFIG_INITRAMFS_COMPRESSION)
> +suffix_y = $(subst ",,$(CONFIG_INITRAMFS_COMPRESSION))
>  AFLAGS_initramfs_data.o += -DINITRAMFS_IMAGE="usr/initramfs_data.cpio$(suffix_y)"
>  
>  # Generate builtin.o based on initramfs_data.o

Hello,

Thanks for the fix, when I tested the patch I checked that the correct
file was created and embedded but didn't check for spurious rebuilds.

I'm CCing Nicholas Piggin as he sent another (larger version) of the
patch which also addresses a few other hacks in the Makefile, see
"[PATCH] kbuild: Fix dependency checking for initramfs build". I haven't
had time to check that second patch.

I have run the tests I ran for my own patches and they all passed, so 
feel free to add Reviewed-by and Tested-by if you want :)

Sincerely,
Francisco Blas Izquierdo Riera (klondike)




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