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Date:   Mon, 7 Oct 2013 18:08:21 +0200
From:   Ralf Baechle <ralf@linux-mips.org>
To:     Ashok Kumar <ashoks@broadcom.com>
Cc:     linux-mips@linux-mips.org, gerg@uclinux.org
Subject: Re: [PATCH] MIPS: fix mapstart when using initrd
Message-ID: <20131007160821.GA1615@linux-mips.org>
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On Mon, Sep 23, 2013 at 07:40:26PM +0530, Ashok Kumar wrote:
> Date:   Mon, 23 Sep 2013 19:40:26 +0530
> From: Ashok Kumar <ashoks@broadcom.com>
> To: linux-mips@linux-mips.org, gerg@uclinux.org
> cc: ralf@linux-mips.org, Ashok Kumar <ashoks@broadcom.com>
> Subject: [PATCH] MIPS: fix mapstart when using initrd
> Content-Type: text/plain
> 
> When initrd is present in the PFN right after the _end, bootmem
> bitmap(mapstart) overwrites it. So check for initrd_end in
> mapstart calculation.
> 
> Signed-off-by: Ashok Kumar <ashoks@broadcom.com>
> ---
> This is seen after the commit
> "mips: fix start of free memory when using initrd"
> in git://git.linux-mips.org/pub/scm/ralf/upstream-sfr.git branch
> 
> Tested the image on MIPS platform creating the above
> said scenario and initrd was corrupted.

And it gloriously breaks the build if CONFIG_BLK_DEV_INITRD is disabled.
Now most configurations will fail with something like:

[...]
  LD      vmlinux
arch/mips/built-in.o: In function `setup_arch':
(.init.text+0xff8): undefined reference to `initrd_end'
arch/mips/built-in.o: In function `setup_arch':
(.init.text+0xffc): undefined reference to `initrd_end'
make[2]: *** [vmlinux] Error 1
make[1]: *** [sub-make] Error 2
make: *** [all] Error 2
make: Leaving directory `/home/ralf/src/linux/obj/lasat-build'

  Ralf