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From: David Howells <dhowells@redhat.com>
In-Reply-To: <20080218140704.4e0d6dba@crazy>
References: <20080218140704.4e0d6dba@crazy> <200802152010.m1FKANcT021529@imap1.linux-foundation.org> <20080215203103.GA22118@flint.arm.linux.org.uk>
To: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: dhowells@redhat.com, Russell King <rmk@arm.linux.org.uk>,
       akpm@linux-foundation.org, mm-commits@vger.kernel.org, hpa@zytor.com,
       ink@jurassic.park.msu.ru, kkojima@rr.iij4u.or.jp, lethal@linux-sh.org,
       mingo@elte.hu, mpm@selenic.com, rc@rc0.org.uk, rth@twiddle.net,
       starvik@axis.com, takata@linux-m32r.org, tglx@linutronix.de,
       ysato@users.sourceforge.jp, Byron Bradley <byron.bbradley@gmail.com>,
       linux-kernel@vger.kernel.org, michael@free-electrons.com
Subject: Re: + inflate-refactor-inflate-malloc-code.patch added to -mm tree
Date: Wed, 12 Mar 2008 14:47:31 +0000
Message-ID: <13565.1205333251@redhat.com>
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1867
Lines: 43

Thomas Petazzoni <thomas.petazzoni@free-electrons.com> wrote:

> inflate: refactor inflate malloc code
> 
> Inflate requires some dynamic memory allocation very early in the boot
> process and this is provided with a set of four functions:
> malloc/free/gzip_mark/gzip_release.
> 
> The old inflate code used a mark/release strategy rather than
> implement free. This new version instead keeps a count on the number
> of outstanding allocations and when it hits zero, it resets the malloc
> arena.
> 
> This allows removing all the mark and release implementations and
> unifying all the malloc/free implementations.
> 
> The architecture-dependent code must define two addresses:
>  - free_mem_ptr, the address of the beginning of the area in which
>    allocations should be made
>  - free_mem_end_ptr, the address of the end of the area in which
>    allocations should be made. If set to 0, then no check is made on
>    the number of allocations, it just grows as much as needed
> 
> The architecture-dependent code can also provide an arch_decomp_wdog()
> function call. This function will be called several times during the
> decompression process, and allow to notify the watchdog that the
> system is still running. If an architecture provides such a call, then
> it must define ARCH_HAS_DECOMP_WDOG so that the generic inflate code
> calls arch_decomp_wdog().
> 
> Work initially done by Matt Mackall <mpm@selenic.com>, updated to a
> recent version of the kernel by me.
> 
> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

Works on MN10300.

Acked-by: David Howells <dhowells@redhat.com>
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