linux-kernel - Re: [PATCH 03/21] ARM: shmobile: don't call irqchip

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 29 Apr 2013 14:58:16 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Bastian Hecht <hechtb@...il.com>
Cc:	Simon Horman <horms@...ge.net.au>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	linux-kernel@...r.kernel.org,
	Bastian Hecht <hechtb+renesas@...il.com>,
	Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
Subject: Re: [PATCH 03/21] ARM: shmobile: don't call irqchip_init unconditionallyA

On Friday 26 April 2013, Bastian Hecht wrote:
> > This one seems broken as the armadillo800eva board currently uses
> > it to initialise GIC even if CONFIG_ATAGS is not defined.
> >
> > I did test the above change on the armadillo800eva board
> > with the above change and CONFIG_ATAGS disabled, the result was
> > a boot failure. With the change reverted booting seems fine.
> 
> CONFIG_ATAGS and CONFIG_ARM_APPENDED_DTB are two ways to pass the
> device tree information, right?

No, the two are methods alternative methods for booting from a legacy
boot loader. CONFIG_ATAGS is the old boot method without a DT, using
a board file and a MACHINE_START() macro. ARM_APPENDED_DTB means you
have a DT linked into the kernel but pass ATAGS to the kernel which
uses the passed data to modify the DT.

> So we run into trouble when we use the later but disable the first.
> Is there a reason why you wanted to avoid using two times just "if
> (!IS_ENABLED(CONFIG_OF))", Arnd?

I incorrectly assumed that the second one was only used without DT,
since it uses hardcoded MMIO locations rather than using of_iomap().

	Arnd
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/