linux-kernel - Re: [PATCH] x86, tboot: provide debugfs interfaces to access TXT log

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Date:	Sun, 23 Jun 2013 01:36:13 -0700
From:	Joe Perches <joe@...ches.com>
To:	Qiaowei Ren <qiaowei.ren@...el.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, Gang Wei <gang.wei@...el.com>
Subject: Re: [PATCH] x86, tboot: provide debugfs interfaces to access TXT log

On Sun, 2013-06-23 at 15:54 +0800, Qiaowei Ren wrote:
> These logs come from tboot (Trusted Boot, an open source,
> pre-kernel/VMM module that uses Intel TXT to perform a
> measured and verified launch of an OS kernel/VMM.).
[]
> diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c
[]
> +static struct tboot_log *get_log(void)
> +{
> +	struct tboot_log *log;
> +
> +	log = (struct tboot_log *)ioremap_nocache(TBOOT_SERIAL_LOG_ADDR,
> +						  TBOOT_SERIAL_LOG_SIZE);

You might want to fix the sparse errors.
  CHECK   arch/x86/kernel/tboot.c
arch/x86/kernel/tboot.c:362:16: warning: cast removes address space of expression
arch/x86/kernel/tboot.c:368:25: warning: incorrect type in argument 1 (different address spaces)
arch/x86/kernel/tboot.c:368:25:    expected void volatile [noderef] <asn:2>*addr
arch/x86/kernel/tboot.c:368:25:    got struct tboot_log *[assigned] log
arch/x86/kernel/tboot.c:395:17: warning: incorrect type in argument 1 (different address spaces)
arch/x86/kernel/tboot.c:395:17:    expected void volatile [noderef] <asn:2>*addr
arch/x86/kernel/tboot.c:395:17:    got struct tboot_log *[assigned] log
arch/x86/kernel/tboot.c:479:16: warning: incorrect type in assignment (different address spaces)
arch/x86/kernel/tboot.c:479:16:    expected void *config
arch/x86/kernel/tboot.c:479:16:    got void [noderef] <asn:2>*
arch/x86/kernel/tboot.c:485:19: warning: incorrect type in assignment (different address spaces)
arch/x86/kernel/tboot.c:485:19:    expected void *heap_base
arch/x86/kernel/tboot.c:485:19:    got void [noderef] <asn:2>*
arch/x86/kernel/tboot.c:487:17: warning: incorrect type in argument 1 (different address spaces)
arch/x86/kernel/tboot.c:487:17:    expected void volatile [noderef] <asn:2>*addr
arch/x86/kernel/tboot.c:487:17:    got void *config

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