linux-kernel - RE: [PATCH 2/2] ACPICA: acpidump: Remove translation protection on integer types.

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Message-ID: <3908561D78D1C84285E8C5FCA982C28F31DC88AC@ORSMSX106.amr.corp.intel.com>
Date:	Thu, 13 Feb 2014 23:34:45 +0000
From:	"Luck, Tony" <tony.luck@...el.com>
To:	"Zheng, Lv" <lv.zheng@...el.com>,
	"Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
	"Brown, Len" <len.brown@...el.com>
CC:	Lv Zheng <zetalog@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"Yu, Fenghua" <fenghua.yu@...el.com>
Subject: RE: [PATCH 2/2] ACPICA: acpidump: Remove translation protection on
 integer types.

>    All definitions are equal except ACPI_UINT64_MAX for CONFIG_IA64.  It
>    is changed from sizeof(unsigned long) to sizeof(unsigned long long).
>    By investigation, 64bit Linux kernel build is LP64 compliant, i.e.,
>    sizeof(long) and (pointer) are 64.  As sizeof(unsigned long) equals to
>    sizeof(unsigned long long) on IA64 platform where CONFIG_64BIT cannot be
>    disabled, this change actually will not affect the value of
>    ACPI_UINT64_MAX on IA64 platforms.

This all looks correct to me - it really shouldn't make any difference
to ia64 whether we use "long" or "long long" ... both are 8-byte entities.
The compiler would complain in some places if you mixed & matched
incorrectly (e.g. printk("val = %ld\n", val); will give a warning if val has
been switched from "long" to "long long" and the format would need
to change to "%lld").  But it looks like nothing like that happens as a
result of this patch. All my ia64 configs build with no new warnings.

Boots OK too.

-Tony
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