linux-kernel - Inline assembly queries [2]

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Message-ID: <abe8a1fd0907022344k2eb9874ejdbda3209a7cadf40@mail.gmail.com>
Date:	Fri, 3 Jul 2009 12:14:41 +0530
From:	kernel mailz <kernelmailz@...glemail.com>
To:	linuxppc-dev@...abs.org, gcc-help@....gnu.org,
	linux-kernel@...r.kernel.org
Subject: Inline assembly queries [2]

Hi,

Thanks for responding to my previous mail. A few more queries

a. What is the use of adding format specifiers in inline assembly
like
asm volatile("ld%U1%X1 %0,%1":"=r"(ret) : "m"(*ptr) : "memory");

b. using m or Z  with a memory address. I tried replacing m/Z but no change
Is there some guideline ?
gcc documentation says Z is obsolete. Is m/Z replaceable ?

- Manish
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