linux-kernel - Re: [PATCH 00/34] _

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Message-Id: <20070209141137.76013fa9.akpm@linux-foundation.org>
Date:	Fri, 9 Feb 2007 14:11:37 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Alon Bar-Lev" <alon.barlev@...il.com>
Cc:	linux-kernel@...r.kernel.org, bwalle@...e.de,
	rmk+lkml@....linux.org.uk
Subject: Re: [PATCH 00/34] __initdata cleanup

On Fri, 9 Feb 2007 23:48:36 +0200
"Alon Bar-Lev" <alon.barlev@...il.com> wrote:

> On 2/9/07, Andrew Morton <akpm@...ux-foundation.org> wrote:
> > If we really do have a problem here it'd be better to fix it in some
> > central and global fashion: either by ensuring that each architecture's
> > startup code will zero this memory or by some compiler/linker option such
> > as -fno-common.
> 
> Great,
> But what about the variables that are not in global scope?
> As I understand from init.h description:
> "Don't forget to initialize data not at file scope, i.e. within a function,
> as gcc otherwise puts the data into the bss section and not into the init
> section."
> 

It could be that this is referring to a toolchain which we don't use any
more.  That comment has been there for at least seven years.

This:

--- a/fs/open.c~a
+++ a/fs/open.c
@@ -223,6 +223,8 @@ static long do_sys_truncate(const char _
 	struct inode * inode;
 	int error;
 
+	static char blobwozzle[100] __initdata;
+
 	error = -EINVAL;
 	if (length < 0)	/* sorry, but loff_t says... */
 		goto out;
_

puts the array in .init.data on my fairly old toolchain.
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