linux-kernel - Re: Many warnings from our userspace headers

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Date:	Tue, 30 Dec 2008 13:07:25 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Andreas Schwab <schwab@...e.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	linux-kbuild <linux-kbuild@...r.kernel.org>,
	janitors <kernel-janitors@...r.kernel.org>,
	David Woodhouse <dwmw2@...radead.org>
Subject: Re: Many warnings from our userspace headers

On Tue, Dec 30, 2008 at 11:43:22AM +0100, Andreas Schwab wrote:
> Sam Ravnborg <sam@...nborg.org> writes:
> 
> > /home/sam/kernel/knext.git/usr/include/linux/acct.h:62: leaks CONFIG_M68K to userspace where it is not valid
> 
> IMHO this is a false positive, since it is protected by __KERNEL__ in
> the same expression.

Correct - but we can rewrite it like this:

diff --git a/include/linux/acct.h b/include/linux/acct.h
index 882dc72..bcc6d2f 100644
--- a/include/linux/acct.h
+++ b/include/linux/acct.h
@@ -59,8 +59,12 @@ struct acct
 	comp_t		ac_majflt;		/* Major Pagefaults */
 	comp_t		ac_swaps;		/* Number of Swaps */
 /* m68k had no padding here. */
-#if !defined(CONFIG_M68K) || !defined(__KERNEL__)
+#ifndef __KERNEL__
 	__u16		ac_ahz;			/* AHZ */
+#else
+  #ifndef CONFIG_M68K
+	__u16		ac_ahz;			/* AHZ */
+  #endif
 #endif
 	__u32		ac_exitcode;		/* Exitcode */
 	char		ac_comm[ACCT_COMM + 1];	/* Command Name */

This is at least for me also easier to parse.
So we remove a (bogus) warning and make the code easier to read.

	Sam
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