linux-kernel - Re: PAGE_ALIGN() compile breakage

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Date:	Fri, 25 Jul 2008 01:55:37 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Adrian Bunk <bunk@...nel.org>
Cc:	Andrea Righi <righi.andrea@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: PAGE_ALIGN() compile breakage

On Fri, 25 Jul 2008 11:39:43 +0300 Adrian Bunk <bunk@...nel.org> wrote:

> Commit 27ac792ca0b0a1e7e65f20342260650516c95864
> (PAGE_ALIGN(): correctly handle 64-bit values on 32-bit architectures)
> causes on some architectures (e.g. avr32 and mips) compile errors
> like the following in some configurations starting with:
> 
> <--  snip  -->
> 
> ...
>   CC      init/main.o
> In file included from 
> /home/bunk/linux/kernel-2.6/git/linux-2.6/include/linux/utsname.h:35,
>                  from /home/bunk/linux/kernel-2.6/git/linux-2.6/init/main.c:20:
> /home/bunk/linux/kernel-2.6/git/linux-2.6/include/linux/sched.h: In function 'arch_pick_mmap_layout':
> /home/bunk/linux/kernel-2.6/git/linux-2.6/include/linux/sched.h:2149: error: implicit declaration of function 'PAGE_ALIGN'
> make[2]: *** [init/main.o] Error 1
> 

pls test:

diff -puN include/linux/sched.h~a include/linux/sched.h
--- a/include/linux/sched.h~a
+++ a/include/linux/sched.h
@@ -2139,16 +2139,7 @@ static inline void set_task_cpu(struct t
 
 #endif /* CONFIG_SMP */
 
-#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 extern void arch_pick_mmap_layout(struct mm_struct *mm);
-#else
-static inline void arch_pick_mmap_layout(struct mm_struct *mm)
-{
-	mm->mmap_base = TASK_UNMAPPED_BASE;
-	mm->get_unmapped_area = arch_get_unmapped_area;
-	mm->unmap_area = arch_unmap_area;
-}
-#endif
 
 #ifdef CONFIG_TRACING
 extern void
diff -puN mm/mmap.c~a mm/mmap.c
--- a/mm/mmap.c~a
+++ a/mm/mmap.c
@@ -2268,3 +2268,12 @@ int install_special_mapping(struct mm_st
 
 	return 0;
 }
+
+#ifndef HAVE_ARCH_PICK_MMAP_LAYOUT
+void arch_pick_mmap_layout(struct mm_struct *mm)
+{
+	mm->mmap_base = TASK_UNMAPPED_BASE;
+	mm->get_unmapped_area = arch_get_unmapped_area;
+	mm->unmap_area = arch_unmap_area;
+}
+#endif
_

> 
> and more nasty problems follow later.
> 
> My suggestion is to:
> - revert commit 27ac792ca0b0a1e7e65f20342260650516c95864 and then
> - fix all PAGE_ALIGN() instances without moving them.

Every time this patch blew up (and it did it often), fixing it resulted
in overall improvements.

> Unifying code is a good thing, but in this case it is not worth the 
> trouble it causes by poking into the heart of our headers mess.

Well.   If we leave it a mess, it'll stay a mess.
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