linux-kernel - Re: PAGE_ALIGN() compile breakage

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Date:	Fri, 25 Jul 2008 02:34:55 -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 12:27:48 +0300 Adrian Bunk <bunk@...nel.org> wrote:

> Further testing revealed that you should choose a file that also gets 
> compiled on MMU-less architectures:

We don't have one :(

I guess util.c will have to do.

diff -puN include/linux/sched.h~uninline-arch_pick_mmap_layout include/linux/sched.h
--- a/include/linux/sched.h~uninline-arch_pick_mmap_layout
+++ 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/util.c~uninline-arch_pick_mmap_layout mm/util.c
--- a/mm/util.c~uninline-arch_pick_mmap_layout
+++ a/mm/util.c
@@ -1,3 +1,4 @@
+#include <linux/mm.h>
 #include <linux/slab.h>
 #include <linux/string.h>
 #include <linux/module.h>
@@ -160,3 +161,12 @@ char *strndup_user(const char __user *s,
 	return p;
 }
 EXPORT_SYMBOL(strndup_user);
+
+#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
_


We should make arch_pick_mmap_layout __weak and nuke that ifdef.
--
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