linux-kernel - Re: [memcg:since-3.12 75/75] fs/proc/meminfo.c:undefined reference to `vm_commit

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Date:	Thu, 7 Nov 2013 12:51:03 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	Jerome Marchand <jmarchan@...hat.com>, kbuild-all@...org,
	linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>,
	fengguang.wu@...el.com
Subject: Re: [memcg:since-3.12 75/75] fs/proc/meminfo.c:undefined reference
 to `vm_commit_limit'

On Thu, 7 Nov 2013 14:25:05 +0100 Michal Hocko <mhocko@...e.cz> wrote:

> On Thu 07-11-13 19:08:16, Wu Fengguang wrote:
> > tree:   git://git.kernel.org/pub/scm/linux/kernel/git/mhocko/mm.git since-3.12
> > head:   2f11d7af8df66cb4f217b6293ad8189aa101d601
> > commit: 2f11d7af8df66cb4f217b6293ad8189aa101d601 [75/75] mm-factor-commit-limit-calculation-fix
> > config: make ARCH=blackfin BF526-EZBRD_defconfig
> > 
> > All error/warnings:
> > 
> >    mm/built-in.o: In function `__vm_enough_memory':
> >    (.text+0x11b4c): undefined reference to `vm_commit_limit'
> >    fs/built-in.o: In function `meminfo_proc_show':
> > >> fs/proc/meminfo.c:(.text+0x37ef0): undefined reference to `vm_commit_limit'
> 
> Andrew, it seems that moving vm_commit_limit out of mman.h is not that
> easy because it breaks NOMMU configurations. mm/mmap.o is not part of
> the nommu build apparently.
> 
> So either we move it back to mman.h or put it somewhere else. I do not
> have a good idea where, though.
> 

util.c?

diff -puN mm/mmap.c~mm-factor-commit-limit-calculation-fix-fix mm/mmap.c
--- a/mm/mmap.c~mm-factor-commit-limit-calculation-fix-fix
+++ a/mm/mmap.c
@@ -110,15 +110,6 @@ unsigned long vm_memory_committed(void)
 EXPORT_SYMBOL_GPL(vm_memory_committed);
 
 /*
- * Commited memory limit enforced when OVERCOMMIT_NEVER policy is used
- */
-unsigned long vm_commit_limit(void)
-{
-	return ((totalram_pages - hugetlb_total_pages())
-		* sysctl_overcommit_ratio / 100) + total_swap_pages;
-}
-
-/*
  * Check that a process has enough memory to allocate a new virtual
  * mapping. 0 means there is enough memory for the allocation to
  * succeed and -ENOMEM implies there is not.
--- a/mm/util.c~mm-factor-commit-limit-calculation-fix-fix
+++ a/mm/util.c
@@ -7,6 +7,9 @@
 #include <linux/security.h>
 #include <linux/swap.h>
 #include <linux/swapops.h>
+#include <linux/mman.h>
+#include <linux/hugetlb.h>
+
 #include <asm/uaccess.h>
 
 #include "internal.h"
@@ -398,6 +401,16 @@ struct address_space *page_mapping(struc
 	return mapping;
 }
 
+/*
+ * Commited memory limit enforced when OVERCOMMIT_NEVER policy is used
+ */
+unsigned long vm_commit_limit(void)
+{
+	return ((totalram_pages - hugetlb_total_pages())
+		* sysctl_overcommit_ratio / 100) + total_swap_pages;
+}
+
+
 /* Tracepoints definitions. */
 EXPORT_TRACEPOINT_SYMBOL(kmalloc);
 EXPORT_TRACEPOINT_SYMBOL(kmem_cache_alloc);
_

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