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nommu: fix build breakage 

Commit 34e55232e5 ("mm: avoid false sharing
of mm_counter") added sync_mm_rss() for syncing loosely accounted rss
counters.  It's for CONFIG_MMU but sync_mm_rss is called even in NOMMU
enviroment (kerne/exit.c, fs/exec.c).  Above commit doesn't handle it
well.

This patch changes
  SPLIT_RSS_COUNTING depends on SPLIT_PTLOCKS && CONFIG_MMU

And for avoid unnecessary function calls, sync_mm_rss changed to be inlined
noop function in header file.

Reported-by: David Howells <dhowells@redhat.com>
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Michal Simek <monstr@monstr.eu>
Signed-off-by: David Howells <dhowells@redhat.com>
Cc: Greg Ungerer <gerg@snapgear.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
KAMEZAWA Hiroyuki 2010-03-10 15:20:38 -08:00 committed by Linus Torvalds
parent 936ed49a54
commit 53bddb4e9f
3 changed files with 7 additions and 4 deletions
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6
include/linux/mm.h
View File

@ -971,7 +971,13 @@ static inline void setmax_mm_hiwater_rss(unsigned long *maxrss,
*maxrss = hiwater_rss;
}
#if defined(SPLIT_RSS_COUNTING)
void sync_mm_rss(struct task_struct *task, struct mm_struct *mm);
#else
static inline void sync_mm_rss(struct task_struct *task, struct mm_struct *mm)
{
}
#endif
/*
* A callback you can register to apply pressure to ageable caches.

2
include/linux/mm_types.h
View File

@ -203,7 +203,7 @@ enum {
NR_MM_COUNTERS
};
#if USE_SPLIT_PTLOCKS
#if USE_SPLIT_PTLOCKS && defined(CONFIG_MMU)
#define SPLIT_RSS_COUNTING
struct mm_rss_stat {
atomic_long_t count[NR_MM_COUNTERS];

3
mm/memory.c
View File

@ -190,9 +190,6 @@ static void check_sync_rss_stat(struct task_struct *task)
{
}
void sync_mm_rss(struct task_struct *task, struct mm_struct *mm)
{
}
#endif
/*