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authorWu Fengguang <fengguang.wu@intel.com>2010-01-22 16:16:19 +0800
committerH. Peter Anvin <hpa@zytor.com>2010-02-01 16:58:17 -0800
commit61ef2489dbf587258526cfd4ebf4bba3b079f401 (patch)
tree4806ed052c73d84821d958f306699b2a27da965e /include
parentccef086454d4c97e7b722e9303390207d681cb4c (diff)
resources: introduce generic page_is_ram()
It's based on walk_system_ram_range(), for archs that don't have their own page_is_ram(). The static verions in MIPS and SCORE are also made global. v4: prefer plain 1 instead of PAGE_IS_RAM (H. Peter Anvin) v3: add comment (KAMEZAWA Hiroyuki) "AFAIK, this "System RAM" information has been used for kdump to grab valid memory area and seems good for the kernel itself." v2: add PAGE_IS_RAM macro (Américo Wang) Cc: Chen Liqin <liqin.chen@sunplusct.com> Cc: Lennox Wu <lennox.wu@gmail.com> Cc: Américo Wang <xiyou.wangcong@gmail.com> Cc: linux-mips@linux-mips.org Cc: Yinghai Lu <yinghai@kernel.org> Acked-by: Ralf Baechle <ralf@linux-mips.org> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> LKML-Reference: <20100122081619.GA6431@localhost> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'include')
-rw-r--r--include/linux/ioport.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/ioport.h b/include/linux/ioport.h
index 83aa81297ea..11ef7952b63 100644
--- a/include/linux/ioport.h
+++ b/include/linux/ioport.h
@@ -188,5 +188,7 @@ extern int
walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
void *arg, int (*func)(unsigned long, unsigned long, void *));
+extern int page_is_ram(unsigned long pfn);
+
#endif /* __ASSEMBLY__ */
#endif /* _LINUX_IOPORT_H */