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| author | KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> | 2009-09-22 16:45:46 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-09-23 07:39:41 -0700 |
| commit | 908eedc6168bd92e89f90d89fa389065a36358fa (patch) | |
| tree | 612881abb2aae920ab1e62e88990ee7b6a988f51 /include/linux/ioport.h | |
| parent | 9492587cf35d370db33ef4b38375dfb35a105b61 (diff) | |
| download | blackbird-op-linux-908eedc6168bd92e89f90d89fa389065a36358fa.tar.gz blackbird-op-linux-908eedc6168bd92e89f90d89fa389065a36358fa.zip | |
walk system ram range
Originally, walk_memory_resource() was introduced to traverse all memory
of "System RAM" for detecting memory hotplug/unplug range. For doing so,
flags of IORESOUCE_MEM|IORESOURCE_BUSY was used and this was enough for
memory hotplug.
But for using other purpose, /proc/kcore, this may includes some firmware
area marked as IORESOURCE_BUSY | IORESOUCE_MEM. This patch makes the
check strict to find out busy "System RAM".
Note: PPC64 keeps their own walk_memory_resouce(), which walk through
ppc64's lmb informaton. Because old kclist_add() is called per lmb, this
patch makes no difference in behavior, finally.
And this patch removes CONFIG_MEMORY_HOTPLUG check from this function.
Because pfn_valid() just show "there is memmap or not* and cannot be used
for "there is physical memory or not", this function is useful in generic
to scan physical memory range.
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: WANG Cong <xiyou.wangcong@gmail.com>
Cc: Américo Wang <xiyou.wangcong@gmail.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Roland Dreier <rolandd@cisco.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/ioport.h')
| -rw-r--r-- | include/linux/ioport.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/ioport.h b/include/linux/ioport.h index 786e7b8cece9..83aa81297ea3 100644 --- a/include/linux/ioport.h +++ b/include/linux/ioport.h @@ -184,5 +184,9 @@ extern void __devm_release_region(struct device *dev, struct resource *parent, extern int iomem_map_sanity_check(resource_size_t addr, unsigned long size); extern int iomem_is_exclusive(u64 addr); +extern int +walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages, + void *arg, int (*func)(unsigned long, unsigned long, void *)); + #endif /* __ASSEMBLY__ */ #endif /* _LINUX_IOPORT_H */ |
