Eric Lee / linux-smarc-t335x-v3.2

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Commit 61ef2489dbf587258526cfd4ebf4bba3b079f401

Authored by Wu Fengguang
Committed by H. Peter Anvin
1 parent ccef086454
Exists in master and in 4 other branches v3.2_AM335xPSP_04.06.00.11, v3.2_NEWT335xPSP_04.06.00.11, v3.2_SBC_SMARTMEN, v3.2_SMARCT335xPSP_04.06.00.11

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>

Showing 4 changed files with 17 additions and 2 deletions Side-by-side Diff

... ... @@ -294,7 +294,7 @@
294 294 }
295 295  
296 296 #ifndef CONFIG_NEED_MULTIPLE_NODES
297   -static int __init page_is_ram(unsigned long pagenr)
  297 +int page_is_ram(unsigned long pagenr)
298 298 {
299 299 int i;
300 300  
arch/score/mm/init.c
Diff comments   View file @ 61ef248
... ... @@ -59,7 +59,7 @@
59 59 }
60 60  
61 61 #ifndef CONFIG_NEED_MULTIPLE_NODES
62   -static int __init page_is_ram(unsigned long pagenr)
  62 +int page_is_ram(unsigned long pagenr)
63 63 {
64 64 if (pagenr >= min_low_pfn && pagenr < max_low_pfn)
65 65 return 1;
include/linux/ioport.h
Diff comments   View file @ 61ef248
... ... @@ -188,6 +188,8 @@
188 188 walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
189 189 void *arg, int (*func)(unsigned long, unsigned long, void *));
190 190  
  191 +extern int page_is_ram(unsigned long pfn);
  192 +
191 193 #endif /* __ASSEMBLY__ */
192 194 #endif /* _LINUX_IOPORT_H */
... ... @@ -297,6 +297,19 @@
297 297  
298 298 #endif
299 299  
  300 +static int __is_ram(unsigned long pfn, unsigned long nr_pages, void *arg)
  301 +{
  302 + return 1;
  303 +}
  304 +/*
  305 + * This generic page_is_ram() returns true if specified address is
  306 + * registered as "System RAM" in iomem_resource list.
  307 + */
  308 +int __attribute__((weak)) page_is_ram(unsigned long pfn)
  309 +{
  310 + return walk_system_ram_range(pfn, 1, NULL, __is_ram) == 1;
  311 +}
  312 +
300 313 /*
301 314 * Find empty slot in the resource tree given range and alignment.
302 315 */