Messages in this thread Patch in this message | | | Date | Tue, 11 Nov 2008 16:24:27 -0800 | From | Greg KH <> | Subject | [patch 44/49] Fix __pfn_to_page(pfn) for CONFIG_DISCONTIGMEM=y |
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2.6.27-stable review patch. If anyone has any objections, please let us know.
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From: Rafael J. Wysocki <rjw@sisk.pl>
commit c5d712433ff57a66d8fb79a57a4fc7a7c3467b97 upstream
Fix the __pfn_to_page(pfn) macro so that it doesn't evaluate its argument twice in the CONFIG_DISCONTIGMEM=y case, because 'pfn' may be a result of a funtion call having side effects.
For example, the hibernation code applies pfn_to_page(pfn) to the result of a function returning the pfn corresponding to the next set bit in a bitmap and the current bit position is modified on each call. This leads to "interesting" failures for CONFIG_DISCONTIGMEM=y due to the current behavior of __pfn_to_page(pfn).
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Pavel Machek <pavel@suse.cz> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- include/asm-generic/memory_model.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/include/asm-generic/memory_model.h +++ b/include/asm-generic/memory_model.h @@ -34,7 +34,7 @@ #define __pfn_to_page(pfn) \ ({ unsigned long __pfn = (pfn); \ - unsigned long __nid = arch_pfn_to_nid(pfn); \ + unsigned long __nid = arch_pfn_to_nid(__pfn); \ NODE_DATA(__nid)->node_mem_map + arch_local_page_offset(__pfn, __nid);\ }) --
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