tree 35e98dc51e781bb24ef6a9bb7911d0cabef4c177
parent fed4d59b6ec5481caceb17863f19a0b0e5eaa939
author Rafael J. Wysocki <rjw@sisk.pl> 1226148813 +0100
committer Linus Torvalds <torvalds@linux-foundation.org> 1226167368 -0800

Fix __pfn_to_page(pfn) for CONFIG_DISCONTIGMEM=y

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>