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mm: introduce helper function set_max_mapnr()
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Introduce a helper function set_max_mapnr() to set global variable
max_mapnr.

Also unify condition compilation for max_mapnr with
CONFIG_NEED_MULTIPLE_NODES instead of CONFIG_DISCONTIGMEM.

Signed-off-by: Jiang Liu <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Mauro Carvalho Chehab <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: Mark Brown <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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jiangliu authored and torvalds committed Jul 3, 2013
1 parent 1895418 commit fccc998
Showing 1 changed file with 8 additions and 1 deletion.
9 changes: 8 additions & 1 deletion include/linux/mm.h
Original file line number Diff line number Diff line change
Expand Up @@ -25,8 +25,15 @@ struct file_ra_state;
struct user_struct;
struct writeback_control;

#ifndef CONFIG_DISCONTIGMEM /* Don't use mapnrs, do it properly */
#ifndef CONFIG_NEED_MULTIPLE_NODES /* Don't use mapnrs, do it properly */
extern unsigned long max_mapnr;

static inline void set_max_mapnr(unsigned long limit)
{
max_mapnr = limit;
}
#else
static inline void set_max_mapnr(unsigned long limit) { }
#endif

extern unsigned long totalram_pages;
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