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mm: use 'const char *' insted of 'char *' for reason in dump_page() 

I tried to use 'dump_page(page, __func__)' for debugging, but it triggers
warning:

  warning: passing argument 2 of `dump_page' discards `const' qualifier from pointer target type [enabled by default]

Let's convert 'reason' to 'const char *' in dump_page() and friends: we
shouldn't modify it anyway.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kirill A. Shutemov 2014-04-07 15:37:38 -07:00 committed by Linus Torvalds
parent 3643763834
commit d230dec18d
2 changed files with 9 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/linux/mmdebug.h
View File

@ -3,8 +3,8 @@
struct page;
extern void dump_page(struct page *page, char *reason);
extern void dump_page_badflags(struct page *page, char *reason,
extern void dump_page(struct page *page, const char *reason);
extern void dump_page_badflags(struct page *page, const char *reason,
unsigned long badflags);
#ifdef CONFIG_DEBUG_VM

12
mm/page_alloc.c
View File

@ -295,7 +295,8 @@ static inline int bad_range(struct zone *zone, struct page *page)
}
#endif
static void bad_page(struct page *page, char *reason, unsigned long bad_flags)
static void bad_page(struct page *page, const char *reason,
unsigned long bad_flags)
{
static unsigned long resume;
static unsigned long nr_shown;
@ -623,7 +624,7 @@ out:
static inline int free_pages_check(struct page *page)
{
char *bad_reason = NULL;
const char *bad_reason = NULL;
unsigned long bad_flags = 0;
if (unlikely(page_mapcount(page)))
@ -859,7 +860,7 @@ static inline void expand(struct zone *zone, struct page *page,
*/
static inline int check_new_page(struct page *page)
{
char *bad_reason = NULL;
const char *bad_reason = NULL;
unsigned long bad_flags = 0;
if (unlikely(page_mapcount(page)))
@ -6545,7 +6546,8 @@ static void dump_page_flags(unsigned long flags)
printk(")\n");
}
void dump_page_badflags(struct page *page, char *reason, unsigned long badflags)
void dump_page_badflags(struct page *page, const char *reason,
unsigned long badflags)
{
printk(KERN_ALERT
"page:%p count:%d mapcount:%d mapping:%p index:%#lx\n",
@ -6561,7 +6563,7 @@ void dump_page_badflags(struct page *page, char *reason, unsigned long badflags)
mem_cgroup_print_bad_page(page);
}
void dump_page(struct page *page, char *reason)
void dump_page(struct page *page, const char *reason)
{
dump_page_badflags(page, reason, 0);
}