mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 17:08:10 +00:00
db78c22230
The pfn_t type uses an unsigned long to store a pfn + flags value. On a
64-bit platform the upper 12 bits of an unsigned long are never used for
storing the value of a pfn. However, this is not true on highmem
platforms, all 32-bits of a pfn value are used to address a 44-bit
physical address space. A pfn_t needs to store a 64-bit value.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=112211
Fixes: 01c8f1c44b ("mm, dax, gpu: convert vm_insert_mixed to pfn_t")
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Reported-by: Stuart Foster <smf.linux@ntlworld.com>
Reported-by: Julian Margetson <runaway@candw.ms>
Tested-by: Julian Margetson <runaway@candw.ms>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
23 lines
627 B
C
23 lines
627 B
C
#ifndef _LINUX_PFN_H_
|
|
#define _LINUX_PFN_H_
|
|
|
|
#ifndef __ASSEMBLY__
|
|
#include <linux/types.h>
|
|
|
|
/*
|
|
* pfn_t: encapsulates a page-frame number that is optionally backed
|
|
* by memmap (struct page). Whether a pfn_t has a 'struct page'
|
|
* backing is indicated by flags in the high bits of the value.
|
|
*/
|
|
typedef struct {
|
|
u64 val;
|
|
} pfn_t;
|
|
#endif
|
|
|
|
#define PFN_ALIGN(x) (((unsigned long)(x) + (PAGE_SIZE - 1)) & PAGE_MASK)
|
|
#define PFN_UP(x) (((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
|
|
#define PFN_DOWN(x) ((x) >> PAGE_SHIFT)
|
|
#define PFN_PHYS(x) ((phys_addr_t)(x) << PAGE_SHIFT)
|
|
#define PHYS_PFN(x) ((unsigned long)((x) >> PAGE_SHIFT))
|
|
|
|
#endif
|