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authorDan Williams <dan.j.williams@intel.com>2016-02-11 16:13:17 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-02-11 18:35:48 -0800
commitdb78c22230d0bcc8b27b81f05b39f104f08232c5 (patch)
treed5c99cc8df77b86bd9d88db6b24acbb4827a5023 /include/linux/pfn.h
parent4a389810bc3cb0e73443104f0827e81e23cb1e12 (diff)
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mm: fix pfn_t vs highmem
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: 01c8f1c44b83 ("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>
Diffstat (limited to 'include/linux/pfn.h')
-rw-r--r--include/linux/pfn.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/pfn.h b/include/linux/pfn.h
index 2d8e49711b63..1132953235c0 100644
--- a/include/linux/pfn.h
+++ b/include/linux/pfn.h
@@ -10,7 +10,7 @@
* backing is indicated by flags in the high bits of the value.
*/
typedef struct {
- unsigned long val;
+ u64 val;
} pfn_t;
#endif