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authorDan Williams <dan.j.williams@intel.com>2016-02-12 01:13:17 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2016-02-12 03:35:48 +0100
commitdb78c22230d0bcc8b27b81f05b39f104f08232c5 (patch)
treed5c99cc8df77b86bd9d88db6b24acbb4827a5023 /kernel
parentkernel/locking/lockdep.c: convert hash tables to hlists (diff)
downloadlinux-db78c22230d0bcc8b27b81f05b39f104f08232c5.tar.xz
linux-db78c22230d0bcc8b27b81f05b39f104f08232c5.zip
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 'kernel')
-rw-r--r--kernel/memremap.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/memremap.c b/kernel/memremap.c
index 70ee3775de24..2c468dea60bc 100644
--- a/kernel/memremap.c
+++ b/kernel/memremap.c
@@ -150,7 +150,7 @@ void devm_memunmap(struct device *dev, void *addr)
}
EXPORT_SYMBOL(devm_memunmap);
-pfn_t phys_to_pfn_t(phys_addr_t addr, unsigned long flags)
+pfn_t phys_to_pfn_t(phys_addr_t addr, u64 flags)
{
return __pfn_to_pfn_t(addr >> PAGE_SHIFT, flags);
}