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firmware: Kconfig: ROCKCHIP_SIP depends on HAVE_ARM_SMCCC and ARCH_ROCKCHIP
[firefly-linux-kernel-4.4.55.git]
/
fs
/
dax.c
diff --git
a/fs/dax.c
b/fs/dax.c
index d1e5cb7311a1de295ecd4348360a9a9947e71142..43671b68220ed968386f5c1ad9067f236fbab67e 100644
(file)
--- a/
fs/dax.c
+++ b/
fs/dax.c
@@
-541,6
+541,10
@@
int __dax_pmd_fault(struct vm_area_struct *vma, unsigned long address,
unsigned long pfn;
int result = 0;
unsigned long pfn;
int result = 0;
+ /* dax pmd mappings are broken wrt gup and fork */
+ if (!IS_ENABLED(CONFIG_FS_DAX_PMD))
+ return VM_FAULT_FALLBACK;
+
/* Fall back to PTEs if we're going to COW */
if (write && !(vma->vm_flags & VM_SHARED))
return VM_FAULT_FALLBACK;
/* Fall back to PTEs if we're going to COW */
if (write && !(vma->vm_flags & VM_SHARED))
return VM_FAULT_FALLBACK;