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authorDave Jiang <dave.jiang@intel.com>2017-02-24 14:57:08 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-02-24 17:46:54 -0800
commitc791ace1e747371658237f0d30234fef56c39669 (patch)
treede6b1b2b40d5aee5505987856bc29c259c0ff202 /fs/dax.c
parent9557feee39b75ceb502b4777e08706df1ddf10ed (diff)
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mm: replace FAULT_FLAG_SIZE with parameter to huge_fault
Since the introduction of FAULT_FLAG_SIZE to the vm_fault flag, it has been somewhat painful with getting the flags set and removed at the correct locations. More than one kernel oops was introduced due to difficulties of getting the placement correctly. Remove the flag values and introduce an input parameter to huge_fault that indicates the size of the page entry. This makes the code easier to trace and should avoid the issues we see with the fault flags where removal of the flag was necessary in the fallback paths. Link: http://lkml.kernel.org/r/148615748258.43180.1690152053774975329.stgit@djiang5-desk3.ch.intel.com Signed-off-by: Dave Jiang <dave.jiang@intel.com> Tested-by: Dan Williams <dan.j.williams@intel.com> Reviewed-by: Jan Kara <jack@suse.cz> Cc: Matthew Wilcox <mawilcox@microsoft.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Nilesh Choudhury <nilesh.choudhury@oracle.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/dax.c')
-rw-r--r--fs/dax.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/fs/dax.c b/fs/dax.c
index c3c29fbf64be..5ae8b71ebadc 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -1452,12 +1452,13 @@ static int dax_iomap_pmd_fault(struct vm_fault *vmf, struct iomap_ops *ops)
* has done all the necessary locking for page fault to proceed
* successfully.
*/
-int dax_iomap_fault(struct vm_fault *vmf, const struct iomap_ops *ops)
+int dax_iomap_fault(struct vm_fault *vmf, enum page_entry_size pe_size,
+ const struct iomap_ops *ops)
{
- switch (vmf->flags & FAULT_FLAG_SIZE_MASK) {
- case FAULT_FLAG_SIZE_PTE:
+ switch (pe_size) {
+ case PE_SIZE_PTE:
return dax_iomap_pte_fault(vmf, ops);
- case FAULT_FLAG_SIZE_PMD:
+ case PE_SIZE_PMD:
return dax_iomap_pmd_fault(vmf, ops);
default:
return VM_FAULT_FALLBACK;