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filesystem-dax: Fix use of zero page

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Use my_zero_pfn instead of ZERO_PAGE(), and pass the vaddr to it instead
of zero so it works on MIPS and s390 who reference the vaddr to select a
zero page.

Cc: <stable@vger.kernel.org>
Fixes: 91d25ba8a6 ("dax: use common 4k zero page for dax mmap reads")
Signed-off-by: Matthew Wilcox <willy@infradead.org>
Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Matthew Wilcox 2018-09-11 21:27:44 -07:00 committed by Dan Williams
parent 11da3a7f84
commit b90ca5cc32
1 changed files with 2 additions and 11 deletions
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13
fs/dax.c
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@ -1120,21 +1120,12 @@ static vm_fault_t dax_load_hole(struct address_space *mapping, void *entry,
{
struct inode *inode = mapping->host;
unsigned long vaddr = vmf->address;
vm_fault_t ret = VM_FAULT_NOPAGE;
struct page *zero_page;
pfn_t pfn;
pfn_t pfn = pfn_to_pfn_t(my_zero_pfn(vaddr));
vm_fault_t ret;
zero_page = ZERO_PAGE(0);
if (unlikely(!zero_page)) {
ret = VM_FAULT_OOM;
goto out;
}
pfn = page_to_pfn_t(zero_page);
dax_insert_mapping_entry(mapping, vmf, entry, pfn, RADIX_DAX_ZERO_PAGE,
false);
ret = vmf_insert_mixed(vmf->vma, vaddr, pfn);
out:
trace_dax_load_hole(inode, vmf, ret);
return ret;
}