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authorKhalid Aziz <khalid.aziz@oracle.com>2018-02-21 10:15:44 -0700
committerDavid S. Miller <davem@davemloft.net>2018-03-18 07:38:45 -0700
commitca827d55ebaa24de9fca36ee24e42d6fc5119ee3 (patch)
tree12b0ff1c2705daaeeeb7fd4d5a0be63d7098016f /mm/memory.c
parentd84bb709aa4a6a155b1aaaf449cad21f02be4594 (diff)
downloadlinux-ca827d55ebaa24de9fca36ee24e42d6fc5119ee3.tar.bz2
mm, swap: Add infrastructure for saving page metadata on swap
If a processor supports special metadata for a page, for example ADI version tags on SPARC M7, this metadata must be saved when the page is swapped out. The same metadata must be restored when the page is swapped back in. This patch adds two new architecture specific functions - arch_do_swap_page() to be called when a page is swapped in, and arch_unmap_one() to be called when a page is being unmapped for swap out. These architecture hooks allow page metadata to be saved if the architecture supports it. Signed-off-by: Khalid Aziz <khalid.aziz@oracle.com> Cc: Khalid Aziz <khalid@gonehiking.org> Acked-by: Jerome Marchand <jmarchan@redhat.com> Reviewed-by: Anthony Yznaga <anthony.yznaga@oracle.com> Acked-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'mm/memory.c')
-rw-r--r--mm/memory.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/mm/memory.c b/mm/memory.c
index 5fcfc24904d1..aed37325d94e 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3053,6 +3053,7 @@ int do_swap_page(struct vm_fault *vmf)
if (pte_swp_soft_dirty(vmf->orig_pte))
pte = pte_mksoft_dirty(pte);
set_pte_at(vma->vm_mm, vmf->address, vmf->pte, pte);
+ arch_do_swap_page(vma->vm_mm, vma, vmf->address, pte, vmf->orig_pte);
vmf->orig_pte = pte;
/* ksm created a completely new copy */