[Xen-devel] [RFC 10/23] xen/biomerge: WORKAROUND always says the biovec are not mergeable

[Julien Grall <julien.grall@xxxxxxxxxx>]

When Linux is using 64K page granularity, every page will be slipt in
multiple non-contiguous 4K MFN.

I'm not sure how to handle efficiently the check to know whether we can
merge 2 biovec with a such case. So for now, always says that biovec are
not mergeable.

Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Cc: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Cc: David Vrabel <david.vrabel@xxxxxxxxxx>
---
 drivers/xen/biomerge.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/xen/biomerge.c b/drivers/xen/biomerge.c
index 0edb91c..20387c2 100644
--- a/drivers/xen/biomerge.c
+++ b/drivers/xen/biomerge.c
@@ -9,6 +9,9 @@ bool xen_biovec_phys_mergeable(const struct bio_vec *vec1,
        unsigned long mfn1 = pfn_to_mfn(page_to_pfn(vec1->bv_page));
        unsigned long mfn2 = pfn_to_mfn(page_to_pfn(vec2->bv_page));
 
+       /* TODO: Implement it correctly */
+       return 0;
+
        return __BIOVEC_PHYS_MERGEABLE(vec1, vec2) &&
                ((mfn1 == mfn2) || ((mfn1+1) == mfn2));
 }
-- 
2.1.4


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