[PATCH 1/3] Make xen_remap_domain_mfn_range return value meaningful in case of error

[Adin Scannell]

Original patch from Olaf Hering <ohering@xxxxxxxxxx>

This change fixes the xc_map_foreign_bulk interface, which would
otherwise cause SIGBUS when pages are gone because -ENOENT is not
returned as expected by the IOCTL_PRIVCMD_MMAPBATCH_V2 ioctl.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>

This is a port to the mainline Linux tree.  Functions were refactored and
renamed.  I believe that this is the only required change to match the
semantics of the original patch.

Signed-off-by: Adin Scannell <adin@xxxxxxxxxxx>
---
 arch/x86/xen/mmu.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 87f6673..288a7fc 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -2350,8 +2350,8 @@ int xen_remap_domain_mfn_range(struct vm_area_struct *vma,
 		if (err)
 			goto out;
 
-		err = -EFAULT;
-		if (HYPERVISOR_mmu_update(mmu_update, batch, NULL, domid) < 0)
+		err = HYPERVISOR_mmu_update(mmu_update, batch, NULL, domid);
+		if (err < 0)
 			goto out;
 
 		nr -= batch;
-- 
1.6.2.5

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