iommu/vt-d: Remove unnecessary WARN_ON()
When drivers call intel_svm_available() to check whether the
Shared Virtual Memory(SVM) is supported by the IOMMU driver,
they will get a warning in the kernel message if the SVM is
not supported by the hardware.
[ 3.790876] WARNING: CPU: 0 PID: 267 at drivers/iommu/intel-svm.c:334 intel_svm_bind_mm+0x292/0x570
[ 3.790877] Modules linked in: dsa(+) vfio_mdev mdev vfio_iommu_type1 soundcore vfio serio_raw parport_pc ppdev lp parport autofs4 psmouse virtio_net pata_acpi
[ 3.790884] CPU: 0 PID: 267 Comm: systemd-udevd Not tainted 4.15.0+ #358
[ 3.790885] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.11.0-0-g63451fca13-prebuilt.qemu-project.org 04/01/2014
[ 3.790887] RIP: 0010:intel_svm_bind_mm+0x292/0x570
[ 3.790887] RSP: 0000:
ffffac72c08a3a70 EFLAGS:
00010246
[ 3.790889] RAX:
0000000000000000 RBX:
ffff90447a5160a0 RCX:
0000000000000000
[ 3.790889] RDX:
0000000000000000 RSI:
0000000000000082 RDI:
ffff90447fc16550
[ 3.790890] RBP:
ffff90447a516000 R08:
0000000000000000 R09:
0000000000000178
[ 3.790891] R10:
0000000000000220 R11:
0000000000aaaaaa R12:
0000000000000000
[ 3.790891] R13:
0000000000000002 R14:
ffffac72c08a3b18 R15:
ffffac72c08a3eb8
[ 3.790893] FS:
00007fb21e85b8c0(0000) GS:
ffff90447fc00000(0000) knlGS:
0000000000000000
[ 3.790894] CS: 0010 DS: 0000 ES: 0000 CR0:
0000000080050033
[ 3.790894] CR2:
000055c08167d148 CR3:
000000013a6f4000 CR4:
00000000000006f0
[ 3.790903] DR0:
0000000000000000 DR1:
0000000000000000 DR2:
0000000000000000
[ 3.790904] DR3:
0000000000000000 DR6:
00000000fffe0ff0 DR7:
0000000000000400
This is caused by a unnecessary WARN_ON() in intel_svm_bind_mm().
Hence, remove it.
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>