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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>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.