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Mon, 10 Feb 2025 00:21:13 -0500 (EST) From: David Reaver To: Greg Kroah-Hartman , "Rafael J . Wysocki" , Danilo Krummrich Cc: David Reaver , Steven Rostedt , Christian Brauner , Alexander Viro , linux-fsdevel@vger.kernel.org, cocci@inria.fr, linux-kernel@vger.kernel.org Subject: [RFC PATCH 0/6] debugfs: Replace dentry with an opaque handle in debugfs API Date: Sun, 9 Feb 2025 21:20:20 -0800 Message-ID: <20250210052039.144513-1-me@davidreaver.com> X-Mailer: git-send-email 2.47.0 Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Overview ======== This patch series replaces raw dentry pointers in the debugfs API with an opaque wrapper struct: struct debugfs_node { struct dentry dentry; }; Intermediate commits rely on "#define debugfs_node dentry" to migrate debugfs users without breaking the build. The final commit introduces the struct and updates debugfs internals accordingly. Why an RFC? =========== This is a large change, and I expect a few iterations -- unless this entire approach is NACKed of course :) Any advice is appreciated, and I'm particularly looking for feedback on the following: 1. This change touches over 1100 files. Is that okay? I've been told it is because the patch series does "one thing", but it is a lot of files to touch across many systems. 2. The trickiest part of this migration is ensuring a declaration for struct debugfs_node is in scope so we don't get errors that it is being implicitly defined, especially as different kernel configurations change which headers are transitively included. See "#includes and #defines" below. I'm open to any other migration strategies. 3. This change is mostly automated with Coccinelle, but I'm really contorting Coccinelle to replace dentry with debugfs_node in different kinds of declarations. Any Coccinelle advice would be appreciated. Purpose/Background ================== debugfs currently relies on dentry to represent its filesystem hierarchy, and its API directly exposes dentry pointers to users. This tight coupling makes it difficult to modify debugfs internals. A dentry and inode should exist only when needed, rather than being persistently tied to debugfs. Some kernel developers have proposed using an opaque handle for debugfs nodes instead of dentry pointers [1][2][3]. Replacing dentry with debugfs_node simplifies future migrations away from dentry. Additionally, a declaration with debugfs_node is more self-explanatory -- its purpose is immediately clear, unlike dentry, which requires further context to understand its role as a debugfs dentry. About this patch series ======================= This series makes the following changes: 1. Add a temporary "#define debugfs_node dentry". 2. Introduce debugfs helper functions used by Coccinelle rules. 3. Update relay to use debugfs_node instead of dentry. 4. Use Coccinelle to convert most of the kernel to debugfs_node. 5. Apply manual fixes for cases Coccinelle missed. 6. Remove the #define and introduce struct debugfs_node. The #define is placed in both debugfs.h and dcache.h to avoid unnecessary #include additions or forward declarations that would be removed in the final commit. Most changes outside of fs/debugfs/ were mechanical and handled by Coccinelle. Manual fixes were needed in cases where Coccinelle couldn't fully convert the code, like dentry declarations nested in layers of headers or function calls, code inside macros, etc. The changes to fs/debugfs/ are straightforward, swapping dentry with debugfs_node in the API where appropriate. Internal functions convert between the two as needed. I introduced a few trivial helper functions for specific debugfs users. Thanks to Al Viro's recent refactoring, parts of this change were simpler to implement. Relay changes ============= The most non-obvious change is in the relay system. While the relay documentation suggests support for non-debugfs users, in practice all relay users rely on debugfs. I updated relay to use debugfs_node and revised the documentation. Coccinelle ========== I wrote a Coccinelle script to automate most of the conversion. The script is inlined at the bottom of the commit message where it was run. This is my first time using Coccinelle, so any feedback is welcome! The script does the following: - Find all dentry identifiers that are arguments to or return values of a debugfs_* function. This step detects both debugfs.h functions and various wrapper functions defined outside of debugfs proper. - Update relevant declarations and function signatures to use debugfs_node instead of dentry. - Perform further fixups where appropriate. For example, replace d_inode() or ->d_inode with debugfs_node_inode(). Challenges I encountered: - Running a single spatch invocation over the whole tree produces inconsistent results because of how header diffs are resolved. spatch can take different paths to resolve a header file, sometimes resulting in different -- sometimes conflicting -- patch hunks. I avoided this problem by writing a bash script that runs spatch against any files containing "dentry" or "debugfs", one-by-one. - The script is more verbose than I would like. I started small but had to break out cases and duplicate rules for clarity and reliability. I focused on handling the most common cases rather than covering every edge case, balancing script complexity with effectiveness. The script performs pretty well -- most of this patch set was generated from it. All clever attempts I made to add new rules resulted in needing more manual fixups. #includes and #defines ====================== struct dentry is implicitly defined, transitively included (usually through ), or defined with a forward declaration in much of the files affected by this patch series. Usually is _not_ included in those same files. For the intermediate commits, we need to ensure the #define is in scope wherever debugfs_node is used so it isn't considered a forward declaration of a distinct type. Automatically ensuring the #define and/or a debugfs.h include is in scope is difficult. I found one heuristic that was easy to automate and mostly does the job: in files we modify, wherever there is a forward declaration of "struct dentry;", temporarily add a "#define debugfs_node" right below it. The Coccinelle script implements this heuristic. The final commit removes these #defines and replaces the dentry declaration with debugfs_node. Suggestions for solving this problem without peppering #defines in an intermediate commit is welcome. I'm still not totally confident that _some_ kernel configuration won't break because an #include is missing. I originally had this entire patch series reversed, where we immediately define struct debugfs_node without an intermediate #define, but the whole migration has to be done in a single commit for that to work. This approach suffers from similar issues about debugfs_node being in scope to avoid implicit declaration errors. Testing ======= My primary form of testing was compiling without errors. This was tested by building every commit in this series on an x86_64 machine with allmodconfig, as well as cross-compiling to s390, arm, and powerpc64. I also loaded a more minimal kernel into QEMU and ran: find /sys/kernel/debug -type f -exec stat {} + To catch any missed instances of dentry declarations related to debugfs, I ran the following ripgrep command and reviewed its output to ensure I didn't miss anything obvious: rg 'struct dentry \*.*(debug|dbg)|(debug|dbg).*struct dentry \*' \ -g '*.{c,h}' -g '!fs/debugfs' -g '!include/linux/debugfs.h' Links ===== Link: https://lore.kernel.org/all/2024012600-dose-happiest-f57d@gregkh/ [1] Link: https://lore.kernel.org/all/20240125104822.04a5ad44@gandalf.local.home/ [2] Link: https://lore.kernel.org/all/20250128102744.1b94a789@gandalf.local.home/ [3] David Reaver (6): debugfs: Add temporary "#define debugfs_node dentry" directives debugfs: Add helper functions for debugfs_node encapsulation relay: Replace dentry with debugfs_node debugfs: Automated conversion from dentry to debugfs_node debugfs: Manual fixes for incomplete Coccinelle conversions debugfs: Replace debugfs_node #define with struct wrapping dentry Documentation/filesystems/relay.rst | 32 ++- arch/arm/mach-omap1/pm.c | 2 +- arch/arm/mach-omap2/pm-debug.c | 6 +- arch/loongarch/kernel/kdebugfs.c | 2 +- arch/microblaze/include/asm/processor.h | 2 +- arch/microblaze/kernel/setup.c | 2 +- arch/mips/cavium-octeon/oct_ilm.c | 2 +- arch/mips/include/asm/debug.h | 2 +- arch/mips/kernel/setup.c | 2 +- arch/mips/math-emu/me-debugfs.c | 4 +- arch/mips/mm/sc-debugfs.c | 2 +- arch/powerpc/include/asm/kvm_ppc.h | 2 +- arch/powerpc/include/asm/vas.h | 2 +- arch/powerpc/kernel/iommu.c | 4 +- arch/powerpc/kernel/kdebugfs.c | 2 +- arch/powerpc/kernel/traps.c | 2 +- arch/powerpc/kvm/book3s_hv.c | 6 +- arch/powerpc/kvm/book3s_xics.h | 2 +- arch/powerpc/kvm/book3s_xive.h | 2 +- arch/powerpc/kvm/powerpc.c | 3 +- arch/powerpc/kvm/timing.c | 2 +- arch/powerpc/kvm/timing.h | 4 +- arch/powerpc/platforms/powernv/memtrace.c | 6 +- arch/powerpc/platforms/powernv/opal-imc.c | 4 +- arch/powerpc/platforms/powernv/opal-lpc.c | 4 +- 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drivers/acpi/apei/einj-core.c | 2 +- drivers/acpi/debugfs.c | 2 +- drivers/acpi/ec_sys.c | 4 +- drivers/acpi/internal.h | 2 +- drivers/android/binder.c | 4 +- drivers/android/binder_internal.h | 2 +- drivers/base/component.c | 2 +- drivers/base/regmap/internal.h | 2 +- drivers/base/regmap/regmap-debugfs.c | 2 +- drivers/block/aoe/aoe.h | 2 +- drivers/block/aoe/aoeblk.c | 2 +- drivers/block/brd.c | 2 +- drivers/block/drbd/drbd_debugfs.c | 26 +- drivers/block/drbd/drbd_int.h | 30 +-- drivers/block/mtip32xx/mtip32xx.c | 2 +- drivers/block/mtip32xx/mtip32xx.h | 2 +- drivers/block/nbd.c | 8 +- drivers/block/pktcdvd.c | 2 +- drivers/block/zram/zram_drv.c | 2 +- drivers/block/zram/zram_drv.h | 2 +- drivers/bluetooth/btmrvl_debugfs.c | 4 +- drivers/bluetooth/hci_qca.c | 2 +- drivers/bus/mhi/host/debugfs.c | 2 +- drivers/bus/moxtet.c | 2 +- drivers/bus/mvebu-mbus.c | 6 +- drivers/cache/sifive_ccache.c | 2 +- drivers/cdx/cdx.c | 2 +- drivers/char/virtio_console.c | 4 +- drivers/clk/baikal-t1/ccu-div.c | 12 +- drivers/clk/baikal-t1/ccu-pll.c | 2 +- drivers/clk/bcm/clk-bcm2835.c | 8 +- drivers/clk/clk-fractional-divider.c | 2 +- drivers/clk/clk.c | 9 +- drivers/clk/davinci/pll.c | 5 +- .../clk/starfive/clk-starfive-jh7110-pll.c | 3 +- drivers/clk/starfive/clk-starfive-jh71x0.c | 3 +- drivers/clk/tegra/clk-dfll.c | 4 +- drivers/crypto/allwinner/sun4i-ss/sun4i-ss.h | 4 +- .../crypto/allwinner/sun8i-ce/sun8i-ce-core.c | 4 +- drivers/crypto/allwinner/sun8i-ce/sun8i-ce.h | 4 +- .../crypto/allwinner/sun8i-ss/sun8i-ss-core.c | 4 +- drivers/crypto/allwinner/sun8i-ss/sun8i-ss.h | 4 +- drivers/crypto/amlogic/amlogic-gxl-core.c | 2 +- drivers/crypto/amlogic/amlogic-gxl.h | 2 +- drivers/crypto/axis/artpec6_crypto.c | 2 +- drivers/crypto/bcm/cipher.h | 4 +- drivers/crypto/caam/caamalg_qi2.h | 2 +- drivers/crypto/caam/ctrl.c | 2 +- drivers/crypto/caam/debugfs.c | 2 +- drivers/crypto/caam/debugfs.h | 6 +- drivers/crypto/caam/intern.h | 2 +- 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drivers/ufs/host/ufshcd-pci.c | 4 +- drivers/usb/chipidea/debug.c | 2 +- drivers/usb/common/common.c | 2 +- drivers/usb/common/ulpi.c | 4 +- drivers/usb/dwc2/core.h | 4 +- drivers/usb/dwc2/debugfs.c | 4 +- drivers/usb/dwc3/core.h | 2 +- drivers/usb/dwc3/debugfs.c | 4 +- drivers/usb/fotg210/fotg210-hcd.c | 4 +- drivers/usb/gadget/udc/atmel_usba_udc.c | 4 +- drivers/usb/gadget/udc/atmel_usba_udc.h | 4 +- drivers/usb/gadget/udc/bcm63xx_udc.c | 2 +- drivers/usb/gadget/udc/gr_udc.c | 2 +- drivers/usb/gadget/udc/pxa27x_udc.c | 2 +- drivers/usb/gadget/udc/renesas_usb3.c | 2 +- drivers/usb/host/ehci-dbg.c | 2 +- drivers/usb/host/ehci.h | 2 +- drivers/usb/host/fhci.h | 2 +- drivers/usb/host/ohci-dbg.c | 4 +- drivers/usb/host/ohci.h | 2 +- drivers/usb/host/uhci-debug.c | 2 +- drivers/usb/host/xhci-debugfs.c | 18 +- drivers/usb/host/xhci-debugfs.h | 4 +- drivers/usb/host/xhci.h | 4 +- drivers/usb/mon/mon_text.c | 2 +- drivers/usb/mon/usb_mon.h | 6 +- drivers/usb/mtu3/mtu3.h | 2 +- drivers/usb/mtu3/mtu3_debugfs.c | 16 +- drivers/usb/musb/musb_core.h | 2 +- drivers/usb/musb/musb_debugfs.c | 2 +- drivers/usb/musb/musb_dsps.c | 4 +- drivers/usb/typec/mux/intel_pmc_mux.c | 6 +- drivers/usb/typec/tcpm/fusb302.c | 2 +- drivers/usb/typec/tcpm/tcpm.c | 2 +- drivers/usb/typec/ucsi/debugfs.c | 2 +- drivers/usb/typec/ucsi/ucsi.h | 3 +- drivers/vdpa/mlx5/net/debug.c | 2 +- drivers/vdpa/mlx5/net/mlx5_vnet.h | 12 +- drivers/vdpa/pds/aux_drv.h | 2 +- drivers/vdpa/pds/debugfs.c | 2 +- drivers/vfio/debugfs.c | 4 +- .../vfio/pci/hisilicon/hisi_acc_vfio_pci.c | 4 +- drivers/video/fbdev/omap2/omapfb/dss/core.c | 2 +- drivers/video/fbdev/omap2/omapfb/dss/dss.h | 1 + drivers/virtio/virtio_debug.c | 2 +- drivers/watchdog/bcm_kona_wdt.c | 4 +- drivers/watchdog/dw_wdt.c | 2 +- drivers/watchdog/ie6xx_wdt.c | 2 +- drivers/watchdog/mei_wdt.c | 4 +- fs/bcachefs/bcachefs.h | 4 +- fs/bcachefs/debug.c | 4 +- fs/ceph/super.h | 14 +- fs/debugfs/file.c | 117 ++++----- fs/debugfs/inode.c | 232 +++++++++++------- fs/debugfs/internal.h | 6 + fs/dlm/debug_fs.c | 6 +- fs/dlm/dlm_internal.h | 12 +- fs/f2fs/debug.c | 2 +- fs/gfs2/glock.c | 2 +- fs/gfs2/incore.h | 2 +- fs/ocfs2/blockcheck.c | 8 +- fs/ocfs2/blockcheck.h | 4 +- fs/ocfs2/cluster/heartbeat.c | 10 +- fs/ocfs2/cluster/netdebug.c | 2 +- fs/ocfs2/dlm/dlmcommon.h | 2 +- fs/ocfs2/dlm/dlmdebug.c | 2 +- fs/ocfs2/ocfs2.h | 2 +- fs/ocfs2/super.c | 2 +- fs/orangefs/orangefs-debugfs.c | 4 +- fs/pstore/ftrace.c | 2 +- fs/ubifs/debug.c | 76 +++--- fs/ubifs/debug.h | 22 +- fs/xfs/scrub/stats.c | 7 +- fs/xfs/scrub/stats.h | 6 +- fs/xfs/xfs_mount.h | 2 +- fs/xfs/xfs_super.c | 8 +- fs/xfs/xfs_super.h | 3 +- include/drm/drm_bridge.h | 2 +- include/drm/drm_connector.h | 5 +- include/drm/drm_crtc.h | 2 +- include/drm/drm_debugfs.h | 15 +- include/drm/drm_device.h | 2 +- include/drm/drm_drv.h | 5 +- include/drm/drm_encoder.h | 4 +- include/drm/drm_file.h | 5 +- include/drm/drm_panel.h | 4 +- include/drm/ttm/ttm_resource.h | 3 +- include/kunit/test.h | 2 +- include/linux/backing-dev-defs.h | 3 +- include/linux/blk-mq.h | 4 +- include/linux/blkdev.h | 6 +- include/linux/blktrace_api.h | 2 +- include/linux/cdx/cdx_bus.h | 2 +- include/linux/ceph/libceph.h | 8 +- include/linux/ceph/mon_client.h | 2 +- include/linux/ceph/osd_client.h | 2 +- include/linux/clk-provider.h | 4 +- include/linux/closure.h | 2 +- include/linux/debugfs.h | 192 +++++++++------ include/linux/dmaengine.h | 2 +- include/linux/edac.h | 2 +- include/linux/fault-inject.h | 11 +- include/linux/firmware/cirrus/cs_dsp.h | 5 +- include/linux/fsl/ptp_qoriq.h | 2 +- include/linux/greybus.h | 2 +- include/linux/greybus/svc.h | 2 +- include/linux/hid.h | 6 +- include/linux/hisi_acc_qm.h | 4 +- include/linux/hyperv.h | 2 +- include/linux/i2c.h | 4 +- include/linux/iio/iio-opaque.h | 2 +- include/linux/iio/iio.h | 4 +- include/linux/intel_tpmi.h | 2 +- include/linux/iommu.h | 2 +- include/linux/irqdesc.h | 5 +- include/linux/kvm_host.h | 5 +- include/linux/mfd/aat2870.h | 2 +- include/linux/mhi.h | 2 +- include/linux/mlx5/driver.h | 24 +- include/linux/mmc/card.h | 2 +- include/linux/mmc/host.h | 2 +- include/linux/moxtet.h | 2 +- include/linux/mtd/mtd.h | 2 +- include/linux/mtd/spi-nor.h | 2 +- include/linux/phy/phy.h | 2 +- include/linux/pktcdvd.h | 4 +- include/linux/power/smartreflex.h | 2 +- include/linux/regulator/driver.h | 2 +- include/linux/relay.h | 19 +- include/linux/remoteproc.h | 2 +- include/linux/shrinker.h | 2 +- include/linux/soundwire/sdw.h | 5 +- include/linux/sunrpc/clnt.h | 2 +- include/linux/sunrpc/xprt.h | 2 +- include/linux/swiotlb.h | 2 +- include/linux/thunderbolt.h | 2 +- include/linux/usb.h | 2 +- include/linux/vfio.h | 2 +- include/linux/virtio.h | 2 +- include/linux/wkup_m3_ipc.h | 2 +- include/linux/wwan.h | 8 +- include/linux/xattr.h | 1 + include/media/cec.h | 2 +- include/media/v4l2-async.h | 5 +- include/media/v4l2-dev.h | 5 +- include/media/v4l2-dv-timings.h | 8 +- include/net/6lowpan.h | 2 +- include/net/bluetooth/bluetooth.h | 2 +- include/net/bluetooth/hci_core.h | 4 +- include/net/bonding.h | 2 +- include/net/cfg80211.h | 2 +- include/net/mac80211.h | 14 +- include/net/mana/gdma.h | 4 +- include/net/mana/mana.h | 10 +- include/soc/tegra/bpmp.h | 2 +- include/soc/tegra/mc.h | 2 +- include/sound/core.h | 4 +- include/sound/soc-component.h | 2 +- include/sound/soc-dapm.h | 5 +- include/sound/soc-dpcm.h | 2 +- include/sound/soc.h | 6 +- include/ufs/ufshcd.h | 2 +- kernel/dma/debug.c | 2 +- kernel/dma/map_benchmark.c | 4 +- kernel/dma/pool.c | 2 +- kernel/fail_function.c | 6 +- kernel/futex/core.c | 2 +- kernel/gcov/fs.c | 6 +- kernel/irq/debugfs.c | 4 +- kernel/irq/internals.h | 4 +- kernel/irq/irqdomain.c | 4 +- kernel/kprobes.c | 2 +- kernel/locking/lock_events.c | 2 +- kernel/module/internal.h | 2 +- kernel/module/main.c | 2 +- kernel/module/tracking.c | 2 +- kernel/power/energy_model.c | 8 +- kernel/printk/index.c | 4 +- kernel/relay.c | 88 +++---- kernel/sched/debug.c | 16 +- kernel/trace/blktrace.c | 8 +- kernel/trace/trace.h | 2 +- lib/842/842_debugfs.h | 2 +- lib/debugobjects.c | 2 +- lib/dynamic_debug.c | 2 +- lib/error-inject.c | 2 +- lib/fault-inject-usercopy.c | 2 +- lib/fault-inject.c | 13 +- lib/kunit/debugfs.c | 2 +- lib/memory-notifier-error-inject.c | 2 +- lib/netdev-notifier-error-inject.c | 2 +- lib/notifier-error-inject.c | 18 +- lib/notifier-error-inject.h | 9 +- lib/of-reconfig-notifier-error-inject.c | 2 +- lib/pm-notifier-error-inject.c | 2 +- lib/stackdepot.c | 2 +- lib/test_fpu_glue.c | 2 +- mm/backing-dev.c | 2 +- mm/cma_debug.c | 7 +- mm/fail_page_alloc.c | 2 +- mm/failslab.c | 2 +- mm/hwpoison-inject.c | 2 +- mm/internal.h | 8 +- mm/kfence/core.c | 2 +- mm/memblock.c | 2 +- mm/page_owner.c | 2 +- mm/shrinker.c | 2 +- mm/shrinker_debug.c | 13 +- mm/slub.c | 4 +- mm/vmstat.c | 2 +- mm/zsmalloc.c | 4 +- mm/zswap.c | 2 +- net/6lowpan/debugfs.c | 10 +- net/bluetooth/6lowpan.c | 4 +- net/bluetooth/af_bluetooth.c | 2 +- net/bluetooth/iso.c | 2 +- net/bluetooth/l2cap_core.c | 2 +- net/bluetooth/rfcomm/core.c | 2 +- net/bluetooth/rfcomm/sock.c | 2 +- net/bluetooth/sco.c | 2 +- net/caif/caif_socket.c | 2 +- net/ceph/debugfs.c | 2 +- net/core/skb_fault_injection.c | 2 +- net/hsr/hsr_debugfs.c | 4 +- net/hsr/hsr_main.h | 2 +- net/l2tp/l2tp_debugfs.c | 2 +- net/mac80211/debugfs.c | 4 +- net/mac80211/debugfs_netdev.c | 14 +- net/mac80211/debugfs_sta.c | 2 +- net/mac80211/driver-ops.h | 6 +- net/mac80211/ieee80211_i.h | 16 +- net/mac80211/key.h | 4 +- net/mac80211/rate.h | 2 +- net/mac80211/rc80211_minstrel_ht.c | 2 +- net/mac80211/rc80211_minstrel_ht.h | 3 +- net/mac80211/rc80211_minstrel_ht_debugfs.c | 3 +- net/mac80211/sta_info.h | 4 +- net/sunrpc/debugfs.c | 13 +- net/wireless/core.c | 2 +- net/wireless/debugfs.c | 6 +- samples/qmi/qmi_sample_client.c | 8 +- sound/core/jack.c | 2 +- sound/core/sound.c | 2 +- sound/drivers/pcmtest.c | 2 +- sound/pci/hda/cs35l56_hda.h | 3 +- sound/soc/codecs/cs35l56.c | 2 +- sound/soc/fsl/fsl_ssi.h | 2 +- sound/soc/fsl/imx-audmux.c | 2 +- sound/soc/intel/avs/avs.h | 2 +- sound/soc/mediatek/mt8195/mt8195-afe-common.h | 2 +- sound/soc/mediatek/mt8365/mt8365-afe-common.h | 2 +- sound/soc/renesas/rcar/debugfs.c | 2 +- sound/soc/soc-core.c | 2 +- sound/soc/soc-dapm.c | 4 +- sound/soc/sof/debug.c | 2 +- sound/soc/sof/ipc4-mtrace.c | 2 +- sound/soc/sof/sof-client-ipc-flood-test.c | 6 +- .../soc/sof/sof-client-ipc-kernel-injector.c | 4 +- sound/soc/sof/sof-client-ipc-msg-injector.c | 4 +- sound/soc/sof/sof-client-probes.c | 2 +- sound/soc/sof/sof-client-probes.h | 4 +- sound/soc/sof/sof-client.c | 2 +- sound/soc/sof/sof-client.h | 3 +- sound/soc/sof/sof-priv.h | 2 +- virt/kvm/kvm_main.c | 11 +- 1117 files changed, 2971 insertions(+), 2636 deletions(-) base-commit: a64dcfb451e254085a7daee5fe51bf22959d52d3