Using uninitialized_var() is dangerous as it papers over real bugs[1] (or can in the future), and suppresses unrelated compiler warnings (e.g. "unused variable"). If the compiler thinks it is uninitialized, either simply initialize the variable or make compiler changes. As recommended[2] by[3] Linus[4], remove the macro. Most of the 300 uses don't cause any warnings on gcc 9.3.0, so they're in a single treewide commit in this series. A few others needed to actually get cleaned up, and I broke those out into individual patches. -Kees [1] https://lore.kernel.org/lkml/20200603174714.192027-1-glider@xxxxxxxxxx/ [2] https://lore.kernel.org/lkml/CA+55aFw+Vbj0i=1TGqCR5vQkCzWJ0QxK6CernOU6eedsudAixw@xxxxxxxxxxxxxx/ [3] https://lore.kernel.org/lkml/CA+55aFwgbgqhbp1fkxvRKEpzyR5J8n1vKT1VZdz9knmPuXhOeg@xxxxxxxxxxxxxx/ [4] https://lore.kernel.org/lkml/CA+55aFz2500WfbKXAx8s67wrm9=yVJu65TpLgN_ybYNv0VEOKA@xxxxxxxxxxxxxx/ Kees Cook (10): x86/mm/numa: Remove uninitialized_var() usage drbd: Remove uninitialized_var() usage b43: Remove uninitialized_var() usage rtlwifi: rtl8192cu: Remove uninitialized_var() usage ide: Remove uninitialized_var() usage clk: st: Remove uninitialized_var() usage spi: davinci: Remove uninitialized_var() usage checkpatch: Remove awareness of uninitialized_var() macro treewide: Remove uninitialized_var() usage compiler: Remove uninitialized_var() macro arch/arm/mach-sa1100/assabet.c | 2 +- arch/arm/mm/alignment.c | 2 +- arch/ia64/kernel/process.c | 2 +- arch/ia64/mm/discontig.c | 2 +- arch/ia64/mm/tlb.c | 2 +- arch/mips/lib/dump_tlb.c | 2 +- arch/mips/mm/init.c | 2 +- arch/mips/mm/tlb-r4k.c | 6 +++--- arch/powerpc/kvm/book3s_64_mmu_radix.c | 2 +- arch/powerpc/kvm/book3s_pr.c | 2 +- arch/powerpc/kvm/powerpc.c | 2 +- arch/powerpc/platforms/52xx/mpc52xx_pic.c | 2 +- arch/s390/kernel/smp.c | 2 +- arch/x86/kernel/quirks.c | 10 +++++----- arch/x86/kvm/mmu/mmu.c | 2 +- arch/x86/kvm/mmu/paging_tmpl.h | 2 +- arch/x86/kvm/x86.c | 2 +- arch/x86/mm/numa.c | 18 +++++++++--------- block/blk-merge.c | 2 +- drivers/acpi/acpi_pad.c | 2 +- drivers/ata/libata-scsi.c | 2 +- drivers/atm/zatm.c | 2 +- drivers/block/drbd/drbd_nl.c | 6 +++--- drivers/block/drbd/drbd_state.c | 2 +- drivers/block/rbd.c | 2 +- drivers/clk/clk-gate.c | 2 +- drivers/clk/spear/clk-vco-pll.c | 2 +- drivers/clk/st/clkgen-fsyn.c | 1 - drivers/crypto/nx/nx-842-powernv.c | 2 +- drivers/firewire/ohci.c | 14 +++++++------- drivers/gpu/drm/bridge/sil-sii8620.c | 2 +- drivers/gpu/drm/drm_edid.c | 2 +- drivers/gpu/drm/exynos/exynos_drm_dsi.c | 6 +++--- drivers/gpu/drm/i915/display/intel_fbc.c | 2 +- drivers/gpu/drm/i915/gt/intel_lrc.c | 2 +- drivers/gpu/drm/i915/intel_uncore.c | 2 +- .../gpu/drm/rockchip/dw-mipi-dsi-rockchip.c | 4 ++-- drivers/i2c/busses/i2c-rk3x.c | 2 +- drivers/ide/ide-acpi.c | 2 +- drivers/ide/ide-atapi.c | 2 +- drivers/ide/ide-io-std.c | 4 ++-- drivers/ide/ide-io.c | 8 ++++---- drivers/ide/ide-sysfs.c | 2 +- drivers/ide/ide-taskfile.c | 1 - drivers/ide/umc8672.c | 2 +- drivers/idle/intel_idle.c | 2 +- drivers/infiniband/core/uverbs_cmd.c | 4 ++-- drivers/infiniband/hw/cxgb4/cm.c | 2 +- drivers/infiniband/hw/cxgb4/cq.c | 2 +- drivers/infiniband/hw/mlx4/qp.c | 6 +++--- drivers/infiniband/hw/mlx5/cq.c | 6 +++--- drivers/infiniband/hw/mlx5/devx.c | 2 +- drivers/infiniband/hw/mlx5/qp.c | 2 +- drivers/infiniband/hw/mthca/mthca_qp.c | 10 +++++----- drivers/infiniband/sw/siw/siw_qp_rx.c | 2 +- drivers/input/serio/serio_raw.c | 2 +- drivers/input/touchscreen/sur40.c | 2 +- drivers/iommu/intel-iommu.c | 2 +- drivers/md/dm-io.c | 2 +- drivers/md/dm-ioctl.c | 2 +- drivers/md/dm-snap-persistent.c | 2 +- drivers/md/dm-table.c | 2 +- drivers/md/dm-writecache.c | 2 +- drivers/md/raid5.c | 2 +- drivers/media/dvb-frontends/rtl2832.c | 2 +- drivers/media/tuners/qt1010.c | 4 ++-- drivers/media/usb/gspca/vicam.c | 2 +- drivers/media/usb/uvc/uvc_video.c | 8 ++++---- drivers/memstick/host/jmb38x_ms.c | 2 +- drivers/memstick/host/tifm_ms.c | 2 +- drivers/mmc/host/sdhci.c | 2 +- drivers/mtd/nand/raw/nand_ecc.c | 2 +- drivers/mtd/nand/raw/s3c2410.c | 2 +- drivers/mtd/parsers/afs.c | 4 ++-- drivers/mtd/ubi/eba.c | 2 +- drivers/net/can/janz-ican3.c | 2 +- drivers/net/ethernet/broadcom/bnx2.c | 4 ++-- .../ethernet/mellanox/mlx5/core/pagealloc.c | 4 ++-- drivers/net/ethernet/neterion/s2io.c | 2 +- drivers/net/ethernet/qlogic/qla3xxx.c | 2 +- drivers/net/ethernet/sun/cassini.c | 2 +- drivers/net/ethernet/sun/niu.c | 6 +++--- drivers/net/wan/z85230.c | 2 +- drivers/net/wireless/ath/ath10k/core.c | 2 +- drivers/net/wireless/ath/ath6kl/init.c | 2 +- drivers/net/wireless/ath/ath9k/init.c | 2 +- drivers/net/wireless/broadcom/b43/debugfs.c | 2 +- drivers/net/wireless/broadcom/b43/dma.c | 2 +- drivers/net/wireless/broadcom/b43/lo.c | 2 +- drivers/net/wireless/broadcom/b43/phy_n.c | 12 ++++++++---- drivers/net/wireless/broadcom/b43/xmit.c | 12 ++++++------ .../net/wireless/broadcom/b43legacy/debugfs.c | 2 +- drivers/net/wireless/broadcom/b43legacy/main.c | 2 +- drivers/net/wireless/intel/iwlegacy/3945.c | 2 +- drivers/net/wireless/intel/iwlegacy/4965-mac.c | 2 +- .../wireless/realtek/rtlwifi/rtl8192cu/hw.c | 8 ++++---- drivers/pci/pcie/aer.c | 2 +- drivers/platform/x86/hdaps.c | 4 ++-- drivers/scsi/dc395x.c | 2 +- drivers/scsi/pm8001/pm8001_hwi.c | 2 +- drivers/scsi/pm8001/pm80xx_hwi.c | 2 +- drivers/spi/spi-davinci.c | 1 - drivers/ssb/driver_chipcommon.c | 4 ++-- drivers/tty/cyclades.c | 2 +- drivers/tty/isicom.c | 2 +- drivers/usb/musb/cppi_dma.c | 2 +- drivers/usb/storage/sddr55.c | 4 ++-- drivers/vhost/net.c | 6 +++--- drivers/video/fbdev/matrox/matroxfb_maven.c | 6 +++--- drivers/video/fbdev/pm3fb.c | 6 +++--- drivers/video/fbdev/riva/riva_hw.c | 3 +-- drivers/virtio/virtio_ring.c | 6 +++--- fs/afs/dir.c | 2 +- fs/afs/security.c | 2 +- fs/dlm/netlink.c | 2 +- fs/erofs/data.c | 4 ++-- fs/erofs/zdata.c | 2 +- fs/f2fs/data.c | 2 +- fs/fat/dir.c | 2 +- fs/fuse/control.c | 4 ++-- fs/fuse/cuse.c | 2 +- fs/fuse/file.c | 2 +- fs/gfs2/aops.c | 2 +- fs/gfs2/bmap.c | 2 +- fs/gfs2/lops.c | 2 +- fs/hfsplus/unicode.c | 2 +- fs/isofs/namei.c | 4 ++-- fs/jffs2/erase.c | 2 +- fs/nfsd/nfsctl.c | 2 +- fs/ocfs2/alloc.c | 4 ++-- fs/ocfs2/dir.c | 14 +++++++------- fs/ocfs2/extent_map.c | 4 ++-- fs/ocfs2/namei.c | 2 +- fs/ocfs2/refcounttree.c | 2 +- fs/ocfs2/xattr.c | 2 +- fs/omfs/file.c | 2 +- fs/overlayfs/copy_up.c | 4 ++-- fs/ubifs/commit.c | 6 +++--- fs/ubifs/dir.c | 2 +- fs/ubifs/file.c | 4 ++-- fs/ubifs/journal.c | 4 ++-- fs/ubifs/lpt.c | 2 +- fs/ubifs/tnc.c | 6 +++--- fs/ubifs/tnc_misc.c | 4 ++-- fs/udf/balloc.c | 2 +- fs/xfs/xfs_bmap_util.c | 2 +- include/linux/compiler-clang.h | 2 -- include/linux/compiler-gcc.h | 6 ------ include/linux/page-flags-layout.h | 2 +- include/net/flow_offload.h | 2 +- kernel/async.c | 4 ++-- kernel/audit.c | 2 +- kernel/debug/kdb/kdb_io.c | 2 +- kernel/dma/debug.c | 2 +- kernel/events/core.c | 2 +- kernel/events/uprobes.c | 2 +- kernel/exit.c | 2 +- kernel/futex.c | 14 +++++++------- kernel/locking/lockdep.c | 16 ++++++++-------- kernel/trace/ring_buffer.c | 2 +- lib/radix-tree.c | 2 +- lib/test_lockup.c | 2 +- mm/frontswap.c | 2 +- mm/ksm.c | 2 +- mm/memcontrol.c | 2 +- mm/memory.c | 2 +- mm/mempolicy.c | 4 ++-- mm/page_alloc.c | 2 +- mm/percpu.c | 2 +- mm/slub.c | 4 ++-- mm/swap.c | 4 ++-- net/dccp/options.c | 2 +- net/ipv4/netfilter/nf_socket_ipv4.c | 6 +++--- net/ipv6/ip6_flowlabel.c | 2 +- net/ipv6/netfilter/nf_socket_ipv6.c | 2 +- net/netfilter/nf_conntrack_ftp.c | 2 +- net/netfilter/nfnetlink_log.c | 2 +- net/netfilter/nfnetlink_queue.c | 4 ++-- net/sched/cls_flow.c | 2 +- net/sched/sch_cake.c | 2 +- net/sched/sch_cbq.c | 2 +- net/sched/sch_fq_codel.c | 2 +- net/sched/sch_fq_pie.c | 2 +- net/sched/sch_hfsc.c | 2 +- net/sched/sch_htb.c | 2 +- net/sched/sch_sfq.c | 2 +- net/sunrpc/svcsock.c | 4 ++-- net/sunrpc/xprtsock.c | 10 +++++----- net/tls/tls_sw.c | 2 +- scripts/checkpatch.pl | 18 ++++++------------ sound/core/control_compat.c | 2 +- sound/isa/sb/sb16_csp.c | 2 +- sound/usb/endpoint.c | 2 +- tools/include/linux/compiler.h | 2 -- tools/virtio/linux/kernel.h | 2 -- 195 files changed, 310 insertions(+), 328 deletions(-) -- 2.25.1
