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Date: Sun, 29 Aug 2021 10:40:44 -0700
From: Joe Perches <joe@...ches.com>
To: Colin King <colin.king@...onical.com>,
Jesse Brandeburg <jesse.brandeburg@...el.com>,
Tony Nguyen <anthony.l.nguyen@...el.com>,
"David S . Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org
Cc: kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] igc: remove redundant continue statement
On Sun, 2021-08-29 at 17:51 +0100, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
>
> The continue statement at the end of a for-loop has no effect,
> remove it.
There seem to be a few of this type of use in the kernel.
Many are in switch {} default: continue uses inside loops where there
is no additional statement after the switch statement ends.
The continue is obviously safe and even perhaps preferred as statements
_might_ be added after the switch end or test/continue use.
But perhaps those should be converted to break;
For instance: drivers/gpu/drm/zte/zx_vou.c
static void zx_overlay_init(struct drm_device *drm, struct zx_vou_hw *vou)
{
struct device *dev = vou->dev;
struct zx_plane *zplane;
int i;
int ret;
/*
* VL0 has some quirks on scaling support which need special handling.
* Let's leave it out for now.
*/
for (i = 1; i < VL_NUM; i++) {
zplane = devm_kzalloc(dev, sizeof(*zplane), GFP_KERNEL);
if (!zplane) {
DRM_DEV_ERROR(dev, "failed to allocate zplane %d\n", i);
return;
}
zplane->layer = vou->osd + OSD_VL_OFFSET(i);
zplane->hbsc = vou->osd + HBSC_VL_OFFSET(i);
zplane->rsz = vou->otfppu + RSZ_VL_OFFSET(i);
zplane->bits = &zx_vl_bits[i];
ret = zx_plane_init(drm, zplane, DRM_PLANE_TYPE_OVERLAY);
if (ret) {
DRM_DEV_ERROR(dev, "failed to init overlay %d\n", i);
continue;
}
}
}
Here's a grep using grep version 2.5.4 that finds these
(with some false positives)
$ grep-2.5.4 -rP --include=*.[ch] -n '\t{3,3}continue;\n\t{2,2}\}\n\t{1,1}\}' *
arch/x86/events/intel/core.c:3408: continue;
}
}
arch/arm/mach-at91/pm.c:801: continue;
}
}
arch/powerpc/xmon/xmon.c:973: continue;
}
}
arch/powerpc/platforms/ps3/mm.c:450: continue;
}
}
arch/powerpc/platforms/powernv/opal-irqchip.c:286: continue;
}
}
drivers/net/vxlan.c:807: continue;
}
}
drivers/net/hamradio/6pack.c:450: continue;
}
}
drivers/net/wireless/ath/ath11k/mac.c:5369: continue;
}
}
drivers/net/wireless/ath/ath11k/mac.c:5403: continue;
}
}
drivers/net/wireless/ath/ath10k/mac.c:8646: continue;
}
}
drivers/net/wireless/ath/ath10k/mac.c:8687: continue;
}
}
drivers/net/geneve.c:513: continue;
}
}
drivers/net/ethernet/ti/netcp_core.c:331: continue;
}
}
drivers/net/ethernet/neterion/s2io.c:1392: continue;
}
}
drivers/net/ethernet/toshiba/ps3_gelic_wireless.c:1722: continue;
}
}
drivers/net/ethernet/mellanox/mlx5/core/en_tc.c:1633: continue;
}
}
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:9386: continue;
}
}
drivers/target/iscsi/iscsi_target_erl1.c:341: continue;
}
}
drivers/cpufreq/powernow-k8.c:848: continue;
}
}
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c:3179: continue;
}
}
drivers/iommu/intel/iommu.c:3082: continue;
}
}
drivers/soc/ti/knav_qmss_queue.c:724: continue;
}
}
drivers/mmc/host/vub300.c:561: continue;
}
}
drivers/mmc/host/vub300.c:1885: continue;
}
}
drivers/staging/rtl8188eu/core/rtw_efuse.c:552: continue;
}
}
drivers/staging/greybus/audio_helper.c:184: continue;
}
}
drivers/block/rbd.c:2443: continue;
}
}
drivers/clk/sunxi/clk-sun8i-bus-gates.c:89: continue;
}
}
drivers/clk/sunxi/clk-mod0.c:348: continue;
}
}
drivers/pci/controller/pci-hyperv.c:2056: continue;
}
}
drivers/scsi/mvumi.c:1595: continue;
}
}
drivers/scsi/fnic/fnic_fcs.c:654: continue;
}
}
drivers/scsi/qla4xxx/ql4_os.c:2795: continue;
}
}
drivers/scsi/megaraid/megaraid_mm.c:545: continue;
}
}
drivers/scsi/libsas/sas_expander.c:1202: continue;
}
}
drivers/usb/typec/tcpm/tcpm.c:3236: continue;
}
}
drivers/usb/host/fotg210-hcd.c:504: continue;
}
}
drivers/usb/host/ehci-dbg.c:610: continue;
}
}
drivers/usb/host/ohci-at91.c:549: continue;
}
}
drivers/usb/serial/mos7840.c:539: continue;
}
}
drivers/zorro/zorro.c:212: continue;
}
}
drivers/iio/dac/ad5592r-base.c:561: continue;
}
}
drivers/infiniband/hw/hfi1/init.c:1023: continue;
}
}
drivers/char/agp/isoch.c:377: continue;
}
}
drivers/gpu/drm/zte/zx_vou.c:666: continue;
}
}
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c:10133: continue;
}
}
drivers/gpu/drm/nouveau/nvkm/subdev/i2c/base.c:360: continue;
}
}
drivers/tty/serial/jsm/jsm_neo.c:1227: continue;
}
}
drivers/platform/x86/sony-laptop.c:1413: continue;
}
}
drivers/platform/x86/sony-laptop.c:1494: continue;
}
}
drivers/platform/x86/sony-laptop.c:1532: continue;
}
}
drivers/spi/spi-fsi.c:438: continue;
}
} while (seq_state && (seq_state != SPI_FSI_STATUS_SEQ_STATE_IDLE));
drivers/comedi/drivers/ni_usb6501.c:497: continue;
}
}
drivers/comedi/drivers/vmk80xx.c:663: continue;
}
}
drivers/video/fbdev/core/fbcon.c:508: continue;
}
}
drivers/mtd/ubi/block.c:640: continue;
}
}
drivers/mtd/nand/raw/davinci_nand.c:337: continue;
}
}
drivers/mtd/parsers/bcm47xxpart.c:248: continue;
}
}
drivers/nvdimm/badrange.c:158: continue;
}
}
drivers/isdn/hardware/mISDN/hfcsusb.c:1927: continue;
}
}
drivers/input/joystick/grip.c:316: continue;
}
}
drivers/greybus/interface.c:1148: continue;
}
}
drivers/i2c/busses/i2c-powermac.c:366: continue;
}
}
drivers/pinctrl/pinctrl-zynq.c:1101: continue;
}
}
drivers/pinctrl/pinctrl-at91-pio4.c:895: continue;
}
}
drivers/bluetooth/btusb.c:1658: continue;
}
}
drivers/bluetooth/btusb.c:4302: continue;
}
}
drivers/bluetooth/btusb.c:4519: continue;
}
}
drivers/acpi/processor_perflib.c:617: continue;
}
}
drivers/leds/leds-da9052.c:139: continue;
}
}
fs/xfs/libxfs/xfs_sb.c:906: continue;
}
}
fs/9p/v9fs.c:369: continue;
}
}
fs/unicode/mkutf8data.c:1972: continue;
}
}
fs/unicode/mkutf8data.c:2032: continue;
}
}
fs/unicode/mkutf8data.c:2087: continue;
}
}
fs/unicode/mkutf8data.c:2285: continue;
}
}
fs/ocfs2/buffer_head_io.c:332: continue;
}
}
kernel/bpf/syscall.c:3432: continue;
}
}
kernel/range.c:109: continue;
}
}
kernel/trace/trace_events.c:2626: continue;
}
}
lib/test_rhashtable.c:437: continue;
}
}
net/dsa/dsa2.c:831: continue;
}
}
net/wireless/util.c:942: continue;
}
}
net/9p/client.c:214: continue;
}
}
net/9p/trans_fd.c:805: continue;
}
}
net/9p/trans_rdma.c:232: continue;
}
}
net/ipv4/fou.c:422: continue;
}
}
net/ipv4/udp_offload.c:557: continue;
}
}
net/ethernet/eth.c:438: continue;
}
}
net/tipc/name_distr.c:358: continue;
}
}
samples/seccomp/bpf-helper.c:57: continue;
}
}
tools/perf/builtin-script.c:3106: continue;
}
}
tools/perf/util/parse-events.c:505: continue;
}
}
tools/perf/util/jitdump.c:708: continue;
}
}
tools/perf/ui/browsers/hists.c:3543: continue;
}
}
tools/testing/radix-tree/regression3.c:54: continue;
}
}
tools/testing/radix-tree/regression3.c:67: continue;
}
}
tools/testing/selftests/net/mptcp/mptcp_connect.c:371: continue;
}
}
tools/testing/selftests/net/timestamping.c:546: continue;
}
}
tools/testing/selftests/powerpc/nx-gzip/gzip_vas.c:252: continue;
}
}
tools/power/cpupower/lib/cpupower.c:177: continue;
}
}
tools/lib/bpf/libbpf.c:7417: continue;
}
}
tools/lib/bpf/btf.c:928: continue;
}
}
tools/lib/bpf/linker.c:835: continue;
}
}
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