My Experiences as a Kernel Contributor by Arvind Yadav
This insightful journey unveils Arvind Yadav's experiences as a kernel contributor, highlighting the process, guidelines, and contributions within the kernel development community. From beginner insights to significant contributions, delve into the world of open-source collaboration through Arvind's narrative.
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My Experiences as a Kernel Contributor By Arvind Yadav arvind.Yadav.cs@gmail.com
AGENDA My Experience as a Beginner Snippets about other contributors Every Bit Matters My Contribution Process Guidelines Q&A
MY EXPERIENCES AS A BEGINNER How it all started How I got my first patch Learnings from my failures
SNIPPET ABOUT OTHER CONTRIBUTORS His major contribution deals with Coverty tool generated issues He has 1000+ patches under his name Gusto A R Silva
SNIPPET ABOUT OTHER CONTRIBUTORS Her major contribution lies in the area of constify data operations and methods She has gained 500+ patches under her name Bhumika Goyal
Allen Pais Kees Cook Both have contributed under Convert timers to use timer_setup() and setup_timer() Allen has contributed over 100+ patches in the current cycle Kees Cook has been one of the major contributors with 1000+ patches under his name
SNIPPET ABOUT OTHER CONTRIBUTORS His major contribution lies in the area of fixing checkpatch error and code cleanup He has over 1000+ patches under his name Markus Elfring
EVERY BIT MATTERS The Typo that destroyed the NASA Rocket Heart Bleed Error AT&T Network Goes Down Day of the dead living
MY CONTRIBUTIONS CONSTIFY DEVICE ID / ATTRIBUTE ERROR HANDLING OR TAKING CARE OF RETURN VALUES MEMORY / CLOCK RELEASES CODE CLEANUP COMPILATION WARNING CHECKPATCH ERROR BUG FIXING
BUG FIXING kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN Modules linked in: CPU: 1 PID: 1497 Comm: kworker/1:1 Not tainted 4.14.0-rc4-43418-g43a3f84d2109-dirty #380 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 Workqueue: usb_hub_wq hub_event task: ffff88006a5618c0 task.stack: ffff880068bc8000 RIP: 0010:imon_probe+0x231/0x3f10 drivers/media/rc/imon.c:2519 RSP: 0018:ffff880068bce2d8 EFLAGS: 00010206 RAX: 0000000000000000 RBX: ffff8800627dd500 RCX: 0000000000000027 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000138 RBP: ffff880068bce5e8 R08: ffff88006a5618c0 R09: ffffffff84b380fc R10: ffff880068bce2c8 R11: 1ffff1000d4ac5b3 R12: ffff880061830000 R13: ffff880061830008 R14: ffffffff883fa200 R15: ffffffff883fa080 FS: 0000000000000000(0000) GS:ffff88006c500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000206cbffc CR3: 0000000061085000 CR4: 00000000000006e0 Call Trace: usb_probe_interface+0x35d/0x8e0 drivers/usb/core/driver.c:361 really_probe drivers/base/dd.c:413 driver_probe_device+0x610/0xa00 drivers/base/dd.c:557 __device_attach_driver+0x230/0x290 drivers/base/dd.c:653 bus_for_each_drv+0x161/0x210 drivers/base/bus.c:463 __device_attach+0x26e/0x3d0 drivers/base/dd.c:710 device_initial_probe+0x1f/0x30 drivers/base/dd.c:757 bus_probe_device+0x1eb/0x290 drivers/base/bus.c:523 device_add+0xd0b/0x1660 drivers/base/core.c:1835 usb_set_configuration+0x104e/0x1870 drivers/usb/core/message.c:1932 generic_probe+0x73/0xe0 drivers/usb/core/generic.c:174 usb_probe_device+0xaf/0xe0 drivers/usb/core/driver.c:266 really_probe drivers/base/dd.c:413 driver_probe_device+0x610/0xa00 drivers/base/dd.c:557 __device_attach_driver+0x230/0x290 drivers/base/dd.c:653 bus_for_each_drv+0x161/0x210 drivers/base/bus.c:463 __device_attach+0x26e/0x3d0 drivers/base/dd.c:710 device_initial_probe+0x1f/0x30 drivers/base/dd.c:757 bus_probe_device+0x1eb/0x290 drivers/base/bus.c:523 device_add+0xd0b/0x1660 drivers/base/core.c:1835 usb_new_device+0x7b8/0x1020 drivers/usb/core/hub.c:2457 hub_port_connect drivers/usb/core/hub.c:4903 hub_port_connect_change drivers/usb/core/hub.c:5009 port_event drivers/usb/core/hub.c:5115 hub_event+0x194d/0x3740 drivers/usb/core/hub.c:5195 process_one_work+0xc7f/0x1db0 kernel/workqueue.c:2119 worker_thread+0x221/0x1850 kernel/workqueue.c:2253 kthread+0x3a1/0x470 kernel/kthread.c:231 ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431 Code: ff e8 a4 81 cb 01 31 f6 48 89 df e8 2a cc 65 ff 0f ae f0 48 8d b8 38 01 00 00 48 ba 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 <80>
BUG FIXING Contd INFO: trying to register non-static key. the code is fine but needs lockdep annotation. turning off the locking correctness validator. CPU: 0 PID: 24 Comm: kworker/0:1 Not tainted 4.14.0-rc1-42251-gebb2c2437d80 #215 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 Workqueue: usb_hub_wq hub_event Call Trace: __dump_stack lib/dump_stack.c:16 dump_stack+0x292/0x395 lib/dump_stack.c:52 register_lock_class+0x6c4/0x1a00 kernel/locking/lockdep.c:769 __lock_acquire+0x27e/0x4550 kernel/locking/lockdep.c:3385 lock_acquire+0x259/0x620 kernel/locking/lockdep.c:4002 flush_work+0xf0/0x8c0 kernel/workqueue.c:2886 hdpvr_probe+0x233/0x20d0 drivers/media/usb/hdpvr/hdpvr-core.c:400 usb_probe_interface+0x35d/0x8e0 drivers/usb/core/driver.c:361 really_probe drivers/base/dd.c:413 driver_probe_device+0x610/0xa00 drivers/base/dd.c:557 __device_attach_driver+0x230/0x290 drivers/base/dd.c:653 bus_for_each_drv+0x161/0x210 drivers/base/bus.c:463 __device_attach+0x26e/0x3d0 drivers/base/dd.c:710 device_initial_probe+0x1f/0x30 drivers/base/dd.c:757 bus_probe_device+0x1eb/0x290 drivers/base/bus.c:523 device_add+0xd0b/0x1660 drivers/base/core.c:1835 usb_set_configuration+0x104e/0x1870 drivers/usb/core/message.c:1932 generic_probe+0x73/0xe0 drivers/usb/core/generic.c:174 usb_probe_device+0xaf/0xe0 drivers/usb/core/driver.c:266 really_probe drivers/base/dd.c:413 driver_probe_device+0x610/0xa00 drivers/base/dd.c:557 __device_attach_driver+0x230/0x290 drivers/base/dd.c:653 bus_for_each_drv+0x161/0x210 drivers/base/bus.c:463 __device_attach+0x26e/0x3d0 drivers/base/dd.c:710 device_initial_probe+0x1f/0x30 drivers/base/dd.c:757 bus_probe_device+0x1eb/0x290 drivers/base/bus.c:523 device_add+0xd0b/0x1660 drivers/base/core.c:1835 usb_new_device+0x7b8/0x1020 drivers/usb/core/hub.c:2457 hub_port_connect drivers/usb/core/hub.c:4903 hub_port_connect_change drivers/usb/core/hub.c:5009 port_event drivers/usb/core/hub.c:5115 hub_event+0x194d/0x3740 drivers/usb/core/hub.c:5195 process_one_work+0xc7f/0x1db0 kernel/workqueue.c:2119 worker_thread+0x221/0x1850 kernel/workqueue.c:2253 kthread+0x3a1/0x470 kernel/kthread.c:231 ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431
PROCESS GUIDELINES Learn GIT Learn how to build a module/kernel Read the following documents several times Documents/HowTo Documents/CodingStyle Use checkPatch.pl and getMaintainer.pl Subject and Description should align the proper domain/ subsystem
