drivers/comedi/drivers/adl_pci9111.c:414:2: warning: performing pointer arithmetic on a null pointer has undefined behavior

From: kernel test robot
Date: Wed Feb 01 2023 - 12:42:53 EST

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Hi Maciej,

FYI, the error/warning still remains.

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: c0b67534c95c537f7a506a06b98e5e85d72e2b7d
commit: 9cc205e3c17d5716da7ebb7fa0c985555e95d009 RISC-V: Make port I/O string accessors actually work
date: 4 months ago
config: riscv-randconfig-r022-20230201 (https://download.01.org/0day-ci/archive/20230202/202302020103.JtDCLryg-lkp@xxxxxxxxx/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 4196ca3278f78c6e19246e54ab0ecb364e37d66a)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install riscv cross compiling tool for clang build
# apt-get install binutils-riscv64-linux-gnu
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9cc205e3c17d5716da7ebb7fa0c985555e95d009
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 9cc205e3c17d5716da7ebb7fa0c985555e95d009
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv olddefconfig
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/riscv/include/asm/io.h:136:
include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writeb(value, PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:594:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:604:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:743:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
insb(addr, buffer, count);
^~~~~~~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/io.h:104:53: note: expanded from macro 'insb'
#define insb(addr, buffer, count) __insb(PCI_IOBASE + (addr), buffer, count)
~~~~~~~~~~ ^
In file included from drivers/comedi/drivers/adl_pci9111.c:44:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/riscv/include/asm/io.h:136:
include/asm-generic/io.h:751:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
insw(addr, buffer, count);
^~~~~~~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/io.h:105:53: note: expanded from macro 'insw'
#define insw(addr, buffer, count) __insw(PCI_IOBASE + (addr), buffer, count)
~~~~~~~~~~ ^
In file included from drivers/comedi/drivers/adl_pci9111.c:44:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/riscv/include/asm/io.h:136:
include/asm-generic/io.h:759:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
insl(addr, buffer, count);
^~~~~~~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/io.h:106:53: note: expanded from macro 'insl'
#define insl(addr, buffer, count) __insl(PCI_IOBASE + (addr), buffer, count)
~~~~~~~~~~ ^
In file included from drivers/comedi/drivers/adl_pci9111.c:44:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/riscv/include/asm/io.h:136:
include/asm-generic/io.h:768:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
outsb(addr, buffer, count);
^~~~~~~~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/io.h:118:55: note: expanded from macro 'outsb'
#define outsb(addr, buffer, count) __outsb(PCI_IOBASE + (addr), buffer, count)
~~~~~~~~~~ ^
In file included from drivers/comedi/drivers/adl_pci9111.c:44:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/riscv/include/asm/io.h:136:
include/asm-generic/io.h:777:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
outsw(addr, buffer, count);
^~~~~~~~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/io.h:119:55: note: expanded from macro 'outsw'
#define outsw(addr, buffer, count) __outsw(PCI_IOBASE + (addr), buffer, count)
~~~~~~~~~~ ^
In file included from drivers/comedi/drivers/adl_pci9111.c:44:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/riscv/include/asm/io.h:136:
include/asm-generic/io.h:786:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
outsl(addr, buffer, count);
^~~~~~~~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/io.h:120:55: note: expanded from macro 'outsl'
#define outsl(addr, buffer, count) __outsl(PCI_IOBASE + (addr), buffer, count)
~~~~~~~~~~ ^
In file included from drivers/comedi/drivers/adl_pci9111.c:44:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/riscv/include/asm/io.h:136:
include/asm-generic/io.h:1134:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port;
~~~~~~~~~~ ^
>> drivers/comedi/drivers/adl_pci9111.c:414:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
insw(dev->iobase + PCI9111_AI_FIFO_REG, buf, samples);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/io.h:105:53: note: expanded from macro 'insw'
#define insw(addr, buffer, count) __insw(PCI_IOBASE + (addr), buffer, count)
~~~~~~~~~~ ^
14 warnings generated.
--
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/riscv/include/asm/io.h:136:
include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writeb(value, PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:594:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:604:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:743:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
insb(addr, buffer, count);
^~~~~~~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/io.h:104:53: note: expanded from macro 'insb'
#define insb(addr, buffer, count) __insb(PCI_IOBASE + (addr), buffer, count)
~~~~~~~~~~ ^
In file included from drivers/comedi/drivers/cb_pcidas.c:56:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/riscv/include/asm/io.h:136:
include/asm-generic/io.h:751:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
insw(addr, buffer, count);
^~~~~~~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/io.h:105:53: note: expanded from macro 'insw'
#define insw(addr, buffer, count) __insw(PCI_IOBASE + (addr), buffer, count)
~~~~~~~~~~ ^
In file included from drivers/comedi/drivers/cb_pcidas.c:56:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/riscv/include/asm/io.h:136:
include/asm-generic/io.h:759:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
insl(addr, buffer, count);
^~~~~~~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/io.h:106:53: note: expanded from macro 'insl'
#define insl(addr, buffer, count) __insl(PCI_IOBASE + (addr), buffer, count)
~~~~~~~~~~ ^
In file included from drivers/comedi/drivers/cb_pcidas.c:56:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/riscv/include/asm/io.h:136:
include/asm-generic/io.h:768:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
outsb(addr, buffer, count);
^~~~~~~~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/io.h:118:55: note: expanded from macro 'outsb'
#define outsb(addr, buffer, count) __outsb(PCI_IOBASE + (addr), buffer, count)
~~~~~~~~~~ ^
In file included from drivers/comedi/drivers/cb_pcidas.c:56:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/riscv/include/asm/io.h:136:
include/asm-generic/io.h:777:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
outsw(addr, buffer, count);
^~~~~~~~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/io.h:119:55: note: expanded from macro 'outsw'
#define outsw(addr, buffer, count) __outsw(PCI_IOBASE + (addr), buffer, count)
~~~~~~~~~~ ^
In file included from drivers/comedi/drivers/cb_pcidas.c:56:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/riscv/include/asm/io.h:136:
include/asm-generic/io.h:786:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
outsl(addr, buffer, count);
^~~~~~~~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/io.h:120:55: note: expanded from macro 'outsl'
#define outsl(addr, buffer, count) __outsl(PCI_IOBASE + (addr), buffer, count)
~~~~~~~~~~ ^
In file included from drivers/comedi/drivers/cb_pcidas.c:56:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/riscv/include/asm/io.h:136:
include/asm-generic/io.h:1134:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port;
~~~~~~~~~~ ^
>> drivers/comedi/drivers/cb_pcidas.c:991:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
outsw(devpriv->pcibar4 + PCIDAS_AO_FIFO_REG,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/io.h:119:55: note: expanded from macro 'outsw'
#define outsw(addr, buffer, count) __outsw(PCI_IOBASE + (addr), buffer, count)
~~~~~~~~~~ ^
drivers/comedi/drivers/cb_pcidas.c:1153:3: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
insw(devpriv->pcibar2 + PCIDAS_AI_DATA_REG,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/io.h:105:53: note: expanded from macro 'insw'
#define insw(addr, buffer, count) __insw(PCI_IOBASE + (addr), buffer, count)
~~~~~~~~~~ ^
15 warnings generated.

vim +414 drivers/comedi/drivers/adl_pci9111.c

8cb9b9fb975476 drivers/staging/comedi/drivers/adl_pci9111.c Emmanuel Pacaud 2009-02-12 404
9a8805bb80cff9 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2014-05-27 405 static void pci9111_handle_fifo_half_full(struct comedi_device *dev,
9a8805bb80cff9 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2014-05-27 406 struct comedi_subdevice *s)
9a8805bb80cff9 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2014-05-27 407 {
9a8805bb80cff9 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2014-05-27 408 struct pci9111_private_data *devpriv = dev->private;
9a8805bb80cff9 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2014-05-27 409 struct comedi_cmd *cmd = &s->async->cmd;
64a4e72eabd419 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2015-10-12 410 unsigned short *buf = devpriv->ai_bounce_buffer;
9a8805bb80cff9 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2014-05-27 411 unsigned int samples;
9a8805bb80cff9 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2014-05-27 412
b6bc224f33b2d2 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2014-11-10 413 samples = comedi_nsamples_left(s, PCI9111_FIFO_HALF_SIZE);
64a4e72eabd419 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2015-10-12 @414 insw(dev->iobase + PCI9111_AI_FIFO_REG, buf, samples);
9a8805bb80cff9 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2014-05-27 415
9a8805bb80cff9 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2014-05-27 416 if (devpriv->scan_delay < 1) {
64a4e72eabd419 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2015-10-12 417 comedi_buf_write_samples(s, buf, samples);
9a8805bb80cff9 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2014-05-27 418 } else {
9a8805bb80cff9 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2014-05-27 419 unsigned int pos = 0;
9a8805bb80cff9 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2014-05-27 420 unsigned int to_read;
9a8805bb80cff9 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2014-05-27 421
9a8805bb80cff9 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2014-05-27 422 while (pos < samples) {
9a8805bb80cff9 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2014-05-27 423 if (devpriv->chunk_counter < cmd->chanlist_len) {
9a8805bb80cff9 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2014-05-27 424 to_read = cmd->chanlist_len -
9a8805bb80cff9 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2014-05-27 425 devpriv->chunk_counter;
9a8805bb80cff9 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2014-05-27 426
9a8805bb80cff9 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2014-05-27 427 if (to_read > samples - pos)
9a8805bb80cff9 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2014-05-27 428 to_read = samples - pos;
9a8805bb80cff9 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2014-05-27 429
64a4e72eabd419 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2015-10-12 430 comedi_buf_write_samples(s, buf + pos, to_read);
9a8805bb80cff9 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2014-05-27 431 } else {
9a8805bb80cff9 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2014-05-27 432 to_read = devpriv->chunk_num_samples -
9a8805bb80cff9 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2014-05-27 433 devpriv->chunk_counter;
9a8805bb80cff9 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2014-05-27 434
9a8805bb80cff9 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2014-05-27 435 if (to_read > samples - pos)
9a8805bb80cff9 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2014-05-27 436 to_read = samples - pos;
9a8805bb80cff9 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2014-05-27 437 }
9a8805bb80cff9 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2014-05-27 438
9a8805bb80cff9 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2014-05-27 439 pos += to_read;
9a8805bb80cff9 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2014-05-27 440 devpriv->chunk_counter += to_read;
9a8805bb80cff9 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2014-05-27 441
9a8805bb80cff9 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2014-05-27 442 if (devpriv->chunk_counter >=
9a8805bb80cff9 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2014-05-27 443 devpriv->chunk_num_samples)
9a8805bb80cff9 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2014-05-27 444 devpriv->chunk_counter = 0;
9a8805bb80cff9 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2014-05-27 445 }
9a8805bb80cff9 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2014-05-27 446 }
9a8805bb80cff9 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2014-05-27 447 }
9a8805bb80cff9 drivers/staging/comedi/drivers/adl_pci9111.c H Hartley Sweeten 2014-05-27 448

:::::: The code at line 414 was first introduced by commit
:::::: 64a4e72eabd4199d6897f8b1366479b1b8152228 staging: comedi: adl_pci9111: fix alignment issue

:::::: TO: H Hartley Sweeten <hsweeten@xxxxxxxxxxxxxxxxxxx>
:::::: CC: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests

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