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Message-ID: <202510151252.aKq1qUWF-lkp@intel.com>
Date: Wed, 15 Oct 2025 13:01:10 +0800
From: kernel test robot <lkp@...el.com>
To: Karunika Choo <karunika.choo@....com>, dri-devel@...ts.freedesktop.org
Cc: oe-kbuild-all@...ts.linux.dev, nd@....com,
Boris Brezillon <bbrezillon@...nel.org>,
Steven Price <steven.price@....com>,
Liviu Dudau <liviu.dudau@....com>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 06/10] drm/panthor: Implement L2 power on/off via
PWR_CONTROL
Hi Karunika,
kernel test robot noticed the following build warnings:
[auto build test WARNING on drm-misc/drm-misc-next]
[also build test WARNING on drm/drm-next drm-exynos/exynos-drm-next drm-intel/for-linux-next drm-intel/for-linux-next-fixes drm-tip/drm-tip linus/master v6.18-rc1 next-20251014]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Karunika-Choo/drm-panthor-Factor-out-GPU_ID-register-read-into-separate-function/20251014-174729
base: git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
patch link: https://lore.kernel.org/r/20251014094337.1009601-7-karunika.choo%40arm.com
patch subject: [PATCH v1 06/10] drm/panthor: Implement L2 power on/off via PWR_CONTROL
config: i386-buildonly-randconfig-002-20251015 (https://download.01.org/0day-ci/archive/20251015/202510151252.aKq1qUWF-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251015/202510151252.aKq1qUWF-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202510151252.aKq1qUWF-lkp@intel.com/
All warnings (new ones prefixed by >>):
In file included from drivers/gpu/drm/panthor/panthor_pwr.c:6:
drivers/gpu/drm/panthor/panthor_pwr.c: In function 'panthor_pwr_domain_wait_transition':
>> include/linux/bits.h:49:27: warning: right shift count >= width of type [-Wshift-count-overflow]
49 | type_max(t) >> (BITS_PER_TYPE(t) - 1 - (h)))))
| ^~
include/linux/iopoll.h:145:9: note: in expansion of macro 'poll_timeout_us'
145 | poll_timeout_us((val) = op(args), cond, sleep_us, timeout_us, sleep_before_read)
| ^~~~~~~~~~~~~~~
drivers/gpu/drm/panthor/panthor_device.h:533:9: note: in expansion of macro 'read_poll_timeout'
533 | read_poll_timeout(gpu_read64, val, cond, delay_us, timeout_us, false, \
| ^~~~~~~~~~~~~~~~~
drivers/gpu/drm/panthor/panthor_pwr.c:152:15: note: in expansion of macro 'gpu_read64_poll_timeout'
152 | ret = gpu_read64_poll_timeout(ptdev, pwrtrans_reg, val,
| ^~~~~~~~~~~~~~~~~~~~~~~
include/linux/bits.h:51:33: note: in expansion of macro 'GENMASK_TYPE'
51 | #define GENMASK(h, l) GENMASK_TYPE(unsigned long, h, l)
| ^~~~~~~~~~~~
drivers/gpu/drm/panthor/panthor_pwr.c:26:41: note: in expansion of macro 'GENMASK'
26 | #define PWR_ALL_CORES_MASK GENMASK(63, 0)
| ^~~~~~~
drivers/gpu/drm/panthor/panthor_pwr.c:153:41: note: in expansion of macro 'PWR_ALL_CORES_MASK'
153 | !(PWR_ALL_CORES_MASK & val), 100,
| ^~~~~~~~~~~~~~~~~~
drivers/gpu/drm/panthor/panthor_pwr.c: In function 'retract_domain':
>> include/vdso/bits.h:7:40: warning: left shift count >= width of type [-Wshift-count-overflow]
7 | #define BIT(nr) (UL(1) << (nr))
| ^~
include/linux/iopoll.h:49:21: note: in definition of macro 'poll_timeout_us'
49 | if (cond) { \
| ^~~~
drivers/gpu/drm/panthor/panthor_device.h:533:9: note: in expansion of macro 'read_poll_timeout'
533 | read_poll_timeout(gpu_read64, val, cond, delay_us, timeout_us, false, \
| ^~~~~~~~~~~~~~~~~
drivers/gpu/drm/panthor/panthor_pwr.c:259:15: note: in expansion of macro 'gpu_read64_poll_timeout'
259 | ret = gpu_read64_poll_timeout(ptdev, PWR_STATUS, val,
| ^~~~~~~~~~~~~~~~~~~~~~~
drivers/gpu/drm/panthor/panthor_regs.h:249:57: note: in expansion of macro 'BIT'
249 | #define PWR_STATUS_RETRACT_PENDING BIT(43)
| ^~~
drivers/gpu/drm/panthor/panthor_pwr.c:260:41: note: in expansion of macro 'PWR_STATUS_RETRACT_PENDING'
260 | !(PWR_STATUS_RETRACT_PENDING & val), 0,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
vim +49 include/linux/bits.h
31299a5e021124 Vincent Mailhol 2025-03-26 35
19408200c09485 Vincent Mailhol 2025-03-26 36 /*
19408200c09485 Vincent Mailhol 2025-03-26 37 * Generate a mask for the specified type @t. Additional checks are made to
19408200c09485 Vincent Mailhol 2025-03-26 38 * guarantee the value returned fits in that type, relying on
19408200c09485 Vincent Mailhol 2025-03-26 39 * -Wshift-count-overflow compiler check to detect incompatible arguments.
19408200c09485 Vincent Mailhol 2025-03-26 40 * For example, all these create build errors or warnings:
19408200c09485 Vincent Mailhol 2025-03-26 41 *
19408200c09485 Vincent Mailhol 2025-03-26 42 * - GENMASK(15, 20): wrong argument order
19408200c09485 Vincent Mailhol 2025-03-26 43 * - GENMASK(72, 15): doesn't fit unsigned long
19408200c09485 Vincent Mailhol 2025-03-26 44 * - GENMASK_U32(33, 15): doesn't fit in a u32
19408200c09485 Vincent Mailhol 2025-03-26 45 */
19408200c09485 Vincent Mailhol 2025-03-26 46 #define GENMASK_TYPE(t, h, l) \
19408200c09485 Vincent Mailhol 2025-03-26 47 ((t)(GENMASK_INPUT_CHECK(h, l) + \
19408200c09485 Vincent Mailhol 2025-03-26 48 (type_max(t) << (l) & \
19408200c09485 Vincent Mailhol 2025-03-26 @49 type_max(t) >> (BITS_PER_TYPE(t) - 1 - (h)))))
19408200c09485 Vincent Mailhol 2025-03-26 50
--
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