Re: [PATCH v2 10/14] hv: vmbus: pin buffer pages across UIO mmap to close the reclaim race
From: kernel test robot
Date: Thu Oct 08 2026 - 13:03:11 EST
Hi Emerson,
kernel test robot noticed the following build warnings:
[auto build test WARNING on char-misc/char-misc-testing]
[also build test WARNING on char-misc/char-misc-next char-misc/char-misc-linus linus/master v7.3-rc6 next-20261008]
[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/Emerson-Busson/hv-vmbus-convert-ring-backing-through-the-chunk-allocator/20261007-160739
base: char-misc/char-misc-testing
patch link: https://lore.kernel.org/r/20261007190752.336426-11-emersonbusson%40gmail.com
patch subject: [PATCH v2 10/14] hv: vmbus: pin buffer pages across UIO mmap to close the reclaim race
config: i386-randconfig-1013-20261008 (https://download.01.org/0day-ci/archive/20261009/202610090020.wViiihcQ-lkp@xxxxxxxxx/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/20261009/202610090020.wViiihcQ-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202610090020.wViiihcQ-lkp@xxxxxxxxx/
All warnings (new ones prefixed by >>):
In file included from include/linux/dev_printk.h:14,
from include/linux/device.h:15,
from drivers/uio/uio_hv_generic.c:22:
drivers/uio/uio_hv_generic_mmap_test.c: In function 'hv_uio_ring_mmap_range_test':
>> include/linux/limits.h:25:25: warning: conversion from 'long long unsigned int' to 'long unsigned int' changes value from '18446744073709551615' to '4294967295' [-Woverflow]
25 | #define U64_MAX ((u64)~0ULL)
| ^~~~~~~~~~~~
include/linux/compiler.h:76:45: note: in definition of macro 'likely'
76 | # define likely(x) __builtin_expect(!!(x), 1)
| ^
include/kunit/test.h:810:9: note: in expansion of macro 'KUNIT_UNARY_ASSERTION'
810 | KUNIT_UNARY_ASSERTION(test, \
| ^~~~~~~~~~~~~~~~~~~~~
include/kunit/test.h:1017:9: note: in expansion of macro 'KUNIT_FALSE_MSG_ASSERTION'
1017 | KUNIT_FALSE_MSG_ASSERTION(test, \
| ^~~~~~~~~~~~~~~~~~~~~~~~~
include/kunit/test.h:1014:9: note: in expansion of macro 'KUNIT_EXPECT_FALSE_MSG'
1014 | KUNIT_EXPECT_FALSE_MSG(test, condition, NULL)
| ^~~~~~~~~~~~~~~~~~~~~~
drivers/uio/uio_hv_generic_mmap_test.c:35:9: note: in expansion of macro 'KUNIT_EXPECT_FALSE'
35 | KUNIT_EXPECT_FALSE(test,
| ^~~~~~~~~~~~~~~~~~
drivers/uio/uio_hv_generic_mmap_test.c:36:55: note: in expansion of macro 'U64_MAX'
36 | hv_uio_mmap_range_valid(8, U64_MAX, 1));
| ^~~~~~~
vim +25 include/linux/limits.h
3c9d017cc283df Andy Shevchenko 2023-08-04 14
54d50897d544c8 Masahiro Yamada 2019-03-07 15 #define U8_MAX ((u8)~0U)
54d50897d544c8 Masahiro Yamada 2019-03-07 16 #define S8_MAX ((s8)(U8_MAX >> 1))
54d50897d544c8 Masahiro Yamada 2019-03-07 17 #define S8_MIN ((s8)(-S8_MAX - 1))
54d50897d544c8 Masahiro Yamada 2019-03-07 18 #define U16_MAX ((u16)~0U)
54d50897d544c8 Masahiro Yamada 2019-03-07 19 #define S16_MAX ((s16)(U16_MAX >> 1))
54d50897d544c8 Masahiro Yamada 2019-03-07 20 #define S16_MIN ((s16)(-S16_MAX - 1))
54d50897d544c8 Masahiro Yamada 2019-03-07 21 #define U32_MAX ((u32)~0U)
3f50f132d8400e John Fastabend 2020-03-30 22 #define U32_MIN ((u32)0)
54d50897d544c8 Masahiro Yamada 2019-03-07 23 #define S32_MAX ((s32)(U32_MAX >> 1))
54d50897d544c8 Masahiro Yamada 2019-03-07 24 #define S32_MIN ((s32)(-S32_MAX - 1))
54d50897d544c8 Masahiro Yamada 2019-03-07 @25 #define U64_MAX ((u64)~0ULL)
54d50897d544c8 Masahiro Yamada 2019-03-07 26 #define S64_MAX ((s64)(U64_MAX >> 1))
54d50897d544c8 Masahiro Yamada 2019-03-07 27 #define S64_MIN ((s64)(-S64_MAX - 1))
54d50897d544c8 Masahiro Yamada 2019-03-07 28
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