lib/bitfield_kunit.c:60:20: warning: stack frame size (11392) exceeds limit (8192) in function 'test_bitfields_constants'

From: kernel test robot
Date: Fri Jun 25 2021 - 15:13:15 EST

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 44db63d1ad8d71c6932cbe007eb41f31c434d140
commit: d2585f5164c298aaaed14c2c8d313cbe7bd5b253 lib: kunit: add bitfield test conversion to KUnit
date: 9 months ago
config: riscv-randconfig-r023-20210625 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 9ca0171a9ffdef5fdb1511d197a3fd72490362de)
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=d2585f5164c298aaaed14c2c8d313cbe7bd5b253
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout d2585f5164c298aaaed14c2c8d313cbe7bd5b253
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=riscv

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

All warnings (new ones prefixed by >>):

lib/bitfield_kunit.c:136:21: warning: implicit conversion from 'int' to 'u16' (aka 'unsigned short') changes value from 393216 to 0 [-Wconstant-conversion]
u16_encode_bits(0, 0x60000);
~~~~~~~~~~~~~~~ ^~~~~~~
lib/bitfield_kunit.c:129:20: warning: unused function 'test_bitfields_compile' [-Wunused-function]
static void __init test_bitfields_compile(struct kunit *context)
^
>> lib/bitfield_kunit.c:60:20: warning: stack frame size (11392) exceeds limit (8192) in function 'test_bitfields_constants' [-Wframe-larger-than]
static void __init test_bitfields_constants(struct kunit *context)
^
3 warnings generated.


vim +/test_bitfields_constants +60 lib/bitfield_kunit.c

10
11 #define CHECK_ENC_GET_U(tp, v, field, res) do { \
12 { \
13 u##tp _res; \
14 \
15 _res = u##tp##_encode_bits(v, field); \
16 KUNIT_ASSERT_FALSE_MSG(context, _res != res, \
17 "u" #tp "_encode_bits(" #v ", " #field ") is 0x%llx != " #res "\n", \
18 (u64)_res); \
19 KUNIT_ASSERT_FALSE(context, \
20 u##tp##_get_bits(_res, field) != v); \
21 } \
22 } while (0)
23
24 #define CHECK_ENC_GET_LE(tp, v, field, res) do { \
25 { \
26 __le##tp _res; \
27 \
28 _res = le##tp##_encode_bits(v, field); \
29 KUNIT_ASSERT_FALSE_MSG(context, \
30 _res != cpu_to_le##tp(res), \
31 "le" #tp "_encode_bits(" #v ", " #field ") is 0x%llx != 0x%llx",\
32 (u64)le##tp##_to_cpu(_res), \
33 (u64)(res)); \
34 KUNIT_ASSERT_FALSE(context, \
35 le##tp##_get_bits(_res, field) != v);\
36 } \
37 } while (0)
38
39 #define CHECK_ENC_GET_BE(tp, v, field, res) do { \
40 { \
41 __be##tp _res; \
42 \
43 _res = be##tp##_encode_bits(v, field); \
44 KUNIT_ASSERT_FALSE_MSG(context, \
45 _res != cpu_to_be##tp(res), \
46 "be" #tp "_encode_bits(" #v ", " #field ") is 0x%llx != 0x%llx", \
47 (u64)be##tp##_to_cpu(_res), \
48 (u64)(res)); \
49 KUNIT_ASSERT_FALSE(context, \
50 be##tp##_get_bits(_res, field) != v);\
51 } \
52 } while (0)
53
54 #define CHECK_ENC_GET(tp, v, field, res) do { \
55 CHECK_ENC_GET_U(tp, v, field, res); \
56 CHECK_ENC_GET_LE(tp, v, field, res); \
57 CHECK_ENC_GET_BE(tp, v, field, res); \
58 } while (0)
59
> 60 static void __init test_bitfields_constants(struct kunit *context)
61 {
62 /*
63 * NOTE
64 * This whole function compiles (or at least should, if everything
65 * is going according to plan) to nothing after optimisation.
66 */
67
68 CHECK_ENC_GET(16, 1, 0x000f, 0x0001);
69 CHECK_ENC_GET(16, 3, 0x00f0, 0x0030);
70 CHECK_ENC_GET(16, 5, 0x0f00, 0x0500);
71 CHECK_ENC_GET(16, 7, 0xf000, 0x7000);
72 CHECK_ENC_GET(16, 14, 0x000f, 0x000e);
73 CHECK_ENC_GET(16, 15, 0x00f0, 0x00f0);
74
75 CHECK_ENC_GET_U(8, 1, 0x0f, 0x01);
76 CHECK_ENC_GET_U(8, 3, 0xf0, 0x30);
77 CHECK_ENC_GET_U(8, 14, 0x0f, 0x0e);
78 CHECK_ENC_GET_U(8, 15, 0xf0, 0xf0);
79
80 CHECK_ENC_GET(32, 1, 0x00000f00, 0x00000100);
81 CHECK_ENC_GET(32, 3, 0x0000f000, 0x00003000);
82 CHECK_ENC_GET(32, 5, 0x000f0000, 0x00050000);
83 CHECK_ENC_GET(32, 7, 0x00f00000, 0x00700000);
84 CHECK_ENC_GET(32, 14, 0x0f000000, 0x0e000000);
85 CHECK_ENC_GET(32, 15, 0xf0000000, 0xf0000000);
86
87 CHECK_ENC_GET(64, 1, 0x00000f0000000000ull, 0x0000010000000000ull);
88 CHECK_ENC_GET(64, 3, 0x0000f00000000000ull, 0x0000300000000000ull);
89 CHECK_ENC_GET(64, 5, 0x000f000000000000ull, 0x0005000000000000ull);
90 CHECK_ENC_GET(64, 7, 0x00f0000000000000ull, 0x0070000000000000ull);
91 CHECK_ENC_GET(64, 14, 0x0f00000000000000ull, 0x0e00000000000000ull);
92 CHECK_ENC_GET(64, 15, 0xf000000000000000ull, 0xf000000000000000ull);
93 }
94

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

Attachment: .config.gz
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