arch/powerpc/kvm/test-guest-state-buffer.c:70:25: sparse: sparse: restricted __be64 degrades to integer
From: kernel test robot
Date: Tue Dec 26 2023 - 19:53:19 EST
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: fbafc3e621c3f4ded43720fdb1d6ce1728ec664e
commit: 6ccbbc33f06adaf79acde18571c6543ad1cb4be6 KVM: PPC: Add helper library for Guest State Buffers
date: 3 months ago
config: powerpc64-randconfig-r131-20231227 (https://download.01.org/0day-ci/archive/20231227/202312270830.t3f9Plc5-lkp@xxxxxxxxx/config)
compiler: powerpc64-linux-gcc (GCC) 13.2.0
reproduce: (https://download.01.org/0day-ci/archive/20231227/202312270830.t3f9Plc5-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/202312270830.t3f9Plc5-lkp@xxxxxxxxx/
sparse warnings: (new ones prefixed by >>)
>> arch/powerpc/kvm/test-guest-state-buffer.c:70:25: sparse: sparse: restricted __be64 degrades to integer
>> arch/powerpc/kvm/test-guest-state-buffer.c:70:25: sparse: sparse: incorrect type in initializer (different base types) @@ expected long long left_value @@ got restricted __be64 const __left @@
arch/powerpc/kvm/test-guest-state-buffer.c:70:25: sparse: expected long long left_value
arch/powerpc/kvm/test-guest-state-buffer.c:70:25: sparse: got restricted __be64 const __left
arch/powerpc/kvm/test-guest-state-buffer.c: note: in included file (through include/linux/mmzone.h, include/linux/gfp.h, include/linux/umh.h, include/linux/kmod.h, ...):
include/linux/page-flags.h:242:46: sparse: sparse: self-comparison always evaluates to false
vim +70 arch/powerpc/kvm/test-guest-state-buffer.c
24
25 static void test_adding_element(struct kunit *test)
26 {
27 const struct kvmppc_gs_elem *head, *curr;
28 union {
29 __vector128 v;
30 u64 dw[2];
31 } u;
32 int rem;
33 struct kvmppc_gs_buff *gsb;
34 size_t size = 0x1000;
35 int i, rc;
36 u64 data;
37
38 gsb = kvmppc_gsb_new(size, 0, 0, GFP_KERNEL);
39 KUNIT_ASSERT_NOT_ERR_OR_NULL(test, gsb);
40
41 /* Single elements, direct use of __kvmppc_gse_put() */
42 data = 0xdeadbeef;
43 rc = __kvmppc_gse_put(gsb, KVMPPC_GSID_GPR(0), 8, &data);
44 KUNIT_EXPECT_GE(test, rc, 0);
45
46 head = kvmppc_gsb_data(gsb);
47 KUNIT_EXPECT_EQ(test, kvmppc_gse_iden(head), KVMPPC_GSID_GPR(0));
48 KUNIT_EXPECT_EQ(test, kvmppc_gse_len(head), 8);
49 data = 0;
50 memcpy(&data, kvmppc_gse_data(head), 8);
51 KUNIT_EXPECT_EQ(test, data, 0xdeadbeef);
52
53 /* Multiple elements, simple wrapper */
54 rc = kvmppc_gse_put_u64(gsb, KVMPPC_GSID_GPR(1), 0xcafef00d);
55 KUNIT_EXPECT_GE(test, rc, 0);
56
57 u.dw[0] = 0x1;
58 u.dw[1] = 0x2;
59 rc = kvmppc_gse_put_vector128(gsb, KVMPPC_GSID_VSRS(0), &u.v);
60 KUNIT_EXPECT_GE(test, rc, 0);
61 u.dw[0] = 0x0;
62 u.dw[1] = 0x0;
63
64 kvmppc_gsb_for_each_elem(i, curr, gsb, rem) {
65 switch (i) {
66 case 0:
67 KUNIT_EXPECT_EQ(test, kvmppc_gse_iden(curr),
68 KVMPPC_GSID_GPR(0));
69 KUNIT_EXPECT_EQ(test, kvmppc_gse_len(curr), 8);
> 70 KUNIT_EXPECT_EQ(test, kvmppc_gse_get_be64(curr),
71 0xdeadbeef);
72 break;
73 case 1:
74 KUNIT_EXPECT_EQ(test, kvmppc_gse_iden(curr),
75 KVMPPC_GSID_GPR(1));
76 KUNIT_EXPECT_EQ(test, kvmppc_gse_len(curr), 8);
77 KUNIT_EXPECT_EQ(test, kvmppc_gse_get_u64(curr),
78 0xcafef00d);
79 break;
80 case 2:
81 KUNIT_EXPECT_EQ(test, kvmppc_gse_iden(curr),
82 KVMPPC_GSID_VSRS(0));
83 KUNIT_EXPECT_EQ(test, kvmppc_gse_len(curr), 16);
84 kvmppc_gse_get_vector128(curr, &u.v);
85 KUNIT_EXPECT_EQ(test, u.dw[0], 0x1);
86 KUNIT_EXPECT_EQ(test, u.dw[1], 0x2);
87 break;
88 }
89 }
90 KUNIT_EXPECT_EQ(test, i, 3);
91
92 kvmppc_gsb_reset(gsb);
93 KUNIT_EXPECT_EQ(test, kvmppc_gsb_nelems(gsb), 0);
94 KUNIT_EXPECT_EQ(test, kvmppc_gsb_len(gsb),
95 sizeof(struct kvmppc_gs_header));
96
97 kvmppc_gsb_free(gsb);
98 }
99
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