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Date: Tue, 7 Nov 2023 09:41:47 +0800
From: kernel test robot <lkp@...el.com>
To: Zhimin Gu <kookoo.gu@...el.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
"Rafael J. Wysocki" <rjw@...ysocki.net>,
Chen Yu <yu.c.chen@...el.com>
Subject: arch/x86/power/hibernate.c:46: warning: Function parameter or member
'pfn' not described in 'pfn_is_nosave'
Hi Zhimin,
FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant.
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: be3ca57cfb777ad820c6659d52e60bbdd36bf5ff
commit: 25862a049e6f04cc982f4bed25ed3e6f0a0a5a61 x86, hibernate: Extract the common code of 64/32 bit system
date: 5 years ago
config: x86_64-randconfig-r011-20230712 (https://download.01.org/0day-ci/archive/20231107/202311070957.GrEjtFym-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231107/202311070957.GrEjtFym-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/202311070957.GrEjtFym-lkp@intel.com/
All warnings (new ones prefixed by >>):
arch/x86/power/hibernate.c:45:5: warning: no previous prototype for 'pfn_is_nosave' [-Wmissing-prototypes]
45 | int pfn_is_nosave(unsigned long pfn)
| ^~~~~~~~~~~~~
arch/x86/power/hibernate.c:150:5: warning: no previous prototype for 'arch_hibernation_header_save' [-Wmissing-prototypes]
150 | int arch_hibernation_header_save(void *addr, unsigned int max_size)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/x86/power/hibernate.c:187:5: warning: no previous prototype for 'arch_hibernation_header_restore' [-Wmissing-prototypes]
187 | int arch_hibernation_header_restore(void *addr)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> arch/x86/power/hibernate.c:46: warning: Function parameter or member 'pfn' not described in 'pfn_is_nosave'
>> arch/x86/power/hibernate.c:151: warning: Function parameter or member 'max_size' not described in 'arch_hibernation_header_save'
arch/x86/power/hibernate.o: warning: objtool: arch_hibernation_header_restore()+0x31: sibling call from callable instruction with modified stack frame
vim +46 arch/x86/power/hibernate.c
41
42 /**
43 * pfn_is_nosave - check if given pfn is in the 'nosave' section
44 */
45 int pfn_is_nosave(unsigned long pfn)
> 46 {
47 unsigned long nosave_begin_pfn;
48 unsigned long nosave_end_pfn;
49
50 nosave_begin_pfn = __pa_symbol(&__nosave_begin) >> PAGE_SHIFT;
51 nosave_end_pfn = PAGE_ALIGN(__pa_symbol(&__nosave_end)) >> PAGE_SHIFT;
52
53 return pfn >= nosave_begin_pfn && pfn < nosave_end_pfn;
54 }
55
56 #ifdef CONFIG_X86_64
57
58 #define MD5_DIGEST_SIZE 16
59
60 struct restore_data_record {
61 unsigned long jump_address;
62 unsigned long jump_address_phys;
63 unsigned long cr3;
64 unsigned long magic;
65 u8 e820_digest[MD5_DIGEST_SIZE];
66 };
67
68 #if IS_BUILTIN(CONFIG_CRYPTO_MD5)
69 /**
70 * get_e820_md5 - calculate md5 according to given e820 table
71 *
72 * @table: the e820 table to be calculated
73 * @buf: the md5 result to be stored to
74 */
75 static int get_e820_md5(struct e820_table *table, void *buf)
76 {
77 struct crypto_shash *tfm;
78 struct shash_desc *desc;
79 int size;
80 int ret = 0;
81
82 tfm = crypto_alloc_shash("md5", 0, 0);
83 if (IS_ERR(tfm))
84 return -ENOMEM;
85
86 desc = kmalloc(sizeof(struct shash_desc) + crypto_shash_descsize(tfm),
87 GFP_KERNEL);
88 if (!desc) {
89 ret = -ENOMEM;
90 goto free_tfm;
91 }
92
93 desc->tfm = tfm;
94 desc->flags = 0;
95
96 size = offsetof(struct e820_table, entries) +
97 sizeof(struct e820_entry) * table->nr_entries;
98
99 if (crypto_shash_digest(desc, (u8 *)table, size, buf))
100 ret = -EINVAL;
101
102 kzfree(desc);
103
104 free_tfm:
105 crypto_free_shash(tfm);
106 return ret;
107 }
108
109 static int hibernation_e820_save(void *buf)
110 {
111 return get_e820_md5(e820_table_firmware, buf);
112 }
113
114 static bool hibernation_e820_mismatch(void *buf)
115 {
116 int ret;
117 u8 result[MD5_DIGEST_SIZE];
118
119 memset(result, 0, MD5_DIGEST_SIZE);
120 /* If there is no digest in suspend kernel, let it go. */
121 if (!memcmp(result, buf, MD5_DIGEST_SIZE))
122 return false;
123
124 ret = get_e820_md5(e820_table_firmware, result);
125 if (ret)
126 return true;
127
128 return memcmp(result, buf, MD5_DIGEST_SIZE) ? true : false;
129 }
130 #else
131 static int hibernation_e820_save(void *buf)
132 {
133 return 0;
134 }
135
136 static bool hibernation_e820_mismatch(void *buf)
137 {
138 /* If md5 is not builtin for restore kernel, let it go. */
139 return false;
140 }
141 #endif
142
143 #define RESTORE_MAGIC 0x23456789ABCDEF01UL
144
145 /**
146 * arch_hibernation_header_save - populate the architecture specific part
147 * of a hibernation image header
148 * @addr: address to save the data at
149 */
150 int arch_hibernation_header_save(void *addr, unsigned int max_size)
> 151 {
152 struct restore_data_record *rdr = addr;
153
154 if (max_size < sizeof(struct restore_data_record))
155 return -EOVERFLOW;
156 rdr->magic = RESTORE_MAGIC;
157 rdr->jump_address = (unsigned long)restore_registers;
158 rdr->jump_address_phys = __pa_symbol(restore_registers);
159
160 /*
161 * The restore code fixes up CR3 and CR4 in the following sequence:
162 *
163 * [in hibernation asm]
164 * 1. CR3 <= temporary page tables
165 * 2. CR4 <= mmu_cr4_features (from the kernel that restores us)
166 * 3. CR3 <= rdr->cr3
167 * 4. CR4 <= mmu_cr4_features (from us, i.e. the image kernel)
168 * [in restore_processor_state()]
169 * 5. CR4 <= saved CR4
170 * 6. CR3 <= saved CR3
171 *
172 * Our mmu_cr4_features has CR4.PCIDE=0, and toggling
173 * CR4.PCIDE while CR3's PCID bits are nonzero is illegal, so
174 * rdr->cr3 needs to point to valid page tables but must not
175 * have any of the PCID bits set.
176 */
177 rdr->cr3 = restore_cr3 & ~CR3_PCID_MASK;
178
179 return hibernation_e820_save(rdr->e820_digest);
180 }
181
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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