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SubjectRe: [PATCH v3 4/4] arm: kexec_file: load zImage or uImage, initrd and dtb
Hi "Łukasz,

I love your patch! Perhaps something to improve:

[auto build test WARNING on next-20200930]
[cannot apply to arm/for-next v5.9-rc7 v5.9-rc6 v5.9-rc5 v5.9-rc7]
[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]

url: https://github.com/0day-ci/linux/commits/ukasz-Stelmach/kexec_file_load-for-arm/20201001-024045
base: de69ee6df1cfbf3c67787d8504fd21b59da39572
config: arm-allyesconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0
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
# https://github.com/0day-ci/linux/commit/9a7741b76697140672aba84338463032c1fc9fb8
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review ukasz-Stelmach/kexec_file_load-for-arm/20201001-024045
git checkout 9a7741b76697140672aba84338463032c1fc9fb8
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm

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

All warnings (new ones prefixed by >>):

arch/arm/kernel/kexec_zimage.c: In function 'zimage_load':
>> arch/arm/kernel/kexec_zimage.c:89:28: warning: variable 'h' set but not used [-Wunused-but-set-variable]
89 | struct arm_zimage_header *h;
| ^

vim +/h +89 arch/arm/kernel/kexec_zimage.c

83
84 static void *zimage_load(struct kimage *image,
85 char *zimage, unsigned long zimage_len,
86 char *initrd, unsigned long initrd_len,
87 char *cmdline, unsigned long cmdline_len)
88 {
> 89 struct arm_zimage_header *h;
90 struct kexec_buf kbuf;
91 struct kexec_segment *zimage_segment;
92 const struct arm_zimage_tag *tag;
93 int ret = -EINVAL;
94
95 unsigned long zimage_mem = 0x20000; /* malloc 64kB + stack 4 kB + some bss */
96 unsigned long kernel_len = zimage_len * 5; /* 5:1 compression */
97 unsigned long kernel_offset = memblock_start_of_DRAM();
98 unsigned long zimage_offset = kernel_offset +
99 ALIGN(kernel_len, PAGE_SIZE);
100 unsigned long initrd_offset = zimage_offset +
101 ALIGN(zimage_len + zimage_mem, PAGE_SIZE);
102
103 if (image->type == KEXEC_TYPE_CRASH) {
104 kernel_offset += crashk_res.start;
105 zimage_offset += crashk_res.start;
106 initrd_offset += crashk_res.start;
107 }
108 debug_offsets();
109
110 h = (struct arm_zimage_header *)zimage;
111
112 tag = find_extension_tag(zimage, zimage_len, ZIMAGE_TAG_KRNL_SIZE);
113 if (tag) {
114 uint32_t *p = (void *)zimage +
115 le32_to_cpu(tag->u.krnl_size.size_ptr);
116 uint32_t edata_size = le32_to_cpu(get_unaligned(p));
117 uint32_t bss_size = le32_to_cpu(tag->u.krnl_size.bss_size);
118 uint32_t text_offset = le32_to_cpu(tag->u.krnl_size.text_offset);
119
120 kernel_offset += ALIGN(text_offset, PAGE_SIZE);
121 kernel_len = edata_size + bss_size;
122
123 pr_debug("Decompressed kernel sizes:\n");
124 pr_debug(" text+data 0x%08lx bss 0x%08lx total 0x%08lx\n",
125 (unsigned long)edata_size,
126 (unsigned long)bss_size,
127 (unsigned long)kernel_len);
128
129 zimage_offset = kernel_offset + ALIGN(edata_size, PAGE_SIZE);
130 initrd_offset = zimage_offset +
131 max(ALIGN(zimage_len + 0x20000, PAGE_SIZE),
132 ALIGN((unsigned long)bss_size, PAGE_SIZE));
133 debug_offsets();
134 }
135
136 tag = find_extension_tag(zimage, zimage_len,
137 ZIMAGE_TAG_ZIMAGE_MEM);
138 if (tag) {
139 uint32_t zimage_mem = le32_to_cpu(tag->u.zimage_mem);
140
141 pr_debug("Decompressor requires %d bytes of memory\n", zimage_mem);
142
143 initrd_offset = max(ALIGN(zimage_offset + zimage_len + zimage_mem, PAGE_SIZE),
144 ALIGN(kernel_offset + kernel_len, PAGE_SIZE));
145 debug_offsets();
146 }
147
148 /*
149 * zImage MUST be loaded into the first 128 MiB of physical
150 * memory for proper memory detection. Should the uncompressed
151 * kernel be larger than 128 MiB, zImage relocation becomes
152 * unavoidable and it is best to rely on the relocation code.
153 */
154 if (((zimage_offset - kernel_offset) + PAGE_SIZE + 0x8000) >= SZ_128M) {
155 pr_debug("The kernel is too big (%ld MiB) to avoid "
156 "zImage relocation. Loading zimage at 0x%08lx\n",
157 ((zimage_offset - kernel_offset) >> 20),
158 kernel_offset);
159 zimage_offset = kernel_offset;
160 }
161
162 kbuf.image = image;
163 kbuf.top_down = false;
164
165 kbuf.buf_min = zimage_offset;
166 kbuf.buf_max = ULONG_MAX;
167 kbuf.buffer = zimage;
168 kbuf.bufsz = zimage_len;
169 kbuf.buf_align = PAGE_SIZE;
170
171 kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
172 kbuf.memsz = zimage_len;
173
174 ret = kexec_add_buffer(&kbuf);
175 if (ret)
176 return ERR_PTR(ret);
177
178 pr_debug("Loaded zImage at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
179 kbuf.mem, kbuf.bufsz, kbuf.memsz);
180
181 initrd_offset += kbuf.mem - zimage_offset;
182 debug_offsets();
183
184 zimage_segment = &image->segment[image->nr_segments - 1];
185 image->start = zimage_segment->mem;
186
187 ret = load_other_segments(image,
188 zimage_segment->mem, zimage_segment->memsz,
189 initrd, initrd_len, initrd_offset,
190 cmdline);
191 return ERR_PTR(ret);
192 }
193

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