Hi Joe,
It's probably a bug fix that unveils the link errors.
tree: git://git.cmpxchg.org/linux-mmotm.git master
head: 82b56f797fa200a5e9feac3a93cb6496909b9670
commit: f192fb3c695b607044d4476c822783a8ae10ce75 [298/396] sysctl-remove-now-unused-typedef-ctl_table-fix
config: make ARCH=arm prima2_defconfig
All error/warnings:
kernel/built-in.o: In function `kexec_calculate_store_digests':
>> kernel/kexec.c:2181: undefined reference to `crypto_alloc_shash'
>> kernel/kexec.c:2223: undefined reference to `crypto_shash_update'
>> kernel/kexec.c:2238: undefined reference to `crypto_shash_update'
>> kernel/kexec.c:2253: undefined reference to `crypto_shash_final'
vim +2181 kernel/kexec.c
025d7537 Vivek Goyal 2014-07-02 2175 struct kexec_sha_region *sha_regions;
025d7537 Vivek Goyal 2014-07-02 2176 struct purgatory_info *pi = &image->purgatory_info;
025d7537 Vivek Goyal 2014-07-02 2177
025d7537 Vivek Goyal 2014-07-02 2178 zero_buf = __va(page_to_pfn(ZERO_PAGE(0)) << PAGE_SHIFT);
025d7537 Vivek Goyal 2014-07-02 2179 zero_buf_sz = PAGE_SIZE;
025d7537 Vivek Goyal 2014-07-02 2180
025d7537 Vivek Goyal 2014-07-02 @2181 tfm = crypto_alloc_shash("sha256", 0, 0);
025d7537 Vivek Goyal 2014-07-02 2182 if (IS_ERR(tfm)) {
025d7537 Vivek Goyal 2014-07-02 2183 ret = PTR_ERR(tfm);
025d7537 Vivek Goyal 2014-07-02 2184 goto out;
025d7537 Vivek Goyal 2014-07-02 2185 }
025d7537 Vivek Goyal 2014-07-02 2186
025d7537 Vivek Goyal 2014-07-02 2187 desc_size = crypto_shash_descsize(tfm) + sizeof(*desc);
025d7537 Vivek Goyal 2014-07-02 2188 desc = kzalloc(desc_size, GFP_KERNEL);
025d7537 Vivek Goyal 2014-07-02 2189 if (!desc) {
025d7537 Vivek Goyal 2014-07-02 2190 ret = -ENOMEM;
025d7537 Vivek Goyal 2014-07-02 2191 goto out_free_tfm;
025d7537 Vivek Goyal 2014-07-02 2192 }
025d7537 Vivek Goyal 2014-07-02 2193
025d7537 Vivek Goyal 2014-07-02 2194 sha_region_sz = KEXEC_SEGMENT_MAX * sizeof(struct kexec_sha_region);
025d7537 Vivek Goyal 2014-07-02 2195 sha_regions = vzalloc(sha_region_sz);
025d7537 Vivek Goyal 2014-07-02 2196 if (!sha_regions)
025d7537 Vivek Goyal 2014-07-02 2197 goto out_free_desc;
025d7537 Vivek Goyal 2014-07-02 2198
025d7537 Vivek Goyal 2014-07-02 2199 desc->tfm = tfm;
025d7537 Vivek Goyal 2014-07-02 2200 desc->flags = 0;
025d7537 Vivek Goyal 2014-07-02 2201
025d7537 Vivek Goyal 2014-07-02 2202 ret = crypto_shash_init(desc);
025d7537 Vivek Goyal 2014-07-02 2203 if (ret < 0)
025d7537 Vivek Goyal 2014-07-02 2204 goto out_free_sha_regions;
025d7537 Vivek Goyal 2014-07-02 2205
025d7537 Vivek Goyal 2014-07-02 2206 digest = kzalloc(SHA256_DIGEST_SIZE, GFP_KERNEL);
025d7537 Vivek Goyal 2014-07-02 2207 if (!digest) {
025d7537 Vivek Goyal 2014-07-02 2208 ret = -ENOMEM;
025d7537 Vivek Goyal 2014-07-02 2209 goto out_free_sha_regions;
025d7537 Vivek Goyal 2014-07-02 2210 }
025d7537 Vivek Goyal 2014-07-02 2211
025d7537 Vivek Goyal 2014-07-02 2212 for (j = i = 0; i < image->nr_segments; i++) {
025d7537 Vivek Goyal 2014-07-02 2213 struct kexec_segment *ksegment;
025d7537 Vivek Goyal 2014-07-02 2214
025d7537 Vivek Goyal 2014-07-02 2215 ksegment = &image->segment[i];
025d7537 Vivek Goyal 2014-07-02 2216 /*
025d7537 Vivek Goyal 2014-07-02 2217 * Skip purgatory as it will be modified once we put digest
025d7537 Vivek Goyal 2014-07-02 2218 * info in purgatory.
025d7537 Vivek Goyal 2014-07-02 2219 */
025d7537 Vivek Goyal 2014-07-02 2220 if (ksegment->kbuf == pi->purgatory_buf)
025d7537 Vivek Goyal 2014-07-02 2221 continue;
025d7537 Vivek Goyal 2014-07-02 2222
025d7537 Vivek Goyal 2014-07-02 @2223 ret = crypto_shash_update(desc, ksegment->kbuf,
025d7537 Vivek Goyal 2014-07-02 2224 ksegment->bufsz);
025d7537 Vivek Goyal 2014-07-02 2225 if (ret)
025d7537 Vivek Goyal 2014-07-02 2226 break;
025d7537 Vivek Goyal 2014-07-02 2227
025d7537 Vivek Goyal 2014-07-02 2228 /*
025d7537 Vivek Goyal 2014-07-02 2229 * Assume rest of the buffer is filled with zero and
025d7537 Vivek Goyal 2014-07-02 2230 * update digest accordingly.
025d7537 Vivek Goyal 2014-07-02 2231 */
025d7537 Vivek Goyal 2014-07-02 2232 nullsz = ksegment->memsz - ksegment->bufsz;
025d7537 Vivek Goyal 2014-07-02 2233 while (nullsz) {
025d7537 Vivek Goyal 2014-07-02 2234 unsigned long bytes = nullsz;
025d7537 Vivek Goyal 2014-07-02 2235
025d7537 Vivek Goyal 2014-07-02 2236 if (bytes > zero_buf_sz)
025d7537 Vivek Goyal 2014-07-02 2237 bytes = zero_buf_sz;
025d7537 Vivek Goyal 2014-07-02 @2238 ret = crypto_shash_update(desc, zero_buf, bytes);
025d7537 Vivek Goyal 2014-07-02 2239 if (ret)
025d7537 Vivek Goyal 2014-07-02 2240 break;
025d7537 Vivek Goyal 2014-07-02 2241 nullsz -= bytes;
025d7537 Vivek Goyal 2014-07-02 2242 }
025d7537 Vivek Goyal 2014-07-02 2243
025d7537 Vivek Goyal 2014-07-02 2244 if (ret)
025d7537 Vivek Goyal 2014-07-02 2245 break;
025d7537 Vivek Goyal 2014-07-02 2246
025d7537 Vivek Goyal 2014-07-02 2247 sha_regions[j].start = ksegment->mem;
025d7537 Vivek Goyal 2014-07-02 2248 sha_regions[j].len = ksegment->memsz;
025d7537 Vivek Goyal 2014-07-02 2249 j++;
025d7537 Vivek Goyal 2014-07-02 2250 }
025d7537 Vivek Goyal 2014-07-02 2251
025d7537 Vivek Goyal 2014-07-02 2252 if (!ret) {
025d7537 Vivek Goyal 2014-07-02 @2253 ret = crypto_shash_final(desc, digest);
025d7537 Vivek Goyal 2014-07-02 2254 if (ret)
025d7537 Vivek Goyal 2014-07-02 2255 goto out_free_digest;
025d7537 Vivek Goyal 2014-07-02 2256 ret = kexec_purgatory_get_set_symbol(image, "sha_regions",
:::::: The code at line 2181 was first introduced by commit
:::::: 025d75374c9c08274f60da5802381a8ef7490388 kexec: load and relocate purgatory at kernel load time
:::::: TO: Vivek Goyal <vgoyal@xxxxxxxxxx>
:::::: CC: Johannes Weiner <hannes@xxxxxxxxxxx>
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