* [meghadey-crypto:crypto-avx512 5/6] arch/x86/crypto/aesni-intel_glue.c:683:27: warning: Value stored to 'data' during its initialization is never read [clang-analyzer-deadcode.DeadStores]
[not found] <202110012233.slVpKlUF-lkp@intel.com>
@ 2021-10-10 10:13 ` kernel test robot
0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2021-10-10 10:13 UTC (permalink / raw)
To: Megha Dey; +Cc: llvm, kbuild-all, Linux Kernel Mailing List, Tomasz Kantecki
[-- Attachment #1: Type: text/plain, Size: 13200 bytes --]
tree: https://github.com/meghadey/crypto crypto-avx512
head: 9c8c2ca77f6e2575a130bddb9767d068e1162d71
commit: 377aede9f10ee28be954473668bc6d33c6c9db75 [5/6] crypto: aesni - AVX512 version of AESNI-GCM using VPCLMULQDQ
config: x86_64-randconfig-c007-20210930 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 962e503cc8bc411f7523cc393acae8aae425b1c4)
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/meghadey/crypto/commit/377aede9f10ee28be954473668bc6d33c6c9db75
git remote add meghadey-crypto https://github.com/meghadey/crypto
git fetch --no-tags meghadey-crypto crypto-avx512
git checkout 377aede9f10ee28be954473668bc6d33c6c9db75
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 clang-analyzer
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
clang-analyzer warnings: (new ones prefixed by >>)
>> arch/x86/crypto/aesni-intel_glue.c:683:27: warning: Value stored to 'data' during its initialization is never read [clang-analyzer-deadcode.DeadStores]
struct gcm_context_data *data = PTR_ALIGN((void *)databuf, AESNI_ALIGN);
^~~~
vim +/data +683 arch/x86/crypto/aesni-intel_glue.c
cce2ea8d90fec7 Sabrina Dubroca 2017-04-28 676
e845520707f85c Dave Watson 2018-02-14 677 static int gcmaes_crypt_by_sg(bool enc, struct aead_request *req,
e845520707f85c Dave Watson 2018-02-14 678 unsigned int assoclen, u8 *hash_subkey,
83c83e658863e4 Ard Biesheuvel 2021-01-04 679 u8 *iv, void *aes_ctx, u8 *auth_tag,
83c83e658863e4 Ard Biesheuvel 2021-01-04 680 unsigned long auth_tag_len)
e845520707f85c Dave Watson 2018-02-14 681 {
a13ed1d15b07a0 Ard Biesheuvel 2021-01-04 682 u8 databuf[sizeof(struct gcm_context_data) + (AESNI_ALIGN - 8)] __aligned(8);
a13ed1d15b07a0 Ard Biesheuvel 2021-01-04 @683 struct gcm_context_data *data = PTR_ALIGN((void *)databuf, AESNI_ALIGN);
e845520707f85c Dave Watson 2018-02-14 684 unsigned long left = req->cryptlen;
e845520707f85c Dave Watson 2018-02-14 685 struct scatter_walk assoc_sg_walk;
83c83e658863e4 Ard Biesheuvel 2021-01-04 686 struct skcipher_walk walk;
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 687 bool do_avx, do_avx2;
e845520707f85c Dave Watson 2018-02-14 688 u8 *assocmem = NULL;
83c83e658863e4 Ard Biesheuvel 2021-01-04 689 u8 *assoc;
83c83e658863e4 Ard Biesheuvel 2021-01-04 690 int err;
377aede9f10ee2 Megha Dey 2021-01-20 691 int hash_key_size;
377aede9f10ee2 Megha Dey 2021-01-20 692
377aede9f10ee2 Megha Dey 2021-01-20 693 if (static_branch_likely(&gcm_use_avx512))
377aede9f10ee2 Megha Dey 2021-01-20 694 hash_key_size = 16 * GCM_AVX512_NUM_HASH_KEYS;
377aede9f10ee2 Megha Dey 2021-01-20 695 else
377aede9f10ee2 Megha Dey 2021-01-20 696 hash_key_size = 16 * GCM_BLOCK_LEN;
377aede9f10ee2 Megha Dey 2021-01-20 697
377aede9f10ee2 Megha Dey 2021-01-20 698 /* Allocate gcm_context_data structure on the heap. With the
377aede9f10ee2 Megha Dey 2021-01-20 699 * VPCLMULQDQ version of GCM needing 48 hashkeys, allocating
377aede9f10ee2 Megha Dey 2021-01-20 700 * this structure on the stack will inflate its size significantly.
377aede9f10ee2 Megha Dey 2021-01-20 701 */
377aede9f10ee2 Megha Dey 2021-01-20 702 data = kzalloc(sizeof(*data) + hash_key_size, GFP_KERNEL);
377aede9f10ee2 Megha Dey 2021-01-20 703 if (!data) {
377aede9f10ee2 Megha Dey 2021-01-20 704 kfree(data);
377aede9f10ee2 Megha Dey 2021-01-20 705 return -ENOMEM;
377aede9f10ee2 Megha Dey 2021-01-20 706 }
e845520707f85c Dave Watson 2018-02-14 707
e845520707f85c Dave Watson 2018-02-14 708 if (!enc)
e845520707f85c Dave Watson 2018-02-14 709 left -= auth_tag_len;
e845520707f85c Dave Watson 2018-02-14 710
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 711 do_avx = (left >= AVX_GEN2_OPTSIZE);
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 712 do_avx2 = (left >= AVX_GEN4_OPTSIZE);
603f8c3b0dbbe2 Dave Watson 2018-12-10 713
e845520707f85c Dave Watson 2018-02-14 714 /* Linearize assoc, if not already linear */
2694e23ffd210c Ard Biesheuvel 2021-01-04 715 if (req->src->length >= assoclen && req->src->length) {
e845520707f85c Dave Watson 2018-02-14 716 scatterwalk_start(&assoc_sg_walk, req->src);
e845520707f85c Dave Watson 2018-02-14 717 assoc = scatterwalk_map(&assoc_sg_walk);
e845520707f85c Dave Watson 2018-02-14 718 } else {
2694e23ffd210c Ard Biesheuvel 2021-01-04 719 gfp_t flags = (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
2694e23ffd210c Ard Biesheuvel 2021-01-04 720 GFP_KERNEL : GFP_ATOMIC;
2694e23ffd210c Ard Biesheuvel 2021-01-04 721
e845520707f85c Dave Watson 2018-02-14 722 /* assoc can be any length, so must be on heap */
2694e23ffd210c Ard Biesheuvel 2021-01-04 723 assocmem = kmalloc(assoclen, flags);
e845520707f85c Dave Watson 2018-02-14 724 if (unlikely(!assocmem))
e845520707f85c Dave Watson 2018-02-14 725 return -ENOMEM;
e845520707f85c Dave Watson 2018-02-14 726 assoc = assocmem;
e845520707f85c Dave Watson 2018-02-14 727
e845520707f85c Dave Watson 2018-02-14 728 scatterwalk_map_and_copy(assoc, req->src, 0, assoclen, 0);
e845520707f85c Dave Watson 2018-02-14 729 }
e845520707f85c Dave Watson 2018-02-14 730
e845520707f85c Dave Watson 2018-02-14 731 kernel_fpu_begin();
377aede9f10ee2 Megha Dey 2021-01-20 732
377aede9f10ee2 Megha Dey 2021-01-20 733 if (static_branch_likely(&gcm_use_avx512) &&
377aede9f10ee2 Megha Dey 2021-01-20 734 IS_ENABLED(CONFIG_CRYPTO_AES_GCM_AVX512))
377aede9f10ee2 Megha Dey 2021-01-20 735 aesni_gcm_init_avx_512(aes_ctx, data, iv, hash_subkey, assoc,
377aede9f10ee2 Megha Dey 2021-01-20 736 assoclen);
377aede9f10ee2 Megha Dey 2021-01-20 737 else if (static_branch_likely(&gcm_use_avx2) && do_avx2)
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 738 aesni_gcm_init_avx_gen4(aes_ctx, data, iv, hash_subkey, assoc,
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 739 assoclen);
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 740 else if (static_branch_likely(&gcm_use_avx) && do_avx)
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 741 aesni_gcm_init_avx_gen2(aes_ctx, data, iv, hash_subkey, assoc,
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 742 assoclen);
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 743 else
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 744 aesni_gcm_init(aes_ctx, data, iv, hash_subkey, assoc, assoclen);
e845520707f85c Dave Watson 2018-02-14 745 kernel_fpu_end();
e845520707f85c Dave Watson 2018-02-14 746
e845520707f85c Dave Watson 2018-02-14 747 if (!assocmem)
e845520707f85c Dave Watson 2018-02-14 748 scatterwalk_unmap(assoc);
e845520707f85c Dave Watson 2018-02-14 749 else
e845520707f85c Dave Watson 2018-02-14 750 kfree(assocmem);
e845520707f85c Dave Watson 2018-02-14 751
83c83e658863e4 Ard Biesheuvel 2021-01-04 752 err = enc ? skcipher_walk_aead_encrypt(&walk, req, false)
83c83e658863e4 Ard Biesheuvel 2021-01-04 753 : skcipher_walk_aead_decrypt(&walk, req, false);
e845520707f85c Dave Watson 2018-02-14 754
83c83e658863e4 Ard Biesheuvel 2021-01-04 755 while (walk.nbytes > 0) {
83c83e658863e4 Ard Biesheuvel 2021-01-04 756 kernel_fpu_begin();
377aede9f10ee2 Megha Dey 2021-01-20 757 if (static_branch_likely(&gcm_use_avx512)
377aede9f10ee2 Megha Dey 2021-01-20 758 && IS_ENABLED(CONFIG_CRYPTO_AES_GCM_AVX512)) {
377aede9f10ee2 Megha Dey 2021-01-20 759 if (enc)
377aede9f10ee2 Megha Dey 2021-01-20 760 aesni_gcm_enc_update_avx_512(aes_ctx, data,
377aede9f10ee2 Megha Dey 2021-01-20 761 walk.dst.virt.addr,
377aede9f10ee2 Megha Dey 2021-01-20 762 walk.src.virt.addr,
377aede9f10ee2 Megha Dey 2021-01-20 763 walk.nbytes);
377aede9f10ee2 Megha Dey 2021-01-20 764 else
377aede9f10ee2 Megha Dey 2021-01-20 765 aesni_gcm_dec_update_avx_512(aes_ctx, data,
377aede9f10ee2 Megha Dey 2021-01-20 766 walk.dst.virt.addr,
377aede9f10ee2 Megha Dey 2021-01-20 767 walk.src.virt.addr,
377aede9f10ee2 Megha Dey 2021-01-20 768 walk.nbytes);
377aede9f10ee2 Megha Dey 2021-01-20 769 } else if (static_branch_likely(&gcm_use_avx2) && do_avx2) {
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 770 if (enc)
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 771 aesni_gcm_enc_update_avx_gen4(aes_ctx, data,
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 772 walk.dst.virt.addr,
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 773 walk.src.virt.addr,
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 774 walk.nbytes);
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 775 else
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 776 aesni_gcm_dec_update_avx_gen4(aes_ctx, data,
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 777 walk.dst.virt.addr,
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 778 walk.src.virt.addr,
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 779 walk.nbytes);
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 780 } else if (static_branch_likely(&gcm_use_avx) && do_avx) {
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 781 if (enc)
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 782 aesni_gcm_enc_update_avx_gen2(aes_ctx, data,
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 783 walk.dst.virt.addr,
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 784 walk.src.virt.addr,
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 785 walk.nbytes);
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 786 else
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 787 aesni_gcm_dec_update_avx_gen2(aes_ctx, data,
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 788 walk.dst.virt.addr,
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 789 walk.src.virt.addr,
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 790 walk.nbytes);
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 791 } else if (enc) {
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 792 aesni_gcm_enc_update(aes_ctx, data, walk.dst.virt.addr,
83c83e658863e4 Ard Biesheuvel 2021-01-04 793 walk.src.virt.addr, walk.nbytes);
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 794 } else {
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 795 aesni_gcm_dec_update(aes_ctx, data, walk.dst.virt.addr,
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 796 walk.src.virt.addr, walk.nbytes);
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 797 }
83c83e658863e4 Ard Biesheuvel 2021-01-04 798 kernel_fpu_end();
e845520707f85c Dave Watson 2018-02-14 799
83c83e658863e4 Ard Biesheuvel 2021-01-04 800 err = skcipher_walk_done(&walk, 0);
e845520707f85c Dave Watson 2018-02-14 801 }
e845520707f85c Dave Watson 2018-02-14 802
83c83e658863e4 Ard Biesheuvel 2021-01-04 803 if (err)
83c83e658863e4 Ard Biesheuvel 2021-01-04 804 return err;
83c83e658863e4 Ard Biesheuvel 2021-01-04 805
83c83e658863e4 Ard Biesheuvel 2021-01-04 806 kernel_fpu_begin();
377aede9f10ee2 Megha Dey 2021-01-20 807 if (static_branch_likely(&gcm_use_avx512) &&
377aede9f10ee2 Megha Dey 2021-01-20 808 IS_ENABLED(CONFIG_CRYPTO_AES_GCM_AVX512))
377aede9f10ee2 Megha Dey 2021-01-20 809 aesni_gcm_finalize_avx_512(aes_ctx, data, auth_tag,
377aede9f10ee2 Megha Dey 2021-01-20 810 auth_tag_len);
377aede9f10ee2 Megha Dey 2021-01-20 811 else if (static_branch_likely(&gcm_use_avx2) && do_avx2)
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 812 aesni_gcm_finalize_avx_gen4(aes_ctx, data, auth_tag,
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 813 auth_tag_len);
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 814 else if (static_branch_likely(&gcm_use_avx) && do_avx)
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 815 aesni_gcm_finalize_avx_gen2(aes_ctx, data, auth_tag,
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 816 auth_tag_len);
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 817 else
d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 818 aesni_gcm_finalize(aes_ctx, data, auth_tag, auth_tag_len);
83c83e658863e4 Ard Biesheuvel 2021-01-04 819 kernel_fpu_end();
e845520707f85c Dave Watson 2018-02-14 820
377aede9f10ee2 Megha Dey 2021-01-20 821 kfree(data);
e845520707f85c Dave Watson 2018-02-14 822 return 0;
e845520707f85c Dave Watson 2018-02-14 823 }
e845520707f85c Dave Watson 2018-02-14 824
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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