From: kernel test robot <lkp@intel.com>
To: oe-kbuild@lists.linux.dev
Cc: lkp@intel.com, Dan Carpenter <error27@gmail.com>
Subject: [linux-next:master 8590/9733] lib/raid/raid6/arm/recov_neon_inner.c:51 (null)() warn: statement has no effect 'uint8x16_t'
Date: Tue, 02 Jun 2026 17:49:13 +0800 [thread overview]
Message-ID: <202606021711.560Eh9WX-lkp@intel.com> (raw)
BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
TO: Christoph Hellwig <hch@lst.de>
CC: Andrew Morton <akpm@linux-foundation.org>
CC: Linux Memory Management List <linux-mm@kvack.org>
tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head: 7da7f07112610a520567421dd2ffcb51beaefbcc
commit: 3626738bc7147d52cb49f3994a9846aa2d34810a [8590/9733] raid6: move to lib/raid/
:::::: branch date: 3 days ago
:::::: commit date: 4 days ago
config: arm64-randconfig-r073-20260602 (https://download.01.org/0day-ci/archive/20260602/202606021711.560Eh9WX-lkp@intel.com/config)
compiler: clang version 16.0.6 (https://github.com/llvm/llvm-project 7cbf1a2591520c2491aa35339f227775f4d3adf6)
smatch: v0.5.0-9185-gbcc58b9c
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@intel.com>
| Reported-by: Dan Carpenter <error27@gmail.com>
| Closes: https://lore.kernel.org/r/202606021711.560Eh9WX-lkp@intel.com/
New smatch warnings:
lib/raid/raid6/arm/recov_neon_inner.c:51 (null)() warn: statement has no effect 'uint8x16_t'
Old smatch warnings:
lib/raid/raid6/arm/recov_neon_inner.c:93 (null)() warn: statement has no effect 'uint8x16_t'
vim +/uint8x16_t +51 lib/raid/raid6/arm/recov_neon_inner.c
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 27
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 28 void __raid6_2data_recov_neon(int bytes, uint8_t *p, uint8_t *q, uint8_t *dp,
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 29 uint8_t *dq, const uint8_t *pbmul,
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 30 const uint8_t *qmul)
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 31 {
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 32 uint8x16_t pm0 = vld1q_u8(pbmul);
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 33 uint8x16_t pm1 = vld1q_u8(pbmul + 16);
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 34 uint8x16_t qm0 = vld1q_u8(qmul);
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 35 uint8x16_t qm1 = vld1q_u8(qmul + 16);
1ad3935b39da78 lib/raid6/recov_neon_inner.c Nick Desaulniers 2019-02-25 36 uint8x16_t x0f = vdupq_n_u8(0x0f);
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 37
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 38 /*
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 39 * while ( bytes-- ) {
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 40 * uint8_t px, qx, db;
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 41 *
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 42 * px = *p ^ *dp;
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 43 * qx = qmul[*q ^ *dq];
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 44 * *dq++ = db = pbmul[px] ^ qx;
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 45 * *dp++ = db ^ px;
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 46 * p++; q++;
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 47 * }
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 48 */
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 49
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 50 while (bytes) {
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 @51 uint8x16_t vx, vy, px, qx, db;
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 52
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 53 px = veorq_u8(vld1q_u8(p), vld1q_u8(dp));
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 54 vx = veorq_u8(vld1q_u8(q), vld1q_u8(dq));
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 55
335ebe3035b6fc lib/raid6/recov_neon_inner.c Ard Biesheuvel 2019-02-26 56 vy = vshrq_n_u8(vx, 4);
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 57 vx = vqtbl1q_u8(qm0, vandq_u8(vx, x0f));
335ebe3035b6fc lib/raid6/recov_neon_inner.c Ard Biesheuvel 2019-02-26 58 vy = vqtbl1q_u8(qm1, vy);
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 59 qx = veorq_u8(vx, vy);
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 60
335ebe3035b6fc lib/raid6/recov_neon_inner.c Ard Biesheuvel 2019-02-26 61 vy = vshrq_n_u8(px, 4);
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 62 vx = vqtbl1q_u8(pm0, vandq_u8(px, x0f));
335ebe3035b6fc lib/raid6/recov_neon_inner.c Ard Biesheuvel 2019-02-26 63 vy = vqtbl1q_u8(pm1, vy);
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 64 vx = veorq_u8(vx, vy);
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 65 db = veorq_u8(vx, qx);
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 66
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 67 vst1q_u8(dq, db);
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 68 vst1q_u8(dp, veorq_u8(db, px));
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 69
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 70 bytes -= 16;
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 71 p += 16;
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 72 q += 16;
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 73 dp += 16;
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 74 dq += 16;
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 75 }
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 76 }
6ec4e2514decd6 lib/raid6/recov_neon_inner.c Ard Biesheuvel 2017-07-13 77
:::::: The code at line 51 was first introduced by commit
:::::: 6ec4e2514decd6fb4782a9364fa71d6244d05af4 md/raid6: implement recovery using ARM NEON intrinsics
:::::: TO: Ard Biesheuvel <ard.biesheuvel@linaro.org>
:::::: CC: Catalin Marinas <catalin.marinas@arm.com>
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
reply other threads:[~2026-06-02 9:50 UTC|newest]
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