linux-kernel - mm/kfence/core.c:329:34: sparse: sparse: cast to restricted _

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Message-ID: <202311022155.9hNK2VJO-lkp@intel.com>
Date:   Thu, 2 Nov 2023 21:54:30 +0800
From:   kernel test robot <lkp@...el.com>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Alexander Potapenko <glider@...gle.com>,
        Marco Elver <elver@...gle.com>
Subject: mm/kfence/core.c:329:34: sparse: sparse: cast to restricted __le64

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   21e80f3841c01aeaf32d7aee7bbc87b3db1aa0c6
commit: 7581495ac82d6cb073609284c7f7186a48021d1e mm: kfence: fix false positives on big endian
date:   6 months ago
config: s390-randconfig-r113-20231102 (https://download.01.org/0day-ci/archive/20231102/202311022155.9hNK2VJO-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 13.2.0
reproduce: (https://download.01.org/0day-ci/archive/20231102/202311022155.9hNK2VJO-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/202311022155.9hNK2VJO-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> mm/kfence/core.c:329:34: sparse: sparse: cast to restricted __le64
   mm/kfence/core.c:333:34: sparse: sparse: cast to restricted __le64
   mm/kfence/core.c:352:21: sparse: sparse: cast to restricted __le64
   mm/kfence/core.c:372:21: sparse: sparse: cast to restricted __le64
   mm/kfence/core.c:1181:9: sparse: sparse: context imbalance in 'kfence_handle_page_fault' - different lock contexts for basic block

vim +329 mm/kfence/core.c

0ce20dd840897b Alexander Potapenko 2021-02-25  318  
1ba3cbf3ec3b21 Peng Zhang          2023-04-03  319  static inline void set_canary(const struct kfence_metadata *meta)
0ce20dd840897b Alexander Potapenko 2021-02-25  320  {
0ce20dd840897b Alexander Potapenko 2021-02-25  321  	const unsigned long pageaddr = ALIGN_DOWN(meta->addr, PAGE_SIZE);
1ba3cbf3ec3b21 Peng Zhang          2023-04-03  322  	unsigned long addr = pageaddr;
1ba3cbf3ec3b21 Peng Zhang          2023-04-03  323  
1ba3cbf3ec3b21 Peng Zhang          2023-04-03  324  	/*
1ba3cbf3ec3b21 Peng Zhang          2023-04-03  325  	 * The canary may be written to part of the object memory, but it does
1ba3cbf3ec3b21 Peng Zhang          2023-04-03  326  	 * not affect it. The user should initialize the object before using it.
1ba3cbf3ec3b21 Peng Zhang          2023-04-03  327  	 */
1ba3cbf3ec3b21 Peng Zhang          2023-04-03  328  	for (; addr < meta->addr; addr += sizeof(u64))
1ba3cbf3ec3b21 Peng Zhang          2023-04-03 @329  		*((u64 *)addr) = KFENCE_CANARY_PATTERN_U64;
1ba3cbf3ec3b21 Peng Zhang          2023-04-03  330  
1ba3cbf3ec3b21 Peng Zhang          2023-04-03  331  	addr = ALIGN_DOWN(meta->addr + meta->size, sizeof(u64));
1ba3cbf3ec3b21 Peng Zhang          2023-04-03  332  	for (; addr - pageaddr < PAGE_SIZE; addr += sizeof(u64))
1ba3cbf3ec3b21 Peng Zhang          2023-04-03  333  		*((u64 *)addr) = KFENCE_CANARY_PATTERN_U64;
1ba3cbf3ec3b21 Peng Zhang          2023-04-03  334  }
1ba3cbf3ec3b21 Peng Zhang          2023-04-03  335  

:::::: The code at line 329 was first introduced by commit
:::::: 1ba3cbf3ec3b21d866436fb46b4bb7bdc38608f9 mm: kfence: improve the performance of __kfence_alloc() and __kfence_free()

:::::: TO: Peng Zhang <zhangpeng.00@...edance.com>
:::::: CC: Andrew Morton <akpm@...ux-foundation.org>

-- 
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https://github.com/intel/lkp-tests/wiki