[gustavoars:testing/wfamnae-next20260309 14/19] mm/mmu_gather.c:25:39: warning: comparison of distinct pointer types ('struct mmu_gather_batch *' and 'struct mmu_gather_batch_hdr *')
From: kernel test robot
Date: Tue Mar 10 2026 - 22:46:59 EST
tree: https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git testing/wfamnae-next20260309
head: e9c10f65a9dba55b2ab308e88aeb068d775d1a65
commit: f51f62a26a08681ba34f2d3e8df8395c91ecd8c1 [14/19] mm/mmu_gather: avoid dozens of -Wflex-array-member-not-at-end warnings
config: x86_64-allnoconfig (https://download.01.org/0day-ci/archive/20260311/202603111025.WgKunZHd-lkp@xxxxxxxxx/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260311/202603111025.WgKunZHd-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202603111025.WgKunZHd-lkp@xxxxxxxxx/
All warnings (new ones prefixed by >>):
>> mm/mmu_gather.c:25:39: warning: comparison of distinct pointer types ('struct mmu_gather_batch *' and 'struct mmu_gather_batch_hdr *') [-Wcompare-distinct-pointer-types]
25 | if (tlb->delayed_rmap && tlb->active != &tlb->local)
| ~~~~~~~~~~~ ^ ~~~~~~~~~~~
1 warning generated.
vim +25 mm/mmu_gather.c
952a31c9e6fa963 Martin Schwidefsky 2018-09-18 19
196d9d8bb71deaa Peter Zijlstra 2018-09-03 20 static bool tlb_next_batch(struct mmu_gather *tlb)
196d9d8bb71deaa Peter Zijlstra 2018-09-03 21 {
196d9d8bb71deaa Peter Zijlstra 2018-09-03 22 struct mmu_gather_batch *batch;
196d9d8bb71deaa Peter Zijlstra 2018-09-03 23
c47454823bd4e3a Linus Torvalds 2022-12-06 24 /* Limit batching if we have delayed rmaps pending */
c47454823bd4e3a Linus Torvalds 2022-12-06 @25 if (tlb->delayed_rmap && tlb->active != &tlb->local)
5df397dec7c4c08 Linus Torvalds 2022-11-09 26 return false;
5df397dec7c4c08 Linus Torvalds 2022-11-09 27
196d9d8bb71deaa Peter Zijlstra 2018-09-03 28 batch = tlb->active;
196d9d8bb71deaa Peter Zijlstra 2018-09-03 29 if (batch->next) {
196d9d8bb71deaa Peter Zijlstra 2018-09-03 30 tlb->active = batch->next;
196d9d8bb71deaa Peter Zijlstra 2018-09-03 31 return true;
196d9d8bb71deaa Peter Zijlstra 2018-09-03 32 }
196d9d8bb71deaa Peter Zijlstra 2018-09-03 33
196d9d8bb71deaa Peter Zijlstra 2018-09-03 34 if (tlb->batch_count == MAX_GATHER_BATCH_COUNT)
196d9d8bb71deaa Peter Zijlstra 2018-09-03 35 return false;
196d9d8bb71deaa Peter Zijlstra 2018-09-03 36
adf085ff0d6fde5 Qianfeng Rong 2025-08-12 37 batch = (void *)__get_free_page(GFP_NOWAIT);
196d9d8bb71deaa Peter Zijlstra 2018-09-03 38 if (!batch)
196d9d8bb71deaa Peter Zijlstra 2018-09-03 39 return false;
196d9d8bb71deaa Peter Zijlstra 2018-09-03 40
196d9d8bb71deaa Peter Zijlstra 2018-09-03 41 tlb->batch_count++;
196d9d8bb71deaa Peter Zijlstra 2018-09-03 42 batch->next = NULL;
196d9d8bb71deaa Peter Zijlstra 2018-09-03 43 batch->nr = 0;
196d9d8bb71deaa Peter Zijlstra 2018-09-03 44 batch->max = MAX_GATHER_BATCH;
196d9d8bb71deaa Peter Zijlstra 2018-09-03 45
196d9d8bb71deaa Peter Zijlstra 2018-09-03 46 tlb->active->next = batch;
196d9d8bb71deaa Peter Zijlstra 2018-09-03 47 tlb->active = batch;
196d9d8bb71deaa Peter Zijlstra 2018-09-03 48
196d9d8bb71deaa Peter Zijlstra 2018-09-03 49 return true;
196d9d8bb71deaa Peter Zijlstra 2018-09-03 50 }
196d9d8bb71deaa Peter Zijlstra 2018-09-03 51
:::::: The code at line 25 was first introduced by commit
:::::: c47454823bd4e3ab34ed3f795afd4479ab938a3f mm: mmu_gather: allow more than one batch of delayed rmaps
:::::: TO: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
:::::: CC: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
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