net/core/netmem_priv.h:25 netmem_is_pp() warn: masked condition '(netmem_get_pp_magic(netmem) & ~((((0) + (((((1 << (8 * 8 - 1 - (((-1)) < 1))) - 1) + (1 << (8 * 8 - 1 - (((-1)) < 1))))) << ((1 + __fls((64 + (6767463209352822784)) - (6767463209352822784))...

[kernel test robot <lkp@intel.com>]

BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
CC: linux-kernel@vger.kernel.org
TO: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
CC: Yury Norov <yury.norov@gmail.com>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   be48bcf004f9d0c9207ff21d0edb3b42f253829e
commit: 104ea1c84b91c9f452e497ba51602b903711cdd5 bits: unify the non-asm GENMASK*()
date:   3 weeks ago
:::::: branch date: 20 hours ago
:::::: commit date: 3 weeks ago
config: powerpc64-randconfig-r073-20250819 (https://download.01.org/0day-ci/archive/20250819/202508192052.0M4kvBQm-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 93d24b6b7b148c47a2fa228a4ef31524fa1d9f3f)

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/202508192052.0M4kvBQm-lkp@intel.com/

New smatch warnings:
net/core/netmem_priv.h:25 netmem_is_pp() warn: masked condition '(netmem_get_pp_magic(netmem) & ~((((0) + (((((1 << (8 * 8 - 1 - (((-1)) < 1))) - 1) + (1 << (8 * 8 - 1 - (((-1)) < 1))))) << ((1 + __fls((64 + (6767463209352822784)) - (6767463209352822784)))) & ((((1 << (8 * 8 - 1 - (((-1)) < 1))) - 1) + (1 << (8 * 8 - 1 - (((-1)) < 1))))) >> ((8 * 8) - 1 - ((((32) < (__ffs((6767463209352822784)) - (1 + __fls((64 + (6767463209352822784)) - (6767463209352822784))))) ?(32):(__ffs((6767463209352822784)) - (1 + __fls((64 + (6767463209352822784)) - (6767463209352822784))))) + ' is always false.

Old smatch warnings:
net/core/skbuff.c:4812 skb_segment() error: we previously assumed 'list_skb' could be null (see line 4747)

vim +25 net/core/netmem_priv.h

8ab79ed50cf10f3 Mina Almasry           2024-09-10  22  
cd3c93167da0e76 Toke Høiland-Jørgensen 2025-04-09  23  static inline bool netmem_is_pp(netmem_ref netmem)
cd3c93167da0e76 Toke Høiland-Jørgensen 2025-04-09  24  {
cd3c93167da0e76 Toke Høiland-Jørgensen 2025-04-09 @25  	return (netmem_get_pp_magic(netmem) & PP_MAGIC_MASK) == PP_SIGNATURE;
cd3c93167da0e76 Toke Høiland-Jørgensen 2025-04-09  26  }
cd3c93167da0e76 Toke Høiland-Jørgensen 2025-04-09  27  

:::::: The code at line 25 was first introduced by commit
:::::: cd3c93167da0e760b5819246eae7a4ea30fd014b page_pool: Move pp_magic check into helper functions

:::::: TO: Toke Høiland-Jørgensen <toke@redhat.com>
:::::: CC: Jakub Kicinski <kuba@kernel.org>

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