From: kernel test robot <lkp@intel.com>
To: oe-kbuild@lists.linux.dev
Cc: lkp@intel.com, Dan Carpenter <error27@gmail.com>
Subject: 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))...
Date: Sat, 25 Jul 2026 22:45:00 +0800 [thread overview]
Message-ID: <202607252245.0syGIDlt-lkp@intel.com> (raw)
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: 48a5a7ab8d6ab7090564339e039c421f315de912
commit: 104ea1c84b91c9f452e497ba51602b903711cdd5 bits: unify the non-asm GENMASK*()
date: 12 months ago
:::::: branch date: 2 days ago
:::::: commit date: 12 months ago
config: powerpc64-randconfig-r073-20260725 (https://download.01.org/0day-ci/archive/20260725/202607252245.0syGIDlt-lkp@intel.com/config)
compiler: clang version 21.1.8 (https://github.com/llvm/llvm-project 2078da43e25a4623cab2d0d60decddf709aaea28)
smatch: v0.5.0-9187-g5189e3fb
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
| Fixes: 104ea1c84b91 ("bits: unify the non-asm GENMASK*()")
| Reported-by: kernel test robot <lkp@intel.com>
| Reported-by: Dan Carpenter <error27@gmail.com>
| Closes: https://lore.kernel.org/r/202607252245.0syGIDlt-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>
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
next reply other threads:[~2026-07-25 14:45 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-25 14:45 kernel test robot [this message]
-- strict thread matches above, loose matches on Subject: below --
2025-12-30 11:33 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
2025-12-29 22:06 kernel test robot
2025-08-19 12:21 kernel test robot
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