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))...

BCC: [email protected]
CC: [email protected]
CC: [email protected]
TO: Vincent Mailhol <[email protected]>
CC: Yury Norov <[email protected]>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git =
master
head:   48a5a7ab8d6ab7090564339e039c421f315de912
commit: 104ea1c84b91c9f452e497ba51602b903711cdd5 bits: unify the non-asm GE=
NMASK*()
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/[email protected]/config)
compiler: clang version 21.1.8 (https://github.com/llvm/llvm-project 2078da=
43e25a4623cab2d0d60decddf709aaea28)
smatch: v0.5.0-9187-g5189e3fb

If you fix the issue in a separate patch/commit (i.e. not just a new versio=
n of
the same patch/commit), kindly add following tags
| Fixes: 104ea1c84b91 ("bits: unify the non-asm GENMASK*()")
| Reported-by: kernel test robot <[email protected]>
| Reported-by: Dan Carpenter <[email protected]>
| Closes: https://lore.kernel.org/r/[email protected]/

New smatch warnings:
net/core/netmem_priv.h:25 netmem_is_pp() warn: masked condition '(netmem_ge=
t_pp_magic(netmem) & ~((((0) + (((((1 << (8 * 8 - 1 - (((-1)) < 1))) - 1) +=
 (1 << (8 * 8 - 1 - (((-1)) < 1))))) << ((1 + __fls((64 + (6767463209352822=
784)) - (6767463209352822784)))) & ((((1 << (8 * 8 - 1 - (((-1)) < 1))) - 1=
) + (1 << (8 * 8 - 1 - (((-1)) < 1))))) >> ((8 * 8) - 1 - ((((32) < (__ffs(=
(6767463209352822784)) - (1 + __fls((64 + (6767463209352822784)) - (6767463=
209352822784))))) ?(32):(__ffs((6767463209352822784)) - (1 + __fls((64 + (6=
767463209352822784)) - (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 =20
cd3c93167da0e76 Toke H=C3=B8iland-J=C3=B8rgensen 2025-04-09  23  static inl=
ine bool netmem_is_pp(netmem_ref netmem)
cd3c93167da0e76 Toke H=C3=B8iland-J=C3=B8rgensen 2025-04-09  24  {
cd3c93167da0e76 Toke H=C3=B8iland-J=C3=B8rgensen 2025-04-09 @25  	return (n=
etmem_get_pp_magic(netmem) & PP_MAGIC_MASK) =3D=3D PP_SIGNATURE;
cd3c93167da0e76 Toke H=C3=B8iland-J=C3=B8rgensen 2025-04-09  26  }
cd3c93167da0e76 Toke H=C3=B8iland-J=C3=B8rgensen 2025-04-09  27 =20

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

:::::: TO: Toke H=C3=B8iland-J=C3=B8rgensen <[email protected]>
:::::: CC: Jakub Kicinski <[email protected]>

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