From: kernel test robot <lkp@intel.com>
To: oe-kbuild@lists.linux.dev
Cc: lkp@intel.com, Dan Carpenter <error27@gmail.com>
Subject: [tip:timers/vdso 11/12] arch/powerpc/mm/pgtable-frag.c:25 pte_frag_destroy() warn: mask and shift to zero: expr='(pte_frag & ~(~(((1) << 12) - 1))) >> 12'
Date: Fri, 18 Oct 2024 22:47:41 +0800 [thread overview]
Message-ID: <202410182245.Vi475RuM-lkp@intel.com> (raw)
BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
CC: linux-kernel@vger.kernel.org
CC: x86@kernel.org
TO: Vincenzo Frascino <vincenzo.frascino@arm.com>
CC: Thomas Gleixner <tglx@linutronix.de>
CC: Arnd Bergmann <arnd@arndb.de>
tree: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git timers/vdso
head: 6febe0efb2df49105b839d6a3a45ab63d40f315a
commit: efe8419ae78d65e83edc31aad74b605c12e7d60c [11/12] vdso: Introduce vdso/page.h
:::::: branch date: 3 days ago
:::::: commit date: 3 days ago
config: powerpc-randconfig-r072-20241018 (https://download.01.org/0day-ci/archive/20241018/202410182245.Vi475RuM-lkp@intel.com/config)
compiler: powerpc-linux-gcc (GCC) 14.1.0
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/202410182245.Vi475RuM-lkp@intel.com/
smatch warnings:
arch/powerpc/mm/pgtable-frag.c:25 pte_frag_destroy() warn: mask and shift to zero: expr='(pte_frag & ~(~(((1) << 12) - 1))) >> 12'
vim +25 arch/powerpc/mm/pgtable-frag.c
a95d133c8643ca Christophe Leroy 2018-11-29 17
a95d133c8643ca Christophe Leroy 2018-11-29 18 void pte_frag_destroy(void *pte_frag)
a95d133c8643ca Christophe Leroy 2018-11-29 19 {
a95d133c8643ca Christophe Leroy 2018-11-29 20 int count;
4eaca96140b33e Vishal Moola (Oracle 2023-08-07 21) struct ptdesc *ptdesc;
a95d133c8643ca Christophe Leroy 2018-11-29 22
4eaca96140b33e Vishal Moola (Oracle 2023-08-07 23) ptdesc = virt_to_ptdesc(pte_frag);
a95d133c8643ca Christophe Leroy 2018-11-29 24 /* drop all the pending references */
a95d133c8643ca Christophe Leroy 2018-11-29 @25 count = ((unsigned long)pte_frag & ~PAGE_MASK) >> PTE_FRAG_SIZE_SHIFT;
a95d133c8643ca Christophe Leroy 2018-11-29 26 /* We allow PTE_FRAG_NR fragments from a PTE page */
4eaca96140b33e Vishal Moola (Oracle 2023-08-07 27) if (atomic_sub_and_test(PTE_FRAG_NR - count, &ptdesc->pt_frag_refcount)) {
4eaca96140b33e Vishal Moola (Oracle 2023-08-07 28) pagetable_pte_dtor(ptdesc);
4eaca96140b33e Vishal Moola (Oracle 2023-08-07 29) pagetable_free(ptdesc);
a95d133c8643ca Christophe Leroy 2018-11-29 30 }
a95d133c8643ca Christophe Leroy 2018-11-29 31 }
a95d133c8643ca Christophe Leroy 2018-11-29 32
:::::: The code at line 25 was first introduced by commit
:::::: a95d133c8643cae40a35f82184640d312ba9f11f powerpc/mm: Move pte_fragment_alloc() to a common location
:::::: TO: Christophe Leroy <christophe.leroy@c-s.fr>
:::::: CC: Michael Ellerman <mpe@ellerman.id.au>
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
next reply other threads:[~2024-10-18 14:48 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-10-18 14:47 kernel test robot [this message]
-- strict thread matches above, loose matches on Subject: below --
2024-10-18 6:39 [tip:timers/vdso 11/12] arch/powerpc/mm/pgtable-frag.c:25 pte_frag_destroy() warn: mask and shift to zero: expr='(pte_frag & ~(~(((1) << 12) - 1))) >> 12' kernel test robot
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