From: kbuild test robot <lkp@intel.com>
To: Jesse Brandeburg <jesse.brandeburg@intel.com>
Cc: kbuild-all@lists.01.org, linux-kernel@vger.kernel.org,
Borislav Petkov <bp@suse.de>,
Andy Shevchenko <andriy.shevchenko@intel.com>
Subject: arch/x86/kernel/apm_32.c:428:43: sparse: sparse: cast truncates bits from constant value (c0000400 becomes 400)
Date: Sun, 10 May 2020 22:03:54 +0800 [thread overview]
Message-ID: <202005102246.mLhqhR0Y%lkp@intel.com> (raw)
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: e99332e7b4cda6e60f5b5916cf9943a79dbef902
commit: 1651e700664b4597ddf4f8adfe435252a0d11277 x86: Fix bitops.h warning with a moved cast
date: 8 weeks ago
reproduce:
# apt-get install sparse
# sparse version: v0.6.1-191-gc51a0382-dirty
git checkout 1651e700664b4597ddf4f8adfe435252a0d11277
make ARCH=x86_64 allmodconfig
make C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'
If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp@intel.com>
sparse warnings: (new ones prefixed by >>)
>> arch/x86/kernel/apm_32.c:428:43: sparse: sparse: cast truncates bits from constant value (c0000400 becomes 400)
vim +428 arch/x86/kernel/apm_32.c
c7425314c755d5 arch/x86/kernel/apm_32.c Akinobu Mita 2009-08-09 421
c7425314c755d5 arch/x86/kernel/apm_32.c Akinobu Mita 2009-08-09 422 /*
c7425314c755d5 arch/x86/kernel/apm_32.c Akinobu Mita 2009-08-09 423 * Set up a segment that references the real mode segment 0x40
c7425314c755d5 arch/x86/kernel/apm_32.c Akinobu Mita 2009-08-09 424 * that extends up to the end of page zero (that we have reserved).
c7425314c755d5 arch/x86/kernel/apm_32.c Akinobu Mita 2009-08-09 425 * This is for buggy BIOS's that refer to (real mode) segment 0x40
c7425314c755d5 arch/x86/kernel/apm_32.c Akinobu Mita 2009-08-09 426 * even though they are called in protected mode.
c7425314c755d5 arch/x86/kernel/apm_32.c Akinobu Mita 2009-08-09 427 */
c7425314c755d5 arch/x86/kernel/apm_32.c Akinobu Mita 2009-08-09 @428 static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(0x4092,
c7425314c755d5 arch/x86/kernel/apm_32.c Akinobu Mita 2009-08-09 429 (unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1);
^1da177e4c3f41 arch/i386/kernel/apm.c Linus Torvalds 2005-04-16 430
:::::: The code at line 428 was first introduced by commit
:::::: c7425314c755d5f94da7c978205c85a7c6201212 x86: Introduce GDT_ENTRY_INIT(), initialize bad_bios_desc statically
:::::: TO: Akinobu Mita <akinobu.mita@gmail.com>
:::::: CC: Ingo Molnar <mingo@elte.hu>
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
reply other threads:[~2020-05-10 14:04 UTC|newest]
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