Messages in this thread | | | Date | Tue, 2 Jun 2020 10:26:20 +0800 | From | kbuild test robot <> | Subject | arch/x86/kernel/apm_32.c:428:43: sparse: sparse: cast truncates bits from constant value (b0000400 becomes 400) |
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tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: f359287765c04711ff54fbd11645271d8e5ff763 commit: 1651e700664b4597ddf4f8adfe435252a0d11277 x86: Fix bitops.h warning with a moved cast date: 3 months ago config: i386-randconfig-s002-20200602 (attached as .config) compiler: gcc-9 (Debian 9.3.0-13) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.1-243-gc100a7ab-dirty git checkout 1651e700664b4597ddf4f8adfe435252a0d11277 # save the attached .config to linux build tree make W=1 C=1 ARCH=i386 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 (b0000400 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>
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