9:26 p.m.
tree: https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
tglx.2020.05.05a
head: e6d36eed49b863bbe393e3c07cae737cd9c475e3
commit: ca303aa341bab5cdb3a3b41391ff262e252cd3f3 [105/140] x86/traps: Restructure #DB
handling
config: i386-tinyconfig (attached as .config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
reproduce:
git checkout ca303aa341bab5cdb3a3b41391ff262e252cd3f3
# save the attached .config to linux build tree
make ARCH=i386
If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp(a)intel.com>
Note: the rcu/tglx.2020.05.05a HEAD e6d36eed49b863bbe393e3c07cae737cd9c475e3 builds fine.
It only hurts bisectibility.
All errors (new ones prefixed by >>, old ones prefixed by <<):
arch/x86/kernel/traps.c: In function 'exc_debug_kernel':
> arch/x86/kernel/traps.c:819:24: error: 'tsk' undeclared
(first use in this function)
clear_tsk_thread_flag(tsk, TIF_BLOCKSTEP);
^~~
arch/x86/kernel/traps.c:819:24: note: each undeclared identifier is reported only once for
each function it appears in
arch/x86/kernel/traps.c: In function 'exc_debug_user':
arch/x86/kernel/traps.c:842:24: error: 'tsk' undeclared (first use in this
function)
clear_tsk_thread_flag(tsk, TIF_BLOCKSTEP);
^~~
vim +/tsk +819 arch/x86/kernel/traps.c
809
810 static __always_inline void exc_debug_kernel(struct pt_regs *regs,
811 unsigned long dr6)
812 {
813 nmi_enter();
814 /*
815 * The SDM says "The processor clears the BTF flag when it
816 * generates a debug exception." Clear TIF_BLOCKSTEP to keep
817 * TIF_BLOCKSTEP in sync with the hardware BTF flag.
818 */
819 clear_tsk_thread_flag(tsk, TIF_BLOCKSTEP);
820
821 /*
822 * Catch SYSENTER with TF set and clear DR_STEP. If this hit a
823 * watchpoint at the same time then that will still be handled.
824 */
825 if ((dr6 & DR_STEP) && is_sysenter_singlestep(regs))
826 dr6 &= ~DR_STEP;
827
828 /*
829 * If DR6 is zero, no point in trying to handle it. The kernel is
830 * not using INT1.
831 */
832 if (dr6)
833 handle_debug(regs, dr6, false);
834
835 nmi_exit();
836 }
837
---
0-DAY CI Kernel Test Service, Intel Corporation
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