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kdb: Avoid array subscript warnings on non-SMP builds

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Recent versions of gcc (reported on gcc-7.4) issue array subscript
warnings for builds where SMP is not enabled.

kernel/debug/debug_core.c: In function 'kdb_dump_stack_on_cpu':
kernel/debug/debug_core.c:452:17: warning: array subscript is outside array
+bounds [-Warray-bounds]
     if (!(kgdb_info[cpu].exception_state & DCPU_IS_SLAVE)) {
           ~~~~~~~~~^~~~~
   kernel/debug/debug_core.c:469:33: warning: array subscript is outside array
+bounds [-Warray-bounds]
     kgdb_info[cpu].exception_state |= DCPU_WANT_BT;
   kernel/debug/debug_core.c:470:18: warning: array subscript is outside array
+bounds [-Warray-bounds]
     while (kgdb_info[cpu].exception_state & DCPU_WANT_BT)

There is no bug here but there is scope to improve the code
generation for non-SMP systems (whilst also silencing the warning).

Reported-by: kbuild test robot <lkp@intel.com>
Fixes: 2277b49258 ("kdb: Fix stack crawling on 'running' CPUs that aren't the master")
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Link: https://lore.kernel.org/r/20191021101057.23861-1-daniel.thompson@linaro.org
Reviewed-by: Douglas Anderson <dianders@chromium.org>
This commit is contained in:
Daniel Thompson 2019-10-21 11:10:56 +01:00
parent 2277b49258
commit d07ce4e32a
1 changed files with 1 additions and 1 deletions
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2
kernel/debug/debug_core.c
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@ -444,7 +444,7 @@ int dbg_remove_all_break(void)
#ifdef CONFIG_KGDB_KDB #ifdef CONFIG_KGDB_KDB
void kdb_dump_stack_on_cpu(int cpu) void kdb_dump_stack_on_cpu(int cpu)
{ {
if (cpu == raw_smp_processor_id()) { if (cpu == raw_smp_processor_id() || !IS_ENABLED(CONFIG_SMP)) {
dump_stack(); dump_stack();
return; return;
} }