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 <l...@intel.com>
Fixes: 2277b492582d ("kdb: Fix stack crawling on 'running' CPUs that aren't the
master")
Signed-off-by: Daniel Thompson <daniel.thomp...@linaro.org>
---
Notes:
Changes in v2:
- Moved the IS_ENABLED(CONFIG_SMP) test to the first (slightly easier
to read the code, improves code generation a little)
- Sent out as a proper patch e-mail ;-)
kernel/debug/debug_core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c
index 70e86b4b4932..2b7c9b67931d 100644
--- a/kernel/debug/debug_core.c
+++ b/kernel/debug/debug_core.c
@@ -444,7 +444,7 @@ int dbg_remove_all_break(void)
#ifdef CONFIG_KGDB_KDB
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();
return;
}
--
2.21.0
