[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-ID: <ZqqI349WxdejfXZM@slm.duckdns.org>
Date: Wed, 31 Jul 2024 08:56:31 -1000
From: Tejun Heo <tj@...nel.org>
To: David Vernet <void@...ifault.com>
Cc: linux-kernel@...r.kernel.org, kernel-team@...a.com
Subject: [PATCH sched_ext/for-6.12] sched_ext: Build fix on
!CONFIG_STACKTRACE[_SUPPORT]
scx_dump_task() uses stack_trace_save_tsk() which is only available when
CONFIG_STACKTRACE. Make CONFIG_SCHED_CLASS_EXT select CONFIG_STACKTRACE if
the support is available and skip capturing stack trace if
!CONFIG_STACKTRACE.
Signed-off-by: Tejun Heo <tj@...nel.org>
Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202407161844.reewQQrR-lkp@intel.com/
---
kernel/Kconfig.preempt | 1 +
kernel/sched/ext.c | 4 +++-
2 files changed, 4 insertions(+), 1 deletion(-)
--- a/kernel/Kconfig.preempt
+++ b/kernel/Kconfig.preempt
@@ -136,6 +136,7 @@ config SCHED_CORE
config SCHED_CLASS_EXT
bool "Extensible Scheduling Class"
depends on BPF_SYSCALL && BPF_JIT && DEBUG_INFO_BTF
+ select STACKTRACE if STACKTRACE_SUPPORT
help
This option enables a new scheduler class sched_ext (SCX), which
allows scheduling policies to be implemented as BPF programs to
--- a/kernel/sched/ext.c
+++ b/kernel/sched/ext.c
@@ -4334,7 +4334,7 @@ static void scx_dump_task(struct seq_buf
static unsigned long bt[SCX_EXIT_BT_LEN];
char dsq_id_buf[19] = "(n/a)";
unsigned long ops_state = atomic_long_read(&p->scx.ops_state);
- unsigned int bt_len;
+ unsigned int bt_len = 0;
if (p->scx.dsq)
scnprintf(dsq_id_buf, sizeof(dsq_id_buf), "0x%llx",
@@ -4359,7 +4359,9 @@ static void scx_dump_task(struct seq_buf
ops_dump_exit();
}
+#ifdef CONFIG_STACKTRACE
bt_len = stack_trace_save_tsk(p, bt, SCX_EXIT_BT_LEN, 1);
+#endif
if (bt_len) {
dump_newline(s);
dump_stack_trace(s, " ", bt, bt_len);
Powered by blists - more mailing lists