@@ -200,6 +200,18 @@ kgdb_arch_handle_qxfer_pkt(char *remcom_in_buffer,
extern void kgdb_call_nmi_hook(void *ignored);
/**
+ * kgdb_smp_call_nmi_hook - Provide default fallback mechanism to
+ * round-up CPUs
+ *
+ * If you're using the default implementation of kgdb_roundup_cpus()
+ * this function will be called. And if an arch detects at runtime to
+ * not support NMI based roundup then it can fallback to default
+ * mechanism using this API.
+ */
+
+extern void kgdb_smp_call_nmi_hook(void);
+
+/**
* kgdb_roundup_cpus - Get other CPUs into a holding pattern
*
* On SMP systems, we need to get the attention of the other CPUs
@@ -241,7 +241,7 @@ void __weak kgdb_call_nmi_hook(void *ignored)
}
NOKPROBE_SYMBOL(kgdb_call_nmi_hook);
-void __weak kgdb_roundup_cpus(void)
+void kgdb_smp_call_nmi_hook(void)
{
call_single_data_t *csd;
int this_cpu = raw_smp_processor_id();
@@ -273,6 +273,12 @@ void __weak kgdb_roundup_cpus(void)
kgdb_info[cpu].rounding_up = false;
}
}
+NOKPROBE_SYMBOL(kgdb_smp_call_nmi_hook);
+
+void __weak kgdb_roundup_cpus(void)
+{
+ kgdb_smp_call_nmi_hook();
+}
NOKPROBE_SYMBOL(kgdb_roundup_cpus);
#endif
Add a new API kgdb_smp_call_nmi_hook() to expose default CPUs roundup mechanism to a particular archichecture as a runtime fallback if it detects to not support NMI roundup. Currently such an architecture example is arm64 supporting pseudo NMIs feature which is only available on platforms which have support for GICv3 or later version. Signed-off-by: Sumit Garg <sumit.garg@linaro.org> --- include/linux/kgdb.h | 12 ++++++++++++ kernel/debug/debug_core.c | 8 +++++++- 2 files changed, 19 insertions(+), 1 deletion(-)