quoted

quoted

Once in a while, booting an IBM POWER9 PowerNV system (8335-GTH) would generate
a warning in lockdep_register_key() at,

if (WARN_ON_ONCE(static_obj(key)))

because

key = 0xc0000000019ad118
&_stext = 0xc000000000000000
&_end = 0xc0000000049d0000

i.e., it will cause static_obj() returns 1.

(back from a trip)

Hi Qian,

Does this mean that on POWER9 it can happen that a dynamically allocated 
object has an address that falls between &_stext and &_end?

I thought that was true on all arches due to initmem, but seems not.

I guess we have the same problem as s390 and we need to define
arch_is_kernel_initmem_freed().

Qian, can you try this:

diff --git a/arch/powerpc/include/asm/sections.h b/arch/powerpc/include/asm/sections.h
index 4a1664a8658d..616b1b7b7e52 100644
--- a/arch/powerpc/include/asm/sections.h
+++ b/arch/powerpc/include/asm/sections.h

@@ -5,8 +5,22 @@
 
 #include <linux/elf.h>
 #include <linux/uaccess.h>
+
+#define arch_is_kernel_initmem_freed arch_is_kernel_initmem_freed
+
 #include <asm-generic/sections.h>
 
+extern bool init_mem_is_free;
+
+static inline int arch_is_kernel_initmem_freed(unsigned long addr)
+{
+	if (!init_mem_is_free)
+		return 0;
+
+	return addr >= (unsigned long)__init_begin &&
+		addr < (unsigned long)__init_end;
+}
+
 extern char __head_end[];
 
 #ifdef __powerpc64__