The kernel module is loaded into vmalloc region which is located below
to the PAGE_OFFSET. Hence the condition, pc < PAGE_OFFSET, in the
is_valid_bugaddr() will filter out all trap exceptions triggered
by kernel module. To support BUG() in kernel module, the condition is
changed to pc < VMALLOC_START.
Signed-off-by: Vincent Chen <vince...@andestech.com>
---
arch/riscv/kernel/traps.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c
index deae0e5..dee0e5e 100644
--- a/arch/riscv/kernel/traps.c
+++ b/arch/riscv/kernel/traps.c
@@ -144,7 +144,7 @@ int is_valid_bugaddr(unsigned long pc)
{
bug_insn_t insn;
- if (pc < PAGE_OFFSET)
+ if (pc < VMALLOC_START)
return 0;
if (probe_kernel_address((bug_insn_t *)pc, insn))
return 0;
--
1.7.1
