diff mbox series

[2/3] riscv: Support BUG() in kernel module

Message ID 1551349891-22683-3-git-send-email-vincentc@andestech.com (mailing list archive)
State New, archived
Headers show
Series riscv: Fix debug instruction check and support trap-based WARN() | expand

Commit Message

Vincent Chen Feb. 28, 2019, 10:31 a.m. UTC 
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 <vincentc@andestech.com>
---
 arch/riscv/kernel/traps.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
diff mbox series

Patch

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;