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[v2,3/3] riscv: Support BUG() in kernel module

Message ID 1551756215-22299-4-git-send-email-vincentc@andestech.com (mailing list archive)
State New, archived
Headers show
Series riscv: Support trap-based WARN() and fix bug in do_trap_break | expand

Commit Message

Vincent Chen March 5, 2019, 3:23 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(-)
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Patch

diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c
index 0cd0137..9551388 100644
--- a/arch/riscv/kernel/traps.c
+++ b/arch/riscv/kernel/traps.c
@@ -156,7 +156,7 @@  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;