From: Vincent Chen <vincentc@andestech.com>
Date: Tue, 5 Mar 2019 03:23:35 +0000 (+0800)
Subject: riscv: Support BUG() in kernel module
X-Git-Tag: v5.15~6313^2~4
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=9a6e7af02f7fcc8c68e9d6ce167ee6ab0052cb60;p=platform%2Fkernel%2Flinux-starfive.git

riscv: Support BUG() in kernel module

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>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
---

diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c
index c34cc54..3d1a651 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;