diff mbox series

[v8,04/14] MIPS: traps: Give more explanations if ebase doesn't belong to KSEG0

Message ID 20240216174227.409400-5-gregory.clement@bootlin.com (mailing list archive)
State Accepted
Commit 524aa6b17ab5ebb55ad909fbc2ac6cda0995e0db
Headers show
Series Add support for the Mobileye EyeQ5 SoC | expand

Commit Message

Gregory CLEMENT Feb. 16, 2024, 5:42 p.m. UTC 
With the expanded support for placing the kernel in XPHYS rather than
just KSEG0, scenarios where ebase doesn't belong to KSEG0 are more
likely to occur. In such cases, we currently experience a substantial
and perplexing stack dump without any accompanying explanation. To
rectify this, we aim to replace the uninformative stack dump with a
warning that offers a clear explanation of the issue.

Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
---
 arch/mips/kernel/traps.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index 075bb08543eca..a9644c5e7ef4d 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -2345,10 +2345,13 @@  void __init trap_init(void)
 		 * EVA is special though as it allows segments to be rearranged
 		 * and to become uncached during cache error handling.
 		 */
-		if (!IS_ENABLED(CONFIG_EVA) && !WARN_ON(ebase_pa >= 0x20000000))
+		if (!IS_ENABLED(CONFIG_EVA) && ebase_pa < 0x20000000)
 			ebase = CKSEG0ADDR(ebase_pa);
 		else
 			ebase = (unsigned long)phys_to_virt(ebase_pa);
+		if (ebase_pa >= 0x20000000)
+			pr_warn("ebase(%pa) should better be in KSeg0",
+				&ebase_pa);
 	}
 
 	if (cpu_has_mmips) {