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[v7,04/14] MIPS: traps: Give more explanations if ebase doesn't belong to KSEG0

Message ID 20240205153503.574468-5-gregory.clement@bootlin.com (mailing list archive)
State Superseded
Headers show
Series Add support for the Mobileye EyeQ5 SoC | expand

Commit Message

Gregory CLEMENT Feb. 5, 2024, 3:34 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(-)
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Patch

diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index 355d0f0709de8..911d2233d6d0b 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -2347,10 +2347,13 @@  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) {