linux-kernel - [PATCH 3/3] powerpc: print right preemption model in die

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Message-ID: <20241125042212.1522315-4-sshegde@linux.ibm.com>
Date: Mon, 25 Nov 2024 09:52:12 +0530
From: Shrikanth Hegde <sshegde@...ux.ibm.com>
To: mpe@...erman.id.au, linuxppc-dev@...ts.ozlabs.org
Cc: sshegde@...ux.ibm.com, npiggin@...il.com, christophe.leroy@...roup.eu,
        maddy@...ux.ibm.com, bigeasy@...utronix.de, ankur.a.arora@...cle.com,
        linux-kernel@...r.kernel.org, mark.rutland@....com,
        vschneid@...hat.com, peterz@...radead.org
Subject: [PATCH 3/3] powerpc: print right preemption model in die

Preemption models can change at runtime with dynamic preemption in 
place. So need to use the right methods instead of relying on
CONFIG_PREEMPT to decide whether its full preemption or not. 

While there, fix it to print preemption model correctly. 

Signed-off-by: Shrikanth Hegde <sshegde@...ux.ibm.com> 
---
 arch/powerpc/kernel/traps.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index edf5cabe5dfd..2556fa8ec019 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -266,7 +266,11 @@ static int __die(const char *str, struct pt_regs *regs, long err)
 	printk("%s PAGE_SIZE=%luK%s%s%s%s%s%s %s\n",
 	       IS_ENABLED(CONFIG_CPU_LITTLE_ENDIAN) ? "LE" : "BE",
 	       PAGE_SIZE / 1024, get_mmu_str(),
-	       IS_ENABLED(CONFIG_PREEMPT) ? " PREEMPT" : "",
+	       preempt_model_none()      ? "none" :
+	       preempt_model_voluntary() ? "voluntary" :
+	       preempt_model_full()      ? "full" :
+	       preempt_model_lazy()      ? "lazy" :
+	       "",
 	       IS_ENABLED(CONFIG_SMP) ? " SMP" : "",
 	       IS_ENABLED(CONFIG_SMP) ? (" NR_CPUS=" __stringify(NR_CPUS)) : "",
 	       debug_pagealloc_enabled() ? " DEBUG_PAGEALLOC" : "",
-- 
2.39.3