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From: Shrikanth Hegde <sshegde@linux.ibm.com>
To: mpe@ellerman.id.au, linuxppc-dev@lists.ozlabs.org
Cc: sshegde@linux.ibm.com, npiggin@gmail.com,
	christophe.leroy@csgroup.eu, maddy@linux.ibm.com,
	bigeasy@linutronix.de, ankur.a.arora@oracle.com,
	linux-kernel@vger.kernel.org, mark.rutland@arm.com,
	vschneid@redhat.com, peterz@infradead.org
Subject: [PATCH 3/3] powerpc: print right preemption model in die
Date: Mon, 25 Nov 2024 09:52:12 +0530	[thread overview]
Message-ID: <20241125042212.1522315-4-sshegde@linux.ibm.com> (raw)
In-Reply-To: <20241125042212.1522315-1-sshegde@linux.ibm.com>

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@linux.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


  parent reply	other threads:[~2024-11-25  4:23 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-11-25  4:22 [PATCH 0/3] powerpc: Enable dynamic preemption Shrikanth Hegde
2024-11-25  4:22 ` [PATCH 1/3] powerpc: copy preempt.h into arch/include/asm Shrikanth Hegde
2024-11-26 10:49   ` Christophe Leroy
2024-11-27  6:37   ` Christophe Leroy
2024-12-02 14:05     ` Shrikanth Hegde
2024-12-02 18:17       ` Christophe Leroy
2024-12-03 14:00         ` Shrikanth Hegde
2024-12-03 19:47           ` Christophe Leroy
2024-11-25  4:22 ` [PATCH 2/3] powerpc: support dynamic preemption Shrikanth Hegde
2024-11-26 10:48   ` Christophe Leroy
2024-11-26 11:15     ` Shrikanth Hegde
2024-11-27  6:28       ` Christophe Leroy
2024-11-27  6:44   ` Christophe Leroy
2024-12-01 19:45     ` Shrikanth Hegde
2024-12-03 19:53       ` Christophe Leroy
2024-11-25  4:22 ` Shrikanth Hegde [this message]
2024-12-04  6:44   ` [PATCH 3/3] powerpc: print right preemption model in die Christophe Leroy

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