linux-kernel - [PATCH] MIPS: cpu-features: Use boot_cpu

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Date:   Wed,  7 Jun 2023 13:51:22 +0800
From:   Jiaxun Yang <jiaxun.yang@...goat.com>
To:     linux-mips@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, tsbogend@...ha.franken.de,
        Jiaxun Yang <jiaxun.yang@...goat.com>, stable@...r.kernel.org
Subject: [PATCH] MIPS: cpu-features: Use boot_cpu_type for CPU type based features

Some CPU feature macros were using current_cpu_type to mark feature
availability.

However current_cpu_type will use smp_processor_id, which is prohibited
under preemptable context.

Since those features are all uniform on all CPUs in a SMP system, use
boot_cpu_type instead of current_cpu_type to fix preemptable kernel.

Cc: stable@...r.kernel.org
Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
---
 arch/mips/include/asm/cpu-features.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/mips/include/asm/cpu-features.h b/arch/mips/include/asm/cpu-features.h
index 2a0b90077b50..8c6d4a87db37 100644
--- a/arch/mips/include/asm/cpu-features.h
+++ b/arch/mips/include/asm/cpu-features.h
@@ -125,7 +125,7 @@
 ({									\
 	int __res;							\
 									\
-	switch (current_cpu_type()) {					\
+	switch (boot_cpu_type()) {					\
 	case CPU_CAVIUM_OCTEON:						\
 	case CPU_CAVIUM_OCTEON_PLUS:					\
 	case CPU_CAVIUM_OCTEON2:					\
@@ -373,7 +373,7 @@
 ({									\
 	int __res;							\
 									\
-	switch (current_cpu_type()) {					\
+	switch (boot_cpu_type()) {					\
 	case CPU_M14KC:							\
 	case CPU_74K:							\
 	case CPU_1074K:							\
-- 
2.39.2 (Apple Git-143)