From 0561b55860f655a863dabc653e5db7b213d8abff Mon Sep 17 00:00:00 2001
From: hujun5 <hujun5@xiaomi.com>
Date: Thu, 28 Mar 2024 09:32:14 +0800
Subject: [PATCH] arm: optimize up_interrupt_context used in armv[6/7/8]-m

resson:
using percpu storage for g_current_regs or leveraging interrupt status
registers to determine if code is running within an interrupt context can enhance performance.

Signed-off-by: hujun5 <hujun5@xiaomi.com>
---
 arch/arm/include/armv6-m/irq.h | 12 +-----------
 arch/arm/include/armv7-m/irq.h | 12 +-----------
 arch/arm/include/armv8-m/irq.h | 12 +-----------
 3 files changed, 3 insertions(+), 33 deletions(-)

diff --git a/arch/arm/include/armv6-m/irq.h b/arch/arm/include/armv6-m/irq.h
index ee40eb119b..752e3ed394 100644
--- a/arch/arm/include/armv6-m/irq.h
+++ b/arch/arm/include/armv6-m/irq.h
@@ -394,17 +394,7 @@ static inline_function void up_set_current_regs(uint32_t *regs)
 noinstrument_function
 static inline_function bool up_interrupt_context(void)
 {
-#ifdef CONFIG_SMP
-  irqstate_t flags = up_irq_save();
-#endif
-
-  bool ret = up_current_regs() != NULL;
-
-#ifdef CONFIG_SMP
-  up_irq_restore(flags);
-#endif
-
-  return ret;
+  return getipsr() != 0;
 }
 
 /****************************************************************************
diff --git a/arch/arm/include/armv7-m/irq.h b/arch/arm/include/armv7-m/irq.h
index 53900703b7..88db5d3ba3 100644
--- a/arch/arm/include/armv7-m/irq.h
+++ b/arch/arm/include/armv7-m/irq.h
@@ -599,17 +599,7 @@ static inline_function void up_set_current_regs(uint32_t *regs)
 noinstrument_function
 static inline_function bool up_interrupt_context(void)
 {
-#ifdef CONFIG_SMP
-  irqstate_t flags = up_irq_save();
-#endif
-
-  bool ret = up_current_regs() != NULL;
-
-#ifdef CONFIG_SMP
-  up_irq_restore(flags);
-#endif
-
-  return ret;
+  return getipsr() != 0;
 }
 
 /****************************************************************************
diff --git a/arch/arm/include/armv8-m/irq.h b/arch/arm/include/armv8-m/irq.h
index 69763c8664..f14d84f655 100644
--- a/arch/arm/include/armv8-m/irq.h
+++ b/arch/arm/include/armv8-m/irq.h
@@ -572,17 +572,7 @@ static inline_function void up_set_current_regs(uint32_t *regs)
 noinstrument_function
 static inline_function bool up_interrupt_context(void)
 {
-#ifdef CONFIG_SMP
-  irqstate_t flags = up_irq_save();
-#endif
-
-  bool ret = up_current_regs() != NULL;
-
-#ifdef CONFIG_SMP
-  up_irq_restore(flags);
-#endif
-
-  return ret;
+  return getipsr() != 0;
 }
 
 /****************************************************************************