[core] Inline InterruptLock on ESP8266 (#22455)

esphome/components/esp8266/helpers.cpp

@@ -4,8 +4,6 @@
 
 #include <osapi.h>
 #include <user_interface.h>
-// for xt_rsil()/xt_wsr_ps()
-#include <Arduino.h>
 
 namespace esphome {
 
@@ -15,9 +13,6 @@ bool random_bytes(uint8_t *data, size_t len) { return os_get_random(data, len) =
 // ESP8266 Mutex is defined inline as a no-op in helpers.h when USE_ESP8266 (or USE_RP2) is set,
 // independent of the ESPHOME_THREAD_SINGLE thread model define.
 
-IRAM_ATTR InterruptLock::InterruptLock() { state_ = xt_rsil(15); }
-IRAM_ATTR InterruptLock::~InterruptLock() { xt_wsr_ps(state_); }
-
 // ESP8266 LwIPLock is defined inline as a no-op in helpers.h
 
 void get_mac_address_raw(uint8_t *mac) {  // NOLINT(readability-non-const-parameter)

esphome/core/helpers.h

@@ -29,6 +29,7 @@
 
 #ifdef USE_ESP8266
 #include <Esp.h>
+#include <core_esp8266_features.h>  // xt_rsil, xt_wsr_ps
 #include <pgmspace.h>
 #endif
 
@@ -2319,8 +2320,14 @@ class LockGuard {
  */
 class InterruptLock {
  public:
+#ifdef USE_ESP8266
+  // Inline: saves two calls per lock, and the lock sits on bit-banged timing paths
+  ESPHOME_ALWAYS_INLINE InterruptLock() : state_(xt_rsil(15)) {}
+  ESPHOME_ALWAYS_INLINE ~InterruptLock() { xt_wsr_ps(this->state_); }
+#else
   InterruptLock();
   ~InterruptLock();
+#endif
 
  protected:
 #if defined(USE_ESP8266) || defined(USE_RP2) || defined(USE_ZEPHYR)