From 3576e54d79474ab83a220d3296f82174d6e3e333 Mon Sep 17 00:00:00 2001
From: Darian Leung <darian@espressif.com>
Date: Tue, 26 Feb 2019 20:58:02 +0800
Subject: [PATCH] freertos: Make xPortGetCoreID() volatile

When xPortGetCoreID() is called twice within a function,
it might only be called once after compilation. This
commit makes the inline assembly of the function volatile.

Closes #3093
---
 components/freertos/include/freertos/portable.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/components/freertos/include/freertos/portable.h b/components/freertos/include/freertos/portable.h
index 33b740e89..ce189f31c 100644
--- a/components/freertos/include/freertos/portable.h
+++ b/components/freertos/include/freertos/portable.h
@@ -205,7 +205,7 @@ BaseType_t xPortInterruptedFromISRContext();
 /* Multi-core: get current core ID */
 static inline uint32_t IRAM_ATTR xPortGetCoreID() {
     int id;
-    __asm__ (
+    __asm__ __volatile__ (
         "rsr.prid %0\n"
         " extui %0,%0,13,1"
         :"=r"(id));