From dea3fe123432b2638e8399ab6d1a8a20fc7a5961 Mon Sep 17 00:00:00 2001
From: Roy <roy@uefi-x86>
Date: Thu, 30 Jan 2025 22:45:48 +0100
Subject: [PATCH] PREEMPT_RT became mainline since 6.12, but the indicator
 /sys/kernel/realtime did not make it (until now). This commit removes this
 check, I don't think that it's needed since it still looks for PREEMPT_RT
 from uname.

---
 src/rtapi/uspace_common.h | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/src/rtapi/uspace_common.h b/src/rtapi/uspace_common.h
index 88eb2c5dc47..8e8f6f3f537 100644
--- a/src/rtapi/uspace_common.h
+++ b/src/rtapi/uspace_common.h
@@ -351,8 +351,7 @@ static int _rtapi_is_realtime = -1;
 #ifdef __linux__
 static int detect_preempt_rt() {
     struct utsname u;
-    int crit1, crit2 = 0;
-    FILE *fd;
+    int crit1 = 0;
 
     uname(&u);
     crit1 = strcasestr (u.version, "PREEMPT RT") != 0;
@@ -360,13 +359,7 @@ static int detect_preempt_rt() {
     //"PREEMPT_RT" is used in the version string instead of "PREEMPT RT" starting with kernel version 5.4
     crit1 = crit1 || (strcasestr(u.version, "PREEMPT_RT") != 0);
 
-    if ((fd = fopen("/sys/kernel/realtime","r")) != NULL) {
-        int flag;
-        crit2 = ((fscanf(fd, "%d", &flag) == 1) && (flag == 1));
-        fclose(fd);
-    }
-
-    return crit1 && crit2;
+    return crit1;
 }
 #else
 static int detect_preempt_rt() {