rk3568 rt init

hc

2023-11-06 e3e12f52b214121840b44c91de5b3e5af5d3eb84

 kernel/fs/namespace.c
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@@ -14,6 +14,7 @@
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 #include <linux/mnt_namespace.h>
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 #include <linux/user_namespace.h>
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 #include <linux/namei.h>
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+#include <linux/delay.h>
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 #include <linux/security.h>
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 #include <linux/cred.h>
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 #include <linux/idr.h>
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@@ -328,8 +329,11 @@
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 	 * incremented count after it has set MNT_WRITE_HOLD.
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 	 */
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 	smp_mb();
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-	while (READ_ONCE(mnt->mnt.mnt_flags) & MNT_WRITE_HOLD)
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-		cpu_relax();
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+	while (READ_ONCE(mnt->mnt.mnt_flags) & MNT_WRITE_HOLD) {
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+		preempt_enable();
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+		cpu_chill();
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+		preempt_disable();
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+	}
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 	/*
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 	 * After the slowpath clears MNT_WRITE_HOLD, mnt_is_readonly will
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 	 * be set to match its requirements. So we must not load that until