From 778bc455586d2b53d76e054190a45d6614347d76 Mon Sep 17 00:00:00 2001
From: Wim Taymans <wtaymans@redhat.com>
Date: Tue, 19 Jan 2021 10:51:50 +0100
Subject: [PATCH] mem: add LOCKED flag to mlock the mapped memory

---
 src/pipewire/mem.c | 3 +++
 src/pipewire/mem.h | 1 +
 2 files changed, 4 insertions(+)

diff --git a/src/pipewire/mem.c b/src/pipewire/mem.c
index 2f2a130f1..d9f65f779 100644
--- a/src/pipewire/mem.c
+++ b/src/pipewire/mem.c
@@ -296,6 +296,9 @@ static struct mapping * memblock_map(struct memblock *b,
 	else
 		fl |= MAP_SHARED;
 
+	if (flags & PW_MEMMAP_FLAG_LOCKED)
+		fl |= MAP_LOCKED;
+
 	if (flags & PW_MEMMAP_FLAG_TWICE) {
 		pw_log_error(NAME" %p: implement me PW_MEMMAP_FLAG_TWICE", p);
 		errno = ENOTSUP;
diff --git a/src/pipewire/mem.h b/src/pipewire/mem.h
index b1751819a..a695e9814 100644
--- a/src/pipewire/mem.h
+++ b/src/pipewire/mem.h
@@ -51,6 +51,7 @@ enum pw_memmap_flags {
 	PW_MEMMAP_FLAG_TWICE =		(1 << 2),	/**< map the same area twice after each other,
 							  *  creating a circular ringbuffer */
 	PW_MEMMAP_FLAG_PRIVATE =	(1 << 3),	/**< writes will be private */
+	PW_MEMMAP_FLAG_LOCKED =		(1 << 4),	/**< lock the memory into RAM */
 	PW_MEMMAP_FLAG_READWRITE = PW_MEMMAP_FLAG_READ | PW_MEMMAP_FLAG_WRITE,
 };