From 9f0d88695ed6691a3e18c256d9d49862b3af6e34 Mon Sep 17 00:00:00 2001
From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Date: Wed, 5 Jun 2024 10:34:17 +0300
Subject: libcamera: dma_buf_allocator: Work around lack of memfd_create() in
 uClibc

uClibc doesn't provide a memfd_create() implementation. Fix it by using
a direct syscall when the function isn't available.

Fixes: ea4baaacc325 ("libcamera: DmaBufAllocator: Support allocating from /dev/udmabuf")
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
---
 src/libcamera/dma_buf_allocator.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/libcamera/dma_buf_allocator.cpp b/src/libcamera/dma_buf_allocator.cpp
index 5ec29949..d7d08e18 100644
--- a/src/libcamera/dma_buf_allocator.cpp
+++ b/src/libcamera/dma_buf_allocator.cpp
@@ -13,6 +13,7 @@
 #include <sys/ioctl.h>
 #include <sys/mman.h>
 #include <sys/stat.h>
+#include <sys/syscall.h>
 #include <sys/types.h>
 #include <unistd.h>
 
@@ -132,7 +133,11 @@ UniqueFD DmaBufAllocator::allocFromUDmaBuf(const char *name, std::size_t size)
 	std::size_t pageMask = sysconf(_SC_PAGESIZE) - 1;
 	size = (size + pageMask) & ~pageMask;
 
+#if HAVE_MEMFD_CREATE
 	int ret = memfd_create(name, MFD_ALLOW_SEALING | MFD_CLOEXEC);
+#else
+	int ret = syscall(SYS_memfd_create, name, MFD_ALLOW_SEALING | MFD_CLOEXEC);
+#endif
 	if (ret < 0) {
 		ret = errno;
 		LOG(DmaBufAllocator, Error)
-- 
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