[PATCH 03/20] headers: add kstrtox.h backport

From: Yi Cong <[email protected]>

The separate <linux/kstrtox.h> header was introduced in v5.14
(commit 29b25d81ef62).  Before that, kstrto*() declarations live
in <linux/kernel.h>.

Provide a compatibility wrapper that includes <linux/kernel.h> on
kernels older than v5.14.

Signed-off-by: Yi Cong <[email protected]>
---
 backport/backport-include/linux/kstrtox.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 backport/backport-include/linux/kstrtox.h

diff --git a/backport/backport-include/linux/kstrtox.h b/backport/backport-include/linux/kstrtox.h
new file mode 100644
index 00000000..a17d072b
--- /dev/null
+++ b/backport/backport-include/linux/kstrtox.h
@@ -0,0 +1,17 @@
+#ifndef __BACKPORT_KSTRTOX_H
+#define __BACKPORT_KSTRTOX_H
+#include <linux/version.h>
+
+#if LINUX_VERSION_IS_LESS(5,14,0)
+/*
+ * Before Linux 5.14, kstrto* functions were declared in linux/kernel.h.
+ * The separate linux/kstrtox.h header was introduced in commit
+ * 29b25d81ef62 ("lib/kstrtox: move kstrto*() from lib/cmdline.c to
+ * lib/kstrtox.c, add tests").
+ */
+#include <linux/kernel.h>
+#else
+#include_next <linux/kstrtox.h>
+#endif
+
+#endif /* __BACKPORT_KSTRTOX_H */
-- 
2.43.0