From 3e5c2585e13fcc1f29c399fc19298c3521f6e4e1 Mon Sep 17 00:00:00 2001
From: David Carlier <devnexen@gmail.com>
Date: Tue, 20 Dec 2022 10:01:49 +0000
Subject: [PATCH] adding KERNEL_VERSION macro for linux.

---
 libc-test/semver/linux.txt | 1 +
 src/unix/linux_like/mod.rs | 7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/libc-test/semver/linux.txt b/libc-test/semver/linux.txt
index 087b1fc10c586..688dbd4778b7f 100644
--- a/libc-test/semver/linux.txt
+++ b/libc-test/semver/linux.txt
@@ -1146,6 +1146,7 @@ J1939_PGN_ADDRESS_COMMANDED
 J1939_PGN_MAX
 J1939_PGN_PDU1_MAX
 J1939_PGN_REQUEST
+KERNEL_VERSION
 KEYCTL_ASSUME_AUTHORITY
 KEYCTL_CHOWN
 KEYCTL_CLEAR
diff --git a/src/unix/linux_like/mod.rs b/src/unix/linux_like/mod.rs
index 8e738d87b889f..b7a53ddf2ec1c 100644
--- a/src/unix/linux_like/mod.rs
+++ b/src/unix/linux_like/mod.rs
@@ -1615,6 +1615,13 @@ safe_f! {
     pub {const} fn IPTOS_ECN(x: u8) -> u8 {
         x & ::IPTOS_ECN_MASK
     }
+
+    pub {const} fn KERNEL_VERSION(a: u32, b: u32, c: u32) -> u32 {
+        ((a << 16) + (b << 8)) + match c {
+            0 ..= 255 => c,
+            _ => 255,
+        }
+    }
 }
 
 extern "C" {