uname: add KernelVersionGE

...together with some simple tests.

This is a subset of https://go-review.googlesource.com/c/go/+/700796
(currently in review).

Signed-off-by: Kir Kolyshkin <[email protected]>

Author: kolyshkin

uname/kernel_version_ge.go

@@ -0,0 +1,11 @@
+// Copyright 2025 The uname Authors.
+
+package uname
+
+// KernelVersionGE checks if the running kernel version
+// is greater than or equal to the provided version.
+func KernelVersionGE(x, y int) bool {
+	xx, yy := KernelVersion()
+
+	return xx > x || (xx == x && yy >= y)
+}

uname/kernel_version_ge_test.go

@@ -0,0 +1,64 @@
+// Copyright 2025 The uname Authors.
+
+package uname
+
+import (
+	"testing"
+)
+
+func TestKernelVersionGE(t *testing.T) {
+	major, minor := KernelVersion()
+	t.Logf("Running on kernel %d.%d", major, minor)
+
+	tests := []struct {
+		name string
+		x, y int
+		want bool
+	}{
+		{
+			name: "current version equals itself",
+			x:    major,
+			y:    minor,
+			want: true,
+		},
+		{
+			name: "older major version",
+			x:    major - 1,
+			y:    0,
+			want: true,
+		},
+		{
+			name: "same major, older minor version",
+			x:    major,
+			y:    minor - 1,
+			want: true,
+		},
+		{
+			name: "newer major version",
+			x:    major + 1,
+			y:    0,
+			want: false,
+		},
+		{
+			name: "same major, newer minor version",
+			x:    major,
+			y:    minor + 1,
+			want: false,
+		},
+		{
+			name: "min version (0.0)",
+			x:    0,
+			y:    0,
+			want: true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := KernelVersionGE(tt.x, tt.y)
+			if got != tt.want {
+				t.Errorf("KernelVersionGE(%d, %d): got %v, want %v", tt.x, tt.y, got, tt.want)
+			}
+		})
+	}
+}