unix: update to Linux 6.11

Change-Id: I1cc777822da1b557e69634faade8e24d06c00ce8
GitHub-Last-Rev: d09238ecd0989901b5d92e7a0ae2556c6e441d27
GitHub-Pull-Request: golang/sys#218
Reviewed-on: https://go-review.googlesource.com/c/sys/+/613855
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>

unix/linux/Dockerfile

@@ -15,8 +15,8 @@ RUN apt-get update && apt-get install -y  --no-install-recommends \
 # Get the git sources. If not cached, this takes O(5 minutes).
 WORKDIR /git
 RUN git config --global advice.detachedHead false
-# Linux Kernel: Released 14 July 2024
-RUN git clone --branch v6.10 --depth 1 https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux
+# Linux Kernel: Released 15 Sep 2024
+RUN git clone --branch v6.11 --depth 1 https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux
 # GNU C library: Released 21 July 2024
 RUN git clone --branch release/2.40/master --depth 1 https://sourceware.org/git/glibc.git
 

unix/linux/mksysnum.go

@@ -8,6 +8,7 @@ package main
 
 import (
 	"bufio"
+	"bytes"
 	"fmt"
 	"os"
 	"os/exec"
@@ -125,6 +126,19 @@ func main() {
 		fmt.Fprintf(os.Stderr, "can't run %s", cc)
 		os.Exit(1)
 	}
+
+	switch goarch {
+	case "riscv64", "loong64", "arm64":
+		// Kernel linux v6.11 removed some __NR_* macros that only
+		// existed on some architectures as an implementation detail. In
+		// order to keep backwards compatibility we add them back.
+		//
+		// See https://lkml.org/lkml/2024/8/5/1283.
+		if !bytes.Contains(cmd, []byte("#define __NR_arch_specific_syscall")) {
+			cmd = append(cmd, []byte("#define __NR_arch_specific_syscall 244\n")...)
+		}
+	}
+
 	s := bufio.NewScanner(strings.NewReader(string(cmd)))
 	var offset, prev, asOffset int
 	var nums syscallNums