Apply patch for kernel 6.8

From GitHub [Pull Request #26][0].  Fixes compiling the driver on Kernel
6.8 (Fedora 39 and 40).

[0]: https://github.com/google/gasket-driver/pull/26

0001-fixed-eventfd_signal-for-kernels-6.8.patch

@@ -0,0 +1,30 @@
+From 2b0e08974e486002a70616f3c272ffb2203e044b Mon Sep 17 00:00:00 2001
+From: Robert Zaage <robert@zaage.it>
+Date: Tue, 9 Apr 2024 22:47:40 +0200
+Subject: [PATCH] fixed eventfd_signal for kernels >= 6.8
+
+---
+ src/gasket_interrupt.c | 10 +++++++---
+ 1 file changed, 7 insertions(+), 3 deletions(-)
+
+diff --git a/src/gasket_interrupt.c b/src/gasket_interrupt.c
+index 531d94e..3f8339c 100644
+--- a/src/gasket_interrupt.c
++++ b/src/gasket_interrupt.c
+@@ -157,9 +157,13 @@ gasket_handle_interrupt(struct gasket_interrupt_data *interrupt_data,
+ 	trace_gasket_interrupt_event(interrupt_data->name, interrupt_index);
+ 	read_lock(&interrupt_data->eventfd_ctx_lock);
+ 	ctx = interrupt_data->eventfd_ctxs[interrupt_index];
+-	if (ctx)
+-		eventfd_signal(ctx, 1);
+-	read_unlock(&interrupt_data->eventfd_ctx_lock);
++        if (ctx)
++                #if LINUX_VERSION_CODE >= KERNEL_VERSION(6,8,0)
++                        eventfd_signal(ctx);
++                #else
++                        eventfd_signal(ctx, 1);
++                #endif
++        read_unlock(&interrupt_data->eventfd_ctx_lock);
+ 
+ 	++(interrupt_data->interrupt_counts[interrupt_index]);
+ }

Containerfile

@@ -23,6 +23,8 @@ USER 101:101
 
 # Build the gasket kernel module
 RUN git clone https://github.com/google/gasket-driver.git /usr/src/gasket-driver
+COPY *.patch /usr/src/gasket-driver
+RUN cd /usr/src/gasket-driver && git am *.patch
 RUN make \
 	-C /usr/src/kernels/$(rpm -q --qf %{V}-%{R}.%{ARCH} kernel-devel) \
 	M=/usr/src/gasket-driver/src \