Add 'slice_control' feature to the ABI Introduced in Linux v7.0, add it to our ABI header. Change-Id: I27280ccf98e25fb8fab3cdc85d273220d9f6df7d Signed-off-by: Michael Jeanson <mjeanson@efficios.com> Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

diff --git a/include/rseq/abi.h b/include/rseq/abi.h
index 9be5659..fd4963e 100644
--- a/include/rseq/abi.h
+++ b/include/rseq/abi.h

@@ -58,6 +58,27 @@
 	__u64 abort_ip;
 } __attribute__((aligned(4 * sizeof(__u64))));
 
+/**
+ * rseq_slice_ctrl - Time slice extension control structure
+ * @all:        Compound value
+ * @request:    Request for a time slice extension
+ * @granted:    Granted time slice extension
+ *
+ * @request is set by user space and can be cleared by user space or kernel
+ * space.  @granted is set and cleared by the kernel and must only be read
+ * by user space.
+ */
+struct rseq_abi_slice_ctrl {
+	union {
+		__u32           all;
+		struct {
+			__u8    request;
+			__u8    granted;
+			__u16   __reserved;
+		};
+	};
+};
+
 /*
  * struct rseq is aligned on 4 * 8 bytes to ensure it is always
  * contained within a single cache-line.
@@ -173,10 +194,16 @@
 	__u32 mm_cid;
 
 	/*
+	 * Time slice extension control structure. CPU local updates from
+	 * kernel and user space.
+	 */
+	struct rseq_abi_slice_ctrl slice_ctrl;
+
+	/*
 	 * Flexible array member at end of structure, after last feature field.
 	 */
 	char end[];
-} __attribute__((aligned(4 * sizeof(__u64))));
+} __attribute__((aligned(32)));
 
 /*
  * Define the rseq system call number if not yet available in

diff --git a/include/rseq/rseq.h b/include/rseq/rseq.h
index 4e11ada..0c34f87 100644
--- a/include/rseq/rseq.h
+++ b/include/rseq/rseq.h

@@ -231,6 +231,15 @@
 }
 
 /*
+ * Returns true if the 'slice_ctrl' feature is available.
+ */
+static inline __attribute__((always_inline))
+bool rseq_slice_ctrl_available(void)
+{
+	return (int) rseq_size >= (int) rseq_offsetofend(struct rseq_abi, slice_ctrl);
+}
+
+/*
  * Clear the rseq_cs pointer.
  */
 static inline __attribute__((always_inline))