Re: [RFC PATCH for 4.17 02/21] rseq: Introduce restartable sequences system call (v12)
From: Peter Zijlstra <peterz@infradead.org>
Date: 2018-03-28 11:22:48
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On Tue, Mar 27, 2018 at 12:05:23PM -0400, Mathieu Desnoyers wrote:
+/*
+ * struct rseq_cs is aligned on 4 * 8 bytes to ensure it is always
+ * contained within a single cache-line. It is usually declared as
+ * link-time constant data.
+ */
+struct rseq_cs {
+ /* Version of this structure. */
+ uint32_t version;
+ /* enum rseq_cs_flags */
+ uint32_t flags;
+ LINUX_FIELD_u32_u64(start_ip);
+ /* Offset from start_ip. */
+ LINUX_FIELD_u32_u64(post_commit_offset);
+ LINUX_FIELD_u32_u64(abort_ip);
+} __attribute__((aligned(4 * sizeof(uint64_t))));What's with the uint32_t ? The normal Linux API type is __u32 afaik.