linux-kernel - Re: [PATCH] rtla: Define _GNU_SOURCE in timerlat

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Message-ID: <CAP4=nvThhq_0vF_xGCEnT6oNhpt_JHoEuOPmy3uT7jR_0r-YbQ@mail.gmail.com>
Date: Mon, 19 May 2025 08:20:50 +0200
From: Tomas Glozar <tglozar@...hat.com>
To: John Kacur <jkacur@...hat.com>
Cc: Steven Rostedt <rostedt@...dmis.org>, linux-trace-kernel@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Luis Goncalves <lgoncalv@...hat.com>
Subject: Re: [PATCH] rtla: Define _GNU_SOURCE in timerlat_bpf.c

so 17. 5. 2025 v 0:22 odesílatel John Kacur <jkacur@...hat.com> napsal:
> Question for Tomas, should we spend sometime to make this work for older
> versions of glibc without a definition of struct sched_attr?

Older versions of glibc without a definition for struct sched_attr use
the one in utils.h:

#ifndef SCHED_ATTR_SIZE_VER0
struct sched_attr {
    uint32_t size;
    uint32_t sched_policy;
    uint64_t sched_flags;
    int32_t sched_nice;
    uint32_t sched_priority;
    uint64_t sched_runtime;
    uint64_t sched_deadline;
    uint64_t sched_period;
};
#endif /* SCHED_ATTR_SIZE_VER0 */

In fact, this one works fine in timerlat_bpf.c, if you build rtla on
older glibc, it will work even without this patch. It's the glibc one
which is not defined without _GNU_SOURCE.

Tomas