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Newer versions of glibc include a definition of struct sched_attr in bits/sched.h (included through sched.h which is included by rtla). Commit0eecee3406("tools/rtla: fix collision with glibc sched_attr/sched_set_attr") has modified the definition of struct sched_attr in utils.h, so that it is only applied with older versions of glibc that do not define it, in order to prevent build failure. The definition in bits/sched.h depends on _GNU_SOURCE. timerlat_bpf.c does not define _GNU_SOURCE, making it fall back to the definition in utils.h. The latter has two fields less, leading to shifted offsets of struct timerlat_params in timerlat_bpf_init. Because of the shift, timerlat_bpf_init incorrectly reads params->entries as 0 for timerlat-hist and disables the creation of histogram maps, causing breakage in BPF sample collection mode: $ rtla timerlat hist -d 1s Error pulling BPF data Fix the issue by also defining _GNU_SOURCE in timerlat_bpf.c. Cc: John Kacur <jkacur@redhat.com> Cc: Luis Goncalves <lgoncalv@redhat.com> Link: https://lore.kernel.org/20250430144651.621766-1-tglozar@redhat.com Fixes:e34293ddce("rtla/timerlat: Add BPF skeleton to collect samples") Signed-off-by: Tomas Glozar <tglozar@redhat.com> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.