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Date:   Thu, 21 May 2020 11:53:46 -0400
From:   "Joel Fernandes (Google)" <>
Cc:     "Joel Fernandes (Google)" <>,,,,,,,,,
Subject: [PATCH RFC] sched/headers: Fix sched_setattr userspace compilation issues

On a modern Linux distro, compiling the following program fails:

 void main() {
         struct sched_attr sa;


/usr/include/linux/sched/types.h:8:8: \
			error: redefinition of ‘struct sched_param’
    8 | struct sched_param {
      |        ^~~~~~~~~~~
In file included from /usr/include/x86_64-linux-gnu/bits/sched.h:74,
                 from /usr/include/sched.h:43,
                 from /usr/include/pthread.h:23,
                 from /tmp/s.c:4:
note: originally defined here
   23 | struct sched_param
      |        ^~~~~~~~~~~

This is also causing a problem on using sched_attr Chrome. The issue is
sched_param is already provided by glibc.

Guard the kernel's UAPI definition of sched_param with __KERNEL__ so
that userspace can compile.

Signed-off-by: Joel Fernandes (Google) <>
 include/uapi/linux/sched/types.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/uapi/linux/sched/types.h b/include/uapi/linux/sched/types.h
index c852153ddb0d3..1f10d935a63fe 100644
--- a/include/uapi/linux/sched/types.h
+++ b/include/uapi/linux/sched/types.h
@@ -4,9 +4,11 @@
 #include <linux/types.h>
+#if defined(__KERNEL__)
 struct sched_param {
 	int sched_priority;
 #define SCHED_ATTR_SIZE_VER0	48	/* sizeof first published struct */
 #define SCHED_ATTR_SIZE_VER1	56	/* add: util_{min,max} */

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