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Subject[tip: sched/core] sched, vmlinux.lds: Increase STRUCT_ALIGNMENT to 64 bytes for GCC-4.9
The following commit has been merged into the sched/core branch of tip:

Commit-ID: 85c2ce9104eb93517db2037699471c517e81f9b4
Gitweb: https://git.kernel.org/tip/85c2ce9104eb93517db2037699471c517e81f9b4
Author: Peter Zijlstra <peterz@infradead.org>
AuthorDate: Tue, 30 Jun 2020 16:49:05 +02:00
Committer: Peter Zijlstra <peterz@infradead.org>
CommitterDate: Wed, 08 Jul 2020 11:39:00 +02:00

sched, vmlinux.lds: Increase STRUCT_ALIGNMENT to 64 bytes for GCC-4.9

For some mysterious reason GCC-4.9 has a 64 byte section alignment for
structures, all other GCC versions (and Clang) tested (including 4.8
and 5.0) are fine with the 32 bytes alignment.

Getting this right is important for the new SCHED_DATA macro that
creates an explicitly ordered array of 'struct sched_class' in the
linker script and expect pointer arithmetic to work.

Fixes: c3a340f7e7ea ("sched: Have sched_class_highest define by vmlinux.lds.h")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200630144905.GX4817@hirez.programming.kicks-ass.net
---
include/asm-generic/vmlinux.lds.h | 18 +++++++++++-------
kernel/sched/sched.h | 3 ++-
2 files changed, 13 insertions(+), 8 deletions(-)

diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index 66fb84c..3ceb4b7 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -109,6 +109,17 @@
#endif

/*
+ * GCC 4.5 and later have a 32 bytes section alignment for structures.
+ * Except GCC 4.9, that feels the need to align on 64 bytes.
+ */
+#if __GNUC__ == 4 && __GNUC_MINOR__ == 9
+#define STRUCT_ALIGNMENT 64
+#else
+#define STRUCT_ALIGNMENT 32
+#endif
+#define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
+
+/*
* The order of the sched class addresses are important, as they are
* used to determine the order of the priority of each sched class in
* relation to each other.
@@ -123,13 +134,6 @@
*(__stop_sched_class) \
__end_sched_classes = .;

-/*
- * Align to a 32 byte boundary equal to the
- * alignment gcc 4.5 uses for a struct
- */
-#define STRUCT_ALIGNMENT 32
-#define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
-
/* The actual configuration determine if the init/exit sections
* are handled as text/data or they can be discarded (which
* often happens at runtime)
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 5aa6661..9bef2dd 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -67,6 +67,7 @@
#include <linux/tsacct_kern.h>

#include <asm/tlb.h>
+#include <asm-generic/vmlinux.lds.h>

#ifdef CONFIG_PARAVIRT
# include <asm/paravirt.h>
@@ -1810,7 +1811,7 @@ struct sched_class {
#ifdef CONFIG_FAIR_GROUP_SCHED
void (*task_change_group)(struct task_struct *p, int type);
#endif
-} __aligned(32); /* STRUCT_ALIGN(), vmlinux.lds.h */
+} __aligned(STRUCT_ALIGNMENT); /* STRUCT_ALIGN(), vmlinux.lds.h */

static inline void put_prev_task(struct rq *rq, struct task_struct *prev)
{
\
 
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