From d20db0561a6a36f914fde030512503b114ef9a0c Mon Sep 17 00:00:00 2001
From: CoprDistGit <infra@openeuler.org>
Date: Sat, 3 Aug 2024 06:28:41 +0000
Subject: automatic import of glibc

---
 ...Linux-Use-rseq-to-accelerate-sched_getcpu.patch | 48 ++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 rseq-Linux-Use-rseq-to-accelerate-sched_getcpu.patch

(limited to 'rseq-Linux-Use-rseq-to-accelerate-sched_getcpu.patch')

diff --git a/rseq-Linux-Use-rseq-to-accelerate-sched_getcpu.patch b/rseq-Linux-Use-rseq-to-accelerate-sched_getcpu.patch
new file mode 100644
index 0000000..3e7548c
--- /dev/null
+++ b/rseq-Linux-Use-rseq-to-accelerate-sched_getcpu.patch
@@ -0,0 +1,48 @@
+From 00bae0eb5212a1ec4e8b4b90294937903628e7ce Mon Sep 17 00:00:00 2001
+From: Florian Weimer <fweimer@redhat.com>
+Date: Thu, 9 Dec 2021 09:49:32 +0100
+Subject: [PATCH 5/9] Linux: Use rseq to accelerate sched_getcpu
+
+Co-Authored-By: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
+---
+ sysdeps/unix/sysv/linux/sched_getcpu.c | 19 +++++++++++++++++--
+ 1 file changed, 17 insertions(+), 2 deletions(-)
+
+diff --git a/sysdeps/unix/sysv/linux/sched_getcpu.c b/sysdeps/unix/sysv/linux/sched_getcpu.c
+index c41e986f..6f78edae 100644
+--- a/sysdeps/unix/sysv/linux/sched_getcpu.c
++++ b/sysdeps/unix/sysv/linux/sched_getcpu.c
+@@ -20,8 +20,8 @@
+ #include <sysdep.h>
+ #include <sysdep-vdso.h>
+ 
+-int
+-sched_getcpu (void)
++static int
++vsyscall_sched_getcpu (void)
+ {
+   unsigned int cpu;
+   int r = -1;
+@@ -32,3 +32,18 @@ sched_getcpu (void)
+ #endif
+   return r == -1 ? r : cpu;
+ }
++
++#ifdef RSEQ_SIG
++int
++sched_getcpu (void)
++{
++  int cpu_id = THREAD_GETMEM_VOLATILE (THREAD_SELF, rseq_area.cpu_id);
++  return __glibc_likely (cpu_id >= 0) ? cpu_id : vsyscall_sched_getcpu ();
++}
++#else /* RSEQ_SIG */
++int
++sched_getcpu (void)
++{
++  return vsyscall_sched_getcpu ();
++}
++#endif /* RSEQ_SIG */
+-- 
+2.23.0
+
-- 
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