[PATCH v4 2/3] aarch64: avoid populating __ifunc_arg_t struct multiple times

[Yury Khrustalev]

Set fields of the __ifunc_arg_t struct in elf_ifunc_invoke()
only once to avoid repeating this for each ifunc resolver.
---
 sysdeps/aarch64/dl-irel.h | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/sysdeps/aarch64/dl-irel.h b/sysdeps/aarch64/dl-irel.h
index 9abf7a60a1..0f1ad5f2d6 100644
--- a/sysdeps/aarch64/dl-irel.h
+++ b/sysdeps/aarch64/dl-irel.h
@@ -44,13 +44,15 @@ static inline ElfW(Addr)
 __attribute ((always_inline))
 elf_ifunc_invoke (ElfW(Addr) addr)
 {
-  __ifunc_arg_t arg;
-
-  arg._size = sizeof (arg);
-  arg._hwcap = GLRO(dl_hwcap);
-  arg._hwcap2 = GLRO(dl_hwcap2);
-  arg._hwcap3 = GLRO(dl_hwcap3);
-  arg._hwcap4 = GLRO(dl_hwcap4);
+  static __ifunc_arg_t arg;
+  if (arg._size == 0)
+    {
+      arg._size = sizeof (arg);
+      arg._hwcap = GLRO(dl_hwcap);
+      arg._hwcap2 = GLRO(dl_hwcap2);
+      arg._hwcap3 = GLRO(dl_hwcap3);
+      arg._hwcap4 = GLRO(dl_hwcap4);
+    }
   return ((ElfW(Addr) (*) (uint64_t, const __ifunc_arg_t *)) (addr))
 	 (GLRO(dl_hwcap) | _IFUNC_ARG_HWCAP, &arg);
 }
-- 
2.39.5