[glibc] libio: Assume _IO_lock_inexpensive

[glibc] libio: Assume _IO_lock_inexpensive

[Adhemerval Zanella]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=57094e576aed174317fb7de2da34be8536891678

commit 57094e576aed174317fb7de2da34be8536891678
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Mon May 10 18:05:49 2021 -0300

    libio: Assume _IO_lock_inexpensive
    
    It is already set by both Linux and Hurd.

Diff:
---
 libio/libio.h             | 11 ++---------
 sysdeps/mach/libc-lock.h  |  3 ---
 sysdeps/nptl/stdio-lock.h |  3 ---
 3 files changed, 2 insertions(+), 15 deletions(-)

diff --git a/libio/libio.h b/libio/libio.h
index 98d526dec7..cebdc65763 100644
--- a/libio/libio.h
+++ b/libio/libio.h
@@ -280,17 +280,10 @@ libc_hidden_proto (_IO_sgetn)
 # undef _IO_ftrylockfile
 
 # define _IO_peekc(_fp) _IO_peekc_locked (_fp)
-# if _IO_lock_inexpensive
-#  define _IO_flockfile(_fp) \
+# define _IO_flockfile(_fp) \
   if (((_fp)->_flags & _IO_USER_LOCK) == 0) _IO_lock_lock (*(_fp)->_lock)
-#  define _IO_funlockfile(_fp) \
+# define _IO_funlockfile(_fp) \
   if (((_fp)->_flags & _IO_USER_LOCK) == 0) _IO_lock_unlock (*(_fp)->_lock)
-# else
-#  define _IO_flockfile(_fp) \
-  if (((_fp)->_flags & _IO_USER_LOCK) == 0) _IO_flockfile (_fp)
-#  define _IO_funlockfile(_fp) \
-  if (((_fp)->_flags & _IO_USER_LOCK) == 0) _IO_funlockfile (_fp)
-# endif
 #endif /* _IO_MTSAFE_IO */
 
 #endif /* _LIBIO_H */
diff --git a/sysdeps/mach/libc-lock.h b/sysdeps/mach/libc-lock.h
index d713f34b5f..220fcee921 100644
--- a/sysdeps/mach/libc-lock.h
+++ b/sysdeps/mach/libc-lock.h
@@ -24,9 +24,6 @@
 #include <tls.h>
 #include <lowlevellock.h>
 
-/* The locking here is very inexpensive, even for inlining.  */
-#define _IO_lock_inexpensive   1
-
 typedef unsigned int __libc_lock_t;
 typedef struct
 {
diff --git a/sysdeps/nptl/stdio-lock.h b/sysdeps/nptl/stdio-lock.h
index f2eee49816..a4f419b516 100644
--- a/sysdeps/nptl/stdio-lock.h
+++ b/sysdeps/nptl/stdio-lock.h
@@ -23,9 +23,6 @@
 #include <lowlevellock.h>
 
 
-/* The locking here is very inexpensive, even for inlining.  */
-#define _IO_lock_inexpensive	1
-
 typedef struct { int lock; int cnt; void *owner; } _IO_lock_t;
 #define _IO_lock_t_defined 1