[glibc] malloc: Use __get_nprocs on arena_get2 (BZ 30945)

[glibc] malloc: Use __get_nprocs on arena_get2 (BZ 30945)

[Adhemerval Zanella]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=472894d2cfee5751b44c0aaa71ed87df81c8e62e

commit 472894d2cfee5751b44c0aaa71ed87df81c8e62e
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Wed Oct 11 13:43:56 2023 -0300

    malloc: Use __get_nprocs on arena_get2 (BZ 30945)
    
    This restore the 2.33 semantic for arena_get2.  It was changed by
    11a02b035b46 to avoid arena_get2 call malloc (back when __get_nproc
    was refactored to use an scratch_buffer - 903bc7dcc2acafc).  The
    __get_nproc was refactored over then and now it also avoid to call
    malloc.
    
    The 11a02b035b46 did not take in consideration any performance
    implication, which should have been discussed properly.  The
    __get_nprocs_sched is still used as a fallback mechanism if procfs
    and sysfs is not acessible.
    
    Checked on x86_64-linux-gnu.
    Reviewed-by: DJ Delorie <dj@redhat.com>

Diff:
---
 include/sys/sysinfo.h                 | 4 ----
 malloc/arena.c                        | 2 +-
 misc/getsysstats.c                    | 6 ------
 sysdeps/mach/getsysstats.c            | 6 ------
 sysdeps/unix/sysv/linux/getsysstats.c | 2 +-
 5 files changed, 2 insertions(+), 18 deletions(-)

diff --git a/include/sys/sysinfo.h b/include/sys/sysinfo.h
index c490561581..65742b1036 100644
--- a/include/sys/sysinfo.h
+++ b/include/sys/sysinfo.h
@@ -14,10 +14,6 @@ libc_hidden_proto (__get_nprocs_conf)
 extern int __get_nprocs (void);
 libc_hidden_proto (__get_nprocs)
 
-/* Return the number of available processors which the process can
-   be scheduled.  */
-extern int __get_nprocs_sched (void) attribute_hidden;
-
 /* Return number of physical pages of memory in the system.  */
 extern long int __get_phys_pages (void);
 libc_hidden_proto (__get_phys_pages)
diff --git a/malloc/arena.c b/malloc/arena.c
index d1e214ac2e..a1a75e5a2b 100644
--- a/malloc/arena.c
+++ b/malloc/arena.c
@@ -824,7 +824,7 @@ arena_get2 (size_t size, mstate avoid_arena)
             narenas_limit = mp_.arena_max;
           else if (narenas > mp_.arena_test)
             {
-              int n = __get_nprocs_sched ();
+              int n = __get_nprocs ();
 
               if (n >= 1)
                 narenas_limit = NARENAS_FROM_NCORES (n);
diff --git a/misc/getsysstats.c b/misc/getsysstats.c
index 5f36adc0e8..23cc112074 100644
--- a/misc/getsysstats.c
+++ b/misc/getsysstats.c
@@ -44,12 +44,6 @@ weak_alias (__get_nprocs, get_nprocs)
 link_warning (get_nprocs, "warning: get_nprocs will always return 1")
 
 
-int
-__get_nprocs_sched (void)
-{
-  return 1;
-}
-
 long int
 __get_phys_pages (void)
 {
diff --git a/sysdeps/mach/getsysstats.c b/sysdeps/mach/getsysstats.c
index 5184e5eee1..d3834f3b69 100644
--- a/sysdeps/mach/getsysstats.c
+++ b/sysdeps/mach/getsysstats.c
@@ -62,12 +62,6 @@ __get_nprocs (void)
 libc_hidden_def (__get_nprocs)
 weak_alias (__get_nprocs, get_nprocs)
 
-int
-__get_nprocs_sched (void)
-{
-  return __get_nprocs ();
-}
-
 /* Return the number of physical pages on the system. */
 long int
 __get_phys_pages (void)
diff --git a/sysdeps/unix/sysv/linux/getsysstats.c b/sysdeps/unix/sysv/linux/getsysstats.c
index b0b6c154ac..1ea7f1f01f 100644
--- a/sysdeps/unix/sysv/linux/getsysstats.c
+++ b/sysdeps/unix/sysv/linux/getsysstats.c
@@ -29,7 +29,7 @@
 #include <sys/sysinfo.h>
 #include <sysdep.h>
 
-int
+static int
 __get_nprocs_sched (void)
 {
   enum