[glibc/arm/morello/main] alpha: Fix generic brk system call emulation in __brk_call (bug 29490)

[glibc/arm/morello/main] alpha: Fix generic brk system call emulation in __brk_call (bug 29490)

[Szabolcs Nagy]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=8b139cd4f1074ae0d95d9bff60db283a1ed72734

commit 8b139cd4f1074ae0d95d9bff60db283a1ed72734
Author: Florian Weimer <fweimer@redhat.com>
Date:   Mon Aug 22 11:04:47 2022 +0200

    alpha: Fix generic brk system call emulation in __brk_call (bug 29490)
    
    The kernel special-cases the zero argument for alpha brk, and we can
    use that to restore the generic Linux error handling behavior.
    
    Fixes commit b57ab258c1140bc45464b4b9908713e3e0ee35aa ("Linux:
    Introduce __brk_call for invoking the brk system call").
    
    (cherry picked from commit e7ad26ee3cb74e61d0637c888f24dd478d77af58)

Diff:
---
 NEWS                                     | 1 +
 sysdeps/unix/sysv/linux/alpha/brk_call.h | 7 +++----
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/NEWS b/NEWS
index f8fb8db510..becab3ade9 100644
--- a/NEWS
+++ b/NEWS
@@ -11,6 +11,7 @@ The following bugs are resolved with this release:
 
   [29446] _dlopen now ignores dl_caller argument in static mode
   [29485] Linux: Terminate subprocess on late failure in tst-pidfd
+  [29490] alpha: New __brk_call implementation is broken
 
 \f
 Version 2.36
diff --git a/sysdeps/unix/sysv/linux/alpha/brk_call.h b/sysdeps/unix/sysv/linux/alpha/brk_call.h
index b8088cf13f..0b851b6c86 100644
--- a/sysdeps/unix/sysv/linux/alpha/brk_call.h
+++ b/sysdeps/unix/sysv/linux/alpha/brk_call.h
@@ -21,8 +21,7 @@ __brk_call (void *addr)
 {
   unsigned long int result = INTERNAL_SYSCALL_CALL (brk, addr);
   if (result == -ENOMEM)
-    /* Mimic the default error reporting behavior.  */
-    return addr;
-  else
-    return (void *) result;
+    /* Mimic the generic error reporting behavior.  */
+    result = INTERNAL_SYSCALL_CALL (brk, 0);
+  return (void *) result;
 }