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").

1 files changed, 3 insertions, 4 deletions

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;
 }