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 --git a/NEWS b/NEWS
index f8fb8db51085376e8c3f9a5fbe37cbfcd1729b05..becab3ade949aa17618f59491f17ecfcef9e591f 100644 (file)
--- 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 b8088cf13f938c88b263f83efa1941e3c59a1a8a..0b851b6c8664e8d5dfcde26de9b8ef3b72bcfd1a 100644 (file)
--- 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;
 }