svn commit: r205499 - projects/ppc64/sys/powerpc/powerpc

[Nathan Whitehorn]

Author: nwhitehorn
Date: Tue Mar 23 01:26:17 2010
New Revision: 205499
URL: http://svn.freebsd.org/changeset/base/205499

Log:
  Provide a useful comment.

Modified:
  projects/ppc64/sys/powerpc/powerpc/exec_machdep.c

Modified: projects/ppc64/sys/powerpc/powerpc/exec_machdep.c
==============================================================================
--- projects/ppc64/sys/powerpc/powerpc/exec_machdep.c	Tue Mar 23 01:24:23 2010	(r205498)
+++ projects/ppc64/sys/powerpc/powerpc/exec_machdep.c	Tue Mar 23 01:26:17 2010	(r205499)
@@ -890,7 +890,7 @@ cpu_set_syscall_retval(struct thread *td
 			tf->fixreg[FIRSTARG] = td->td_retval[0];
 			tf->fixreg[FIRSTARG + 1] = td->td_retval[1];
 		}
-		tf->cr &= ~0x10000000;		/* XXX: Magic number */
+		tf->cr &= ~0x10000000;		/* Unset summary overflow */
 		break;
 	case ERESTART:
 		/*
@@ -904,7 +904,7 @@ cpu_set_syscall_retval(struct thread *td
 			    p->p_sysent->sv_errtbl[error] : -1;
 		}
 		tf->fixreg[FIRSTARG] = error;
-		tf->cr |= 0x10000000;		/* XXX: Magic number */
+		tf->cr |= 0x10000000;		/* Set summary overflow */
 		break;
 	}
 }