[src/trunk]: src/sys/dev/dmover kill alloca in favor of ssp

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/d35be998fc44
branches:  trunk
changeset: 820363:d35be998fc44
user:      christos <christos%NetBSD.org@localhost>
date:      Sat Jan 07 21:11:14 2017 +0000

description:
kill alloca in favor of ssp

diffstat:

 sys/dev/dmover/swdmover.c |  40 +++++++++++++++++-----------------------
 1 files changed, 17 insertions(+), 23 deletions(-)

diffs (124 lines):

diff -r d4bd02544aab -r d35be998fc44 sys/dev/dmover/swdmover.c
--- a/sys/dev/dmover/swdmover.c Sat Jan 07 20:49:23 2017 +0000
+++ b/sys/dev/dmover/swdmover.c Sat Jan 07 21:11:14 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: swdmover.c,v 1.13 2015/08/20 14:40:17 christos Exp $   */
+/*     $NetBSD: swdmover.c,v 1.14 2017/01/07 21:11:14 christos Exp $   */
 
 /*
  * Copyright (c) 2002, 2003 Wasabi Systems, Inc.
@@ -49,7 +49,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: swdmover.c,v 1.13 2015/08/20 14:40:17 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD: swdmover.c,v 1.14 2017/01/07 21:11:14 christos Exp $");
 
 #include <sys/param.h>
 #include <sys/kthread.h>
@@ -147,7 +147,7 @@
        case DMOVER_BUF_UIO:
            {
                struct uio *uio = dreq->dreq_outbuf.dmbuf_uio;
-               char *cp;
+               char cp[1024];
                size_t count, buflen;
                int error;
 
@@ -160,9 +160,8 @@
                }
 
                buflen = uio->uio_resid;
-               if (buflen > 1024)
-                       buflen = 1024;
-               cp = alloca(buflen);
+               if (buflen > sizeof(cp))
+                       buflen = sizeof(cp);
                memset(cp, 0, buflen);
 
                while ((count = uio->uio_resid) != 0) {
@@ -209,7 +208,7 @@
        case DMOVER_BUF_UIO:
            {
                struct uio *uio = dreq->dreq_outbuf.dmbuf_uio;
-               char *cp;
+               char cp[1024];
                size_t count, buflen;
                int error;
 
@@ -222,9 +221,8 @@
                }
 
                buflen = uio->uio_resid;
-               if (buflen > 1024)
-                       buflen = 1024;
-               cp = alloca(buflen);
+               if (buflen > sizeof(cp))
+                       buflen = sizeof(cp);
                memset(cp, dreq->dreq_immediate[0], buflen);
 
                while ((count = uio->uio_resid) != 0) {
@@ -334,7 +332,7 @@
                struct uio *uio_out = dreq->dreq_outbuf.dmbuf_uio;
                struct uio *uio_in = dreq->dreq_inbuf[0].dmbuf_uio;
                struct uio *uio;
-               char *cp, *dst;
+               char cp[1024], dst[1024];
                size_t count, buflen;
                int error;
 
@@ -349,10 +347,8 @@
                }
 
                buflen = uio_in->uio_resid;
-               if (buflen > 1024)
-                       buflen = 1024;
-               cp = alloca(buflen);
-               dst = alloca(buflen);
+               if (buflen > sizeof(cp))
+                       buflen = sizeof(cp);
 
                /*
                 * For each block, copy first input buffer into the destination
@@ -440,7 +436,7 @@
            {
                struct uio *uio_out = dreq->dreq_outbuf.dmbuf_uio;
                struct uio *uio_in = dreq->dreq_inbuf[0].dmbuf_uio;
-               char *cp;
+               char cp[1024];
                size_t count, buflen;
                int error;
 
@@ -455,9 +451,8 @@
                }
 
                buflen = uio_in->uio_resid;
-               if (buflen > 1024)
-                       buflen = 1024;
-               cp = alloca(buflen);
+               if (buflen > sizeof(cp))
+                       buflen = sizeof(cp);
 
                while ((count = uio_in->uio_resid) != 0) {
                        if (count > buflen)
@@ -595,7 +590,7 @@
        case DMOVER_BUF_UIO:
            {
                struct uio *uio_in = dreq->dreq_inbuf[0].dmbuf_uio;
-               uint8_t *cp;
+               uint8_t cp[1024];
                size_t count, buflen;
                int error;
 
@@ -608,9 +603,8 @@
                }
 
                buflen = uio_in->uio_resid;
-               if (buflen > 1024)
-                       buflen = 1024;
-               cp = alloca(buflen);
+               if (buflen > sizeof(cp))
+                       buflen = sizeof(cp);
 
                while ((count = uio_in->uio_resid) != 0) {
                        if (count > buflen)