[src/trunk]: src/sys/miscfs/procfs struct statvfs is too large for stack. Use...

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

details:   https://anonhg.NetBSD.org/src/rev/73286d1b5c4b
branches:  trunk
changeset: 933901:73286d1b5c4b
user:      rin <rin%NetBSD.org@localhost>
date:      Sun May 31 08:38:54 2020 +0000

description:
struct statvfs is too large for stack. Use malloc(9) instead.

XXX
Switch to kmem(9) for entire this file.

Frame size, e.g. for m68k, becomes:
    3292 --> 12

diffstat:

 sys/miscfs/procfs/procfs_linux.c |  13 +++++++------
 1 files changed, 7 insertions(+), 6 deletions(-)

diffs (42 lines):

diff -r 03a55fbed190 -r 73286d1b5c4b sys/miscfs/procfs/procfs_linux.c
--- a/sys/miscfs/procfs/procfs_linux.c  Sun May 31 08:33:47 2020 +0000
+++ b/sys/miscfs/procfs/procfs_linux.c  Sun May 31 08:38:54 2020 +0000
@@ -1,4 +1,4 @@
-/*      $NetBSD: procfs_linux.c,v 1.83 2020/05/23 23:42:43 ad Exp $      */
+/*      $NetBSD: procfs_linux.c,v 1.84 2020/05/31 08:38:54 rin Exp $      */
 
 /*
  * Copyright (c) 2001 Wasabi Systems, Inc.
@@ -36,7 +36,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: procfs_linux.c,v 1.83 2020/05/23 23:42:43 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: procfs_linux.c,v 1.84 2020/05/31 08:38:54 rin Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -611,18 +611,19 @@
        struct mount *mp;
        int error = 0, root = 0;
        struct cwdinfo *cwdi = curl->l_proc->p_cwdi;
+       struct statvfs *sfs;
 
        bf = malloc(LBFSZ, M_TEMP, M_WAITOK);
 
+       sfs = malloc(sizeof(*sfs), M_TEMP, M_WAITOK);
        mountlist_iterator_init(&iter);
        while ((mp = mountlist_iterator_next(iter)) != NULL) {
-               struct statvfs sfs;
-
-               if ((error = dostatvfs(mp, &sfs, curl, MNT_WAIT, 0)) == 0)
+               if ((error = dostatvfs(mp, sfs, curl, MNT_WAIT, 0)) == 0)
                        root |= procfs_format_sfs(&mtab, &mtabsz, bf, LBFSZ,
-                           &sfs, curl, 0);
+                           sfs, curl, 0);
        }
        mountlist_iterator_destroy(iter);
+       free(sfs, M_TEMP);
 
        /*
         * If we are inside a chroot that is not itself a mount point,