diff options
Diffstat (limited to 'drivers/staging/unisys/visorutil/visorkmodutils.c')
-rw-r--r-- | drivers/staging/unisys/visorutil/visorkmodutils.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/drivers/staging/unisys/visorutil/visorkmodutils.c b/drivers/staging/unisys/visorutil/visorkmodutils.c new file mode 100644 index 000000000000..a7d1e94ca3c3 --- /dev/null +++ b/drivers/staging/unisys/visorutil/visorkmodutils.c @@ -0,0 +1,71 @@ +/* timskmodutils.c + * + * Copyright © 2010 - 2013 UNISYS CORPORATION + * All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or (at + * your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for more + * details. + */ + +#include "uniklog.h" +#include "timskmod.h" + +#define MYDRVNAME "timskmodutils" + +/** Callers to interfaces that set __GFP_NORETRY flag below + * must check for a NULL (error) result as we are telling the + * kernel interface that it is okay to fail. + */ + +void *kmalloc_kernel(size_t siz) +{ + return kmalloc(siz, GFP_KERNEL | __GFP_NORETRY); +} + +/* Use these handy-dandy seq_file_xxx functions if you want to call some + * functions that write stuff into a seq_file, but you actually just want + * to dump that output into a buffer. Use them as follows: + * - call visor_seq_file_new_buffer to create the seq_file (you supply the buf) + * - call whatever functions you want that take a seq_file as an argument + * (the buf you supplied will get the output data) + * - call visor_seq_file_done_buffer to dispose of your seq_file + */ +struct seq_file *visor_seq_file_new_buffer(void *buf, size_t buf_size) +{ + struct seq_file *rc = NULL; + struct seq_file *m = kmalloc_kernel(sizeof(struct seq_file)); + + if (m == NULL) { + rc = NULL; + goto Away; + } + memset(m, 0, sizeof(struct seq_file)); + m->buf = buf; + m->size = buf_size; + rc = m; +Away: + if (rc == NULL) { + visor_seq_file_done_buffer(m); + m = NULL; + } + return rc; +} +EXPORT_SYMBOL_GPL(visor_seq_file_new_buffer); + + + +void visor_seq_file_done_buffer(struct seq_file *m) +{ + if (!m) + return; + kfree(m); +} +EXPORT_SYMBOL_GPL(visor_seq_file_done_buffer); |