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1471d85ffb
This LWN article explains the why scnprintf is preferred over snprintf in general https://lwn.net/Articles/69419/ Ie. snprintf() returns what *would* be the resulting length, while scnprintf() returns the actual length. Note that ctcm_print_statistics() writes the data into the kernel log and is therefore not suitable for sysfs_emit(). Observable behavior is not changed, as there may be dependencies. Reviewed-by: Alexandra Winter <wintera@linux.ibm.com> Signed-off-by: Thorsten Winkler <twinkler@linux.ibm.com> Signed-off-by: Alexandra Winter <wintera@linux.ibm.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
79 lines
1.9 KiB
C
79 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright IBM Corp. 2001, 2007
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* Authors: Peter Tiedemann (ptiedem@de.ibm.com)
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*
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*/
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#include <linux/stddef.h>
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/ctype.h>
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#include <linux/sysctl.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <linux/debugfs.h>
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#include "ctcm_dbug.h"
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/*
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* Debug Facility Stuff
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*/
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struct ctcm_dbf_info ctcm_dbf[CTCM_DBF_INFOS] = {
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[CTCM_DBF_SETUP] = {"ctc_setup", 8, 1, 64, CTC_DBF_INFO, NULL},
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[CTCM_DBF_ERROR] = {"ctc_error", 8, 1, 64, CTC_DBF_ERROR, NULL},
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[CTCM_DBF_TRACE] = {"ctc_trace", 8, 1, 64, CTC_DBF_ERROR, NULL},
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[CTCM_DBF_MPC_SETUP] = {"mpc_setup", 8, 1, 80, CTC_DBF_INFO, NULL},
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[CTCM_DBF_MPC_ERROR] = {"mpc_error", 8, 1, 80, CTC_DBF_ERROR, NULL},
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[CTCM_DBF_MPC_TRACE] = {"mpc_trace", 8, 1, 80, CTC_DBF_ERROR, NULL},
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};
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void ctcm_unregister_dbf_views(void)
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{
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int x;
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for (x = 0; x < CTCM_DBF_INFOS; x++) {
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debug_unregister(ctcm_dbf[x].id);
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ctcm_dbf[x].id = NULL;
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}
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}
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int ctcm_register_dbf_views(void)
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{
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int x;
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for (x = 0; x < CTCM_DBF_INFOS; x++) {
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/* register the areas */
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ctcm_dbf[x].id = debug_register(ctcm_dbf[x].name,
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ctcm_dbf[x].pages,
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ctcm_dbf[x].areas,
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ctcm_dbf[x].len);
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if (ctcm_dbf[x].id == NULL) {
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ctcm_unregister_dbf_views();
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return -ENOMEM;
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}
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/* register a view */
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debug_register_view(ctcm_dbf[x].id, &debug_hex_ascii_view);
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/* set a passing level */
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debug_set_level(ctcm_dbf[x].id, ctcm_dbf[x].level);
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}
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return 0;
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}
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void ctcm_dbf_longtext(enum ctcm_dbf_names dbf_nix, int level, char *fmt, ...)
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{
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char dbf_txt_buf[64];
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va_list args;
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if (!debug_level_enabled(ctcm_dbf[dbf_nix].id, level))
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return;
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va_start(args, fmt);
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vscnprintf(dbf_txt_buf, sizeof(dbf_txt_buf), fmt, args);
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va_end(args);
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debug_text_event(ctcm_dbf[dbf_nix].id, level, dbf_txt_buf);
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}
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