1 files changed, 34 insertions, 12 deletions

diff --git a/kernel/debug/kdb/kdb_io.c b/kernel/debug/kdb/kdb_io.c
index 7c70812caea5..fc1ef736253c 100644
--- a/kernel/debug/kdb/kdb_io.c
+++ b/kernel/debug/kdb/kdb_io.c
@@ -439,7 +439,7 @@ poll_again:
  *      substituted for %d, %x or %o in the prompt.
  */
 
-char *kdb_getstr(char *buffer, size_t bufsize, char *prompt)
+char *kdb_getstr(char *buffer, size_t bufsize, const char *prompt)
 {
         if (prompt && kdb_prompt_str != prompt)
                 strncpy(kdb_prompt_str, prompt, CMD_BUFLEN);
@@ -548,7 +548,7 @@ static int kdb_search_string(char *searched, char *searchfor)
         return 0;
 }
 
-int vkdb_printf(const char *fmt, va_list ap)
+int vkdb_printf(enum kdb_msgsrc src, const char *fmt, va_list ap)
 {
         int diag;
         int linecount;
@@ -680,6 +680,12 @@ int vkdb_printf(const char *fmt, va_list ap)
                         size_avail = sizeof(kdb_buffer) - len;
                         goto kdb_print_out;
                 }
+                if (kdb_grepping_flag >= KDB_GREPPING_FLAG_SEARCH)
+                        /*
+                         * This was a interactive search (using '/' at more
+                         * prompt) and it has completed. Clear the flag.
+                         */
+                        kdb_grepping_flag = 0;
                 /*
                  * at this point the string is a full line and
                  * should be printed, up to the null.
@@ -691,19 +697,20 @@ kdb_printit:
          * Write to all consoles.
          */
         retlen = strlen(kdb_buffer);
+        cp = (char *) printk_skip_level(kdb_buffer);
         if (!dbg_kdb_mode && kgdb_connected) {
-                gdbstub_msg_write(kdb_buffer, retlen);
+                gdbstub_msg_write(cp, retlen - (cp - kdb_buffer));
         } else {
                 if (dbg_io_ops && !dbg_io_ops->is_console) {
-                        len = retlen;
-                        cp = kdb_buffer;
+                        len = retlen - (cp - kdb_buffer);
+                        cp2 = cp;
                         while (len--) {
-                                dbg_io_ops->write_char(*cp);
-                                cp++;
+                                dbg_io_ops->write_char(*cp2);
+                                cp2++;
                         }
                 }
                 while (c) {
-                        c->write(c, kdb_buffer, retlen);
+                        c->write(c, cp, retlen - (cp - kdb_buffer));
                         touch_nmi_watchdog();
                         c = c->next;
                 }
@@ -711,7 +718,10 @@ kdb_printit:
         if (logging) {
                 saved_loglevel = console_loglevel;
                 console_loglevel = CONSOLE_LOGLEVEL_SILENT;
-                printk(KERN_INFO "%s", kdb_buffer);
+                if (printk_get_level(kdb_buffer) || src == KDB_MSGSRC_PRINTK)
+                        printk("%s", kdb_buffer);
+                else
+                        pr_info("%s", kdb_buffer);
         }
 
         if (KDB_STATE(PAGER)) {
@@ -794,11 +804,23 @@ kdb_printit:
                         kdb_nextline = linecount - 1;
                         kdb_printf("\r");
                         suspend_grep = 1; /* for this recursion */
+                } else if (buf1[0] == '/' && !kdb_grepping_flag) {
+                        kdb_printf("\r");
+                        kdb_getstr(kdb_grep_string, KDB_GREP_STRLEN,
+                                   kdbgetenv("SEARCHPROMPT") ?: "search> ");
+                        *strchrnul(kdb_grep_string, '\n') = '\0';
+                        kdb_grepping_flag += KDB_GREPPING_FLAG_SEARCH;
+                        suspend_grep = 1; /* for this recursion */
                 } else if (buf1[0] && buf1[0] != '\n') {
                         /* user hit something other than enter */
                         suspend_grep = 1; /* for this recursion */
-                        kdb_printf("\nOnly 'q' or 'Q' are processed at more "
-                                   "prompt, input ignored\n");
+                        if (buf1[0] != '/')
+                                kdb_printf(
+                                    "\nOnly 'q', 'Q' or '/' are processed at "
+                                    "more prompt, input ignored\n");
+                        else
+                                kdb_printf("\n'/' cannot be used during | "
+                                           "grep filtering, input ignored\n");
                 } else if (kdb_grepping_flag) {
                         /* user hit enter */
                         suspend_grep = 1; /* for this recursion */
@@ -844,7 +866,7 @@ int kdb_printf(const char *fmt, ...)
         int r;
 
         va_start(ap, fmt);
-        r = vkdb_printf(fmt, ap);
+        r = vkdb_printf(KDB_MSGSRC_INTERNAL, fmt, ap);
         va_end(ap);
 
         return r;