1 files changed, 17 insertions, 1 deletions

diff --git a/scripts/kallsyms.c b/scripts/kallsyms.c
index 487ac6f37ca2..10085de886fe 100644
--- a/scripts/kallsyms.c
+++ b/scripts/kallsyms.c
@@ -55,6 +55,7 @@ static struct sym_entry *table;
 static unsigned int table_size, table_cnt;
 static int all_symbols = 0;
 static char symbol_prefix_char = '\0';
+static unsigned long long kernel_start_addr = 0;
 
 int token_profit[0x10000];
 
@@ -65,7 +66,10 @@ unsigned char best_table_len[256];
 
 static void usage(void)
 {
-        fprintf(stderr, "Usage: kallsyms [--all-symbols] [--symbol-prefix=<prefix char>] < in.map > out.S\n");
+        fprintf(stderr, "Usage: kallsyms [--all-symbols] "
+                        "[--symbol-prefix=<prefix char>] "
+                        "[--page-offset=<CONFIG_PAGE_OFFSET>] "
+                        "< in.map > out.S\n");
         exit(1);
 }
 
@@ -111,6 +115,12 @@ static int read_symbol(FILE *in, struct sym_entry *s)
                         fprintf(stderr, "Read error or end of file.\n");
                 return -1;
         }
+        if (strlen(str) > KSYM_NAME_LEN) {
+                fprintf(stderr, "Symbol %s too long for kallsyms (%zu vs %d).\n"
+                                "Please increase KSYM_NAME_LEN both in kernel and kallsyms.c\n",
+                        str, strlen(str), KSYM_NAME_LEN);
+                return -1;
+        }
 
         sym = str;
         /* skip prefix char */
@@ -194,6 +204,9 @@ static int symbol_valid(struct sym_entry *s)
         int i;
         int offset = 1;
 
+        if (s->addr < kernel_start_addr)
+                return 0;
+
         /* skip prefix char */
         if (symbol_prefix_char && *(s->sym + 1) == symbol_prefix_char)
                 offset++;
@@ -646,6 +659,9 @@ int main(int argc, char **argv)
                                 if ((*p == '"' && *(p+2) == '"') || (*p == '\'' && *(p+2) == '\''))
                                         p++;
                                 symbol_prefix_char = *p;
+                        } else if (strncmp(argv[i], "--page-offset=", 14) == 0) {
+                                const char *p = &argv[i][14];
+                                kernel_start_addr = strtoull(p, NULL, 16);
                         } else
                                 usage();
                 }