X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2Fvsprintf.c;h=dfd60192bc2ede37835fa8ed894bc024b0f1908a;hb=c1d10d18c542278b7fbc413c289d3cb6219da6b3;hp=02bcdd5feac43aca15528252cc6bfba7ea8a7a4f;hpb=dc87c55120b0a5b0c4d731183f8bb348981aba65;p=firefly-linux-kernel-4.4.55.git

diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 02bcdd5feac4..dfd60192bc2e 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -433,7 +433,9 @@ char *symbol_string(char *buf, char *end, void *ptr,
 	unsigned long value = (unsigned long) ptr;
 #ifdef CONFIG_KALLSYMS
 	char sym[KSYM_SYMBOL_LEN];
-	if (ext != 'f' && ext != 's')
+	if (ext == 'B')
+		sprint_backtrace(sym, value);
+	else if (ext != 'f' && ext != 's')
 		sprint_symbol(sym, value);
 	else
 		kallsyms_lookup(value, NULL, NULL, NULL, sym);
@@ -795,7 +797,7 @@ char *uuid_string(char *buf, char *end, const u8 *addr,
 	return string(buf, end, uuid, spec);
 }
 
-int kptr_restrict = 1;
+int kptr_restrict __read_mostly;
 
 /*
  * Show a '%p' thing.  A kernel extension is that the '%p' is followed
@@ -808,6 +810,7 @@ int kptr_restrict = 1;
  * - 'f' For simple symbolic function names without offset
  * - 'S' For symbolic direct pointers with offset
  * - 's' For symbolic direct pointers without offset
+ * - 'B' For backtraced symbolic direct pointers with offset
  * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
  * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
  * - 'M' For a 6-byte MAC address, it prints the address in the
@@ -867,6 +870,7 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
 		/* Fallthrough */
 	case 'S':
 	case 's':
+	case 'B':
 		return symbol_string(buf, end, ptr, spec, *fmt);
 	case 'R':
 	case 'r':
@@ -1134,6 +1138,7 @@ qualifier:
  * %ps output the name of a text symbol without offset
  * %pF output the name of a function pointer with its offset
  * %pf output the name of a function pointer without its offset
+ * %pB output the name of a backtrace symbol with its offset
  * %pR output the address range in a struct resource with decoded flags
  * %pr output the address range in a struct resource with raw flags
  * %pM output a 6-byte MAC address with colons