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-rw-r--r--Documentation/printk-formats.txt15
1 files changed, 15 insertions, 0 deletions
diff --git a/Documentation/printk-formats.txt b/Documentation/printk-formats.txt
index 5a615c14f75d..71438f3eb0c0 100644
--- a/Documentation/printk-formats.txt
+++ b/Documentation/printk-formats.txt
@@ -54,6 +54,7 @@ Struct Resources:
For printing struct resources. The 'R' and 'r' specifiers result in a
printed resource with ('R') or without ('r') a decoded flags member.
+ Passed by reference.
Physical addresses types phys_addr_t:
@@ -132,6 +133,8 @@ MAC/FDDI addresses:
specifier to use reversed byte order suitable for visual interpretation
of Bluetooth addresses which are in the little endian order.
+ Passed by reference.
+
IPv4 addresses:
%pI4 1.2.3.4
@@ -146,6 +149,8 @@ IPv4 addresses:
host, network, big or little endian order addresses respectively. Where
no specifier is provided the default network/big endian order is used.
+ Passed by reference.
+
IPv6 addresses:
%pI6 0001:0002:0003:0004:0005:0006:0007:0008
@@ -160,6 +165,8 @@ IPv6 addresses:
print a compressed IPv6 address as described by
http://tools.ietf.org/html/rfc5952
+ Passed by reference.
+
IPv4/IPv6 addresses (generic, with port, flowinfo, scope):
%pIS 1.2.3.4 or 0001:0002:0003:0004:0005:0006:0007:0008
@@ -186,6 +193,8 @@ IPv4/IPv6 addresses (generic, with port, flowinfo, scope):
specifiers can be used as well and are ignored in case of an IPv6
address.
+ Passed by reference.
+
Further examples:
%pISfc 1.2.3.4 or [1:2:3:4:5:6:7:8]/123456789
@@ -207,6 +216,8 @@ UUID/GUID addresses:
Where no additional specifiers are used the default little endian
order with lower case hex characters will be printed.
+ Passed by reference.
+
dentry names:
%pd{,2,3,4}
%pD{,2,3,4}
@@ -216,6 +227,8 @@ dentry names:
equivalent of %s dentry->d_name.name we used to use, %pd<n> prints
n last components. %pD does the same thing for struct file.
+ Passed by reference.
+
struct va_format:
%pV
@@ -231,6 +244,8 @@ struct va_format:
Do not use this feature without some mechanism to verify the
correctness of the format string and va_list arguments.
+ Passed by reference.
+
u64 SHOULD be printed with %llu/%llx:
printk("%llu", u64_var);