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Subject[PATCH] vsprintf: Document %p parameters passed by reference
From: Geert Uytterhoeven <>

Make sure all %p extensions that take parameters by references are
documented to do so.

Signed-off-by: Geert Uytterhoeven <>
Documentation/printk-formats.txt | 15 +++++++++++++++
1 file changed, 15 insertions(+)

diff --git a/Documentation/printk-formats.txt b/Documentation/printk-formats.txt
index 6f4eb322ffaf..00d5c43e5d14 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:

@@ -100,6 +101,8 @@ 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:

@@ -114,6 +117,8 @@ 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
@@ -128,6 +133,8 @@ IPv6 addresses:
print a compressed IPv6 address as described by

+ Passed by reference.
IPv4/IPv6 addresses (generic, with port, flowinfo, scope):

%pIS or 0001:0002:0003:0004:0005:0006:0007:0008
@@ -154,6 +161,8 @@ IPv4/IPv6 addresses (generic, with port, flowinfo, scope):
specifiers can be used as well and are ignored in case of an IPv6

+ Passed by reference.
Further examples:

%pISfc or [1:2:3:4:5:6:7:8]/123456789
@@ -175,6 +184,8 @@ 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:
@@ -184,6 +195,8 @@ dentry names:
equivalent of %s dentry-> we used to use, %pd<n> prints
n last components. %pD does the same thing for struct file.

+ Passed by reference.
struct va_format:

@@ -199,6 +212,8 @@ 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, (unsigned long long):

printk("%llu", u64_var);

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