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    Subject[PATCH] printk-formats.txt documentation update
    From
    From: Andrew Murray <amurray@mpc-data.co.uk>

    This patch updates the incomplete documentation concerning the printk
    extended format specifiers.

    Signed-off-by: Andrew Murray <amurray@mpc-data.co.uk>
    ---
    diff --git a/Documentation/printk-formats.txt b/Documentation/printk-formats.txt
    index 1b5a5dd..df14336 100644
    --- a/Documentation/printk-formats.txt
    +++ b/Documentation/printk-formats.txt
    @@ -9,7 +9,42 @@ If variable is of Type, use printk format specifier:
    size_t %zu or %zx
    ssize_t %zd or %zx

    -Raw pointer value SHOULD be printed with %p.
    +Raw pointer value SHOULD be printed with %p. The kernel supports
    +the following extended format specifiers for pointer types:
    +
    + General:
    +
    + %pF function pointer with offset, e.g. module_start
    + %pf function pointer without offset, e.g. module_start+0x0/0x62 [hello]
    + %pS text symbol with offset
    + %ps text symbol without offset
    + %pR struct resource with decoded flags, e.g. [mem 0x0-0x1f 64 bit pref]
    + %pr struct resource with raw flags, e.g. [mem 0x0-0x1f flags 0x201]
    +
    + MAC/FDDI addresses:
    +
    + %pM colon-seperated 6-byte MAC address in hex notation, e.g. 00:01:02:03:04:05
    + %pm non-colon-seperated 6-byte MAC address is hex notation, e.g. 000102030405
    + %pMF 6-byte dash-separated FDDI hex notation
    +
    + IPv4 addresses:
    +
    + %pI4 IPv4 dot-seperated decimal without leading 0's, e.g. 1.2.3.4
    + %pi4 IPv4 dot-seperated decimal with leading 0's, 001.002.003.004
    + %p[Ii]4[hl] IPv4 dot-seperated decimal with/without leading 0's for
    + host (h), little (l) or network/big (default) endian order
    +
    + IPv6 addresses:
    + %pI6 IPv6 colon-seperated network-order 16 bit hex with leading 0's,
    + e.g. 0001:0203:...:0708
    + %pi6 IPv6 non-colon-seperated network-order 16 bit hex with leading 0's,
    + e.g. 000102...0f
    + %pI6c IPv6 address as described by
    + http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00,
    + e.g. 1::708
    +
    + %pU[bBlL] 16 byte UUID/GUID in big or little endian using lower or upper case
    +

    u64 SHOULD be printed with %llu/%llx, (unsigned long long):

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