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Diffstat (limited to 'Documentation/printk-formats.txt')
| -rw-r--r-- | Documentation/printk-formats.txt | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/Documentation/printk-formats.txt b/Documentation/printk-formats.txt index 71b62db7eca2..b4e668ac4fe3 100644 --- a/Documentation/printk-formats.txt +++ b/Documentation/printk-formats.txt @@ -5,7 +5,6 @@ How to get printk format specifiers right :Author: Randy Dunlap <rdunlap@infradead.org> :Author: Andrew Murray <amurray@mpc-data.co.uk> - Integer types ============= @@ -45,6 +44,17 @@ return from vsnprintf. Raw pointer value SHOULD be printed with %p. The kernel supports the following extended format specifiers for pointer types: +Pointer Types +============= + +Pointers printed without a specifier extension (i.e unadorned %p) are +hashed to give a unique identifier without leaking kernel addresses to user +space. On 64 bit machines the first 32 bits are zeroed. + +:: + + %p abcdef12 or 00000000abcdef12 + Symbols/Function Pointers ========================= |