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| author | Joel Stanley <joel@jms.id.au> | 2018-03-22 15:53:36 +1030 |
|---|---|---|
| committer | Jonathan Corbet <corbet@lwn.net> | 2018-03-23 12:42:18 -0600 |
| commit | 156383b190cd1b240a4c8636c9ce7a2a42938b24 (patch) | |
| tree | 1047ad0ee533affcaa2ac45af72e4961284f1cd9 /Documentation/core-api | |
| parent | bf02d491237eea10290bd379bf7fc8c37ac6c3b4 (diff) | |
| download | op-kernel-dev-156383b190cd1b240a4c8636c9ce7a2a42938b24.zip op-kernel-dev-156383b190cd1b240a4c8636c9ce7a2a42938b24.tar.gz | |
Documentation: Mention why %p prints ptrval
When debugging recent kernels, people will see '(ptrval)' but there
isn't much information as to what that means. Briefly describe why it's
there.
Signed-off-by: Joel Stanley <joel@jms.id.au>
Acked-by: Tobin C. Harding <me@tobin.cc>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Diffstat (limited to 'Documentation/core-api')
| -rw-r--r-- | Documentation/core-api/printk-formats.rst | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/Documentation/core-api/printk-formats.rst b/Documentation/core-api/printk-formats.rst index 934559b..eb30efd 100644 --- a/Documentation/core-api/printk-formats.rst +++ b/Documentation/core-api/printk-formats.rst @@ -60,8 +60,8 @@ Plain Pointers Pointers printed without a specifier extension (i.e unadorned %p) are hashed to prevent leaking information about the kernel memory layout. This has the added benefit of providing a unique identifier. On 64-bit machines -the first 32 bits are zeroed. If you *really* want the address see %px -below. +the first 32 bits are zeroed. The kernel will print ``(ptrval)`` until it +gathers enough entropy. If you *really* want the address see %px below. Symbols/Function Pointers ------------------------- |
