From 156383b190cd1b240a4c8636c9ce7a2a42938b24 Mon Sep 17 00:00:00 2001 From: Joel Stanley Date: Thu, 22 Mar 2018 15:53:36 +1030 Subject: 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 Acked-by: Tobin C. Harding Signed-off-by: Jonathan Corbet --- Documentation/core-api/printk-formats.rst | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'Documentation/core-api/printk-formats.rst') diff --git a/Documentation/core-api/printk-formats.rst b/Documentation/core-api/printk-formats.rst index 934559b3c130..eb30efdd2e78 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 ------------------------- -- cgit