* [PATCH] Documentation: Mention why %p prints ptrval
@ 2018-03-22 5:23 ` Joel Stanley
0 siblings, 0 replies; 6+ messages in thread
From: Joel Stanley @ 2018-03-22 5:23 UTC (permalink / raw)
To: Jonathan Corbet, Tobin C . Harding
Cc: Michael Ellerman, linux-doc, linux-kernel
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>
---
Documentation/core-api/printk-formats.rst | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
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
-------------------------
--
2.15.1
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^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH] Documentation: Mention why %p prints ptrval
@ 2018-03-22 5:23 ` Joel Stanley
0 siblings, 0 replies; 6+ messages in thread
From: Joel Stanley @ 2018-03-22 5:23 UTC (permalink / raw)
To: Jonathan Corbet, Tobin C . Harding
Cc: Michael Ellerman, linux-doc, linux-kernel
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>
---
Documentation/core-api/printk-formats.rst | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
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
-------------------------
--
2.15.1
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH] Documentation: Mention why %p prints ptrval
2018-03-22 5:23 ` Joel Stanley
@ 2018-03-22 20:12 ` Tobin C . Harding
-1 siblings, 0 replies; 6+ messages in thread
From: Tobin C . Harding @ 2018-03-22 20:12 UTC (permalink / raw)
To: Joel Stanley; +Cc: Jonathan Corbet, Michael Ellerman, linux-doc, linux-kernel
On Thu, Mar 22, 2018 at 03:53:36PM +1030, Joel Stanley wrote:
> 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>
> ---
> Documentation/core-api/printk-formats.rst | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> 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.
Acked-by: Tobin C. Harding <me@tobin.cc>
thanks,
Tobin.
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] Documentation: Mention why %p prints ptrval
@ 2018-03-22 20:12 ` Tobin C . Harding
0 siblings, 0 replies; 6+ messages in thread
From: Tobin C . Harding @ 2018-03-22 20:12 UTC (permalink / raw)
To: Joel Stanley; +Cc: Jonathan Corbet, Michael Ellerman, linux-doc, linux-kernel
On Thu, Mar 22, 2018 at 03:53:36PM +1030, Joel Stanley wrote:
> 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>
> ---
> Documentation/core-api/printk-formats.rst | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> 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.
Acked-by: Tobin C. Harding <me@tobin.cc>
thanks,
Tobin.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] Documentation: Mention why %p prints ptrval
2018-03-22 5:23 ` Joel Stanley
@ 2018-03-23 18:42 ` Jonathan Corbet
-1 siblings, 0 replies; 6+ messages in thread
From: Jonathan Corbet @ 2018-03-23 18:42 UTC (permalink / raw)
To: Joel Stanley; +Cc: Tobin C . Harding, Michael Ellerman, linux-doc, linux-kernel
On Thu, 22 Mar 2018 15:53:36 +1030
Joel Stanley <joel@jms.id.au> wrote:
> 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.
Applied, thanks.
jon
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^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2018-03-23 18:42 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
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2018-03-22 5:23 [PATCH] Documentation: Mention why %p prints ptrval Joel Stanley
2018-03-22 5:23 ` Joel Stanley
2018-03-22 20:12 ` Tobin C . Harding
2018-03-22 20:12 ` Tobin C . Harding
2018-03-23 18:42 ` Jonathan Corbet
2018-03-23 18:42 ` Jonathan Corbet
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