* [PATCH v2] x86/stacktrace: update kconfig help text for reliable unwinders
@ 2019-11-07 3:29 Joe Lawrence
2019-11-07 3:34 ` Josh Poimboeuf
` (2 more replies)
0 siblings, 3 replies; 5+ messages in thread
From: Joe Lawrence @ 2019-11-07 3:29 UTC (permalink / raw)
To: linux-kernel, live-patching; +Cc: Josh Poimboeuf
commit 6415b38bae26 ("x86/stacktrace: Enable HAVE_RELIABLE_STACKTRACE
for the ORC unwinder") added the ORC unwinder as a "reliable" unwinder.
Update the help text to reflect that change: the frame pointer unwinder
is no longer the only one that can provide HAVE_RELIABLE_STACKTRACE.
Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com>
---
v2: dropped hunk that added unnecessary text to UNWIND_GUESS
arch/x86/Kconfig.debug | 4 ----
1 file changed, 4 deletions(-)
diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug
index bf9cd83de777..409c00f74e60 100644
--- a/arch/x86/Kconfig.debug
+++ b/arch/x86/Kconfig.debug
@@ -316,10 +316,6 @@ config UNWINDER_FRAME_POINTER
unwinder, but the kernel text size will grow by ~3% and the kernel's
overall performance will degrade by roughly 5-10%.
- This option is recommended if you want to use the livepatch
- consistency model, as this is currently the only way to get a
- reliable stack trace (CONFIG_HAVE_RELIABLE_STACKTRACE).
-
config UNWINDER_GUESS
bool "Guess unwinder"
depends on EXPERT
--
2.21.0
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH v2] x86/stacktrace: update kconfig help text for reliable unwinders
2019-11-07 3:29 [PATCH v2] x86/stacktrace: update kconfig help text for reliable unwinders Joe Lawrence
@ 2019-11-07 3:34 ` Josh Poimboeuf
2019-11-07 14:54 ` Petr Mladek
2019-11-07 8:44 ` Miroslav Benes
2019-11-07 12:23 ` Kamalesh Babulal
2 siblings, 1 reply; 5+ messages in thread
From: Josh Poimboeuf @ 2019-11-07 3:34 UTC (permalink / raw)
To: Joe Lawrence; +Cc: linux-kernel, live-patching
On Wed, Nov 06, 2019 at 10:29:58PM -0500, Joe Lawrence wrote:
> commit 6415b38bae26 ("x86/stacktrace: Enable HAVE_RELIABLE_STACKTRACE
> for the ORC unwinder") added the ORC unwinder as a "reliable" unwinder.
> Update the help text to reflect that change: the frame pointer unwinder
> is no longer the only one that can provide HAVE_RELIABLE_STACKTRACE.
>
> Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com>
> ---
>
> v2: dropped hunk that added unnecessary text to UNWIND_GUESS
>
> arch/x86/Kconfig.debug | 4 ----
> 1 file changed, 4 deletions(-)
>
> diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug
> index bf9cd83de777..409c00f74e60 100644
> --- a/arch/x86/Kconfig.debug
> +++ b/arch/x86/Kconfig.debug
> @@ -316,10 +316,6 @@ config UNWINDER_FRAME_POINTER
> unwinder, but the kernel text size will grow by ~3% and the kernel's
> overall performance will degrade by roughly 5-10%.
>
> - This option is recommended if you want to use the livepatch
> - consistency model, as this is currently the only way to get a
> - reliable stack trace (CONFIG_HAVE_RELIABLE_STACKTRACE).
> -
> config UNWINDER_GUESS
> bool "Guess unwinder"
> depends on EXPERT
> --
> 2.21.0
>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
--
Josh
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH v2] x86/stacktrace: update kconfig help text for reliable unwinders
2019-11-07 3:29 [PATCH v2] x86/stacktrace: update kconfig help text for reliable unwinders Joe Lawrence
2019-11-07 3:34 ` Josh Poimboeuf
@ 2019-11-07 8:44 ` Miroslav Benes
2019-11-07 12:23 ` Kamalesh Babulal
2 siblings, 0 replies; 5+ messages in thread
From: Miroslav Benes @ 2019-11-07 8:44 UTC (permalink / raw)
To: Joe Lawrence; +Cc: linux-kernel, live-patching, Josh Poimboeuf
On Wed, 6 Nov 2019, Joe Lawrence wrote:
> commit 6415b38bae26 ("x86/stacktrace: Enable HAVE_RELIABLE_STACKTRACE
> for the ORC unwinder") added the ORC unwinder as a "reliable" unwinder.
> Update the help text to reflect that change: the frame pointer unwinder
> is no longer the only one that can provide HAVE_RELIABLE_STACKTRACE.
>
> Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com>
Acked-by: Miroslav Benes <mbenes@suse.cz>
M
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH v2] x86/stacktrace: update kconfig help text for reliable unwinders
2019-11-07 3:29 [PATCH v2] x86/stacktrace: update kconfig help text for reliable unwinders Joe Lawrence
2019-11-07 3:34 ` Josh Poimboeuf
2019-11-07 8:44 ` Miroslav Benes
@ 2019-11-07 12:23 ` Kamalesh Babulal
2 siblings, 0 replies; 5+ messages in thread
From: Kamalesh Babulal @ 2019-11-07 12:23 UTC (permalink / raw)
To: Joe Lawrence, linux-kernel, live-patching; +Cc: Josh Poimboeuf
On 11/7/19 8:59 AM, Joe Lawrence wrote:
> commit 6415b38bae26 ("x86/stacktrace: Enable HAVE_RELIABLE_STACKTRACE
> for the ORC unwinder") added the ORC unwinder as a "reliable" unwinder.
> Update the help text to reflect that change: the frame pointer unwinder
> is no longer the only one that can provide HAVE_RELIABLE_STACKTRACE.
>
> Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com>
Reviewed-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
--
Kamalesh
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH v2] x86/stacktrace: update kconfig help text for reliable unwinders
2019-11-07 3:34 ` Josh Poimboeuf
@ 2019-11-07 14:54 ` Petr Mladek
0 siblings, 0 replies; 5+ messages in thread
From: Petr Mladek @ 2019-11-07 14:54 UTC (permalink / raw)
To: Josh Poimboeuf; +Cc: Joe Lawrence, linux-kernel, live-patching
On Wed 2019-11-06 21:34:58, Josh Poimboeuf wrote:
> On Wed, Nov 06, 2019 at 10:29:58PM -0500, Joe Lawrence wrote:
> > commit 6415b38bae26 ("x86/stacktrace: Enable HAVE_RELIABLE_STACKTRACE
> > for the ORC unwinder") added the ORC unwinder as a "reliable" unwinder.
> > Update the help text to reflect that change: the frame pointer unwinder
> > is no longer the only one that can provide HAVE_RELIABLE_STACKTRACE.
> >
> > Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com>
>
> Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
It is committed in livepatch.git, branch for-5.5/core.
Best Regards,
Petr
^ permalink raw reply [flat|nested] 5+ messages in thread
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2019-11-07 3:29 [PATCH v2] x86/stacktrace: update kconfig help text for reliable unwinders Joe Lawrence
2019-11-07 3:34 ` Josh Poimboeuf
2019-11-07 14:54 ` Petr Mladek
2019-11-07 8:44 ` Miroslav Benes
2019-11-07 12:23 ` Kamalesh Babulal
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