| a8fab0744585c1ab61009bfc1a1958f28e1c864f |
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19-Oct-2013 |
Hannes Frederic Sowa <hannes@stressinduktion.org> |
x86/jump_label: expect default_nop if static_key gets enabled on boot-up
net_get_random_once(intrduced in the next patch) uses static_keys in
a way that they get enabled on boot-up instead of replaced with an
ideal_nop. So check for default_nop on initial enabling.
Other architectures don't check for this.
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Jason Baron <jbaron@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Eric Dumazet <edumazet@google.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: x86@kernel.org
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
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| fb40d7a8994a3cc7a1e1c1f3258ea8662a366916 |
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01-Feb-2012 |
Steven Rostedt <srostedt@redhat.com> |
x86/jump-label: Show where and what was wrong on errors
When modifying text sections for jump labels, a paranoid check is
performed. If the check fails, the system "bugs". But why it failed
is not shown.
The BUG_ON()s in the jump label update code is replaced with bug_at(ip).
This is a function that will show what pointer failed, and what was
at the location of the failure that made jump label panic.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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| 9c85f3bdf400665eecf62658a9106501f6a77a13 |
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27-Jan-2012 |
Steven Rostedt <srostedt@redhat.com> |
x86/jump-label: Add safety checks to jump label conversions
As with all modifying of kernel text, we need to be very paranoid.
When converting the jump label locations to and from nops to jumps
a check has been added to make sure what we are replacing is what we
expect, otherwise we bug.
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jason Baron <jbaron@redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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| 11570da1c5b1dee1dc1439159e967ee44214a78b |
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27-Jan-2012 |
Steven Rostedt <srostedt@redhat.com> |
x86/jump-label: Do not bother updating nops if they are correct
On boot up, the jump label init function scans all the jump label locations
and converts them to the best nop for the machine. If the nop is already
the ideal nop, do not bother with changing it.
Cc: Jason Baron <jbaron@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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| 51b2c07b22261f19188d9a9071943d60a067481c |
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12-Jul-2013 |
Jiri Kosina <jkosina@suse.cz> |
x86: Make jump_label use int3-based patching
Make jump labels use text_poke_bp() for text patching instead of
text_poke_smp(), avoiding the need for stop_machine().
Reviewed-by: Steven Rostedt <rostedt@goodmis.org>
Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Link: http://lkml.kernel.org/r/alpine.LNX.2.00.1307121120250.29788@pobox.suse.cz
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
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| 9cdbe1cbac4ec318037297175587a0080acc9d11 |
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06-Dec-2011 |
Peter Zijlstra <a.p.zijlstra@chello.nl> |
jump_label, x86: Fix section mismatch
WARNING: arch/x86/kernel/built-in.o(.text+0x4c71): Section mismatch in
reference from the function arch_jump_label_transform_static() to the
function .init.text:text_poke_early()
The function arch_jump_label_transform_static() references
the function __init text_poke_early().
This is often because arch_jump_label_transform_static lacks a __init
annotation or the annotation of text_poke_early is wrong.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Jason Baron <jbaron@redhat.com>
Link: http://lkml.kernel.org/n/tip-9lefe89mrvurrwpqw5h8xm8z@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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| e71a5be15e47a73a2964712967fe93ee8ccf551b |
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29-Sep-2011 |
Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> |
x86/jump_label: add arch_jump_label_transform_static()
This allows jump-label entries to be cheaply updated on code which is
not yet live.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Acked-by: Jason Baron <jbaron@redhat.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
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| b7e3155818830a358be2b736e1087217c43db9eb |
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29-Sep-2011 |
Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> |
x86/jump_label: drop arch_jump_label_text_poke_early()
It is no longer used.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Acked-by: Jason Baron <jbaron@redhat.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
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| 2f3aa7a06f6f48d6f78a90595b17e6beafa7abf6 |
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17-Aug-2011 |
Kevin Winchester <kjwinchester@gmail.com> |
x86: jump_label: arch_jump_label_text_poke_early: add missing __init
arch_jump_label_text_poke_early calls text_poke_early, which is
an __init function. Thus arch_jump_label_text_poke_early should
be the same.
Signed-off-by: Kevin Winchester <kjwinchester@gmail.com>
Cc: jbaron@redhat.com
Cc: tglx@linutronix.de
Cc: mingo@redhat.com
Cc: hpa@zytor.com
Cc: x86@kernel.org
Link: http://lkml.kernel.org/r/1313539478-30303-1-git-send-email-kjwinchester@gmail.com
[ Use __init_or_module instead of __init ]
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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| dc326fca2b640fc41aed7c015d0f456935a66255 |
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19-Apr-2011 |
H. Peter Anvin <hpa@linux.intel.com> |
x86, cpu: Clean up and unify the NOP selection infrastructure
Clean up and unify the NOP selection infrastructure:
- Make the atomic 5-byte NOP a part of the selection system.
- Pick NOPs once during early boot and then be done with it.
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jason Baron <jbaron@redhat.com>
Link: http://lkml.kernel.org/r/1303166160-10315-3-git-send-email-hpa@linux.intel.com
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| d9f5ab7b1c0a520867af389bab5d5fcdbd0e407e |
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17-Sep-2010 |
Jason Baron <jbaron@redhat.com> |
jump label: x86 support
add x86 support for jump label. I'm keeping this patch separate so its clear
to arch maintainers what was required for x86 support this new feature.
Hopefully, it wouldn't be too painful for other archs.
Signed-off-by: Jason Baron <jbaron@redhat.com>
LKML-Reference: <f838f49f40fbea0254036194be66dc48b598dcea.1284733808.git.jbaron@redhat.com>
[ cleaned up some formatting ]
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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