16 Oct, 2016
1 commit
-
Pull gcc plugins update from Kees Cook:
"This adds a new gcc plugin named "latent_entropy". It is designed to
extract as much possible uncertainty from a running system at boot
time as possible, hoping to capitalize on any possible variation in
CPU operation (due to runtime data differences, hardware differences,
SMP ordering, thermal timing variation, cache behavior, etc).At the very least, this plugin is a much more comprehensive example
for how to manipulate kernel code using the gcc plugin internals"* tag 'gcc-plugins-v4.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
latent_entropy: Mark functions with __latent_entropy
gcc-plugins: Add latent_entropy plugin
15 Oct, 2016
1 commit
-
Pull kbuild updates from Michal Marek:
- EXPORT_SYMBOL for asm source by Al Viro.
This does bring a regression, because genksyms no longer generates
checksums for these symbols (CONFIG_MODVERSIONS). Nick Piggin is
working on a patch to fix this.Plus, we are talking about functions like strcpy(), which rarely
change prototypes.- Fixes for PPC fallout of the above by Stephen Rothwell and Nick
Piggin- fixdep speedup by Alexey Dobriyan.
- preparatory work by Nick Piggin to allow architectures to build with
-ffunction-sections, -fdata-sections and --gc-sections- CONFIG_THIN_ARCHIVES support by Stephen Rothwell
- fix for filenames with colons in the initramfs source by me.
* 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild: (22 commits)
initramfs: Escape colons in depfile
ppc: there is no clear_pages to export
powerpc/64: whitelist unresolved modversions CRCs
kbuild: -ffunction-sections fix for archs with conflicting sections
kbuild: add arch specific post-link Makefile
kbuild: allow archs to select link dead code/data elimination
kbuild: allow architectures to use thin archives instead of ld -r
kbuild: Regenerate genksyms lexer
kbuild: genksyms fix for typeof handling
fixdep: faster CONFIG_ search
ia64: move exports to definitions
sparc32: debride memcpy.S a bit
[sparc] unify 32bit and 64bit string.h
sparc: move exports to definitions
ppc: move exports to definitions
arm: move exports to definitions
s390: move exports to definitions
m68k: move exports to definitions
alpha: move exports to actual definitions
x86: move exports to actual definitions
...
11 Oct, 2016
1 commit
-
The __latent_entropy gcc attribute can be used only on functions and
variables. If it is on a function then the plugin will instrument it for
gathering control-flow entropy. If the attribute is on a variable then
the plugin will initialize it with random contents. The variable must
be an integer, an integer array type or a structure with integer fields.These specific functions have been selected because they are init
functions (to help gather boot-time entropy), are called at unpredictable
times, or they have variable loops, each of which provide some level of
latent entropy.Signed-off-by: Emese Revfy
[kees: expanded commit message]
Signed-off-by: Kees Cook
21 Sep, 2016
1 commit
-
PARISC was the only architecture which selected the BROKEN_RODATA config
option. Drop it and remove the special handling from init.h as well.Signed-off-by: Helge Deller
09 Sep, 2016
1 commit
-
Introduce LD_DEAD_CODE_DATA_ELIMINATION option for architectures to
select to build with -ffunction-sections, -fdata-sections, and link
with --gc-sections. It requires some work (documented) to ensure all
unreferenced entrypoints are live, and requires toolchain and build
verification, so it is made a per-arch option for now.On a random powerpc64le build, this yelds a significant size saving,
it boots and runs fine, but there is a lot I haven't tested as yet, so
these savings may be reduced if there are bugs in the link.text data bss dec filename
11169741 1180744 1923176 14273661 vmlinux
10445269 1004127 1919707 13369103 vmlinux.dce~700K text, ~170K data, 6% removed from kernel image size.
Signed-off-by: Nicholas Piggin
Signed-off-by: Michal Marek
03 Aug, 2016
1 commit
-
There was only one use of __initdata_refok and __exit_refok
__init_refok was used 46 times against 82 for __ref.
Those definitions are obsolete since commit 312b1485fb50 ("Introduce new
section reference annotations tags: __ref, __refdata, __refconst")This patch removes the following compatibility definitions and replaces
them treewide./* compatibility defines */
#define __init_refok __ref
#define __initdata_refok __refdata
#define __exit_refok __refI can also provide separate patches if necessary.
(One patch per tree and check in 1 month or 2 to remove old definitions)[akpm@linux-foundation.org: coding-style fixes]
Link: http://lkml.kernel.org/r/1466796271-3043-1-git-send-email-fabf@skynet.be
Signed-off-by: Fabian Frederick
Cc: Ingo Molnar
Cc: Sam Ravnborg
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
22 Feb, 2016
1 commit
-
Instead of defining mark_rodata_ro() in each architecture, consolidate it.
Signed-off-by: Kees Cook
Acked-by: Will Deacon
Cc: Andrew Morton
Cc: Andy Gross
Cc: Andy Lutomirski
Cc: Ard Biesheuvel
Cc: Arnd Bergmann
Cc: Ashok Kumar
Cc: Borislav Petkov
Cc: Borislav Petkov
Cc: Brian Gerst
Cc: Catalin Marinas
Cc: Dan Williams
Cc: David Brown
Cc: David Hildenbrand
Cc: Denys Vlasenko
Cc: Emese Revfy
Cc: H. Peter Anvin
Cc: Helge Deller
Cc: James E.J. Bottomley
Cc: Linus Torvalds
Cc: Luis R. Rodriguez
Cc: Marc Zyngier
Cc: Mark Rutland
Cc: Mathias Krause
Cc: Michael Ellerman
Cc: Nicolas Pitre
Cc: PaX Team
Cc: Paul Gortmaker
Cc: Peter Zijlstra
Cc: Ross Zwisler
Cc: Russell King
Cc: Rusty Russell
Cc: Stephen Boyd
Cc: Thomas Gleixner
Cc: Toshi Kani
Cc: kernel-hardening@lists.openwall.com
Cc: linux-arch
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-parisc@vger.kernel.org
Link: http://lkml.kernel.org/r/1455748879-21872-2-git-send-email-keescook@chromium.org
Signed-off-by: Ingo Molnar
06 Jul, 2015
1 commit
-
Modular users will always be users of init functionality, but
users of init functionality are not necessarily always modules.Hence any functionality like module_init and module_exit would
be more at home in the module.h file. And module.h should
explicitly include init.h to make the dependency clear.We've already done all the legwork needed to ensure that this
move does not cause any build regressions due to implicit
header file include assumptions about where module_init lives.Cc: Rusty Russell
Acked-by: Rusty Russell
Signed-off-by: Paul Gortmaker
17 Jun, 2015
1 commit
-
The __cpuinit support was removed several releases ago in 3.11-rc1 with
commit 22f0a27367742f65130c0fb25ef00f7297e032c1 ("init.h: remove __cpuinit
sections from the kernel")People have had a chance to update their out of tree code, so now we remove
the no-op stubs to ensure no more new use cases can creep back in.Also delete the mention of __cpuinitdata from the tag script.
Signed-off-by: Paul Gortmaker
05 Mar, 2015
2 commits
-
Make it all a bit easier on the eyes:
- Move the __setup_param() lines right after their init functions
- Use consistent vertical spacing
- Use more horizontal spacing to make it look like regular C code
- Use standard comment styleCc: Luis R. Rodriguez
Cc: Andrew Morton
Cc: Andy Lutomirski
Cc: Borislav Petkov
Cc: Borislav Petkov
Cc: Dave Hansen
Cc: David Vrabel
Cc: Dexuan Cui
Cc: Greg Kroah-Hartman
Cc: H. Peter Anvin
Cc: Jan Beulich
Cc: Joonsoo Kim
Cc: Juergen Gross
Cc: Linus Torvalds
Cc: Pavel Machek
Cc: Thomas Gleixner
Cc: Tony Lindgren
Cc: Toshi Kani
Cc: Vlastimil Babka
Cc: Xishi Qiu
Cc: julia.lawall@lip6.fr
Signed-off-by: Ingo Molnar -
At times all you need is a kconfig variable to enable a feature,
by default but you may want to also enable / disable it through
a kernel parameter. In such cases the parameter routines to turn
the thing on / off are really simple. Just use a wrapper for
this, it lets us generalize the code and makes it easier to
associate parameters with related kernel configuration options.Signed-off-by: Luis R. Rodriguez
Cc: Andrew Morton
Cc: Andy Lutomirski
Cc: Borislav Petkov
Cc: Borislav Petkov
Cc: Dave Hansen
Cc: David Vrabel
Cc: Dexuan Cui
Cc: Greg Kroah-Hartman
Cc: H. Peter Anvin
Cc: JBeulich@suse.com
Cc: Jan Beulich
Cc: Joonsoo Kim
Cc: Juergen Gross
Cc: Linus Torvalds
Cc: Pavel Machek
Cc: Thomas Gleixner
Cc: Tony Lindgren
Cc: Toshi Kani
Cc: Vlastimil Babka
Cc: Xishi Qiu
Cc: julia.lawall@lip6.fr
Link: http://lkml.kernel.org/r/1425518654-3403-4-git-send-email-mcgrof@do-not-panic.com
Signed-off-by: Ingo Molnar
28 May, 2014
1 commit
-
We are getting randconfig build errors on device drivers with
tristate Kconfig option if they are using custom initcall
levels. Rather than add ifdeffery into the drivers, let's add
the missing initcall_sync variants.As the comment in init.h has kept people from updating the
list of initcalls that can be just module_init when the driver
is loaded as a loadable module, let's also update the comment
a bit to describe valid use cases custom initcall levels.While most drivers should nowadays use just regular module_init
because of the deferred probe, we do have quite a few custom
initcall levels left that we cannot remove until tested properly.There are also still few valid cases where a custom initcall
level might make sense that I'm aware of.For example a bus snooping driver can provide information about
invalid bus access and is handy loader early when built in. But
there's no hard dependency to have it necessarily built in and
a loadable module is a valid option.Another example is a driver implementing a Linux framework like
pinctrl framework. That driver may be needed early on some
platforms because of legacy reasons, while it can be just a
regular module_init on most platforms.Signed-off-by: Tony Lindgren
Cc: Arnd Bergmann
Signed-off-by: Greg Kroah-Hartman
14 Feb, 2014
1 commit
-
Work around a LTO gcc problem: when there is no reference to a variable
in a module it will be moved to the end of the program. This causes
reordering of initcalls which the kernel does not like.
Add a dummy reference function to avoid this. The function is
deleted by the linker.This replaces a previous much slower workaround.
Thanks to Jan "Honza" Hubička for suggesting this technique.
Suggested-by: Jan Hubička
Signed-off-by: Andi Kleen
Link: http://lkml.kernel.org/r/1391846481-31491-4-git-send-email-ak@linux.intel.com
Signed-off-by: H. Peter Anvin
11 Dec, 2013
1 commit
-
Add missing initcall variants when building for loadable modules.
This fixes this build error on powerpc allmodconfig:drivers/tty/ehv_bytechan.c: error: type defaults to 'int' in declaration of 'console_initcall' [-Werror=implicit-int]
Signed-off-by: Randy Dunlap
Reported-by: Geert Uytterhoeven
Cc: Benjamin Herrenschmidt
Acked-by: Timur Tabi
Signed-off-by: Greg Kroah-Hartman
13 Nov, 2013
1 commit
-
Initdata can be const since more than 5 years, using the __initconst
keyword.Signed-off-by: Geert Uytterhoeven
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
12 Sep, 2013
1 commit
-
When the rootfs code was a wrapper around ramfs, having them in the same
file made sense. Now that it can wrap another filesystem type, move it in
with the init code instead.This also allows a subsequent patch to access rootfstype= command line
arg.Signed-off-by: Rob Landley
Cc: Jeff Layton
Cc: Jens Axboe
Cc: Stephen Warren
Cc: Rusty Russell
Cc: Jim Cromie
Cc: Sam Ravnborg
Cc: Greg Kroah-Hartman
Cc: "Eric W. Biederman"
Cc: Alexander Viro
Cc: "H. Peter Anvin"
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
27 Jun, 2013
1 commit
-
The __cpuinit type of throwaway sections might have made sense
some time ago when RAM was more constrained, but now the savings
do not offset the cost and complications. For example, the fix in
commit 5e427ec2d0 ("x86: Fix bit corruption at CPU resume time")
is a good example of the nasty type of bugs that can be created
with improper use of the various __init prefixes.After a discussion on LKML[1] it was decided that cpuinit should go
the way of devinit and be phased out. Once all the users are gone,
we can then finally remove the macros themselves from linux/init.h.As an interim step, we can dummy out the macros to be no-ops, and
this will allow us to avoid a giant tree-wide patch, and instead
we can feed in smaller chunks mainly via the arch/ trees. This
is in keeping with commit 78d86c213f28193082b5d8a1a424044b7ba406f1
("init.h: Remove __dev* sections from the kernel")We don't strictly need to dummy out the macros to do this, but if
we don't then some harmless section mismatch warnings may temporarily
result. For example, notify_cpu_starting() and cpu_up() are arch
independent (kernel/cpu.c) and are flagged as __cpuinit. And hence
the calling functions in the arch specific code are also expected
to be __cpuinit -- if not, then we get the section mismatch warning.Two of the three __CPUINIT variants are not used whatsoever, and
so they are simply removed directly at this point in time.[1] https://lkml.org/lkml/2013/5/20/589
Signed-off-by: Paul Gortmaker
24 Jan, 2013
1 commit
-
To receive f56c3196f251012de9b3ebaff55732a9074fdaae ("async: fix
__lowest_in_progress()").Signed-off-by: Tejun Heo
19 Jan, 2013
1 commit
-
This patch adds default module loading and uses it to load the default
block elevator. During boot, it's called right after initramfs or
initrd is made available and right before control is passed to
userland. This ensures that as long as the modules are available in
the usual places in initramfs, initrd or the root filesystem, the
default modules are loaded as soon as possible.This will replace the on-demand elevator module loading from elevator
init path.v2: Fixed build breakage when !CONFIG_BLOCK. Reported by kbuild test
robot.Signed-off-by: Tejun Heo
Cc: Jens Axboe
Cc: Arjan van de Ven
Cc: Linus Torvalds
Cc: Alex Riesen
Cc: Fengguang We
11 Jan, 2013
1 commit
-
Now that all in-kernel users of __dev* are gone, let's remove them from
init.h to keep them from popping up again and again.Thanks to Bill Pemberton for doing all of the hard work to make removal
of this possible.Cc: Bill Pemberton
Cc: Stephen Rothwell
Signed-off-by: Greg Kroah-Hartman
18 Dec, 2012
1 commit
-
Currently the __define_initcall() macro takes three arguments, fn, id and
level. The level argument is exactly the same as the id argument but
wrapped in quotes. To overcome this need to specify three arguments to
the __define_initcall macro, where one argument is the stringification of
another, we can just use the stringification macro instead.Signed-off-by: Matthew Leach
Cc: Benjamin Herrenschmidt
Cc: Rusty Russell
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
01 Dec, 2012
1 commit
-
With the recent work to remove CONFIG_HOTPLUG, we are starting to get a
bunch of __devinit section warnings, despite CONFIG_HOTPLUG always being
enabled. So, stop marking the sections entirely, by defining them away
the section markings in init.hAcked-by: Sam Ravnborg
Signed-off-by: Greg Kroah-Hartman
06 Oct, 2012
1 commit
-
The PA-RISC tool chain seems to have some problem with correct
read/write attributes on sections. This causes problems when the const
sections are fixed up for other architecture to only contain truly
read-only data.Disable const sections for PA-RISC
This can cause a bit of noise with modpost.
Signed-off-by: Andi Kleen
Cc: "James E.J. Bottomley"
Cc: Helge Deller
Acked-by: Sam Ravnborg
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
27 Jul, 2012
1 commit
-
main.c has initcall_level_names[] for parse_args to print in debug messages,
add comments to keep them in sync with initcalls defined in init.h.Also add "loadable" into comment re not using *_initcall macros in
modules, to disambiguate from kernel/params.c and other builtins.Signed-off-by: Jim Cromie
Acked-by: Borislav Petkov
Signed-off-by: Rusty Russell
13 Jan, 2012
1 commit
-
module_param(bool) used to counter-intuitively take an int. In
fddd5201 (mid-2009) we allowed bool or int/unsigned int using a messy
trick.It's time to remove the int/unsigned int option. For this version
it'll simply give a warning, but it'll break next kernel version.Signed-off-by: Rusty Russell
17 May, 2011
1 commit
-
The init and exit sections should not be traced and adding a call to
mcount to them is a waste of text and instruction cache. Have the
macro section attributes include notrace to ignore these functions
for tracing from the build.Link: http://lkml.kernel.org/r/20110421023738.953028219@goodmis.org
Signed-off-by: Steven Rostedt
23 Oct, 2010
1 commit
-
The __ref* tags may have been confusing for new kernel
developers (I was confused by them for sure) so adding a few
more sentences to comment to clear things up for people who
see those for the first time.Signed-off-by: Michal Nazarewicz
Acked-by: Uwe Kleine-König
Acked-by: Sam Ravnborg
Signed-off-by: Greg Kroah-Hartman
03 Mar, 2010
1 commit
-
Signed-off-by: Denys Vlasenko
Signed-off-by: Michal Marek
16 Dec, 2009
1 commit
-
In order to diagnose overall suspend/resume times, we need
basic instrumentation to break down the total time into per
device timing, similar to initcall_debug.This patch adds the basic timing instrumentation, needed
for a scritps/bootgraph.pl equivalent or humans.
The bootgraph.pl program is still a work in progress, but
is far enough along to know that this patch is sufficient.Signed-off-by: Arjan van de Ven
Signed-off-by: Rafael J. Wysocki
02 Oct, 2009
1 commit
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Complete the early_initcall() API by making it available in modules
too. To be used by the EDAC/MCE code.Signed-off-by: Borislav Petkov
Acked-by: Linus Torvalds
Cc: Andi Kleen
LKML-Reference:
Signed-off-by: Ingo Molnar
22 Aug, 2009
1 commit
-
Some of the NOPs tables aren't used on 64-bits, quite some code and
data is needed post-init for module loading only, and a couple of
functions aren't used outside that file (i.e. can be static, and don't
need to be exported).The change to __INITDATA/__INITRODATA is needed to avoid an assembler
warning.Signed-off-by: Jan Beulich
LKML-Reference:
Acked-by: Sam Ravnborg
Signed-off-by: H. Peter Anvin
19 Jun, 2009
1 commit
-
Call constructors (gcc-generated initcall-like functions) during kernel
start and module load. Constructors are e.g. used for gcov data
initialization.Disable constructor support for usermode Linux to prevent conflicts with
host glibc.Signed-off-by: Peter Oberparleiter
Acked-by: Rusty Russell
Acked-by: WANG Cong
Cc: Sam Ravnborg
Cc: Jeff Dike
Cc: Andi Kleen
Cc: Huang Ying
Cc: Li Wei
Cc: Michael Ellerman
Cc: Ingo Molnar
Cc: Heiko Carstens
Cc: Martin Schwidefsky
Cc: Al Viro
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
17 Jun, 2009
1 commit
-
Now we have __initconst, we can finally move the external declarations for
the various Linux logo structures to .James' ack dates back to the previous submission (way to long ago), when the
logos were still __initdata, which caused failures on some platforms with some
toolchain versions.Signed-off-by: Geert Uytterhoeven
Acked-by: James Simmons
Cc: Krzysztof Helt
Cc: Sam Ravnborg
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
15 Jun, 2009
1 commit
-
Updated after review by Tim Abbott.
- Use HEAD_TEXT_SECTION
- Drop use of section-names.h and delete file
- Introduce EXIT_CALLDeleting section-names.h required a few simple
updates of init.hSigned-off-by: Sam Ravnborg
Cc: Tim Abbott
10 Jun, 2009
1 commit
-
- add .init.rodata to INIT_DATA, and group all initconst flavors
together
- move strings generated from __setup_param() into .init.rodata
- add .*init.rodata to modpost's sets of init sections
- make modpost warn about references between meminit and cpuinit
as well as memexit and cpuexit sections (as CPU and memory
hotplug are independently selectable features)Signed-off-by: Jan Beulich
Signed-off-by: Sam Ravnborg
28 Apr, 2009
1 commit
-
The old refok sections
.text.init.refok
.data.init.refok
.exit.text.refokhave been deprecated since commit
312b1485fb509c9bc32eda28ad29537896658cb8. After the other patches in
this patch series nothing is put in these sections, so clean things up
by eliminating all the remaining references to them.Signed-off-by: Tim Abbott
Acked-by: Sam Ravnborg
Signed-off-by: Linus Torvalds
27 Apr, 2009
1 commit
-
This patch is preparation for replacing all uses of ".head.text" or
".text.head" in the kernel with macros, so that the section name can
later be changed without having to touch a lot of the kernel.Since some linker scripts do more complex things than referencing
HEAD_TEXT, we add a HEAD_TEXT_SECTION macro that just contains the
actual name.I've defined HEAD_TEXT_SECTION in a new header,
include/linux/section-names.h, so that this section name only needs to
appear in one place. I anticipate creating similar macro structures
for a number of other section names.The long-term goal here is to be able to change the kernel's magic
section names to those that are compatible with -ffunction-sections
-fdata-sections. This requires renaming all magic sections with names
of the form ".text.foo".Signed-off-by: Tim Abbott
Signed-off-by: Linus Torvalds
17 Apr, 2009
1 commit
-
V3 of the early platform driver implementation.
Platform drivers are great for embedded platforms because we can separate
driver configuration from the actual driver. So base addresses,
interrupts and other configuration can be kept with the processor or board
code, and the platform driver can be reused by many different platforms.For early devices we have nothing today. For instance, to configure early
timers and early serial ports we cannot use platform devices. This
because the setup order during boot. Timers are needed before the
platform driver core code is available. The same goes for early printk
support. Early in this case means before initcalls.These early drivers today have their configuration either hard coded or
they receive it using some special configuration method. This is working
quite well, but if we want to support both regular kernel modules and
early devices then we need to have two ways of configuring the same
driver. A single way would be better.The early platform driver patch is basically a set of functions that allow
drivers to register themselves and architecture code to locate them and
probe. Registration happens through early_param(). The time for the
probe is decided by the architecture code.See Documentation/driver-model/platform.txt for more details.
[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Magnus Damm
Cc: Paul Mundt
Cc: Kay Sievers
Cc: David Brownell
Cc: Tejun Heo
Signed-off-by: Andrew Morton
Signed-off-by: Greg Kroah-Hartman
30 Oct, 2008
1 commit
-
Add rodata equivalents for assembly use, and fix the section attributes
used by __REFCONST.Signed-off-by: Jan Beulich
Signed-off-by: Andrew Morton
Signed-off-by: Sam Ravnborg
21 Oct, 2008
1 commit
-
…l/git/tip/linux-2.6-tip
* 'tracing-v28-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (131 commits)
tracing/fastboot: improve help text
tracing/stacktrace: improve help text
tracing/fastboot: fix initcalls disposition in bootgraph.pl
tracing/fastboot: fix bootgraph.pl initcall name regexp
tracing/fastboot: fix issues and improve output of bootgraph.pl
tracepoints: synchronize unregister static inline
tracepoints: tracepoint_synchronize_unregister()
ftrace: make ftrace_test_p6nop disassembler-friendly
markers: fix synchronize marker unregister static inline
tracing/fastboot: add better resolution to initcall debug/tracing
trace: add build-time check to avoid overrunning hex buffer
ftrace: fix hex output mode of ftrace
tracing/fastboot: fix initcalls disposition in bootgraph.pl
tracing/fastboot: fix printk format typo in boot tracer
ftrace: return an error when setting a nonexistent tracer
ftrace: make some tracers reentrant
ring-buffer: make reentrant
ring-buffer: move page indexes into page headers
tracing/fastboot: only trace non-module initcalls
ftrace: move pc counter in irqtrace
...Manually fix conflicts:
- init/main.c: initcall tracing
- kernel/module.c: verbose level vs tracepoints
- scripts/bootgraph.pl: fallout from cherry-picking commits.