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krealloc() must not be used against devm_*() allocated
memory regions:
- if a bigger memory is to be allocated, krealloc() and
__krealloc() could return a different pointer than the
one given to them, creating a memory region which is not
managed, thus it will not be automatically released on
device removal.
- if a bigger memory is to be allocated, krealloc() could
kfree() the managed memory region which is passed to it.
The old pointer is left registered as a resource for the
device. On device removal, this dangling pointer will be
used and an unrelated memory region could be released.
- if the requested size is equal to 0, krealloc() can also
just behave like kfree(). Here too, the old pointer is
kept associated with the device. On device removal, this
invalid pointer will be used and an unrelated memory
region could be released.
For all these reasons, krealloc() must not be used on a
pointer returned by devm_*() functions.
Cc: Tejun Heo <tj@kernel.org>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Yann Droneaud <ydroneaud@opteya.com>
Signed-off-by: Michal Marek <mmarek@suse.com>
Since commit 3ef0e5ba4673 ('slab: introduce kzfree()'),
kfree() is no more the only function to be considered:
kzfree() should be recognized too.
In particular, kzfree() must not be called on memory
allocated through devm_*() functions.
Cc: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Yann Droneaud <ydroneaud@opteya.com>
Signed-off-by: Michal Marek <mmarek@suse.com>
Documentation/coccinelle.txt suggests using the SPFLAGS
make variable to pass additional options to spatch.
Reorder the way SPFLAGS is added to FLAGS, to allow
for options in the SPFLAGS to override the default
--very-quiet option.
Similarly, rearrage the FLAGS for org or report mode.
This allows for overriding of the default --no-show-diff
option through SPFLAGS.
Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com>
Cc: Gilles Muller <Gilles.Muller@lip6.fr>
Acked-by: Nicolas Palix <nicolas.palix@imag.fr>
Acked-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Michal Marek <mmarek@suse.com>
I tried to use 'make O=...' from an unclean source tree. This triggered
the error path of setlocalversion. But by printing to STDOUT, it created
a broken localversion which then caused another (unrelated) error:
"4.7.0-rc2Error: kernelrelease not valid - run make prepare to update it" exceeds 64 characters
After printing to STDERR, the true build error gets displayed later:
/home/wsa/Kernel/linux is not clean, please run 'make mrproper'
in the '/home/wsa/Kernel/linux' directory.
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Michal Marek <mmarek@suse.com>
Add new rules to detect the cases where sizeof is used in
function calls as a argument.
Also, for the patch mode third rule should behave same as
second rule with arguments reversed. So, change that as well.
Signed-off-by: Vaishali Thakkar <vaishali.thakkar@oracle.com>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Michal Marek <mmarek@suse.com>
Make sign-file determine the format of the X.509 certificate by reading the
first two bytes and seeing if the first byte is 0x30 and the second
0x81-0x84. If this is the case, assume it's DER encoded, otherwise assume
it to be PEM encoded.
Without this, it gets awkward to deal with the error messages from
d2i_X509_bio() when we want to call BIO_reset() and then PEM_read_bio() in
case the certificate was PEM encoded rather than X.509 encoded.
Reported-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: David Howells <dhowells@redhat.com>
Tested-by: Ben Hutchings <ben@decadent.org.uk>
cc: David Woodhouse <dwmw2@infradead.org>
cc: Juerg Haefliger <juerg.haefliger@hpe.com>
cc: Ben Hutchings <ben@decadent.org.uk>
- ptrace: Fix out of bounds array access warning from Khem Raj
- pseries: Fix PCI config address for DDW from Gavin Shan
- pseries: Fix IBM_ARCH_VEC_NRCORES_OFFSET since POWER8NVL was added from Michael Ellerman
- of: fix autoloading due to broken modalias with no 'compatible' from Wolfram Sang
- radix: Fix always false comparison against MMU_NO_CONTEXT from Aneesh Kumar K.V
- hash: Compute the segment size correctly for ISA 3.0 from Aneesh Kumar K.V
- nohash: Fix build break with 64K pages from Michael Ellerman
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Merge tag 'powerpc-4.7-3Michael Ellerman:' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
Pull powerpc fixes from
- ptrace: Fix out of bounds array access warning from Khem Raj
- pseries: Fix PCI config address for DDW from Gavin Shan
- pseries: Fix IBM_ARCH_VEC_NRCORES_OFFSET since POWER8NVL was added
from Michael Ellerman
- of: fix autoloading due to broken modalias with no 'compatible' from
Wolfram Sang
- radix: Fix always false comparison against MMU_NO_CONTEXT from Aneesh
Kumar K.V
- hash: Compute the segment size correctly for ISA 3.0 from Aneesh
Kumar K.V
- nohash: Fix build break with 64K pages from Michael Ellerman
* tag 'powerpc-4.7-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
powerpc/nohash: Fix build break with 64K pages
powerpc/mm/hash: Compute the segment size correctly for ISA 3.0
powerpc/mm/radix: Fix always false comparison against MMU_NO_CONTEXT
of: fix autoloading due to broken modalias with no 'compatible'
powerpc/pseries: Fix IBM_ARCH_VEC_NRCORES_OFFSET since POWER8NVL was added
powerpc/pseries: Fix PCI config address for DDW
powerpc/ptrace: Fix out of bounds array access warning
Scan all input files for EXPORT_SYMBOLs along with the explicitly
specified export files before actually parsing anything.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
If the kernel-doc comments for functions are not in the same file as the
EXPORT_SYMBOL statements, the -export and -internal output selections do
not work as expected. This is typically the case when the kernel-doc
comments are in header files next to the function declarations and the
EXPORT_SYMBOL statements are next to the function definitions in the
source files.
Let the user specify additional source files in which to look for the
EXPORT_SYMBOLs using the new -export-file FILE option, which may be
given multiple times.
The pathological example for this is include/net/mac80211.h, which has
all the kernel-doc documentation for the exported functions defined in a
plethora of source files net/mac80211/*.c.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Since
commit 32217761ee9db0215350dfe1ca4e66f312fb8c54
Author: Jani Nikula <jani.nikula@intel.com>
Date: Sun May 29 09:40:44 2016 +0300
kernel-doc: concatenate contents of colliding sections
we started getting (more) errors on duplicate section names, especially
on the default section name "Description":
include/net/mac80211.h:3174: warning: duplicate section name 'Description'
This is usually caused by a slightly unorthodox placement of parameter
descriptions, like in the above case, and kernel-doc resetting back to
the default section more than once within a kernel-doc comment.
Ignore warnings on the duplicate section name automatically assigned by
kernel-doc, and only consider explicitly user assigned duplicate section
names an issue.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Lots of kerneldoc entries use "example:" or "note:" as section headers.
Until such a time as we can make them use proper markup, make them work as
intended.
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Because of an improper dereference, a stray 'C' character was output to
the modalias when no 'compatible' was specified. This is the case for
some old PowerMac drivers which only set the 'name' property. Fix it to
let them match again.
Reported-by: Mathieu Malaterre <malat@debian.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Tested-by: Mathieu Malaterre <malat@debian.org>
Cc: Philipp Zabel <p.zabel@pengutronix.de>
Cc: Andreas Schwab <schwab@linux-m68k.org>
Fixes: 6543becf26fff6 ("mod/file2alias: make modalias generation safe for cross compiling")
Cc: stable@vger.kernel.org # v3.9+
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
The sancov gcc plugin inserts a __sanitizer_cov_trace_pc() call
at the start of basic blocks.
This plugin is a helper plugin for the kcov feature. It supports
all gcc versions with plugin support (from gcc-4.5 on).
It is based on the gcc commit "Add fuzzing coverage support" by Dmitry Vyukov
(https://gcc.gnu.org/viewcvs/gcc?limit_changes=0&view=revision&revision=231296).
Signed-off-by: Emese Revfy <re.emese@gmail.com>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Michal Marek <mmarek@suse.com>
Add a very simple plugin to demonstrate the GCC plugin infrastructure. This GCC
plugin computes the cyclomatic complexity of each function.
The complexity M of a function's control flow graph is defined as:
M = E - N + 2P
where
E = the number of edges
N = the number of nodes
P = the number of connected components (exit nodes).
Signed-off-by: Emese Revfy <re.emese@gmail.com>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Michal Marek <mmarek@suse.com>
This patch allows to build the whole kernel with GCC plugins. It was ported from
grsecurity/PaX. The infrastructure supports building out-of-tree modules and
building in a separate directory. Cross-compilation is supported too.
Currently the x86, arm, arm64 and uml architectures enable plugins.
The directory of the gcc plugins is scripts/gcc-plugins. You can use a file or a directory
there. The plugins compile with these options:
* -fno-rtti: gcc is compiled with this option so the plugins must use it too
* -fno-exceptions: this is inherited from gcc too
* -fasynchronous-unwind-tables: this is inherited from gcc too
* -ggdb: it is useful for debugging a plugin (better backtrace on internal
errors)
* -Wno-narrowing: to suppress warnings from gcc headers (ipa-utils.h)
* -Wno-unused-variable: to suppress warnings from gcc headers (gcc_version
variable, plugin-version.h)
The infrastructure introduces a new Makefile target called gcc-plugins. It
supports all gcc versions from 4.5 to 6.0. The scripts/gcc-plugin.sh script
chooses the proper host compiler (gcc-4.7 can be built by either gcc or g++).
This script also checks the availability of the included headers in
scripts/gcc-plugins/gcc-common.h.
The gcc-common.h header contains frequently included headers for GCC plugins
and it has a compatibility layer for the supported gcc versions.
The gcc-generate-*-pass.h headers automatically generate the registration
structures for GIMPLE, SIMPLE_IPA, IPA and RTL passes.
Note that 'make clean' keeps the *.so files (only the distclean or mrproper
targets clean all) because they are needed for out-of-tree modules.
Based on work created by the PaX Team.
Signed-off-by: Emese Revfy <re.emese@gmail.com>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Michal Marek <mmarek@suse.com>
Infrastructure for building independent shared library targets.
Based on work created by the PaX Team.
Signed-off-by: Emese Revfy <re.emese@gmail.com>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Michal Marek <mmarek@suse.com>
Opt-in since this wreaks the rst output and must be removed
by consumers again. This is useful to adjust the linenumbers
for included kernel-doc snippets in shinx. With that sphinx
error message will be accurate when there's issues with the
rst-ness of the kernel-doc comments.
Especially when transitioning a new docbook .tmpl to .rst this
is extremely useful, since you can just use your editors compilation
quickfix list to accurately jump from error to error.
v2:
- Also make sure that we filter the LINENO for purpose/at declaration
start so it only shows for selected blocks, not all of them (Jani).
While at it make it a notch more accurate.
- Avoid undefined $lineno issues. I tried filtering these out at the
callsite, but Jani spotted more when linting the entire kernel.
Unamed unions and similar things aren't stored consistently and end
up with an undefined line number (but also no kernel-doc text, just
the parameter type). Simplify things and filter undefined line
numbers in print_lineno() to catch them all.
v3: Fix LINENO 0 issue for kernel-doc comments without @param: lines
or any other special sections that directly jump to the description
after the "name - purpose" line. Only really possible for functions
without parameters. Noticed by Jani.
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: linux-doc@vger.kernel.org
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
state3 = prototype parsing, so name them accordingly.
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: linux-doc@vger.kernel.org
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Further up in the state machinery we switch from STATE_NAME to
STATE_DOCBLOCK when we match /$doc_block/. Which means this block of
code here is entirely unreachable, unless there are multiple DOC:
sections within a single kernel-doc comment.
Getting a list of all the files with more than one DOC: section using
$ git grep -c " * DOC:" | grep -v ":1$"
and then doing a full audit of them reveals there are no such comment
blocks in the kernel.
Supporting multiple DOC: sections in a single kernel-doc comment does
not seem like a recommended way of doing things anyway, so nuke the code
for simplicity.
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: linux-doc@vger.kernel.org
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
[Jani: amended the commit message]
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
If the documentation comment does not have params or sections, the
section heading may leak from the previous documentation comment.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
If there are multiple sections with the same section name, the current
implementation results in several sections by the same heading, with the
content duplicated from the last section to all. Even if there's the
error message, a more graceful approach is to combine all the
identically named sections into one, with concatenated contents.
With the supported sections already limited to select few, there are
massively fewer collisions than there used to be, but this is still
useful for e.g. when function parameters are documented in the middle of
a documentation comment, with description spread out above and
below. (This is not a recommended documentation style, but used in the
kernel nonetheless.)
We can now also demote the error to a warning.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
kernel-doc currently identifies anything matching "section header:"
(specifically a string of word characters and spaces followed by a
colon) as a new section in the documentation comment, and renders the
section header accordingly.
Unfortunately, this turns all uses of colon into sections, mostly
unintentionally. Considering the output, erroneously creating sections
when not intended is always worse than erroneously not creating sections
when intended. For example, a line with "http://example.com" turns into
a "http" heading followed by "//example.com" in normal text style, which
is quite ugly. OTOH, "WARNING: Beware of the Leopard" is just fine even
if "WARNING" does not turn into a heading.
It is virtually impossible to change all the kernel-doc comments, either
way. The compromise is to pick the most commonly used and depended on
section headers (with variants) and accept them as section headers.
The accepted section headers are, case insensitive:
* description:
* context:
* return:
* returns:
Additionally, case sensitive:
* @return:
All of the above are commonly used in the kernel-doc comments, and will
result in worse output if not identified as section headers. Also,
kernel-doc already has some special handling for all of them, so there's
nothing particularly controversial in adding more special treatment for
them.
While at it, improve the whitespace handling surrounding section
names. Do not consider the whitespace as part of the name.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
If a param description spans multiple lines, check any leading
whitespace in the first continuation line, and remove same amount of
whitespace from following lines.
This allows indentation in the multi-line parameter descriptions for
aesthetical reasons while not causing accidentally significant
indentation in the rst output.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Handle whitespace on the first line of param text as if it was the empty
string. There is no need to add the newline in this case. This improves
the rst output in particular, where blank lines may be problematic in
parameter lists.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Move away from field lists, and simply use **strong emphasis** for
section headings on lines of their own. Do not use rst section headings,
because their nesting depth depends on the surrounding context, which
kernel-doc has no knowledge of. Also, they do not need to end up in any
table of contexts or indexes.
There are two related immediate benefits. Field lists are typically
rendered in two columns, while the new style uses the horizontal width
better. With no extra indent on the left, there's no need to be as fussy
about it. Field lists are more susceptible to indentation problems than
the new style.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
The inline member markup allows whitespace lines before the actual
documentation starts. Strip the leading blank lines. This improves the
rst output.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
The use of these is confusing in the script, and per this grep, they're
not used anywhere anyway:
$ git grep " \* [%$&][a-zA-Z0-9_]*:" -- *.[ch] | grep -v "\$\(Id\|Revision\|Date\)"
While at it, throw out the constants array, nothing is ever put there
again.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link "&foo->bar", "&foo->bar()", "&foo.bar", and "&foo.bar()" to the
struct/union/enum foo definition. The members themselves do not
currently have anchors to link to, but this is better than nothing, and
promotes a universal notation.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Let the user use "&union foo" and "&typedef foo" to reference foo. The
difference to using "union &foo", "typedef &foo", or just "&foo" (which
are valid too) is that "union" and "typedef" become part of the link
text.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
It's possible to use &foo to reference structs, enums, typedefs, etc. in
the Sphinx C domain. Thus do not prefix the links with "struct".
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
If the user requests a specific DOC: section by name, do not output its
section title. In these cases, the surrounding context already has a
heading, and the DOC: section title is only used as an identifier and a
heading for clarity in the source file.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Make the output selection a bit more readable by adding constants for
the various types of output selection. While at it, actually call the
variable for choosing what to output $output_selection.
No functional changes.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Make the state machine a bit more readable by adding constants for
parser states and inline member documentation parser substates. While at
it, rename the "split" documentation to "inline" documentation.
No functional changes.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Currently we use docproc to figure out which symbols are exported, and
then docproc calls kernel-doc on specific functions, to get
documentation on exported functions. According to git blame and docproc
comments, this is due to historical reasons, as functions and their
corresponding EXPORT_SYMBOL* may have been in different files. However
for more than ten years the recommendation in CodingStyle has been to
place the EXPORT_SYMBOL* immediately after the closing function brace
line.
Additionally, the kernel-doc comments for functions are generally placed
above the function definition in the .c files (i.e. where the
EXPORT_SYMBOL* is) rather than above the declaration in the .h
files. There are some exceptions to this, but AFAICT none of these are
included in DocBook documentation using the "!E" docproc directive.
Therefore, assuming the EXPORT_SYMBOL* and kernel-doc are with the
function definition, kernel-doc can extract the exported vs. not
information by making two passes on the input file. Add support for that
via the new -export and -internal parameters.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
I'm not quite sure why the errors below are happening, but this fixes
them.
Use of uninitialized value in string ne at ./scripts/kernel-doc line 1819, <IN> line 6494.
Use of uninitialized value $_[0] in join or string at ./scripts/kernel-doc line 1759, <IN> line 6494.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Pull misc kbuild updates from Michal Marek:
"This is the non-critical part of kbuild:
- Coccinelle fixes, one semantic patch less in this round [Vaishali
Thakkar, Wolfram Sang, Kees Cook]
- rpm-pkg support for (open)SUSE's update-bootloader [Jiří Kosian]
- rpm-pkg restored support for $RPMOPTS [Srinivas Pandruvada]
- deb-pkg fixes for the linux-headers package [Bjørn Mork, Azriel
Samson]"
* 'misc' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild:
coccicheck: Fix missing 0 index in kill loop
scripts/package/Makefile: rpmbuild add support of RPMOPTS
builddeb: fix missing headers in linux-headers package
builddeb: include objtool binary in headers package
kbuild/mkspec: support 'update-bootloader'-based systems
scripts: coccinelle: remove check to move constants to right
Coccinelle: setup_timer: Add space in front of parentheses
Pull kconfig update from Michal Marek:
- fix for behavior of tristate choice items and fix for documentation
of existing kconfig behavior [Dirk Gouders]
- more helpful "unexpected data" kconfig warning [Paul Bolle]
* 'kconfig' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild:
kconfig/symbol.c: handle choice_values that depend on 'm' symbols
kconfig-language: elaborate on the type of a choice
kconfig-language: fix comment on dependency-generated menu structures.
kconfig: add unexpected data itself to warning
Pull kbuild updates from Michal Marek:
- new option CONFIG_TRIM_UNUSED_KSYMS which does a two-pass build and
unexports symbols which are not used in the current config [Nicolas
Pitre]
- several kbuild rule cleanups [Masahiro Yamada]
- warning option adjustments for gcov etc [Arnd Bergmann]
- a few more small fixes
* 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild: (31 commits)
kbuild: move -Wunused-const-variable to W=1 warning level
kbuild: fix if_change and friends to consider argument order
kbuild: fix adjust_autoksyms.sh for modules that need only one symbol
kbuild: fix ksym_dep_filter when multiple EXPORT_SYMBOL() on the same line
gcov: disable -Wmaybe-uninitialized warning
gcov: disable tree-loop-im to reduce stack usage
gcov: disable for COMPILE_TEST
Kbuild: disable 'maybe-uninitialized' warning for CONFIG_PROFILE_ALL_BRANCHES
Kbuild: change CC_OPTIMIZE_FOR_SIZE definition
kbuild: forbid kernel directory to contain spaces and colons
kbuild: adjust ksym_dep_filter for some cmd_* renames
kbuild: Fix dependencies for final vmlinux link
kbuild: better abstract vmlinux sequential prerequisites
kbuild: fix call to adjust_autoksyms.sh when output directory specified
kbuild: Get rid of KBUILD_STR
kbuild: rename cmd_as_s_S to cmd_cpp_s_S
kbuild: rename cmd_cc_i_c to cmd_cpp_i_c
kbuild: drop redundant "PHONY += FORCE"
kbuild: delete unnecessary "@:"
kbuild: mark help target as PHONY
...
