Miklos Szeredi [Tue, 5 Nov 2013 05:57:07 +0000 (16:57 +1100)]
autofs4: translate pids to the right namespace for the daemon
The PID and the TGID of the process triggering the mount are sent to the
daemon. Currently the global pid values are sent (ones valid in the
initial pid namespace) but this is wrong if the autofs daemon itself is
not running in the initial pid namespace.
So send the pid values that are valid in the namespace of the autofs daemon.
The namespace to use is taken from the oz_pgrp pid pointer, which was set
at mount time to the mounting process' pid namespace.
If the pid translation fails (the triggering process is in an unrelated
pid namespace) then the automount fails with ENOENT.
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Acked-by: Serge Hallyn <serge.hallyn@canonical.com> Cc: Eric Biederman <ebiederm@xmission.com> Cc: Ian Kent <raven@themaw.net> Cc: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
autofs4: allow autofs to work outside the initial PID namespace
Enable autofs4 to work in a "container". oz_pgrp is converted from pid_t
to struct pid and this is stored at mount time based on the "pgrp=" option
or if the option is missing then the current pgrp.
The "pgrp=" option is interpreted in the PID namespace of the current
process. This option is flawed in that it doesn't carry the namespace
information, so it should be deprecated. AFAICS the autofs daemon always
sends the current pgrp, which is the default anyway.
The oz_pgrp is also set from the AUTOFS_DEV_IOCTL_SETPIPEFD_CMD ioctl.
This ioctl sets oz_pgrp to the current pgrp. It is not allowed to change
the pid namespace.
oz_pgrp is used mainly to determine whether the process traversing the
autofs mount tree is the autofs daemon itself or not. This function now
compares the pid pointers instead of the pid_t values.
One other use of oz_pgrp is in autofs4_show_options. There is shows the
virtual pid number (i.e. the one that is valid inside the PID namespace
of the calling process)
For debugging printk convert oz_pgrp to the value in the initial pid
namespace.
Signed-off-by: Sukadev Bhattiprolu <sukadev@us.ibm.com> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Acked-by: Serge Hallyn <serge.hallyn@canonical.com> Cc: Eric Biederman <ebiederm@xmission.com> Cc: Ian Kent <raven@themaw.net> Cc: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
I've patched 'gen_initramfs_list.sh' script to check if a selected
compression command is accessible or not; And fall-back to the default
gzip(1) format when it is not. usr/Makefile also defaults to '.gz' format
when all are enabled.
Signed-off-by: P J P <prasad@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
P J P [Tue, 5 Nov 2013 05:57:04 +0000 (16:57 +1100)]
initramfs: read CONFIG_RD_ variables for initramfs compression
When expert configuration option(CONFIG_EXPERT) is enabled, menuconfig
offers a choice of compression algorithm to compress initial ramfs image;
This choice is stored into CONFIG_RD_* variables. But usr/Makefile uses
earlier INITRAMFS_COMPRESSION_* macros to build initial ramfs file. Since
none of them is defined, resulting 'initramfs_data.cpio' file remains
un-compressed.
This patch updates the Makefile to use CONFIG_RD_* variables and adds
support for LZ4 compression algorithm. Also updates the
'gen_initramfs_list.sh' script to check whether a selected compression
command is accessible or not. And fall-back to default gzip(1)
compression when it is not.
Signed-off-by: P J P <prasad@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This patch proposes to make init failures more explicit.
Before this, the "No init found" message didn't help much. It could
sometimes be misleading and actually mean "No *working* init found".
This message could hide many different issues:
- no init program candidates found at all
- some init program candidates exist but can't be executed
(missing execute permissions, failed to load shared libraries,
executable compiled for an unknown architecture...)
This patch notifies the kernel user when a candidate init program is found
but can't be executed. In each failure situation, the error code is
displayed, to quickly find the root cause. "No init found" is also
replaced by "No working init found", which is more correct.
This will help embedded Linux developers (especially the newcomers),
regularly making and debugging new root filesystems.
Credits to Geert Uytterhoeven and Janne Karhunen for their improvement
suggestions.
Signed-off-by: Michael Opdenacker <michael.opdenacker@free-electrons.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Tested-by: Janne Karhunen <Janne.Karhunen@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
P J P [Tue, 5 Nov 2013 05:57:02 +0000 (16:57 +1100)]
init/do_mounts_rd.c: fix NULL pointer dereference while loading initramfs
Make menuconfig allows one to choose compression format of an initial
ramdisk image. But this choice does not result in duly compressed initial
ramdisk image. Because - $ make install - does not pass on the selected
compression choice to the dracut(8) tool, which creates the initramfs
file. dracut(8) generates the image with the default compression, ie.
gzip(1).
If a user chose any other compression instead of gzip(1), it leads to a
crash due to NULL pointer dereference in crd_load(), caused by a NULL
function pointer returned by the 'decompress_method()' routine. Because
the initramfs image is gzip(1) compressed, whereas the kernel knows only
to decompress the chosen format and not gzip(1).
This patch replaces the crash by an explicit panic() call with an
appropriate error message. This shall prevent the kernel from
eventually panicking in: init/do_mounts.c: mount_block_root() with
-> panic("VFS: Unable to mount root fs on %s", b);
Signed-off-by: P J P <prasad@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
We observed this problem has been occurring since 2.6.30 with
fs/binfmt_elf.c: create_elf_tables()->get_random_bytes(), introduced by f06295b44c296c8f ("ELF: implement AT_RANDOM for glibc PRNG seeding").
/*
* Generate 16 random bytes for userspace PRNG seeding.
*/
get_random_bytes(k_rand_bytes, sizeof(k_rand_bytes));
The patch introduces a wrapper around get_random_int() which has lower
overhead than calling get_random_bytes() directly.
With this patch applied:
$ cat /proc/sys/kernel/random/entropy_avail
2731
$ cat /proc/sys/kernel/random/entropy_avail
2802
$ cat /proc/sys/kernel/random/entropy_avail
2878
Analyzed by John Sobecki.
Signed-off-by: Jie Liu <jeff.liu@oracle.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Andreas Dilger <aedilger@gmail.com> Cc: Alan Cox <alan@linux.intel.com> Cc: Arnd Bergmann <arnn@arndb.de> Cc: John Sobecki <john.sobecki@oracle.com> Cc: James Morris <james.l.morris@oracle.com> Cc: Jakub Jelinek <jakub@redhat.com> Cc: Ted Ts'o <tytso@mit.edu> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Kees Cook <keescook@chromium.org> Cc: Ulrich Drepper <drepper@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
- use `bool' for boolean variables
- remove unneeded/undesirable cast of void*
- add missed ep_scan_ready_list() kerneldoc
Cc: "Paul E. McKenney" <paulmck@us.ibm.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Davide Libenzi <davidel@xmailserver.org> Cc: Eric Wong <normalperson@yhbt.net> Cc: Jason Baron <jbaron@akamai.com> Cc: Nathan Zimmer <nzimmer@sgi.com> Cc: Nelson Elhage <nelhage@nelhage.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Jason Baron [Tue, 5 Nov 2013 05:57:00 +0000 (16:57 +1100)]
epoll: do not take global 'epmutex' for simple topologies
When calling EPOLL_CTL_ADD for an epoll file descriptor that is attached
directly to a wakeup source, we do not need to take the global 'epmutex',
unless the epoll file descriptor is nested. The purpose of taking the
'epmutex' on add is to prevent complex topologies such as loops and deep
wakeup paths from forming in parallel through multiple EPOLL_CTL_ADD
operations. However, for the simple case of an epoll file descriptor
attached directly to a wakeup source (with no nesting), we do not need to
hold the 'epmutex'.
This patch along with 'epoll: optimize EPOLL_CTL_DEL using rcu' improves
scalability on larger systems. Quoting Nathan Zimmer's mail on SPECjbb
performance:
"On the 16 socket run the performance went from 35k jOPS to 125k jOPS. In
addition the benchmark when from scaling well on 10 sockets to scaling
well on just over 40 sockets.
...
Currently the benchmark stops scaling at around 40-44 sockets but it seems like
I found a second unrelated bottleneck."
Signed-off-by: Jason Baron <jbaron@akamai.com> Tested-by: Nathan Zimmer <nzimmer@sgi.com> Cc: Eric Wong <normalperson@yhbt.net> Cc: Nelson Elhage <nelhage@nelhage.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Davide Libenzi <davidel@xmailserver.org> Cc: "Paul E. McKenney" <paulmck@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Jason Baron [Tue, 5 Nov 2013 05:56:59 +0000 (16:56 +1100)]
epoll: remove the on_list check for 'struct epitem'
By removing the 'int on_list' field from 'struct epitem', we avoid hitting
the BUILD_BUG_ON() for 'struct epitem' being larger than 128 bytes.
In file included from include/linux/init.h:4:0,
from fs/eventpoll.c:14:
fs/eventpoll.c: In function 'eventpoll_init':
include/linux/compiler.h:321:20: error: call to '__compiletime_assert_2137' declared with attribute error: BUILD_BUG_ON failed: sizeof(void *) <= 8 && sizeof(struct epitem) > 128
prefix ## suffix(); \
The check to make sure that the 'struct epitem' was actually linked via
epi->fllink was added to avoid having the list removal primitives called
twice for the same 'struct epitem'. However, the double call possibility
was removed by 'Subject: epoll: optimize EPOLL_CTL_DEL using rcu'. There,
the call to 'list_del_init()' in eventpoll_release_file() was removed (we
now rely on the list delete happening entirely in 'ep_remove()', which is
called from eventpoll_release_file()).
There is also the question as to whether multiple ep_remove() calls could
happen concurrently. This can not happen since EPOLL_CTL_DEL can't race
with eventpoll_release_file() or ep_free() - it has to do an fget() to
proceed. Further, eventpoll_release_file() can not race with ep_free(),
since they both acquire the 'epmutex'.
Signed-off-by: Jason Baron <jbaron@akamai.com> Reported-by: Wu Fengguang <fengguang.wu@intel.com> Cc: Nathan Zimmer <nzimmer@sgi.com> Cc: Eric Wong <normalperson@yhbt.net> Cc: Nelson Elhage <nelhage@nelhage.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Davide Libenzi <davidel@xmailserver.org> Cc: "Paul E. McKenney" <paulmck@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Jason Baron [Tue, 5 Nov 2013 05:56:59 +0000 (16:56 +1100)]
epoll: optimize EPOLL_CTL_DEL using rcu
Nathan Zimmer found that once we get over 10+ cpus, the scalability of
SPECjbb falls over due to the contention on the global 'epmutex', which is
taken in on EPOLL_CTL_ADD and EPOLL_CTL_DEL operations.
Patch #1 removes the 'epmutex' lock completely from the EPOLL_CTL_DEL path
by using rcu to guard against any concurrent traversals.
Patch #2 remove the 'epmutex' lock from EPOLL_CTL_ADD operations for
simple topologies. IE when adding a link from an epoll file descriptor to
a wakeup source, where the epoll file descriptor is not nested.
This patch (of 2):
Optimize EPOLL_CTL_DEL such that it does not require the 'epmutex' by
converting the file->f_ep_links list into an rcu one. In this way, we can
traverse the epoll network on the add path in parallel with deletes.
Since deletes can't create loops or worse wakeup paths, this is safe.
This patch in combination with the patch "epoll: Do not take global 'epmutex'
for simple topologies", shows a dramatic performance improvement in
scalability for SPECjbb.
Signed-off-by: Jason Baron <jbaron@akamai.com> Tested-by: Nathan Zimmer <nzimmer@sgi.com> Cc: Eric Wong <normalperson@yhbt.net> Cc: Nelson Elhage <nelhage@nelhage.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Davide Libenzi <davidel@xmailserver.org> Cc: "Paul E. McKenney" <paulmck@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Joe Perches [Tue, 5 Nov 2013 05:56:57 +0000 (16:56 +1100)]
checkpatch: improve "return is not a function" test
Find a few more cases where parentheses are used around the value of a
return statement.
This now uses the "$balanced_parens" test and also makes the test depend
on perl v5.10 and higher.
This now finds return with parenthesis uses the old code did not find
like:
ERROR: return is not a function, parentheses are not required
#211: FILE: arch/m68k/include/asm/sun3xflop.h:211:
+ return ((error == 0) ? 0 : -1);
Signed-off-by: Joe Perches <joe@perches.com> Tested-by: David Cohen <david.a.cohen@linux.intel.com> Acked-by: David Cohen <david.a.cohen@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Josh Triplett [Tue, 5 Nov 2013 05:56:57 +0000 (16:56 +1100)]
checkpatch.pl: check for the FSF mailing address
Kernel maintainers reject new instances of the GPL boilerplate paragraph
directing people to write to the FSF for a copy of the GPL, since the FSF
has moved in the past and may do so again.
Make this an error for new code, but just a --strict CHK in --file mode;
anyone interested in doing tree-wide cleanups of this form can enable this
test explicitly.
Signed-off-by: Josh Triplett <josh@joshtriplett.org> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Joe Perches <joe@perches.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Joe Perches [Tue, 5 Nov 2013 05:56:56 +0000 (16:56 +1100)]
checkpatch: make the memory barrier test noisier
Peter Zijlstra prefers that comments be required near uses of memory
barriers.
Change the message level for memory barrier uses from a --strict test only
to a normal WARN so it's always emitted.
This might produce false positives around insertions of memory barriers
when a comment is outside the patch context block.
And checkpatch is still stupid, it only looks for existence of any
comment, not at the comment content.
Signed-off-by: Joe Perches <joe@perches.com> Suggested-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Oliver Neukum <oliver@neukum.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Joe Perches [Tue, 5 Nov 2013 05:56:55 +0000 (16:56 +1100)]
checkpatch: add test for #defines of ARCH_HAS_<foo>
Add a test for these #defines
Additionally, moved string_find_replace sub as it screws up subsequent
formatting when placed inside another sub.
Signed-off-by: Joe Perches <joe@perches.com> Suggested-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Joe Perches [Tue, 5 Nov 2013 05:56:53 +0000 (16:56 +1100)]
checkpatch: extend CamelCase types and ignore existing CamelCase uses in a patch
Extend the CamelCase words found to include structure members.
In https://lkml.org/lkml/2013/9/3/318 Sarah Sharp (mostly) wrote:
"In general, if checkpatch.pl complains about a variable a patch
introduces that's CamelCase, you should pay attention to it. Otherwise,
[] ignore it."
So, if checking a patch, scan the original patched file if it's available
and add any preexisting CamelCase types so reuses do not generate
CamelCase messages.
That also means Andrew's not so cruelly spurned anymore.
https://lkml.org/lkml/2013/2/22/426
Signed-off-by: Joe Perches <joe@perches.com> Suggested-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Suggested-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Joe Perches [Tue, 5 Nov 2013 05:56:53 +0000 (16:56 +1100)]
checkpatch: report missing spaces around trigraphs with --strict
Spaces around trigraphs are specified by CodingStyle but checkpatch is
currently silent about them because there are many current instances
without them.
Make missing spaces around trigraphs a --strict message.
Signed-off-by: Joe Perches <joe@perches.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Marian Chereji [Tue, 5 Nov 2013 05:56:52 +0000 (16:56 +1100)]
lib: Add CRC64 ECMA module
Add implementation of CRC64 ECMA checksum.
We have an IP Acceleration driver for Freescale network processors which
is using this CRC64. However, it still needs some work in order for it to
become upstreamable.
Signed-off-by: Marian Chereji <marian.chereji@freescale.com> Reviewed-by: Varvara Andrei-B21317 <andrei.varvara@freescale.com> Reviewed-by: Fleming Andrew-AFLEMING <AFLEMING@freescale.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Nicolin Chen [Tue, 5 Nov 2013 05:56:52 +0000 (16:56 +1100)]
sound/soc/pxa/mmp-pcm.c: use gen_pool_dma_alloc() to allocate dma buffer
Since gen_pool_dma_alloc() is introduced, we implement it to simplify code.
Signed-off-by: Nicolin Chen <b42378@freescale.com> Cc: Eric Miao <eric.y.miao@gmail.com> Cc: Russell King <linux@arm.linux.org.uk> Cc: Haojian Zhuang <haojian.zhuang@gmail.com> Cc: Liam Girdwood <lgirdwood@gmail.com> Cc: Mark Brown <broonie@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Nicolin Chen [Tue, 5 Nov 2013 05:56:50 +0000 (16:56 +1100)]
drivers/dma/mmp_tdma.c: use gen_pool_dma_alloc() to allocate descriptor
Since gen_pool_dma_alloc() is introduced, we implement it to simplify code.
Signed-off-by: Nicolin Chen <b42378@freescale.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Vinod Koul <vinod.koul@intel.com> Cc: Grant Likely <grant.likely@linaro.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Nicolin Chen [Tue, 5 Nov 2013 05:56:49 +0000 (16:56 +1100)]
arch/arm/mach-davinci/sram.c: use gen_pool_dma_alloc() to sram.c
Since gen_pool_dma_alloc() is introduced, we implement it to simplify code.
Signed-off-by: Nicolin Chen <b42378@freescale.com> Cc: Sekhar Nori <nsekhar@ti.com> Cc: Kevin Hilman <khilman@deeprootsystems.com> Cc: Russell King <linux@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Johan Hovold [Tue, 5 Nov 2013 05:56:43 +0000 (16:56 +1100)]
backlight: atmel-pwm-bl: clean up probe error handling
Clean up probe error handling by checking parameters before any
allocations and removing an obsolete error label. Also remove unnecessary
reset of private gpio number.
Signed-off-by: Johan Hovold <jhovold@gmail.com> Acked-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Johan Hovold [Tue, 5 Nov 2013 05:56:42 +0000 (16:56 +1100)]
backlight: atmel-pwm-bl: fix gpio polarity in remove
Make sure to honour gpio polarity also at remove so that the backlight is
actually disabled on boards with active-low enable pin.
Signed-off-by: Johan Hovold <jhovold@gmail.com> Acked-by: Jingoo Han <jg1.han@samsung.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Johan Hovold [Tue, 5 Nov 2013 05:56:41 +0000 (16:56 +1100)]
backlight: atmel-pwm-bl: fix reported brightness
The driver supports 16-bit brightness values, but the value returned
from get_brightness was truncated to eight bits.
Signed-off-by: Johan Hovold <jhovold@gmail.com> Cc: Jingoo Han <jg1.han@samsung.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Jingoo Han [Tue, 5 Nov 2013 05:56:21 +0000 (16:56 +1100)]
backlight: use dev_get_platdata()
Use the wrapper function for retrieving the platform data instead of
accessing dev->platform_data directly. This is a cosmetic change
to make the code simpler and enhance the readability.
Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Jingoo Han [Tue, 5 Nov 2013 05:56:19 +0000 (16:56 +1100)]
backlight: lm3639: Don't mix different enum types
Don't mix different enum types to fix the sparse warnings.
drivers/video/backlight/lm3639_bl.c:80:51: warning: mixing different enum types
drivers/video/backlight/lm3639_bl.c:80:51: int enum lm3639_fleds versus
drivers/video/backlight/lm3639_bl.c:80:51: int enum lm3639_bleds
drivers/video/backlight/lm3639_bl.c:82:51: warning: mixing different enum types
drivers/video/backlight/lm3639_bl.c:82:51: int enum lm3639_fleds versus
drivers/video/backlight/lm3639_bl.c:82:51: int enum lm3639_bleds
Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Dan Carpenter [Tue, 5 Nov 2013 05:56:18 +0000 (16:56 +1100)]
drivers/video/backlight/lm3630a_bl.c: potential NULL deref in probe()
We dereference "pdata" later in the function so we can't leave it as NULL.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Acked-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Dan Carpenter [Tue, 5 Nov 2013 05:56:17 +0000 (16:56 +1100)]
drivers/video/backlight/lm3630a_bl.c: fix signedness bug in lm3630a_chip_init()
"rval" needs to be signed for the error handling to work.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Acked-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
projects / karo-tx-linux.git / log