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  1. 21 1月, 2011 1 次提交
    • D
      kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT · 6a108a14
      由 David Rientjes 提交于 
      The meaning of CONFIG_EMBEDDED has long since been obsoleted; the option
is used to configure any non-standard kernel with a much larger scope than
only small devices.

This patch renames the option to CONFIG_EXPERT in init/Kconfig and fixes
references to the option throughout the kernel.  A new CONFIG_EMBEDDED
option is added that automatically selects CONFIG_EXPERT when enabled and
can be used in the future to isolate options that should only be
considered for embedded systems (RISC architectures, SLOB, etc).

Calling the option "EXPERT" more accurately represents its intention: only
expert users who understand the impact of the configuration changes they
are making should enable it.
Reviewed-by: NIngo Molnar <mingo@elte.hu>
Acked-by: NDavid Woodhouse <david.woodhouse@intel.com>
Signed-off-by: NDavid Rientjes <rientjes@google.com>
Cc: Greg KH <gregkh@suse.de>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Robin Holt <holt@sgi.com>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      6a108a14
  3. 14 1月, 2011 5 次提交
  5. 25 11月, 2010 1 次提交
    • W
      uml: disable winch irq before freeing handler data · 69e83dad
      由 Will Newton 提交于 
      Disable the winch irq early to make sure we don't take an interrupt part
way through the freeing of the handler data, resulting in a crash on
shutdown:

  winch_interrupt : read failed, errno = 9
  fd 13 is losing SIGWINCH support
  ------------[ cut here ]------------
  WARNING: at lib/list_debug.c:48 list_del+0xc6/0x100()
  list_del corruption, next is LIST_POISON1 (00100100)
  082578c8:  [<081fd77f>] dump_stack+0x22/0x24
  082578e0:  [<0807a18a>] warn_slowpath_common+0x5a/0x80
  08257908:  [<0807a23e>] warn_slowpath_fmt+0x2e/0x30
  08257920:  [<08172196>] list_del+0xc6/0x100
  08257940:  [<08060244>] free_winch+0x14/0x80
  08257958:  [<080606fb>] winch_interrupt+0xdb/0xe0
  08257978:  [<080a65b5>] handle_IRQ_event+0x35/0xe0
  08257998:  [<080a8717>] handle_edge_irq+0xb7/0x170
  082579bc:  [<08059bc4>] do_IRQ+0x34/0x50
  082579d4:  [<08059e1b>] sigio_handler+0x5b/0x80
  082579ec:  [<0806a374>] sig_handler_common+0x44/0xb0
  08257a68:  [<0806a538>] sig_handler+0x38/0x50
  08257a78:  [<0806a77c>] handle_signal+0x5c/0xa0
  08257a9c:  [<0806be28>] hard_handler+0x18/0x20
  08257aac:  [<00c14400>] 0xc14400
Signed-off-by: NWill Newton <will.newton@gmail.com>
Acked-by: NWANG Cong <xiyou.wangcong@gmail.com>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: <stable@kernel.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      69e83dad
  7. 18 11月, 2010 1 次提交
  9. 12 11月, 2010 1 次提交
  11. 28 10月, 2010 2 次提交
  13. 27 10月, 2010 7 次提交
  15. 19 10月, 2010 1 次提交
    • A
      uml: kill big kernel lock · 9a181c58
      由 Arnd Bergmann 提交于 
      Three uml device drivers still use the big kernel lock,
but all of them can be safely converted to using
a per-driver mutex instead. Most likely this is not
even necessary, so after further review these can
and should be removed as well.

The exec system call no longer requires the BKL either,
so remove it from there, too.
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: user-mode-linux-devel@lists.sourceforge.net
      9a181c58
  17. 16 10月, 2010 1 次提交
    • F
      uml: fix build · e3c6cf61
      由 FUJITA Tomonori 提交于 
      Fix a build error introduced by d6d1b650 ("param: simple
locking for sysfs-writable charp parameters").

    CC      arch/um/kernel/trap.o
  arch/um/drivers/hostaudio_kern.c: In function 'hostaudio_open':
  arch/um/drivers/hostaudio_kern.c:204: error: '__param_dsp' undeclared (first use in this function)
  arch/um/drivers/hostaudio_kern.c:204: error: (Each undeclared identifier is reported only once
  arch/um/drivers/hostaudio_kern.c:204: error: for each function it appears in.)
  arch/um/drivers/hostaudio_kern.c: In function 'hostmixer_open_mixdev':
  arch/um/drivers/hostaudio_kern.c:265: error: '__param_mixer' undeclared (first use in this function)
  arch/um/drivers/hostaudio_kern.c:272: error: '__param_dsp' undeclared (first use in this function)
Reported-by: NToralf Förster <toralf.foerster@gmx.de>
Tested-by: NToralf Förster <toralf.foerster@gmx.de>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Takashi Iwai <tiwai@suse.de>
Cc: Jeff Dike <jdike@addtoit.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      e3c6cf61
  19. 15 10月, 2010 2 次提交
    • A
      llseek: automatically add .llseek fop · 6038f373
      由 Arnd Bergmann 提交于 
      All file_operations should get a .llseek operation so we can make
nonseekable_open the default for future file operations without a
.llseek pointer.

The three cases that we can automatically detect are no_llseek, seq_lseek
and default_llseek. For cases where we can we can automatically prove that
the file offset is always ignored, we use noop_llseek, which maintains
the current behavior of not returning an error from a seek.

New drivers should normally not use noop_llseek but instead use no_llseek
and call nonseekable_open at open time.  Existing drivers can be converted
to do the same when the maintainer knows for certain that no user code
relies on calling seek on the device file.

The generated code is often incorrectly indented and right now contains
comments that clarify for each added line why a specific variant was
chosen. In the version that gets submitted upstream, the comments will
be gone and I will manually fix the indentation, because there does not
seem to be a way to do that using coccinelle.

Some amount of new code is currently sitting in linux-next that should get
the same modifications, which I will do at the end of the merge window.

Many thanks to Julia Lawall for helping me learn to write a semantic
patch that does all this.

===== begin semantic patch =====
// This adds an llseek= method to all file operations,
// as a preparation for making no_llseek the default.
//
// The rules are
// - use no_llseek explicitly if we do nonseekable_open
// - use seq_lseek for sequential files
// - use default_llseek if we know we access f_pos
// - use noop_llseek if we know we don't access f_pos,
//   but we still want to allow users to call lseek
//
@ open1 exists @
identifier nested_open;
@@
nested_open(...)
{
<+...
nonseekable_open(...)
...+>
}

@ open exists@
identifier open_f;
identifier i, f;
identifier open1.nested_open;
@@
int open_f(struct inode *i, struct file *f)
{
<+...
(
nonseekable_open(...)
|
nested_open(...)
)
...+>
}

@ read disable optional_qualifier exists @
identifier read_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
expression E;
identifier func;
@@
ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off)
{
<+...
(
   *off = E
|
   *off += E
|
   func(..., off, ...)
|
   E = *off
)
...+>
}

@ read_no_fpos disable optional_qualifier exists @
identifier read_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
@@
ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off)
{
... when != off
}

@ write @
identifier write_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
expression E;
identifier func;
@@
ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off)
{
<+...
(
  *off = E
|
  *off += E
|
  func(..., off, ...)
|
  E = *off
)
...+>
}

@ write_no_fpos @
identifier write_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
@@
ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off)
{
... when != off
}

@ fops0 @
identifier fops;
@@
struct file_operations fops = {
 ...
};

@ has_llseek depends on fops0 @
identifier fops0.fops;
identifier llseek_f;
@@
struct file_operations fops = {
...
 .llseek = llseek_f,
...
};

@ has_read depends on fops0 @
identifier fops0.fops;
identifier read_f;
@@
struct file_operations fops = {
...
 .read = read_f,
...
};

@ has_write depends on fops0 @
identifier fops0.fops;
identifier write_f;
@@
struct file_operations fops = {
...
 .write = write_f,
...
};

@ has_open depends on fops0 @
identifier fops0.fops;
identifier open_f;
@@
struct file_operations fops = {
...
 .open = open_f,
...
};

// use no_llseek if we call nonseekable_open
////////////////////////////////////////////
@ nonseekable1 depends on !has_llseek && has_open @
identifier fops0.fops;
identifier nso ~= "nonseekable_open";
@@
struct file_operations fops = {
...  .open = nso, ...
+.llseek = no_llseek, /* nonseekable */
};

@ nonseekable2 depends on !has_llseek @
identifier fops0.fops;
identifier open.open_f;
@@
struct file_operations fops = {
...  .open = open_f, ...
+.llseek = no_llseek, /* open uses nonseekable */
};

// use seq_lseek for sequential files
/////////////////////////////////////
@ seq depends on !has_llseek @
identifier fops0.fops;
identifier sr ~= "seq_read";
@@
struct file_operations fops = {
...  .read = sr, ...
+.llseek = seq_lseek, /* we have seq_read */
};

// use default_llseek if there is a readdir
///////////////////////////////////////////
@ fops1 depends on !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier readdir_e;
@@
// any other fop is used that changes pos
struct file_operations fops = {
... .readdir = readdir_e, ...
+.llseek = default_llseek, /* readdir is present */
};

// use default_llseek if at least one of read/write touches f_pos
/////////////////////////////////////////////////////////////////
@ fops2 depends on !fops1 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read.read_f;
@@
// read fops use offset
struct file_operations fops = {
... .read = read_f, ...
+.llseek = default_llseek, /* read accesses f_pos */
};

@ fops3 depends on !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier write.write_f;
@@
// write fops use offset
struct file_operations fops = {
... .write = write_f, ...
+	.llseek = default_llseek, /* write accesses f_pos */
};

// Use noop_llseek if neither read nor write accesses f_pos
///////////////////////////////////////////////////////////

@ fops4 depends on !fops1 && !fops2 && !fops3 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read_no_fpos.read_f;
identifier write_no_fpos.write_f;
@@
// write fops use offset
struct file_operations fops = {
...
 .write = write_f,
 .read = read_f,
...
+.llseek = noop_llseek, /* read and write both use no f_pos */
};

@ depends on has_write && !has_read && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier write_no_fpos.write_f;
@@
struct file_operations fops = {
... .write = write_f, ...
+.llseek = noop_llseek, /* write uses no f_pos */
};

@ depends on has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read_no_fpos.read_f;
@@
struct file_operations fops = {
... .read = read_f, ...
+.llseek = noop_llseek, /* read uses no f_pos */
};

@ depends on !has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
@@
struct file_operations fops = {
...
+.llseek = noop_llseek, /* no read or write fn */
};
===== End semantic patch =====
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Cc: Julia Lawall <julia@diku.dk>
Cc: Christoph Hellwig <hch@infradead.org>
      6038f373
    • T
      ubd: fix incorrect sector handling during request restart · 47526903
      由 Tejun Heo 提交于 
      Commit f81f2f7c (ubd: drop unnecessary rq->sector manipulation)
dropped request->sector manipulation in preparation for global request
handling cleanup; unfortunately, it incorrectly assumed that the
updated sector wasn't being used.

ubd tries to issue as many requests as possible to io_thread.  When
issuing fails due to memory pressure or other reasons, the device is
put on the restart list and issuing stops.  On IO completion, devices
on the restart list are scanned and IO issuing is restarted.

ubd issues IOs sg-by-sg and issuing can be stopped in the middle of a
request, so each device on the restart queue needs to remember where
to restart in its current request.  ubd needs to keep track of the
issue position itself because,

* blk_rq_pos(req) is now updated by the block layer to keep track of
  _completion_ position.

* Multiple io_req's for the current request may be in flight, so it's
  difficult to tell where blk_rq_pos(req) currently is.

Add ubd->rq_pos to keep track of the issue position and use it to
correctly restart io_req issue.
Signed-off-by: NTejun Heo <tj@kernel.org>
Reported-by: NRichard Weinberger <richard@nod.at>
Tested-by: NRichard Weinberger <richard@nod.at>
Tested-by: NChris Frey <cdfrey@foursquare.net>
Cc: stable@kernel.org
Signed-off-by: NJens Axboe <jaxboe@fusionio.com>
      47526903
  21. 30 9月, 2010 1 次提交
    • B
      um: Proper Fix for f25c80a4: remove duplicate structure field initialization · 9337057d
      由 Boaz Harrosh 提交于 
      uml_net_set_mac() was broken and luckily it was never used, before.
What it was trying to do is spin_lock before memcopy the mac address.
Linus attempted to fix it in assumption that someone decided the
lock was needed. But since it was never ever used at all, and was
just dead code, I think we can assume that it is not needed, after
all.

On the other hand patch [f25c80a4] was trying to use eth_mac_addr()
in eth_configure(), *which was the real fallout*. Because of state
checks done inside eth_mac_addr() the address was never set. I have
not reintroduced the memcpy wrapper, but I've put a comment for future
cats.

The code now is back to exactly as it was before [f25c80a4]. With
the cleanup applied. If the spin_lock is indeed needed then a contender
should supply a test case that fails, then fix it with the proper
locking, as a separate unrelated patch.

CC: Julia Lawall <julia@diku.dk>
CC: David S. Miller <davem@davemloft.net>
CC: Andrew Morton <akpm@linux-foundation.org>
CC: Al Viro <viro@ZenIV.linux.org.uk>
Tested-by: NBoaz Harrosh <bharrosh@panasas.com>
Signed-off-by: NBoaz Harrosh <bharrosh@panasas.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      9337057d
  23. 24 9月, 2010 1 次提交
  25. 23 9月, 2010 1 次提交
  27. 20 9月, 2010 1 次提交
  29. 21 8月, 2010 2 次提交
  31. 18 8月, 2010 1 次提交
    • D
      Make do_execve() take a const filename pointer · d7627467
      由 David Howells 提交于 
      Make do_execve() take a const filename pointer so that kernel_execve() compiles
correctly on ARM:

arch/arm/kernel/sys_arm.c:88: warning: passing argument 1 of 'do_execve' discards qualifiers from pointer target type

This also requires the argv and envp arguments to be consted twice, once for
the pointer array and once for the strings the array points to.  This is
because do_execve() passes a pointer to the filename (now const) to
copy_strings_kernel().  A simpler alternative would be to cast the filename
pointer in do_execve() when it's passed to copy_strings_kernel().

do_execve() may not change any of the strings it is passed as part of the argv
or envp lists as they are some of them in .rodata, so marking these strings as
const should be fine.

Further kernel_execve() and sys_execve() need to be changed to match.

This has been test built on x86_64, frv, arm and mips.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Tested-by: NRalf Baechle <ralf@linux-mips.org>
Acked-by: NRussell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      d7627467
  33. 14 8月, 2010 1 次提交
  35. 11 8月, 2010 2 次提交
  37. 10 8月, 2010 3 次提交
    • C
      arch/um/kernel/ptrace.c: remove dead PROC_MM · 7833e7c9
      由 Christoph Egger 提交于 
      PROC_MM doesn't exist in Kconfig.  Looking around it looks like a
left-over from 2.6.0 or even 2.4 times, last mentioned in a fedora patch
for 2.6.10.  I believe it's time to get rid of that last tiny parts here
that are still around.
Signed-off-by: NChristoph Egger <siccegge@cs.fau.de>
Cc: Jeff Dike <jdike@addtoit.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      7833e7c9
    • R
      um: call free_irq() only on enabled channels · 47562277
      由 Richard Weinberger 提交于 
      When I use OpenSUSE-11.2 on UML (> 2.6.25)
I get lots of such errors:

Registering fd 1 twice
Irqs : 3, 3
Ids : 0x09cb41a0, 0x09cb4120
------------[ cut here ]------------
WARNING: at kernel/irq/manage.c:896 __free_irq+0x79/0x11a()
Trying to free already-free IRQ 3
Modules linked in:
09dadc6c:  [<081b2edb>] dump_stack+0x1c/0x20
09dadc84:  [<080716da>] warn_slowpath_common+0x49/0x77
09dadc9c:  [<08071772>] warn_slowpath_fmt+0x26/0x2a
09dadcb4:  [<08094e08>] __free_irq+0x79/0x11a
09dadce4:  [<08094ed6>] free_irq+0x2d/0x49
09dadcf4:  [<0805b4bc>] close_one_chan+0x70/0x9c
09dadd0c:  [<0805b833>] close_chan+0x17/0x22
09dadd1c:  [<0805bdda>] enable_chan+0x70/0x7c
09dadd3c:  [<0805cbb7>] line_open+0x34/0x9f
09dadd54:  [<0805b21e>] con_open+0x13/0x35
09dadd6c:  [<0814dc89>] tty_open+0x285/0x384
09dadda0:  [<080b754e>] chrdev_open+0xe0/0xf9
09daddc0:  [<080b3fb2>] __dentry_open+0xf3/0x1e2
09dadde4:  [<080b4142>] nameidata_to_filp+0x35/0x49
09daddfc:  [<080bd270>] do_last+0x409/0x50e
09dade28:  [<080bea04>] do_filp_open+0x175/0x446
09dadecc:  [<080b3d89>] do_sys_open+0x4a/0x128
09dadf04:  [<080b3ea2>] sys_open+0x19/0x21
09dadf28:  [<0805ab5a>] handle_syscall+0x7a/0x98
09dadf78:  [<08068441>] userspace+0x2c9/0x370
09dadfe0:  [<08058bb3>] fork_handler+0x53/0x5b
09dadffc:  [<00766564>] 0x766564

---[ end trace 9ebc1094aaf4bded ]---

This patch fixes the issue.
Signed-off-by: NRichard Weinberger <richard@nod.at>
Cc: Jeff Dike <jdike@addtoit.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      47562277
    • A
      Deal with missing exports for hostfs · 005a59ec
      由 Al Viro 提交于 
      Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      005a59ec
  39. 08 8月, 2010 1 次提交
    • A
      block: push down BKL into .open and .release · 6e9624b8
      由 Arnd Bergmann 提交于 
      The open and release block_device_operations are currently
called with the BKL held. In order to change that, we must
first make sure that all drivers that currently rely
on this have no regressions.

This blindly pushes the BKL into all .open and .release
operations for all block drivers to prepare for the
next step. The drivers can subsequently replace the BKL
with their own locks or remove it completely when it can
be shown that it is not needed.

The functions blkdev_get and blkdev_put are the only
remaining users of the big kernel lock in the block
layer, besides a few uses in the ioctl code, none
of which need to serialize with blkdev_{get,put}.

Most of these two functions is also under the protection
of bdev->bd_mutex, including the actual calls to
->open and ->release, and the common code does not
access any global data structures that need the BKL.
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Acked-by: NChristoph Hellwig <hch@infradead.org>
Signed-off-by: NJens Axboe <jaxboe@fusionio.com>
      6e9624b8
  41. 04 8月, 2010 1 次提交
  43. 03 8月, 2010 1 次提交
    • H
      um, x86: Cast to (u64 *) inside set_64bit() · bf676945
      由 H. Peter Anvin 提交于 
      After tightening up the types passed to set_64bit(), the cast to
(phys_t *) triggers a warning apparently because phys_t is defined as
"unsigned long" when building on 64 bits; however, u64 is defined as
"unsigned long long".  This is, however, a explicit cast inside a
size-specific call, so just make the cast explicitly (u64 *).
Signed-off-by: NH. Peter Anvin <hpa@zytor.com>
Cc: Jeff Dike <jdike@addtoit.com>
LKML-Reference: <tip-69309a05@git.kernel.org>
      bf676945
  45. 27 7月, 2010 2 次提交