The kbuild system takes advantage of an incorrect behavior in GNU make.
Once this behavior is fixed, all files in the kernel rebuild every time,
even if nothing has changed.  This patch ensures kbuild works with both
the incorrect and correct behaviors of GNU make.

For more details on the incorrect behavior, see:

http://lists.gnu.org/archive/html/bug-make/2006-03/msg00003.html

Changes in this patch:
  - Keep all targets that are to be marked .PHONY in a variable, PHONY.
  - Add .PHONY: $(PHONY) to mark them properly.
  - Remove any $(PHONY) files from the $? list when determining whether
    targets are up-to-date or not.
Signed-off-by: NPaul Smith <psmith@gnu.org>
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

Warning now looks like this:
WARNING: vmlinux: 'strcpy' exported twice. Previous export was in vmlinux

Which gives much better hint how to fix it.
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

Added a dependency so we do full preparation before trying to build single
file targets. This fixes a case where Andrew Morton did:
	make kernel/sched.o
        rm include/asm
	make kernel/sched.o     -> splat
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

When searching for symbols the only check performed was if
offset equals st_value. Adding an additional check to see if st_name
points t a valid name made us sort out a few more false positives and
let us report more correct names in warnings.
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

Parameters to strstr() was reversed.
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

Building an allmodconfig kernel for ppc64 revealed a number of false
positives - originally reported by Andrew Morton.
This patch removes most if not all false positives for ppc64:

Section .opd
The .opd section contains function descriptors at least for ppc64.
So ignore it for .init.text (was ignored for .exit.text).
See description of function descriptors here:
http://www.linuxbase.org/spec/ELF/ppc64/PPC-elf64abi-1.7.html

Section .toc1
ppc64 places some static variables in .toc1 - ignore the.

Section __bug_tabe
BUG() and friends uses __bug_table. Ignore warnings from that section.

Module parameters are placed in .data.rel for ppc64, for adjust pattern to
match on section named .data*

Tested with gcc: 3.4.0 and binutils 2.15.90.0.3
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

'allnoconfig' is described by 'make help' as a "minimal config", that's not
strictly correct. To be pedantic, a minimal config would be one where
EMBEDDED was set to Y and most things therein disabled etc. Simply
answering 'no' to all options does not give a minimal config.
A better description of allnoconfig is that it answers all options with 'no'.

This patch updates the description.
Signed-off-by: NJesper Juhl <jesper.juhl@gmail.com>
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

Using the fixed path to /usr/bin/{nm,objdump} does not allow
CROSS_COMPILE environments to use namespace.pl. This patch causes
namespace.pl to use $NM and $OBJDUMP if defined or fall back to the nm
and objdump found in the path.
Signed-off-by: NAaron Brooks <aaron.brooks@sicortex.com>
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

In several cases the section mismatch check triggered false warnings.
Following patch introduce a whitelist to 'false positives' are not warned of.
Two types of patterns are recognised:
1) Typical case when a module parameter is _initdata
2) When a function pointer is assigned to a driver structure

In both patterns we rely on the actual name of the variable assigned
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

With following patch we now ignore all generated files for
make allmodconfig for x86_64.
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

It seems popular to protect your work with copyright, so I decided to do
so for modpost which I patch a great deal atm.
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

Rebuilding a previously built tree while using make's -j options from time to
time results in the version.h check running at the same time as the updating
of .kernelrelease, resulting in UTS_RELEASE remaining an empty string (and as
a side effect causing the entire kernel to be rebuilt).
Signed-Off-By: NJan Beulich <jbeulich@novell.com>
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

Andrew Morton reported a number of false positives for ia64 - like these:
WARNING: drivers/acpi/button.o - Section mismatch: reference to .init.text: from .IA_64.unwind.init.text after '' (at offset 0x0)
WARNING: drivers/acpi/button.o - Section mismatch: reference to .exit.text: from .IA_64.unwind.exit.text after '' (at offset 0x0)
WARNING: drivers/acpi/processor.o - Section mismatch: reference to .init.text: from .IA_64.unwind after '' (at offset 0x1e8)

They are all false positives - or at least the .c code looks OK.
It is not known why sometimes a section name is appended and sometimes not.

Fix is to accept references from all sections that includes "unwind." in the name.
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

The kernel now requires that CC be 3.1.0 or higher.  But we shouldn't place
that requirement upon HOSTCC unless we really need to.  Fixes my ia64 problem.
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

Workaround a cscope bug where a trailing ':' in VPATH makes it segfault
and let it build the cross-reference succesfully.

VPATH=/home/mattia/devel/kernel/git/linux-2.6: cscope -b
[1]    17555 segmentation fault VPATH=/home/mattia/devel/kernel/git/linux-2.6: cscope -b
Signed-off-by: NMattia Dongili <malattia@linux.it>
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

Try to look up the symbol that is referenced. Include the symbol
name in the warning message.
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

Do not try to look up section name until we know it is not a special
section. Otherwise we will address outside legal space and segfault.
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

A combination of calling modpost with option -a and MODVERDIR undefined
caused segmentation fault. So provide a default value and accept the
error messages it generates instead.
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

Noted by Olaf Hering <olh@suse.de>
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

checkconfig.pl is no longer needed now that autoconf.h is automatically
included.  Remove it and all references to it.
Signed-off-by: NBrian Gerst <bgerst@didntduck.org>
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

Emacs warns if an otherwise empty line starts with a tab.
Signed-off-by: NAdrian Bunk <bunk@stusta.de>
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

With the current way of generating the Makefile in the output directory
for builds outside of the source tree, specifying real targets (rather
than phony ones) doesn't work in an already (partially) built tree, as
the stub Makefile doesn't have any dependency information available.
Thus, all targets where files may actually exist must be listed
explicitly and, due to what I'd call a make misbehavior, directory
targets must then also be special cased.
Signed-Off-By: NJan Beulich <jbeulich@novell.com>
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

While the recent change to also escape # symbols when storing C-file
compilation command lines was helpful, it should be in effect for all
command lines, as much as the dollar escaping should be in effect for
C-source compilation commands. Additionally, for better readability and
maintenance, consolidating all the escaping (single quotes, dollars,
and now sharps) was also desirable.
Signed-Off-By: NJan Beulich <jbeulich@novell.com>
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

Move $(CC) support functions to Kbuild.include so they are available
in the kbuild files.
In addition the following was done:
	o as-option documented in Documentation/kbuild/makefiles.txt
	o Moved documentation to new section to match
	  new scope of functions
	o added cc-ifversion used to conditionally select a text string
	  dependent on actual $(CC) version
	o documented cc-ifversion
	o change so Kbuild.include is read before the kbuild file
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

Section mismatch is identified as references to .init*
sections from non .init sections. And likewise references
to .exit.* sections outside .exit sections.

.init.* sections are discarded after a module is initialized
and references to .init.* sections are oops candidates.
.exit.* sections are discarded when a module is built-in and
thus references to .exit are also oops candidates.

The checks were possible to do using 'make buildcheck' which
called the two perl scripts: reference_discarded.pl and
reference_init.pl. This patch just moves the same functionality
inside modpost and the scripts are then obsoleted.
They will though be kept for a while so users can do double
checks - but note that some .o files are skipped by the perl scripts
so result is not 1:1.
All credit for the concept goes to Keith Owens who implemented
the original perl scrips - this patch just moves it to modpost.

Compared to the perl script the implmentation in modpost will be run
for each kernel build - thus catching the error much sooner, but
the downside is that the individual .o file are not always identified.
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

Following patch enables depmod support when installing external modules.
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

To avoid stale modules located in $(MODVERDIR) aka .tmp_versions/
always delete the directory when building an external module.
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

uname -m on MIPS can give a number of results, such as mips64.  We
need to add another substitution to the sed call for SUBARCH in the
main Makefile.
Signed-off-by: NMartin Michlmayr <tbm@cyrius.com>
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

This matches the fix for a bug seen on x86-64.  Test booted on old hardware
that had 32 byte cachelines to begin with.
Signed-off-by: NZach Brown <zach.brown@oracle.com>
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

In modpost introduce a check for symbols exported twice.
This check caught only one victim (inet_bind_bucket_create) for
which a patch is already sent to netdev.
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

With following patch a second option is enabled to obtain
symbol information from a second external module when a
external module is build.
The recommended approach is to use a common kbuild file but
that may be impractical in certain cases.
With this patch one can copy over a Module.symvers from one
external module to make symbols (and symbol versions) available
for another external module.

Updated documentation in Documentation/kbuild/modules.txt
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

Just some light CodingStyle updates - no functional changes.
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

modpost.c provides warn() and fatal() - so use them all over the place.
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

Support building individual files when dealing with separate modules.
So say you have a module named "foo" which consist of two .o files bar.o
and fun.o.

You can then do:
make -C $KERNELSRC M=`pwd` bar.o
make -C $KERNELSRC M=`pwd` bar.lst
make -C $KERNELSRC M=`pwd` bar.i
make -C $KERNELSRC M=`pwd` /            <= will build all .o files
                                           and link foo.o
make -C $KERNELSRC M=`pwd` foo.ko       <= will build the module
                                           and do the modpost step
					   to create foo.ko

The above will also work if the external module is placed in a
subdirectory using a hirachy of kbuild files.
Thanks to Andreas Gruenbacher <agruen@suse.de> for initial feature
request / bug report.
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

acpi_rs_get_list_length() needs to account for all the vendor-defined data
bytes.  Failing to include these causes buffers to be sized too small,
which causes slab corruption when we later convert AML to resources and run
off the end of the buffer.

This causes slab corruption on machines that use ACPI vendor-defined
resources.  All HP ia64 machines do, and I'm told that some NEC machines
may as well.
Signed-off-by: NBjorn Helgaas <bjorn.helgaas@hp.com>
Cc: "Brown, Len" <len.brown@intel.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

Make sure maxnodes is safe size before calculating nlongs in
get_nodes().
Signed-off-by: NChris Wright <chrisw@sous-sol.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

I got all of these backwards.  We want to return

	min(input timeout, new timeout)

to userspace to prevent increasing the time-remaining value.

Thanks to Ernst Herzberg <earny@net4u.de> for reporting and diagnosing.
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

One of the parameters to the __pud_free_tlb() macro for powerpc is
incorrect (see patch) .  We get away with it by accident, because the one
place the macro is called, the second parameter is a variable named "pud".
Signed-off-by: NDavid Gibson <dwg@au1.ibm.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>