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  1. 27 4月, 2016 1 次提交
  3. 30 3月, 2016 2 次提交
    • N
      kbuild: add fine grained build dependencies for exported symbols · c1a95fda
      由 Nicolas Pitre 提交于 
      Like with kconfig options, we now have the ability to compile in and
out individual EXPORT_SYMBOL() declarations based on the content of
include/generated/autoksyms.h.  However we don't want the entire
world to be rebuilt whenever that file is touched.

Let's apply the same build dependency trick used for CONFIG_* symbols
where the time stamp of empty files whose paths matching those symbols
is used to trigger fine grained rebuilds. In our case the key is the
symbol name passed to EXPORT_SYMBOL().

However, unlike config options, we cannot just use fixdep to parse
the source code for EXPORT_SYMBOL(ksym) because several variants exist
and parsing them all in a separate tool, and keeping it in synch, is
not trivially maintainable.  Furthermore, there are variants such as

	EXPORT_SYMBOL_GPL(pci_user_read_config_##size);

that are instanciated via a macro for which we can't easily determine
the actual exported symbol name(s) short of actually running the
preprocessor on them.

Storing the symbol name string in a special ELF section doesn't work
for targets that output assembly or preprocessed source.

So the best way is really to leverage the preprocessor by having it
output actual symbol names anchored by a special sequence that can be
easily filtered out. Then the list of symbols is simply fed to fixdep
to be merged with the other dependencies.

That implies the preprocessor is executed twice for each source file.
A previous attempt relied on a warning pragma for each EXPORT_SYMBOL()
instance that was filtered apart from stderr by the build system with
a sed script during the actual compilation pass. Unfortunately the
preprocessor/compiler diagnostic output isn't stable between versions
and this solution, although more efficient, was deemed too fragile.

Because of the lowercasing performed by fixdep, there might be name
collisions triggering spurious rebuilds for similar symbols. But this
shouldn't be a big issue in practice. (This is the case for CONFIG_*
symbols and I didn't want to be different here, whatever the original
reason for doing so.)

To avoid needless build overhead, the exported symbol name gathering is
performed only when CONFIG_TRIM_UNUSED_KSYMS is selected.
Signed-off-by: NNicolas Pitre <nico@linaro.org>
Acked-by: NRusty Russell <rusty@rustcorp.com.au>
      c1a95fda
    • N
      kbuild: de-duplicate fixdep usage · e4aca459
      由 Nicolas Pitre 提交于 
      The generation and postprocessing of automatic dependency rules is
duplicated in rule_cc_o_c, rule_as_o_S and if_changed_dep. Since
this is not a trivial one-liner action, it is now abstracted under
cmd_and_fixdep to simplify things and make future changes in this area
easier.

In the rule_cc_o_c and rule_as_o_S cases that means the order of some
commands has been altered, namely fixdep and related file manipulations
are executed earlier, but they didn't depend on those commands that now
execute later.
Signed-off-by: NNicolas Pitre <nico@linaro.org>
      e4aca459
  5. 05 3月, 2016 1 次提交
    • M
      kbuild: suppress annoying "... is up to date." message · 2aedcd09
      由 Masahiro Yamada 提交于 
      Under certain conditions, Kbuild shows "... is up to date" where
if_changed or friends are used.

For example, the incremental build of ARM64 Linux shows this message
when the kernel image has not been updated.

  $ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu-
    CHK     include/config/kernel.release
    CHK     include/generated/uapi/linux/version.h
    CHK     include/generated/utsrelease.h
    CHK     include/generated/bounds.h
    CHK     include/generated/timeconst.h
    CHK     include/generated/asm-offsets.h
    CALL    scripts/checksyscalls.sh
    CHK     include/generated/compile.h
    CHK     kernel/config_data.h
  make[1]: `arch/arm64/boot/Image.gz' is up to date.
    Building modules, stage 2.
    MODPOST 0 modules

The following is the build rule in arch/arm64/boot/Makefile:

  $(obj)/Image.gz: $(obj)/Image FORCE
          $(call if_changed,gzip)

If the Image.gz is newer than the Image and the command line has not
changed (i.e., $(any-prereq) and $(arg-check) are both empty), the
build rule $(call if_changed,gzip) is evaluated to be empty, then
GNU Make reports the target is up to date.  In order to make GNU Make
quiet, we need to give it something to do, for example, "@:".  This
should be fixed in the Kbuild core part rather than in each Makefile.
Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: NMichal Marek <mmarek@suse.com>
      2aedcd09
  7. 04 9月, 2015 1 次提交
  9. 14 8月, 2015 1 次提交
    • D
      modsign: Handle signing key in source tree · 3ee550f1
      由 David Woodhouse 提交于 
      Since commit 1329e8cc ("modsign: Extract signing cert from
CONFIG_MODULE_SIG_KEY if needed"), the build system has carefully coped
with the signing key being specified as a relative path in either the
source or or the build trees.

However, the actual signing of modules has not worked if the filename
is relative to the source tree.

Fix that by moving the config_filename helper into scripts/Kbuild.include
so that it can be used from elsewhere, and then using it in the top-level
Makefile to find the signing key file.

Kill the intermediate $(MODPUBKEY) and $(MODSECKEY) variables too, while
we're at it. There's no need for them.
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: NDavid Howells <dhowells@redhat.com>
      3ee550f1
  11. 10 1月, 2015 3 次提交
  13. 03 12月, 2014 1 次提交
  15. 26 11月, 2014 1 次提交
  17. 22 10月, 2014 1 次提交
  19. 02 10月, 2014 1 次提交
  21. 08 8月, 2014 1 次提交
  23. 30 3月, 2014 1 次提交
  25. 14 2月, 2014 1 次提交
  27. 08 4月, 2013 1 次提交
    • A
      kbuild: fix ld-option function · 5b83df2b
      由 Antony Pavlov 提交于 
      The kbuild's ld-option function is broken because
the command
  $(CC) /dev/null -c -o "$$TMPO"
does not create object file!

I have used a relatively old mips gcc 3.4.6 cross-compiler
and a relatively new gcc 4.7.2 to check this fact
but the results are the same.

EXAMPLE:
  $ rm /tmp/1.o
  $ mips-linux-gcc /dev/null -c -o /tmp/1.o
  mips-linux-gcc: /dev/null: linker input file unused because linking not done
  $ ls -la /tmp/1.o
  ls: cannot access /tmp/1.o: No such file or directory

We can easily fix the problem by adding
the '-x c' compiler option.

EXAMPLE:
  $ rm /tmp/1.o
  $ mips-linux-gcc -x c /dev/null -c -o /tmp/1.o
  $ ls -la /tmp/1.o
  -rw-r--r-- 1 antony antony 778 Apr  2 20:40 /tmp/1.o

Also fix wrong ld-option example.
Signed-off-by: NAntony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: NMichal Marek <mmarek@suse.cz>
      5b83df2b
  29. 06 10月, 2012 1 次提交
  31. 03 10月, 2012 1 次提交
    • J
      kbuild: Fix gcc -x syntax · b1e0d8b7
      由 Jean Delvare 提交于 
      The correct syntax for gcc -x is "gcc -x assembler", not
"gcc -xassembler". Even though the latter happens to work, the former
is what is documented in the manual page and thus what gcc wrappers
such as icecream do expect.

This isn't a cosmetic change. The missing space prevents icecream from
recognizing compilation tasks it can't handle, leading to silent kernel
miscompilations.

Besides me, credits go to Michael Matz and Dirk Mueller for
investigating the miscompilation issue and tracking it down to this
incorrect -x parameter syntax.
Signed-off-by: NJean Delvare <jdelvare@suse.de>
Acked-by: NIngo Molnar <mingo@kernel.org>
Cc: stable@vger.kernel.org
Cc: Bernhard Walle <bernhard@bwalle.de>
Cc: Michal Marek <mmarek@suse.cz>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: NMichal Marek <mmarek@suse.cz>
      b1e0d8b7
  33. 25 3月, 2012 1 次提交
    • B
      scripts/Kbuild.include: Fix portability problem of "echo -e" · 875de986
      由 Bernhard Walle 提交于 
      "echo -e" is a GNU extension. When cross-compiling the kernel on a
BSD-like operating system (Mac OS X in my case), this doesn't work.

One could install a GNU version of echo, put that in the $PATH before
the system echo and use "/usr/bin/env echo", but the solution with
printf is simpler.

Since it is no disadvantage on Linux, I hope that gets accepted even if
cross-compiling the Linux kernel on another Unix operating system is
quite a rare use case.
Signed-off-by: NBernhard Walle <bernhard@bwalle.de>
Andreas Bießmann <andreas@biessmann.de>
Signed-off-by: NMichal Marek <mmarek@suse.cz>
      875de986
  35. 10 6月, 2011 1 次提交
  37. 16 5月, 2011 1 次提交
    • M
      kbuild: make KBUILD_NOCMDDEP=1 handle empty built-in.o · c4d5ee13
      由 Michal Marek 提交于 
      Based on a patch by Rabin Vincent.

Fix building with KBUILD_NOCMDDEP=1, which currently does not work
because it does not build built-in.o with no dependencies:

  LD      fs/notify/built-in.o
ld: cannot find fs/notify/dnotify/built-in.o: No such file or directory
ld: cannot find fs/notify/inotify/built-in.o: No such file or directory
ld: cannot find fs/notify/fanotify/built-in.o: No such file or directory
Reported-and-tested-by: NRabin Vincent <rabin@rab.in>
Signed-off-by: NMichal Marek <mmarek@suse.cz>
      c4d5ee13
  39. 03 5月, 2011 1 次提交
  41. 20 4月, 2011 1 次提交
  43. 12 12月, 2009 1 次提交
    • M
      kbuild: generate modules.builtin · bc081dd6
      由 Michal Marek 提交于 
      To make it easier for module-init-tools and scripts like mkinitrd to
distinguish builtin and missing modules, install a modules.builtin file
listing all builtin modules. This is done by generating an additional
config file (tristate.conf) with tristate options set to uppercase 'Y'
or 'M'. If we source that config file, the builtin modules appear in
obj-Y.
Signed-off-by: NMichal Marek <mmarek@suse.cz>
      bc081dd6
  45. 12 10月, 2009 1 次提交
  47. 20 9月, 2009 3 次提交
  49. 04 12月, 2008 3 次提交
  51. 10 9月, 2008 1 次提交
  53. 12 2月, 2008 1 次提交
    • S
      kbuild: fix make V=1 · fab1e310
      由 Sam Ravnborg 提交于 
      When make -s support were added to filechk to
combination created with make V=1 were not
covered.
Fix it by explicitly cover this case too.
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>
Cc: Mike Frysinger <vapier@gentoo.org>
      fab1e310
  55. 09 2月, 2008 1 次提交
  57. 20 10月, 2007 1 次提交
    • S
      kbuild: introduce cc-cross-prefix · 910b4046
      由 Sam Ravnborg 提交于 
      cc-cross-prefix is useful for the architecture that like
to provide a default CROSS_COMPILE value,
but may have several to select between.

Sample usage:

ifneq ($(SUBARCH),$(ARCH))
        ifeq ($(CROSS_COMPILE),)
               CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-)
        endif
endif

Actual usage by the different archs will taken care of later.
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>
      910b4046
  59. 16 10月, 2007 1 次提交
    • S
      kbuild: enable 'make AFLAGS=...' to add additional options to AS · 222d394d
      由 Sam Ravnborg 提交于 
      The variable AFLAGS is a wellknown variable and the usage by
kbuild may result in unexpected behaviour.
On top of that several people over time has asked for a way to
pass in additional flags to gcc.

This patch replace use of AFLAGS with KBUILD_AFLAGS all over
the tree.

Patch was tested on following architectures:
alpha, arm, i386, x86_64, mips, sparc, sparc64, ia64, m68k, s390
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>
      222d394d
  61. 15 10月, 2007 1 次提交
    • S
      kbuild: enable 'make CFLAGS=...' to add additional options to CC · a0f97e06
      由 Sam Ravnborg 提交于 
      The variable CFLAGS is a wellknown variable and the usage by
kbuild may result in unexpected behaviour.
On top of that several people over time has asked for a way to
pass in additional flags to gcc.

This patch replace use of CFLAGS with KBUILD_CFLAGS all over the
tree and enabling one to use:
make CFLAGS=...
to specify additional gcc commandline options.

One usecase is when trying to find gcc bugs but other
use cases has been requested too.

Patch was tested on following architectures:
alpha, arm, i386, x86_64, mips, sparc, sparc64, ia64, m68k

Test was simple to do a defconfig build, apply the patch and check
that nothing got rebuild.
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>
      a0f97e06
  63. 17 7月, 2007 1 次提交
  65. 10 2月, 2007 1 次提交