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  1. 15 Mar, 2016 1 commit
    • Daniel Wagner's avatar
      kbuild: Add option to turn incompatible pointer check into error · ea8daa7b
      Daniel Wagner authored 
      With the introduction of the simple wait API we have two very
similar APIs in the kernel. For example wake_up() and swake_up()
is only one character away. Although the compiler will warn
happily the wrong usage it keeps on going an even links the kernel.
Thomas and Peter would rather like to see early missuses reported
as error early on.

In a first attempt we tried to wrap all swait and wait calls
into a macro which has an compile time type assertion. The result
was pretty ugly and wasn't able to catch all wrong usages.
woken_wake_function(), autoremove_wake_function() and wake_bit_function()
are assigned as function pointers. Wrapping them with a macro around is
not possible. Prefixing them with '_' was also not a real option
because there some users in the kernel which do use them as well.
All in all this attempt looked to intrusive and too ugly.

An alternative is to turn the pointer type check into an error which
catches wrong type uses. Obviously not only the swait/wait ones. That
isn't a bad thing either.
Signed-off-by: default avatarDaniel Wagner <daniel.wagner@bmw-carit.de>
Acked-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: default avatarThomas Gleixner <tglx@linutronix.de>
Acked-by: default avatarIngo Molnar <mingo@kernel.org>
Signed-off-by: default avatarMichal Marek <mmarek@suse.com>
      ea8daa7b
  3. 04 Mar, 2016 1 commit
    • Masahiro Yamada's avatar
      kbuild: suppress annoying "... is up to date." message · 2aedcd09
      Masahiro Yamada authored 
      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: default avatarMasahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: default avatarMichal Marek <mmarek@suse.com>
      2aedcd09
  5. 17 Feb, 2016 1 commit
  7. 08 Feb, 2016 2 commits
    • Ard Biesheuvel's avatar
      scripts/link-vmlinux.sh: force error on kallsyms failure · a0439342
      Ard Biesheuvel authored 
      Since the output of the invocation of scripts/kallsyms is piped directly
into the assembler, error messages it emits are visible on stderr, but
a non-zero return code is ignored, and the build simply proceeds in that
case. However, the resulting kernel is most likely broken, and will crash
at boot.

So instead, capture the output of kallsyms in a separate .S file, and pass
that to the assembler in a separate step.
Signed-off-by: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: default avatarMichal Marek <mmarek@suse.com>
      a0439342
    • Arnd Bergmann's avatar
      Kbuild: provide a __UNIQUE_ID for clang · b41c29b0
      Arnd Bergmann authored 
      The default __UNIQUE_ID macro in compiler.h fails to work for some drivers:

drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c:615:1: error: redefinition of
      '__UNIQUE_ID_firmware615'
BRCMF_FW_NVRAM_DEF(4354, "brcmfmac4354-sdio.bin", "brcmfmac4354-sdio.txt");

This adds a copy of the version we use for gcc-4.3 and higher, as the same
one works with all versions of clang that I could find in svn (2.6 and higher).
Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
Signed-off-by: default avatarMichal Marek <mmarek@suse.com>
      b41c29b0
  9. 28 Jan, 2016 1 commit
    • Russell King's avatar
      dtbsinstall: don't move target directory out of the way · 5399eb9b
      Russell King authored 
      No other kernel installation target moves the target directory out of
the way, even deleting an old version of it.  These are destructive
operations, ones which the kernel build system should not be making.

This behaviour prevents being able to do:

	make install INSTALL_PATH=/some/path/boot
	make dtbs_install INSTALL_DTBS_PATH=/some/path/boot

As it causes the boot directory containing the kernel installed in
step 1 to be moved to /some/path/boot.old.  Things get even more fun
if you do:

	make install dtbs_install INSTALL_PATH=/some/path/boot INSTALL_DTBS_PATH=/some/path/boot

The kernel gets installed into /some/path/boot, then the directory gets
renamed to /some/path/boot.old, and a new directory created to hold the
dtbs.  Even more fun if you supply -j2 when we end up with races in
make.

Remove this behaviour.

If this behaviour is required at installation time, this should be
done by the installation external to the kernel makefiles, just like
it would be done for 'make modules_install'.
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
Acked-by: default avatarJason Cooper <jason@lakedaemon.net>
Acked-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarMichal Marek <mmarek@suse.com>
      5399eb9b
  11. 24 Jan, 2016 34 commits
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