Generic headers allow ARCH maintainers to remove all dummy arch/ARCH/include/asm/XXX.h files or, depending on the architecture, include/asm-ARCH/XXX.h (e.g. arch/x86/include/asm/errno.h) that only include the _name equivalent_ include/asm-generic/XXX.h file (e.g. include/asm-generic/errno.h) with _no_ changes. It was called generic headers for short. Arnd Bergmann gave the original idea and asked me to implement it. To use it just two steps are necessary: - Remove all the dummy arch/ARCH/include/asm/XXX.h files (e.g. rm arch/x86/include/asm/errno.h) - Add the variable generic-y with the names of the removed files (e.g. generic-y += errno.h) in the arch/ARCH/include/asm/Kbuild (e.g. arch/x86/include/asm/Kbuild) The removed files will be automatically generated during the build process by the script scripts/Makefile.genericheaders. The scripts/Makefile.headersinst was adapted to avoid errors (due to the removal of header files from their default locations) so it would pass the 'make headers_check'. The generic headers were applyed and tested in both x86 (tested in my Notebook with i386_defconfig on kernel 2.6.29-rc7 of 09/Mar/2009 from Linus git tree) and powerpc (tested in my PS3 with ps3_defconfig on kernel 2.6.29-rc7 of 11/Mar/2009 from Geoff Levand git tree). Both compiled and booted without problems. This approach does not reduce much LOC but, in a rough estimation, it would allow the removal of around 90 dummy header files among all architectures. PS: This is my first e-mail/patch here. Sorry for any misbehaviour :) Remis Lima Baima (3): Create the infrastructure for generic headers Apply generic headers for x86 Apply generic headers for PPC Makefile | 4 +++ arch/powerpc/include/asm/Kbuild | 8 ++++++ arch/powerpc/include/asm/div64.h | 1 - arch/powerpc/include/asm/emergency-restart.h | 1 - arch/powerpc/include/asm/irq_regs.h | 2 - arch/powerpc/include/asm/poll.h | 1 - arch/powerpc/include/asm/resource.h | 1 - arch/powerpc/include/asm/statfs.h | 6 ---- arch/powerpc/include/asm/xor.h | 1 - arch/x86/include/asm/Kbuild | 9 +++++++ arch/x86/include/asm/cputime.h | 1 - arch/x86/include/asm/errno.h | 1 - arch/x86/include/asm/fcntl.h | 1 - arch/x86/include/asm/ioctl.h | 1 - arch/x86/include/asm/poll.h | 1 - arch/x86/include/asm/resource.h | 1 - arch/x86/include/asm/rtc.h | 1 - arch/x86/include/asm/sections.h | 1 - scripts/Makefile.genericheaders | 34 ++++++++++++++++++++++++++ scripts/Makefile.headersinst | 4 +++ 20 files changed, 59 insertions(+), 21 deletions(-) delete mode 100644 arch/powerpc/include/asm/div64.h delete mode 100644 arch/powerpc/include/asm/emergency-restart.h delete mode 100644 arch/powerpc/include/asm/irq_regs.h delete mode 100644 arch/powerpc/include/asm/poll.h delete mode 100644 arch/powerpc/include/asm/resource.h delete mode 100644 arch/powerpc/include/asm/statfs.h delete mode 100644 arch/powerpc/include/asm/xor.h delete mode 100644 arch/x86/include/asm/cputime.h delete mode 100644 arch/x86/include/asm/errno.h delete mode 100644 arch/x86/include/asm/fcntl.h delete mode 100644 arch/x86/include/asm/ioctl.h delete mode 100644 arch/x86/include/asm/poll.h delete mode 100644 arch/x86/include/asm/resource.h delete mode 100644 arch/x86/include/asm/rtc.h delete mode 100644 arch/x86/include/asm/sections.h create mode 100644 scripts/Makefile.genericheaders -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
