The generic NVRAM module, drivers/char/generic_nvram, implements a /dev/nvram misc device. It is used only by 32-bit PowerPC platforms and isn't generic enough to be more widely used.
The RTC NVRAM module, drivers/char/nvram, also implements a /dev/nvram misc device. It is used by x86, ARM and m68k. The former module cannot be used on x86, ARM or m68k because it cannot co-exist with the latter module, partly due to the Kconfig logic. It is possible to modify the modules so that one kernel binary could have either, neither or both. However, automatically loading the appropriate module is then impossible; if both provide the char-major-10-144 alias then the wrong module will end up being loaded. Hence a multi-platform kernel binary needs a single generic nvram module with alias char-major-10-144. Therefore, drivers/char/nvram.c should be made more generic and the arch-specific code therein should be moved to a more appropriate place under arch/. Also, drivers/char/generic_nvram.c should be removed to reduce code duplication. In this patch series, Atari-specific code is moved from the nvram module to arch/m68k/atari. More arch-specific code in the nvram module could be moved, probably to arch/x86, but it is difficult to determine just what code is relevant to ARM platforms and what code is x86-only. In addressing code duplication, this patch series removes three inconsistent /dev/nvram misc device implementations. One of these, drivers/macintosh/nvram.c is entirely unused already. The other two, drivers/char/generic_nvram.c and the misc device implementation in arch/powerpc/kernel/nvram_64.c, are replaced by drivers/char/nvram.c. A benefit of this work is better consistency -- between PPC32 and PPC64 as well as between PPC_PMAC and MAC. This new uniformity does have implications for userspace, that is, some error codes for some ioctl calls become consistent on all PowerPC platforms. The drivers/char/nvram module becomes sufficiently generic to be useful to other platforms and architectures, besides those with "CMOS" RTC. At the end of this patch series the module is adopted by the m68k Mac port, which already has PRAM access functions but lacks the /dev/nvram misc device. This patch series has been compile-tested for arm, m68k, powerpc and x86. The nvram and thinkpad_acpi modules were regression tested on a ThinkPad T43. The /dev/nvram functionality was also regression tested on a G3 PowerMac. The nvram module was also tested on a PowerBook 520 and Quadra 650. Note that my testing doesn't cover PPC64 or Atari. --- arch/m68k/Kconfig | 3 arch/m68k/atari/Makefile | 2 arch/m68k/atari/nvram.c | 291 +++++++++++ arch/m68k/kernel/setup_mm.c | 107 ++++ arch/m68k/mac/misc.c | 144 +++-- arch/powerpc/Kconfig | 5 arch/powerpc/include/asm/nvram.h | 9 arch/powerpc/kernel/nvram_64.c | 203 +------ arch/powerpc/kernel/setup_32.c | 27 - arch/powerpc/platforms/chrp/Makefile | 2 arch/powerpc/platforms/chrp/nvram.c | 14 arch/powerpc/platforms/chrp/setup.c | 2 arch/powerpc/platforms/powermac/Makefile | 5 arch/powerpc/platforms/powermac/nvram.c | 9 arch/powerpc/platforms/powermac/setup.c | 3 drivers/char/Kconfig | 13 drivers/char/Makefile | 6 drivers/char/generic_nvram.c | 174 ------ drivers/char/nvram.c | 742 ++++++++++++----------------- drivers/macintosh/nvram.c | 130 ----- drivers/platform/x86/thinkpad_acpi.c | 20 drivers/scsi/Kconfig | 6 drivers/scsi/atari_scsi.c | 16 drivers/video/fbdev/controlfb.c | 4 drivers/video/fbdev/imsttfb.c | 7 drivers/video/fbdev/matrox/matroxfb_base.c | 4 drivers/video/fbdev/platinumfb.c | 4 drivers/video/fbdev/valkyriefb.c | 4 include/linux/nvram.h | 23 include/uapi/linux/pmu.h | 2 30 files changed, 937 insertions(+), 1044 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
