On 25/07/16 01:30, Nicolas Pitre wrote: > This series provides the necessary changes to allow "flat" executable > binaries meant for no-MMU systems to actually run on systems with a MMU. > Also thrown in are various cleanups to binfmt_flat.c. > > This can also be found in the following git repo: > > git://git.linaro.org/people/nicolas.pitre/linux binfmt_flat_with_mmu So everyone is in the loop - I have pulled this into my for-linus branch at https://git.kernel.org/cgit/linux/kernel/git/gerg/m68knommu.git/ , excepting patch 15 (ARM specific changes). My continued testing hasn't found any issues on m68k platforms. I can completely boot up with a no-MMU user space and run on an MMU enabled ColdFire platform). I'll like to consider pushing this to Linus nearer the end of the merge window if no-one has any objections. Regards Greg > *Why?* > > Because developing and testing natively on a large system with lots of > RAM makes it so much more convenient to use all the existing profiling > tools and debugging facilities that a kernel with lots of RAM can give. > And incidentally, those systems with lots of RAM all have a MMU. > > *Why not use elf_fdpic?* > > The flat executable format is simple with very small footprint > overhead, either in the executables themselves or kernel support. > This makes the flat format more suitable than elf_fdpic for very small > single user-app embedded systems. > > And while elf_fdpic binaries can run on MMU systems, flat binaries still > couldn't, which just felt wrong. > > So here it is. The no-MMU support should remain unaffected, confirmed by > Greg Ungerer. Tested with MMU on ARM and M68K. > > Changes since v4: > > - Isolated architecture specific changes in their own patches for easier > review through their own path to mainline. > > - Added needed m68k register fixup from Greg Ungerer. > > Changes since v3: > > - Small cosmetic changes to pr_*(). > > - Addressed most important checkpatch complaints on the whole source file > and patches in this seris. > > Changes since v2: > > - Added protection against a corrupted header that could have caused nasty > overflows etc. Suggested by Alan Cox. > > - printk() modernization. Suggested by Greg Ungerer / Geert Uytterhoeven. > > - Added Greg Ungerer's reviewed-by tag. > > Changes since v1: > > - Removed SuperH and Xtensa from the Kconfig rule as they fail to build > due to lack of get/put_unaligned_user(). > > - Clarified some commit logs a bit. > > diffstat: > > arch/arm/include/asm/flat.h | 5 +- > arch/m68k/include/asm/flat.h | 11 +- > arch/m68k/include/asm/processor.h | 2 - > fs/Kconfig.binfmt | 3 +- > fs/binfmt_elf_fdpic.c | 38 +-- > fs/binfmt_flat.c | 525 ++++++++++++++++++-------------- > fs/exec.c | 33 ++ > include/linux/binfmts.h | 2 + > 8 files changed, 345 insertions(+), 274 deletions(-) > -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
