On Thu, Jun 25, 2015 at 6:08 AM, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx> wrote: > Gitweb: http://git.kernel.org/linus/;a=commit;h=2ae416b142b625c58c9ccb039aa3ef48ad0e9bae > Commit: 2ae416b142b625c58c9ccb039aa3ef48ad0e9bae > Parent: e81f2d22370f8231cb7f13f454bcc8c0eb4e23f2 > Refname: refs/heads/master > Author: Laurent Dufour <ldufour@xxxxxxxxxxxxxxxxxx> > AuthorDate: Wed Jun 24 16:56:16 2015 -0700 > Committer: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> > CommitDate: Wed Jun 24 17:49:41 2015 -0700 > > mm: new mm hook framework > > CRIU is recreating the process memory layout by remapping the checkpointee > memory area on top of the current process (criu). This includes remapping > the vDSO to the place it has at checkpoint time. > > However some architectures like powerpc are keeping a reference to the > vDSO base address to build the signal return stack frame by calling the > vDSO sigreturn service. So once the vDSO has been moved, this reference > is no more valid and the signal frame built later are not usable. > > This patch serie is introducing a new mm hook framework, and a new > arch_remap hook which is called when mremap is done and the mm lock still > hold. The next patch is adding the vDSO remap and unmap tracking to the > powerpc architecture. > > This patch (of 3): > > This patch introduces a new set of header file to manage mm hooks: > - per architecture empty header file (arch/x/include/asm/mm-arch-hooks.h) > - a generic header (include/linux/mm-arch-hooks.h) > > The architecture which need to overwrite a hook as to redefine it in its > header file, while architecture which doesn't need have nothing to do. > > The default hooks are defined in the generic header and are used in the > case the architecture is not defining it. > > In a next step, mm hooks defined in include/asm-generic/mm_hooks.h should > be moved here. > > Signed-off-by: Laurent Dufour <ldufour@xxxxxxxxxxxxxxxxxx> > Suggested-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> > Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx> > Cc: Hugh Dickins <hughd@xxxxxxxxxx> > Cc: Rik van Riel <riel@xxxxxxxxxx> > Cc: Mel Gorman <mgorman@xxxxxxx> > Cc: Pavel Emelyanov <xemul@xxxxxxxxxxxxx> > Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx> > Cc: Paul Mackerras <paulus@xxxxxxxxx> > Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx> > Cc: Ingo Molnar <mingo@xxxxxxxxxx> > Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> > Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> > --- > arch/alpha/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ > arch/arc/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ > arch/arm/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ > arch/arm64/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ > arch/avr32/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ > arch/blackfin/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ > arch/c6x/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ > arch/cris/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ > arch/frv/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ > arch/hexagon/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ > arch/ia64/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ > arch/m32r/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ > arch/m68k/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ > arch/metag/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ > arch/microblaze/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ > arch/mips/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ > arch/mn10300/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ > arch/nios2/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ > arch/openrisc/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ > arch/parisc/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ > arch/powerpc/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ > arch/s390/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ > arch/score/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ > arch/sh/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ > arch/sparc/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ > arch/tile/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ > arch/um/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ > arch/unicore32/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ > arch/x86/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ > arch/xtensa/include/asm/mm-arch-hooks.h | 15 +++++++++++++++ > include/linux/mm-arch-hooks.h | 16 ++++++++++++++++ Touching all arch/ directories without a CC to linux-arch? > 31 files changed, 466 insertions(+) > > diff --git a/arch/alpha/include/asm/mm-arch-hooks.h b/arch/alpha/include/asm/mm-arch-hooks.h > new file mode 100644 > index 0000000..b07fd86 > --- /dev/null > +++ b/arch/alpha/include/asm/mm-arch-hooks.h > @@ -0,0 +1,15 @@ > +/* > + * Architecture specific mm hooks > + * > + * Copyright (C) 2015, IBM Corporation > + * Author: Laurent Dufour <ldufour@xxxxxxxxxxxxxxxxxx> Cool, copyright on an empty header! > + * > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License version 2 as > + * published by the Free Software Foundation. > + */ > + > +#ifndef _ASM_ALPHA_MM_ARCH_HOOKS_H > +#define _ASM_ALPHA_MM_ARCH_HOOKS_H > + > +#endif /* _ASM_ALPHA_MM_ARCH_HOOKS_H */ [...] IMHO this screams for the generic version in include/asm-generic/, and "generic-y += mm-arch-hooks.h" in arch/*/include/asm/Kbuild/. Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>