Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 2ae416b1 authored Jun 24, 2015 by Laurent Dufour Committed by Linus Torvalds Jun 24, 2015

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@linux.vnet.ibm.com>
Suggested-by: Andrew Morton <akpm@linux-foundation.org>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent e81f2d22

arch/alpha/include/asm/mm-arch-hooks.h

0 → 100644

+15 −0

Original line number	Diff line number	Diff line
		/*
		* Architecture specific mm hooks
		*
		* Copyright (C) 2015, IBM Corporation
		* Author: Laurent Dufour <ldufour@linux.vnet.ibm.com>
		*
		* 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 */

arch/arc/include/asm/mm-arch-hooks.h

0 → 100644

+15 −0

Original line number	Diff line number	Diff line
		/*
		* Architecture specific mm hooks
		*
		* Copyright (C) 2015, IBM Corporation
		* Author: Laurent Dufour <ldufour@linux.vnet.ibm.com>
		*
		* 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_ARC_MM_ARCH_HOOKS_H
		#define _ASM_ARC_MM_ARCH_HOOKS_H

		#endif /* _ASM_ARC_MM_ARCH_HOOKS_H */

arch/arm/include/asm/mm-arch-hooks.h

0 → 100644

+15 −0

Original line number	Diff line number	Diff line
		/*
		* Architecture specific mm hooks
		*
		* Copyright (C) 2015, IBM Corporation
		* Author: Laurent Dufour <ldufour@linux.vnet.ibm.com>
		*
		* 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_ARM_MM_ARCH_HOOKS_H
		#define _ASM_ARM_MM_ARCH_HOOKS_H

		#endif /* _ASM_ARM_MM_ARCH_HOOKS_H */

arch/arm64/include/asm/mm-arch-hooks.h

0 → 100644

+15 −0

Original line number	Diff line number	Diff line
		/*
		* Architecture specific mm hooks
		*
		* Copyright (C) 2015, IBM Corporation
		* Author: Laurent Dufour <ldufour@linux.vnet.ibm.com>
		*
		* 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_ARM64_MM_ARCH_HOOKS_H
		#define _ASM_ARM64_MM_ARCH_HOOKS_H

		#endif /* _ASM_ARM64_MM_ARCH_HOOKS_H */

arch/avr32/include/asm/mm-arch-hooks.h

0 → 100644

+15 −0

Original line number	Diff line number	Diff line
		/*
		* Architecture specific mm hooks
		*
		* Copyright (C) 2015, IBM Corporation
		* Author: Laurent Dufour <ldufour@linux.vnet.ibm.com>
		*
		* 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_AVR32_MM_ARCH_HOOKS_H
		#define _ASM_AVR32_MM_ARCH_HOOKS_H

		#endif /* _ASM_AVR32_MM_ARCH_HOOKS_H */