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Date: Fri, 20 Mar 2015 16:53:27 +0100
From: Laurent Dufour <ldufour@...ux.vnet.ibm.com>
To: Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Paul Mackerras <paulus@...ba.org>,
Michael Ellerman <mpe@...erman.id.au>,
Jeff Dike <jdike@...toit.com>,
Richard Weinberger <richard@....at>,
Guan Xuetao <gxt@...c.pku.edu.cn>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
Arnd Bergmann <arnd@...db.de>, linuxppc-dev@...ts.ozlabs.org,
linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
user-mode-linux-devel@...ts.sourceforge.net,
user-mode-linux-user@...ts.sourceforge.net,
linux-arch@...r.kernel.org, linux-mm@...ck.org
Cc: cov@...eaurora.org, criu@...nvz.org
Subject: [PATCH 1/2] mm: Introducing arch_remap hook
Some architecture would like to be triggered when a memory area is moved
through the mremap system call.
This patch is introducing a new arch_remap mm hook which is placed in the
path of mremap, and is called before the old area is unmapped (and the
arch_unmap hook is called).
To no break the build, this patch adds the empty hook definition to the
architectures that were not using the generic hook's definition.
Signed-off-by: Laurent Dufour <ldufour@...ux.vnet.ibm.com>
---
arch/s390/include/asm/mmu_context.h | 6 ++++++
arch/um/include/asm/mmu_context.h | 5 +++++
arch/unicore32/include/asm/mmu_context.h | 6 ++++++
arch/x86/include/asm/mmu_context.h | 6 ++++++
include/asm-generic/mm_hooks.h | 6 ++++++
mm/mremap.c | 9 +++++++--
6 files changed, 36 insertions(+), 2 deletions(-)
diff --git a/arch/s390/include/asm/mmu_context.h b/arch/s390/include/asm/mmu_context.h
index 8fb3802f8fad..ddd861a490ba 100644
--- a/arch/s390/include/asm/mmu_context.h
+++ b/arch/s390/include/asm/mmu_context.h
@@ -131,4 +131,10 @@ static inline void arch_bprm_mm_init(struct mm_struct *mm,
{
}
+static inline void arch_remap(struct mm_struct *mm,
+ unsigned long old_start, unsigned long old_end,
+ unsigned long new_start, unsigned long new_end)
+{
+}
+
#endif /* __S390_MMU_CONTEXT_H */
diff --git a/arch/um/include/asm/mmu_context.h b/arch/um/include/asm/mmu_context.h
index 941527e507f7..f499b017c1f9 100644
--- a/arch/um/include/asm/mmu_context.h
+++ b/arch/um/include/asm/mmu_context.h
@@ -27,6 +27,11 @@ static inline void arch_bprm_mm_init(struct mm_struct *mm,
struct vm_area_struct *vma)
{
}
+static inline void arch_remap(struct mm_struct *mm,
+ unsigned long old_start, unsigned long old_end,
+ unsigned long new_start, unsigned long new_end)
+{
+}
/*
* end asm-generic/mm_hooks.h functions
*/
diff --git a/arch/unicore32/include/asm/mmu_context.h b/arch/unicore32/include/asm/mmu_context.h
index 1cb5220afaf9..39a0a553172e 100644
--- a/arch/unicore32/include/asm/mmu_context.h
+++ b/arch/unicore32/include/asm/mmu_context.h
@@ -97,4 +97,10 @@ static inline void arch_bprm_mm_init(struct mm_struct *mm,
{
}
+static inline void arch_remap(struct mm_struct *mm,
+ unsigned long old_start, unsigned long old_end,
+ unsigned long new_start, unsigned long new_end)
+{
+}
+
#endif
diff --git a/arch/x86/include/asm/mmu_context.h b/arch/x86/include/asm/mmu_context.h
index 883f6b933fa4..75cb71f4be1e 100644
--- a/arch/x86/include/asm/mmu_context.h
+++ b/arch/x86/include/asm/mmu_context.h
@@ -172,4 +172,10 @@ static inline void arch_unmap(struct mm_struct *mm, struct vm_area_struct *vma,
mpx_notify_unmap(mm, vma, start, end);
}
+static inline void arch_remap(struct mm_struct *mm,
+ unsigned long old_start, unsigned long old_end,
+ unsigned long new_start, unsigned long new_end)
+{
+}
+
#endif /* _ASM_X86_MMU_CONTEXT_H */
diff --git a/include/asm-generic/mm_hooks.h b/include/asm-generic/mm_hooks.h
index 866aa461efa5..e507f4783a5b 100644
--- a/include/asm-generic/mm_hooks.h
+++ b/include/asm-generic/mm_hooks.h
@@ -26,4 +26,10 @@ static inline void arch_bprm_mm_init(struct mm_struct *mm,
{
}
+static inline void arch_remap(struct mm_struct *mm,
+ unsigned long old_start, unsigned long old_end,
+ unsigned long new_start, unsigned long new_end)
+{
+}
+
#endif /* _ASM_GENERIC_MM_HOOKS_H */
diff --git a/mm/mremap.c b/mm/mremap.c
index 57dadc025c64..6a409ca09425 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -25,6 +25,7 @@
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
+#include <asm/mmu_context.h>
#include "internal.h"
@@ -286,8 +287,12 @@ static unsigned long move_vma(struct vm_area_struct *vma,
old_len = new_len;
old_addr = new_addr;
new_addr = -ENOMEM;
- } else if (vma->vm_file && vma->vm_file->f_op->mremap)
- vma->vm_file->f_op->mremap(vma->vm_file, new_vma);
+ } else {
+ if (vma->vm_file && vma->vm_file->f_op->mremap)
+ vma->vm_file->f_op->mremap(vma->vm_file, new_vma);
+ arch_remap(mm, old_addr, old_addr+old_len,
+ new_addr, new_addr+new_len);
+ }
/* Conceal VM_ACCOUNT so old reservation is not undone */
if (vm_flags & VM_ACCOUNT) {
--
1.9.1
--
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