From d6dd61c831226f9cd7750885da04d360d6455101 Mon Sep 17 00:00:00 2001 From: Jeremy Fitzhardinge Date: Wed, 2 May 2007 19:27:14 +0200 Subject: [PATCH] x86: PARAVIRT: add hooks to intercept mm creation and destruction Add hooks to allow a paravirt implementation to track the lifetime of an mm. Paravirtualization requires three hooks, but only two are needed in common code. They are: arch_dup_mmap, which is called when a new mmap is created at fork arch_exit_mmap, which is called when the last process reference to an mm is dropped, which typically happens on exit and exec. The third hook is activate_mm, which is called from the arch-specific activate_mm() macro/function, and so doesn't need stub versions for other architectures. It's called when an mm is first used. Signed-off-by: Jeremy Fitzhardinge Signed-off-by: Andi Kleen Cc: linux-arch@vger.kernel.org Cc: James Bottomley Acked-by: Ingo Molnar --- include/asm-generic/mm_hooks.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) create mode 100644 include/asm-generic/mm_hooks.h (limited to 'include/asm-generic/mm_hooks.h') diff --git a/include/asm-generic/mm_hooks.h b/include/asm-generic/mm_hooks.h new file mode 100644 index 000000000000..67dea8123683 --- /dev/null +++ b/include/asm-generic/mm_hooks.h @@ -0,0 +1,18 @@ +/* + * Define generic no-op hooks for arch_dup_mmap and arch_exit_mmap, to + * be included in asm-FOO/mmu_context.h for any arch FOO which doesn't + * need to hook these. + */ +#ifndef _ASM_GENERIC_MM_HOOKS_H +#define _ASM_GENERIC_MM_HOOKS_H + +static inline void arch_dup_mmap(struct mm_struct *oldmm, + struct mm_struct *mm) +{ +} + +static inline void arch_exit_mmap(struct mm_struct *mm) +{ +} + +#endif /* _ASM_GENERIC_MM_HOOKS_H */ -- cgit v1.2.1