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authorDave Hansen <dave.hansen@linux.intel.com>2014-11-18 21:23:50 +0300
committerThomas Gleixner <tglx@linutronix.de>2014-11-19 13:54:13 +0300
commit62e88b1c00de9cb30d937841ed5debed871070b8 (patch)
treefe74bed1563012ebbab7a3d4c87caaa25c804593 /arch/um
parenta1ea1c032b8f8c23d86ef4db6d061527e9417f19 (diff)
downloadlinux-62e88b1c00de9cb30d937841ed5debed871070b8.tar.xz
mm: Make arch_unmap()/bprm_mm_init() available to all architectures
The x86 MPX patch set calls arch_unmap() and arch_bprm_mm_init() from fs/exec.c, so we need at least a stub for them in all architectures. They are only called under an #ifdef for CONFIG_MMU=y, so we can at least restict this to architectures with MMU support. blackfin/c6x have no MMU support, so do not call arch_unmap(). They also do not include mm_hooks.h or mmu_context.h at all and do not need to be touched. s390, um and unicore32 do not use asm-generic/mm_hooks.h, so got their own arch_unmap() versions. (I also moved um's arch_dup_mmap() to be closer to the other mm_hooks.h functions). xtensa only includes mm_hooks when MMU=y, which should be fine since arch_unmap() is called only from MMU=y code. For the rest, we use the stub copies of these functions in asm-generic/mm_hook.h. I cross compiled defconfigs for cris (to check NOMMU) and s390 to make sure that this works. I also checked a 64-bit build of UML and all my normal x86 builds including PARAVIRT on and off. Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Cc: Dave Hansen <dave@sr71.net> Cc: linux-arch@vger.kernel.org Cc: x86@kernel.org Link: http://lkml.kernel.org/r/20141118182350.8B4AA2C2@viggo.jf.intel.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/um')
-rw-r--r--arch/um/include/asm/mmu_context.h24
1 files changed, 19 insertions, 5 deletions
diff --git a/arch/um/include/asm/mmu_context.h b/arch/um/include/asm/mmu_context.h
index aa4a743dc4ab..941527e507f7 100644
--- a/arch/um/include/asm/mmu_context.h
+++ b/arch/um/include/asm/mmu_context.h
@@ -10,7 +10,26 @@
#include <asm/mmu.h>
extern void uml_setup_stubs(struct mm_struct *mm);
+/*
+ * Needed since we do not use the asm-generic/mm_hooks.h:
+ */
+static inline void arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm)
+{
+ uml_setup_stubs(mm);
+}
extern void arch_exit_mmap(struct mm_struct *mm);
+static inline void arch_unmap(struct mm_struct *mm,
+ struct vm_area_struct *vma,
+ unsigned long start, unsigned long end)
+{
+}
+static inline void arch_bprm_mm_init(struct mm_struct *mm,
+ struct vm_area_struct *vma)
+{
+}
+/*
+ * end asm-generic/mm_hooks.h functions
+ */
#define deactivate_mm(tsk,mm) do { } while (0)
@@ -41,11 +60,6 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
}
}
-static inline void arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm)
-{
- uml_setup_stubs(mm);
-}
-
static inline void enter_lazy_tlb(struct mm_struct *mm,
struct task_struct *tsk)
{