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| author | Ingo Molnar <mingo@kernel.org> | 2012-04-14 15:18:27 +0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2012-04-14 15:19:04 +0400 |
| commit | 6ac1ef482d7ae0c690f1640bf6eb818ff9a2d91e (patch) | |
| tree | 021cc9f6b477146fcebe6f3be4752abfa2ba18a9 /arch/um/kernel/skas/mmu.c | |
| parent | 682968e0c425c60f0dde37977e5beb2b12ddc4cc (diff) | |
| parent | a385ec4f11bdcf81af094c03e2444ee9b7fad2e5 (diff) | |
| download | linux-6ac1ef482d7ae0c690f1640bf6eb818ff9a2d91e.tar.xz | |
Merge branch 'perf/core' into perf/uprobes
Merge in latest upstream (and the latest perf development tree),
to prepare for tooling changes, and also to pick up v3.4 MM
changes that the uprobes code needs to take care of.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/um/kernel/skas/mmu.c')
| -rw-r--r-- | arch/um/kernel/skas/mmu.c | 25 |
1 files changed, 6 insertions, 19 deletions
diff --git a/arch/um/kernel/skas/mmu.c b/arch/um/kernel/skas/mmu.c index 1aee587e9c5d..4947b319f53a 100644 --- a/arch/um/kernel/skas/mmu.c +++ b/arch/um/kernel/skas/mmu.c @@ -92,8 +92,6 @@ int init_new_context(struct task_struct *task, struct mm_struct *mm) goto out_free; } - to_mm->stub_pages = NULL; - return 0; out_free: @@ -103,7 +101,7 @@ int init_new_context(struct task_struct *task, struct mm_struct *mm) return ret; } -void arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm) +void uml_setup_stubs(struct mm_struct *mm) { struct page **pages; int err, ret; @@ -120,29 +118,20 @@ void arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm) if (ret) goto out; - pages = kmalloc(2 * sizeof(struct page *), GFP_KERNEL); - if (pages == NULL) { - printk(KERN_ERR "arch_dup_mmap failed to allocate 2 page " - "pointers\n"); - goto out; - } - - pages[0] = virt_to_page(&__syscall_stub_start); - pages[1] = virt_to_page(mm->context.id.stack); - mm->context.stub_pages = pages; + mm->context.stub_pages[0] = virt_to_page(&__syscall_stub_start); + mm->context.stub_pages[1] = virt_to_page(mm->context.id.stack); /* dup_mmap already holds mmap_sem */ err = install_special_mapping(mm, STUB_START, STUB_END - STUB_START, VM_READ | VM_MAYREAD | VM_EXEC | - VM_MAYEXEC | VM_DONTCOPY, pages); + VM_MAYEXEC | VM_DONTCOPY, + mm->context.stub_pages); if (err) { printk(KERN_ERR "install_special_mapping returned %d\n", err); - goto out_free; + goto out; } return; -out_free: - kfree(pages); out: force_sigsegv(SIGSEGV, current); } @@ -151,8 +140,6 @@ void arch_exit_mmap(struct mm_struct *mm) { pte_t *pte; - if (mm->context.stub_pages != NULL) - kfree(mm->context.stub_pages); pte = virt_to_pte(mm, STUB_CODE); if (pte != NULL) pte_clear(mm, STUB_CODE, pte); |