aboutsummaryrefslogtreecommitdiffstats
path: root/arch/um/kernel/skas/mmu.c
diff options
context:
space:
mode:
authorIngo Molnar <mingo@kernel.org>2012-03-26 11:18:44 -0400
committerIngo Molnar <mingo@kernel.org>2012-03-26 11:19:03 -0400
commit7fd52392c56361a40f0c630a82b36b95ca31eac6 (patch)
tree14091de24c6b28ea4cae9826f98aeedb7be091f5 /arch/um/kernel/skas/mmu.c
parentb01c3a0010aabadf745f3e7fdb9cab682e0a28a2 (diff)
parente22057c8599373e5caef0bc42bdb95d2a361ab0d (diff)
Merge branch 'linus' into perf/urgent
Merge reason: we need to fix a non-trivial merge conflict. Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/um/kernel/skas/mmu.c')
-rw-r--r--arch/um/kernel/skas/mmu.c25
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)
92 goto out_free; 92 goto out_free;
93 } 93 }
94 94
95 to_mm->stub_pages = NULL;
96
97 return 0; 95 return 0;
98 96
99 out_free: 97 out_free:
@@ -103,7 +101,7 @@ int init_new_context(struct task_struct *task, struct mm_struct *mm)
103 return ret; 101 return ret;
104} 102}
105 103
106void arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm) 104void uml_setup_stubs(struct mm_struct *mm)
107{ 105{
108 struct page **pages; 106 struct page **pages;
109 int err, ret; 107 int err, ret;
@@ -120,29 +118,20 @@ void arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm)
120 if (ret) 118 if (ret)
121 goto out; 119 goto out;
122 120
123 pages = kmalloc(2 * sizeof(struct page *), GFP_KERNEL); 121 mm->context.stub_pages[0] = virt_to_page(&__syscall_stub_start);
124 if (pages == NULL) { 122 mm->context.stub_pages[1] = virt_to_page(mm->context.id.stack);
125 printk(KERN_ERR "arch_dup_mmap failed to allocate 2 page "
126 "pointers\n");
127 goto out;
128 }
129
130 pages[0] = virt_to_page(&__syscall_stub_start);
131 pages[1] = virt_to_page(mm->context.id.stack);
132 mm->context.stub_pages = pages;
133 123
134 /* dup_mmap already holds mmap_sem */ 124 /* dup_mmap already holds mmap_sem */
135 err = install_special_mapping(mm, STUB_START, STUB_END - STUB_START, 125 err = install_special_mapping(mm, STUB_START, STUB_END - STUB_START,
136 VM_READ | VM_MAYREAD | VM_EXEC | 126 VM_READ | VM_MAYREAD | VM_EXEC |
137 VM_MAYEXEC | VM_DONTCOPY, pages); 127 VM_MAYEXEC | VM_DONTCOPY,
128 mm->context.stub_pages);
138 if (err) { 129 if (err) {
139 printk(KERN_ERR "install_special_mapping returned %d\n", err); 130 printk(KERN_ERR "install_special_mapping returned %d\n", err);
140 goto out_free; 131 goto out;
141 } 132 }
142 return; 133 return;
143 134
144out_free:
145 kfree(pages);
146out: 135out:
147 force_sigsegv(SIGSEGV, current); 136 force_sigsegv(SIGSEGV, current);
148} 137}
@@ -151,8 +140,6 @@ void arch_exit_mmap(struct mm_struct *mm)
151{ 140{
152 pte_t *pte; 141 pte_t *pte;
153 142
154 if (mm->context.stub_pages != NULL)
155 kfree(mm->context.stub_pages);
156 pte = virt_to_pte(mm, STUB_CODE); 143 pte = virt_to_pte(mm, STUB_CODE);
157 if (pte != NULL) 144 if (pte != NULL)
158 pte_clear(mm, STUB_CODE, pte); 145 pte_clear(mm, STUB_CODE, pte);