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authorNicolas Pitre <nicolas.pitre@linaro.org>2011-08-25 00:24:21 -0400
committerNicolas Pitre <nico@fluxnic.net>2011-11-18 13:51:22 -0500
commitbe9b7335e70696bee731c152429b1737e42fe163 (patch)
tree46b48be6c58d4ff7b2b1d2a59f0d81cd5646a0ed
parent55a8173cfe1c6b489f8f5705282c762aed2e265e (diff)
mm: add vm_area_add_early()
The existing vm_area_register_early() allows for early vmalloc space allocation. However upcoming cleanups in the ARM architecture require that some fixed locations in the vmalloc area be reserved also very early. The name "vm_area_register_early" would have been a good name for the reservation part without the allocation. Since it is already in use with different semantics, let's create vm_area_add_early() instead. Both vm_area_register_early() and vm_area_add_early() can be used together meaning that the former is now implemented using the later where it is ensured that no conflicting areas are added, but no attempt is made to make the allocation scheme in vm_area_register_early() more sophisticated. After all, you must know what you're doing when using those functions. Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org> Acked-by: Andrew Morton <akpm@linux-foundation.org> Cc: linux-mm@kvack.org
-rw-r--r--include/linux/vmalloc.h1
-rw-r--r--mm/vmalloc.c29
2 files changed, 28 insertions, 2 deletions
diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
index 687fb11e2010..4115d6aa80be 100644
--- a/include/linux/vmalloc.h
+++ b/include/linux/vmalloc.h
@@ -131,6 +131,7 @@ extern long vwrite(char *buf, char *addr, unsigned long count);
*/
extern rwlock_t vmlist_lock;
extern struct vm_struct *vmlist;
+extern __init void vm_area_add_early(struct vm_struct *vm);
extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
#ifdef CONFIG_SMP
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index b669aa6f6caf..3f2b59221b78 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -1118,6 +1118,32 @@ void *vm_map_ram(struct page **pages, unsigned int count, int node, pgprot_t pro
EXPORT_SYMBOL(vm_map_ram);
/**
+ * vm_area_add_early - add vmap area early during boot
+ * @vm: vm_struct to add
+ *
+ * This function is used to add fixed kernel vm area to vmlist before
+ * vmalloc_init() is called. @vm->addr, @vm->size, and @vm->flags
+ * should contain proper values and the other fields should be zero.
+ *
+ * DO NOT USE THIS FUNCTION UNLESS YOU KNOW WHAT YOU'RE DOING.
+ */
+void __init vm_area_add_early(struct vm_struct *vm)
+{
+ struct vm_struct *tmp, **p;
+
+ BUG_ON(vmap_initialized);
+ for (p = &vmlist; (tmp = *p) != NULL; p = &tmp->next) {
+ if (tmp->addr >= vm->addr) {
+ BUG_ON(tmp->addr < vm->addr + vm->size);
+ break;
+ } else
+ BUG_ON(tmp->addr + tmp->size > vm->addr);
+ }
+ vm->next = *p;
+ *p = vm;
+}
+
+/**
* vm_area_register_early - register vmap area early during boot
* @vm: vm_struct to register
* @align: requested alignment
@@ -1139,8 +1165,7 @@ void __init vm_area_register_early(struct vm_struct *vm, size_t align)
vm->addr = (void *)addr;
- vm->next = vmlist;
- vmlist = vm;
+ vm_area_add_early(vm);
}
void __init vmalloc_init(void)