Kill get/put_cpu_ptr

Someone asked for this in the list...
Against rc3-mm2, compiled and booted:

@@ -24,8 +24,7 @@
 

/*
* Use this to get to a cpu's version of the per-cpu object allocated using
- * alloc_percpu. If you want to get "this cpu's version", maybe you want
- * to use get_cpu_ptr... + * alloc_percpu.
*/
#define per_cpu_ptr(ptr, cpu) \
({ \
@@ -58,26 +57,4 @@

#define alloc_percpu(type) \
	((type *)(__alloc_percpu(sizeof(type), __alignof__(type))))

-/* - * Use these with alloc_percpu. If
- * 1. You want to operate on memory allocated by alloc_percpu (dereference

- *    and read/modify/write)  AND - * 2. You want "this cpu's version" of the object AND - * 3. You want to do this safely since:
- *    a. On multiprocessors, you don't want to switch between cpus after - *    you've read the current processor id due to preemption -- this would - *    take away the implicit  advantage to not have any kind of traditional - *    serialization for per-cpu data
- *    b. On uniprocessors, you don't want another kernel thread messing
- *    up with the same per-cpu data due to preemption
- *    - * So, Use get_cpu_ptr to disable preemption and get pointer to the - * local cpu version of the per-cpu object. Use put_cpu_ptr to enable

- * preemption. Operations on per-cpu data between get_ and put_ is
- * then considered to be safe. And ofcourse, "Thou shalt not sleep between - * get_cpu_ptr and put_cpu_ptr"
- */
-#define get_cpu_ptr(ptr) per_cpu_ptr(ptr, get_cpu())
-#define put_cpu_ptr(ptr) put_cpu()
-
#endif /* __LINUX_PERCPU_H */

diff -ruN linux-2.6.9-rc3-mm2-cln/mm/slab.c linux-2.6.9-rc3-mm2/mm/slab.c
@@ -2435,8 +2435,7 @@

/**
* __alloc_percpu - allocate one copy of the object for every present
* cpu in the system, zeroing them.
- * Objects should be dereferenced using per_cpu_ptr/get_cpu_ptr
- * macros only.
+ * Objects should be dereferenced using per_cpu_ptr macro only. *
* @size: how many bytes of memory are required.
* @align: the alignment, which can't be greater than SMP_CACHE_BYTES.

--
J.A. Magallon <jamagallon()able!es> \ Software is like sex:
werewolf!able!es \ It's better when it's free
Mandrakelinux release 10.1 (Community) for i586
Linux 2.6.9-rc3-mm2 (gcc 3.4.1 (Mandrakelinux 10.1 3.4.1-4mdk)) #1