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Date: Thu, 10 Mar 2022 10:52:52 +0100
From: Borislav Petkov <bp@...en8.de>
To: linux-edac <linux-edac@...r.kernel.org>
Cc: LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 3/5] EDAC/device: Get rid of the silly one-shot memory allocation in edac_device_alloc_ctl_info()
From: Borislav Petkov <bp@...e.de>
Use boring kzalloc() instead. Add pointers to the different allocated
members in struct edac_device_ctl_info for easier freeing later.
One of the reasons, perhaps, why it was done this way is to be able to
do a single kfree(ctl_info) without having to kfree() the other parts of
the struct too but that is not nearly a sensible reason as to why there
should be this obscure pointer alignment.
There should be no functional changes resulting from this.
Signed-off-by: Borislav Petkov <bp@...e.de>
---
drivers/edac/edac_device.c | 109 ++++++++++++-------------------
drivers/edac/edac_device.h | 14 ++++
drivers/edac/edac_device_sysfs.c | 5 +-
3 files changed, 57 insertions(+), 71 deletions(-)
diff --git a/drivers/edac/edac_device.c b/drivers/edac/edac_device.c
index 8c4d947fb848..3c91156bbd27 100644
--- a/drivers/edac/edac_device.c
+++ b/drivers/edac/edac_device.c
@@ -59,87 +59,59 @@ struct edac_device_ctl_info *edac_device_alloc_ctl_info(
struct edac_device_instance *dev_inst, *inst;
struct edac_device_block *dev_blk, *blk_p, *blk;
struct edac_dev_sysfs_block_attribute *dev_attrib, *attrib_p, *attrib;
- unsigned total_size;
- unsigned count;
unsigned instance, block, attr;
- void *pvt, *p;
+ void *pvt;
int err;
edac_dbg(4, "instances=%d blocks=%d\n", nr_instances, nr_blocks);
- /* Calculate the size of memory we need to allocate AND
- * determine the offsets of the various item arrays
- * (instance,block,attrib) from the start of an allocated structure.
- * We want the alignment of each item (instance,block,attrib)
- * to be at least as stringent as what the compiler would
- * provide if we could simply hardcode everything into a single struct.
- */
- p = NULL;
- dev_ctl = edac_align_ptr(&p, sizeof(*dev_ctl), 1);
+ dev_ctl = kzalloc(sizeof(struct edac_device_ctl_info), GFP_KERNEL);
+ if (!dev_ctl)
+ return NULL;
- /* Calc the 'end' offset past end of ONE ctl_info structure
- * which will become the start of the 'instance' array
- */
- dev_inst = edac_align_ptr(&p, sizeof(*dev_inst), nr_instances);
+ dev_inst = kmalloc_array(nr_instances,
+ sizeof(struct edac_device_instance),
+ GFP_KERNEL | __GFP_ZERO);
+ if (!dev_inst)
+ goto free;
- /* Calc the 'end' offset past the instance array within the ctl_info
- * which will become the start of the block array
- */
- count = nr_instances * nr_blocks;
- dev_blk = edac_align_ptr(&p, sizeof(*dev_blk), count);
+ dev_ctl->instances = dev_inst;
- /* Calc the 'end' offset past the dev_blk array
- * which will become the start of the attrib array, if any.
- */
- /* calc how many nr_attrib we need */
- if (nr_attrib > 0)
- count *= nr_attrib;
- dev_attrib = edac_align_ptr(&p, sizeof(*dev_attrib), count);
+ dev_blk = kmalloc_array(nr_instances * nr_blocks,
+ sizeof(struct edac_device_block),
+ GFP_KERNEL | __GFP_ZERO);
+ if (!dev_blk)
+ goto free;
- /* Calc the 'end' offset past the attributes array */
- pvt = edac_align_ptr(&p, sz_private, 1);
+ dev_ctl->blocks = dev_blk;
- /* 'pvt' now points to where the private data area is.
- * At this point 'pvt' (like dev_inst,dev_blk and dev_attrib)
- * is baselined at ZERO
- */
- total_size = ((unsigned long)pvt) + sz_private;
+ if (nr_attrib) {
+ dev_attrib = kmalloc_array(nr_attrib,
+ sizeof(struct edac_dev_sysfs_block_attribute),
+ GFP_KERNEL | __GFP_ZERO);
+ if (!dev_attrib)
+ goto free;
- /* Allocate the amount of memory for the set of control structures */
- dev_ctl = kzalloc(total_size, GFP_KERNEL);
- if (dev_ctl == NULL)
- return NULL;
+ dev_ctl->attribs = dev_attrib;
+ }
- /* Adjust pointers so they point within the actual memory we
- * just allocated rather than an imaginary chunk of memory
- * located at address 0.
- * 'dev_ctl' points to REAL memory, while the others are
- * ZERO based and thus need to be adjusted to point within
- * the allocated memory.
- */
- dev_inst = (struct edac_device_instance *)
- (((char *)dev_ctl) + ((unsigned long)dev_inst));
- dev_blk = (struct edac_device_block *)
- (((char *)dev_ctl) + ((unsigned long)dev_blk));
- dev_attrib = (struct edac_dev_sysfs_block_attribute *)
- (((char *)dev_ctl) + ((unsigned long)dev_attrib));
- pvt = sz_private ? (((char *)dev_ctl) + ((unsigned long)pvt)) : NULL;
-
- /* Begin storing the information into the control info structure */
- dev_ctl->dev_idx = device_index;
- dev_ctl->nr_instances = nr_instances;
- dev_ctl->instances = dev_inst;
- dev_ctl->pvt_info = pvt;
+ if (sz_private) {
+ pvt = kzalloc(sz_private, GFP_KERNEL);
+ if (!pvt)
+ goto free;
+
+ dev_ctl->pvt_info = pvt;
+ }
+
+ dev_ctl->dev_idx = device_index;
+ dev_ctl->nr_instances = nr_instances;
/* Default logging of CEs and UEs */
dev_ctl->log_ce = 1;
dev_ctl->log_ue = 1;
/* Name of this edac device */
- snprintf(dev_ctl->name,sizeof(dev_ctl->name),"%s",edac_device_name);
-
- edac_dbg(4, "edac_dev=%p next after end=%p\n",
- dev_ctl, pvt + sz_private);
+ snprintf(dev_ctl->name, sizeof(dev_ctl->name),"%s", edac_device_name);
/* Initialize every Instance */
for (instance = 0; instance < nr_instances; instance++) {
@@ -210,10 +182,8 @@ struct edac_device_ctl_info *edac_device_alloc_ctl_info(
* Initialize the 'root' kobj for the edac_device controller
*/
err = edac_device_register_sysfs_main_kobj(dev_ctl);
- if (err) {
- kfree(dev_ctl);
- return NULL;
- }
+ if (err)
+ goto free;
/* at this point, the root kobj is valid, and in order to
* 'free' the object, then the function:
@@ -223,6 +193,11 @@ struct edac_device_ctl_info *edac_device_alloc_ctl_info(
*/
return dev_ctl;
+
+free:
+ __edac_device_free_ctl_info(dev_ctl);
+
+ return NULL;
}
EXPORT_SYMBOL_GPL(edac_device_alloc_ctl_info);
diff --git a/drivers/edac/edac_device.h b/drivers/edac/edac_device.h
index fc2d2c218064..3f44e6b9d387 100644
--- a/drivers/edac/edac_device.h
+++ b/drivers/edac/edac_device.h
@@ -216,6 +216,8 @@ struct edac_device_ctl_info {
*/
u32 nr_instances;
struct edac_device_instance *instances;
+ struct edac_device_block *blocks;
+ struct edac_dev_sysfs_block_attribute *attribs;
/* Event counters for the this whole EDAC Device */
struct edac_device_counter counters;
@@ -348,4 +350,16 @@ edac_device_handle_ue(struct edac_device_ctl_info *edac_dev, int inst_nr,
*/
extern int edac_device_alloc_index(void);
extern const char *edac_layer_name[];
+
+/* Free the actual struct */
+static inline void __edac_device_free_ctl_info(struct edac_device_ctl_info *ci)
+{
+ if (ci) {
+ kfree(ci->pvt_info);
+ kfree(ci->attribs);
+ kfree(ci->blocks);
+ kfree(ci->instances);
+ kfree(ci);
+ }
+}
#endif
diff --git a/drivers/edac/edac_device_sysfs.c b/drivers/edac/edac_device_sysfs.c
index 5e7593753799..e748a5addd38 100644
--- a/drivers/edac/edac_device_sysfs.c
+++ b/drivers/edac/edac_device_sysfs.c
@@ -207,10 +207,7 @@ static void edac_device_ctrl_master_release(struct kobject *kobj)
/* decrement the EDAC CORE module ref count */
module_put(edac_dev->owner);
- /* free the control struct containing the 'main' kobj
- * passed in to this routine
- */
- kfree(edac_dev);
+ __edac_device_free_ctl_info(edac_dev);
}
/* ktype for the main (master) kobject */
--
2.29.2
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