On 2023/10/23 19:46, Krzysztof Kozlowski wrote:
On 23/10/2023 13:43, Zhenhua Huang wrote:
+
+ mem_dump_apply_offset(&dump_vaddr, &phys_addr,
+ size + QCOM_DUMP_DATA_SIZE);
+ if (phys_addr > phys_end_addr) {
+ dev_err_probe(dev, -ENOMEM, "Exceeding allocated region\n");
ENOMEM? Does not look right then.
ENOMEM means the memory allocated not enough? any suggestion? Thanks.
The error code is okay, but we rarely need to print error messages for
memory allocation failures. Core prints it already.
It's not same as below case. Allocation is successful here, while the
driver used more than allocated size.
+ return -ENOMEM;
+ }
+ } else {
+ continue;
+ }
+ }
+
+ return ret;
+}
+
+static int __init mem_dump_probe(struct platform_device *pdev)
+{
+ struct qcom_memory_dump *memdump;
+ struct device *dev = &pdev->dev;
+ struct page *page;
+ size_t total_size;
+ int ret = 0;
+
+ memdump = devm_kzalloc(dev, sizeof(struct qcom_memory_dump),
+ GFP_KERNEL);
+ if (!memdump)
+ return -ENOMEM;
+
+ dev_set_drvdata(dev, memdump);
+
+ /* check and initiate CMA region */
+ ret = mem_dump_reserve_mem(dev);
+ if (ret)
+ return ret;
+
+ /* allocate and populate */
+ page = mem_dump_alloc_mem(dev, &total_size);
+ if (IS_ERR(page)) {
+ ret = PTR_ERR(page);
+ dev_err_probe(dev, ret, "mem dump alloc failed\n");
No, the syntax is:
ret = dev_err_probe
But why do you print messgaes for memory allocations?
Do you think it's useless because mm codes should print error as well if
failure ?
We fixed this in kernel long, long, long time ago so we have even
coccicheck scripts to find misuses.
Thanks, yeah.. I know mm codes already have for example warn_alloc() to
print error messages. Thanks for pointing out.
Best regards,
Krzysztof
Thanks,
Zhenhua
