can someone tell me why should i use PAGE_ALIGN after kmalloc?

["calix" <calix.chen@xxxxxxxxx>]

 

Here is a example :

/////

    capsule_header_array[capsule_index] = (efi_capsule_header_t *)kmalloc (

                                                                                capsule_header_size + PAGE_SIZE, GFP_KERNEL);

                                                if (capsule_header_array[capsule_index] == NULL) {

                                                                printk(KERN_ALERT "!!!! Oops - constructcapsuleheaderarray() malloc 0x%08x fail !!!!\n",

                                                                (unsigned int)(capsule_header_size + PAGE_SIZE));

                                                                return -1;

                                                }

                                                //

                                                // make it page aligned

                                                //

                                                capsule_header_array[capsule_index] = (efi_capsule_header_t *) \

                                                                                (unsigned long)PAGE_ALIGN((unsigned long)capsule_header_array[capsule_index]);

////////////////////////

 

 

Thanks for any help~！

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Best Regards!

make a difference.

Calix