linux-kernel - Re: [PATCH 0/3] zram: Replace pr_* with dev

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Date:	Fri, 7 Aug 2015 15:56:11 +0900
From:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:	Minchan Kim <minchan@...nel.org>
Cc:	Salah Triki <salah.triki@....org>, ngupta@...are.org,
	linux-kernel@...r.kernel.org,
	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Subject: Re: [PATCH 0/3] zram: Replace pr_* with dev_*

On (08/07/15 15:37), Sergey Senozhatsky wrote:
[..]
> we now have errors like
>  'zram: Cannot initialise lzo compressing backend'
> 
> and they will transform into
> 
>  'block zram0: Cannot initialise lzo compressing backend'
> 
> note the prefix 'zram:' became 'block zram0:'

but it doesn't come for free. where we had clean and nice

pr_err("Decompression failed!...
pr_info("Unable to allocate temp memory\n"...
etc...

now we have monsters

dev_err(disk_to_dev(zram->disk), "Decompression failed!...
dev_info(disk_to_dev(zram->disk), "Unable to allocate temp memory\n"...
etc.


other changes are very questionable... for example

   pr_info("Added device: %s\n", zram->disk->disk_name);
becomes
   dev_info(disk_to_dev(zram->disk), "Added device: %s\n", zram->disk->disk_name);


why? there is no reason to do this!



and messages are converted in a bit random manner, shall I say. so now
we have a mix of dev_* and pr_* errors. to convert them all to dev_* (which
is not possible in all the cases) we would need to change some function
prototypes and start passing zram pointer, or disk...

example:

static struct zram_meta *zram_meta_alloc(int device_id, u64 disksize)
{
        size_t num_pages;
        char pool_name[8];
        struct zram_meta *meta = kmalloc(sizeof(*meta), GFP_KERNEL);

        if (!meta)
                return NULL;

        num_pages = disksize >> PAGE_SHIFT;
        meta->table = vzalloc(num_pages * sizeof(*meta->table));
        if (!meta->table) {
                pr_err("Error allocating zram address table\n");
                goto out_error;
        }

        snprintf(pool_name, sizeof(pool_name), "zram%d", device_id);
        meta->mem_pool = zs_create_pool(pool_name, GFP_NOIO | __GFP_HIGHMEM);
        if (!meta->mem_pool) {
                pr_err("Error creating memory pool\n");
                goto out_error;
        }
...



so I see a little value. really. too much things to change.

	-ss
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