linux-kernel - Re: [PATCH] pstore: Refactor compression initialization

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Date:   Thu, 18 Oct 2018 10:14:19 -0700
From:   Joe Perches <joe@...ches.com>
To:     Kees Cook <keescook@...omium.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pstore: Refactor compression initialization

On Wed, 2018-10-17 at 14:41 -0700, Kees Cook wrote:
> With compression initialization now separated from pstore_register(),
> there is no longer a good reason to do compression method selection
> during fs init. Instead, merge everything together into the late init.
> Additionally cleans up the reporting to be more clear.
[]
> diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
[]
> @@ -274,36 +274,56 @@ static int pstore_decompress(void *in, void *out,
[]
> -	big_oops_buf = kmalloc(big_oops_buf_sz, GFP_KERNEL);
> -	if (!big_oops_buf) {
> -		pr_err("allocate compression buffer error!\n");
> +	buf = kmalloc(size, GFP_KERNEL);
> +	if (!buf) {
> +		pr_err("Failed %d byte compression buffer allocation for: %s\n",
> +		       size, zbackend->name);

Given that there is a generic OOM message emitted on
kmalloc failures, rather than expanding the unnecessary
alloc failure message, how about just deleting it instead?