linux-kernel - Re: [PATCH - 2/2] tip, x86-microcode: refactor microcode output messages

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:	Thu, 26 Nov 2009 10:31:23 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	dimm <dmitry.adamushko@...il.com>
Cc:	Andreas Mohr <andi@...as.de>, linux-kernel@...r.kernel.org,
	Mike Travis <travis@....com>,
	Borislav Petkov <borislav.petkov@....com>
Subject: Re: [PATCH - 2/2] tip, x86-microcode: refactor microcode output
 messages


* dimm <dmitry.adamushko@...il.com> wrote:

> +static int summarize_cpu_range(struct cpumask *range, struct cpu_signature *csig)
> +{
> +	char *cpu_str, *ver_str;
> +	int ret = -1;
> +
> +	cpu_str = kmalloc(128, GFP_KERNEL);
> +	ver_str = kmalloc(128, GFP_KERNEL);
> +	if (!cpu_str || !ver_str)
> +		goto out;
> +
> +	cpulist_scnprintf(cpu_str, 128, range);
> +	microcode_ops->version_snprintf(ver_str, 128, csig);
> +
> +        printk(KERN_INFO "microcode: CPU%s: %s\n", cpu_str, ver_str);
> +	ret = 0;
> +out:
> +	if (cpu_str)
> +		kfree(cpu_str);
> +	if (ver_str)
> +		kfree(ver_str);
> +
> +	return ret;
> +}
> +
> +static void summarize_cpu_info(void)
> +{
> +	struct cpu_info_array_ctx *ctx_array;
> +	cpumask_var_t cpulist;
> +	int base, cpu, ret;
> +
> +	if (!zalloc_cpumask_var(&cpulist, GFP_KERNEL))
> +		return;
> +
> +	ctx_array = kmalloc(nr_cpu_ids * sizeof(*ctx_array), GFP_KERNEL);
> +	if (!ctx_array)
> +		goto out;
> +
> +	ret = on_each_cpu(collect_cpu_info_array, ctx_array, 1);
> +	if (ret)
> +		goto out;
> +
> +	base = cpumask_first(cpu_online_mask);
> +	cpu  = base;
> +	cpumask_set_cpu(cpu, cpulist);
> +
> +	while ((cpu = cpumask_next(cpu, cpu_online_mask)) < nr_cpu_ids) {
> +		if (memcmp(&ctx_array[base].cpu_sig, &ctx_array[cpu].cpu_sig,
> +				sizeof(ctx_array[base].cpu_sig)) != 0) {
> +			summarize_cpu_range(cpulist, &ctx_array[base].cpu_sig);
> +			cpumask_clear(cpulist);
> +			base = cpu;
> +		}
> +		cpumask_set_cpu(cpu, cpulist);
> +	}
> +	summarize_cpu_range(cpulist, &ctx_array[base].cpu_sig);
> +out:
> +	free_cpumask_var(cpulist);
> +	if (ctx_array)
> +		kfree(ctx_array);
> +}

Could we please leave out this summarizing logic (it's bloaty and 
unnecessary), and just print a single line message when applying the 
microcode?

Thanks,

	Ingo
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/