linux-kernel - Re: [PATCH v3 08/12] ppc64/kexec_file: setup the stack for purgatory

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Message-ID: <87wo348cg2.fsf@morokweng.localdomain>
Date:   Wed, 15 Jul 2020 22:40:13 -0300
From:   Thiago Jung Bauermann <bauerman@...ux.ibm.com>
To:     Hari Bathini <hbathini@...ux.ibm.com>
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Pingfan Liu <piliu@...hat.com>,
        Kexec-ml <kexec@...ts.infradead.org>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        Nayna Jain <nayna@...ux.ibm.com>,
        Petr Tesarik <ptesarik@...e.cz>,
        Mahesh J Salgaonkar <mahesh@...ux.ibm.com>,
        Sourabh Jain <sourabhjain@...ux.ibm.com>,
        lkml <linux-kernel@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...abs.org>,
        Eric Biederman <ebiederm@...ssion.com>,
        Dave Young <dyoung@...hat.com>, Vivek Goyal <vgoyal@...hat.com>
Subject: Re: [PATCH v3 08/12] ppc64/kexec_file: setup the stack for purgatory


Sorry, forgot to send one comment for this patch:

Hari Bathini <hbathini@...ux.ibm.com> writes:

> @@ -898,10 +900,37 @@ int setup_purgatory_ppc64(struct kimage *image, const void *slave_code,
>  			goto out;
>  	}
>
> +	/* Setup the stack top */
> +	stack_buf = kexec_purgatory_get_symbol_addr(image, "stack_buf");
> +	if (!stack_buf)
> +		goto out;
> +
> +	val = (u64)stack_buf + KEXEC_PURGATORY_STACK_SIZE;
> +	ret = kexec_purgatory_get_set_symbol(image, "stack", &val, sizeof(val),
> +					     false);
> +	if (ret)
> +		goto out;
> +
>  	/* Setup the TOC pointer */
>  	val = get_toc_ptr(&(image->purgatory_info));
>  	ret = kexec_purgatory_get_set_symbol(image, "my_toc", &val, sizeof(val),
>  					     false);
> +	if (ret)
> +		goto out;
> +
> +	/* Setup OPAL base & entry values */
> +	dn = of_find_node_by_path("/ibm,opal");
> +	if (dn) {
> +		of_property_read_u64(dn, "opal-base-address", &val);
> +		ret = kexec_purgatory_get_set_symbol(image, "opal_base", &val,
> +						     sizeof(val), false);
> +		if (ret)
> +			goto out;
> +
> +		of_property_read_u64(dn, "opal-entry-address", &val);
> +		ret = kexec_purgatory_get_set_symbol(image, "opal_entry", &val,
> +						     sizeof(val), false);

You need to call of_node_put(dn) here and in the if (ret) case above.

> +	}
>  out:
>  	if (ret)
>  		pr_err("Failed to setup purgatory symbols");

--
Thiago Jung Bauermann
IBM Linux Technology Center