linux-kernel - Re: [PATCH v3 05/12] powerpc/drmem: make lmb walk a bit more flexible

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Date:   Wed, 15 Jul 2020 00:50:35 -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 05/12] powerpc/drmem: make lmb walk a bit more flexible


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

> @@ -534,7 +537,7 @@ static int __init early_init_dt_scan_memory_ppc(unsigned long node,
>  #ifdef CONFIG_PPC_PSERIES
>  	if (depth == 1 &&
>  	    strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0) {
> -		walk_drmem_lmbs_early(node, early_init_drmem_lmb);
> +		walk_drmem_lmbs_early(node, NULL, early_init_drmem_lmb);

walk_drmem_lmbs_early() can now fail. Should this failure be propagated
as a return value of early_init_dt_scan_memory_ppc()?

>  		return 0;
>  	}
>  #endif
<snip>

> @@ -787,7 +790,7 @@ static int __init parse_numa_properties(void)
>  	 */
>  	memory = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory");
>  	if (memory) {
> -		walk_drmem_lmbs(memory, numa_setup_drmem_lmb);
> +		walk_drmem_lmbs(memory, NULL, numa_setup_drmem_lmb);

Similarly here. Now that this call can fail, should
parse_numa_properties() handle or propagate the failure?

>  		of_node_put(memory);
>  	}
>


--
Thiago Jung Bauermann
IBM Linux Technology Center