linux-kernel - Re: [PATCH v3] arch/sparc: support NR

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Date:   Tue, 06 Jun 2017 16:42:02 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     jane.chu@...cle.com
Cc:     tglx@...utronix.de, bob.picco@...cle.com,
        steven.sistare@...cle.com, atish.patra@...cle.com,
        Liam.Howlett@...cle.com, sparclinux@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] arch/sparc: support NR_CPUS = 4096

From: Jane Chu <jane.chu@...cle.com>
Date: Tue,  6 Jun 2017 14:32:29 -0600

> Linux SPARC64 limits NR_CPUS to 4064 because init_cpu_send_mondo_info()
> only allocates a single page for NR_CPUS mondo entries. Thus we cannot
> use all 4096 CPUs on some SPARC platforms.
> 
> To fix, allocate (2^order) pages where order is set according to the size
> of cpu_list for possible cpus. Since cpu_list_pa and cpu_mondo_block_pa
> are not used in asm code, there are no imm13 offsets from the base PA
> that will break because they can only reach one page.
> 
> Orabug: 25505750
> 
> Signed-off-by: Jane Chu <jane.chu@...cle.com>
> 
> Reviewed-by: Bob Picco <bob.picco@...cle.com>
> Reviewed-by: Atish Patra <atish.patra@...cle.com>

Looks a lot better, applied, thanks!