All of lore.kernel.org
 help / color / mirror / Atom feed
From: catalin.marinas@arm.com (Catalin Marinas)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] arm64: mm: Create gigabyte kernel logical mappings where possible
Date: Fri, 2 May 2014 09:51:21 +0100	[thread overview]
Message-ID: <20140502085119.GA456@arm.com> (raw)
In-Reply-To: <1398857782-1525-1-git-send-email-steve.capper@linaro.org>

On Wed, Apr 30, 2014 at 12:36:22PM +0100, Steve Capper wrote:
> diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
> index 4d29332..867e979 100644
> --- a/arch/arm64/mm/mmu.c
> +++ b/arch/arm64/mm/mmu.c
> @@ -234,7 +234,20 @@ static void __init alloc_init_pud(pgd_t *pgd, unsigned long addr,
>  	pud = pud_offset(pgd, addr);
>  	do {
>  		next = pud_addr_end(addr, end);
> -		alloc_init_pmd(pud, addr, next, phys);
> +
> +		/*
> +		 * For 4K granule only, attempt to put down a 1GB block
> +		 */
> +		if ((PAGE_SHIFT == 12) &&
> +			((addr | next | phys) & ~PUD_MASK) == 0) {
> +			pud_t old_pud = *pud;
> +			set_pud(pud, __pud(phys | prot_sect_kernel));
> +
> +			if (!pud_none(old_pud))
> +				flush_tlb_all();

We could even free the original pmd here. I think a
memblock_free(pud_pfn(old_pud) << PAGE_SHIFT, PAGE_SIZE) should do
(untested, and you need to define pud_pfn).

-- 
Catalin

  parent reply	other threads:[~2014-05-02  8:51 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-04-30 11:36 [PATCH] arm64: mm: Create gigabyte kernel logical mappings where possible Steve Capper
2014-04-30 18:11 ` Arnd Bergmann
2014-05-01  8:54   ` Steve Capper
2014-05-01 13:36     ` Arnd Bergmann
2014-05-01 16:20       ` Steve Capper
2014-05-02  1:03 ` Jungseok Lee
2014-05-02  9:11   ` Steve Capper
2014-05-02  8:51 ` Catalin Marinas [this message]
2014-05-02  9:21   ` Steve Capper

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20140502085119.GA456@arm.com \
    --to=catalin.marinas@arm.com \
    --cc=linux-arm-kernel@lists.infradead.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.