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From: Madhavan Srinivasan <maddy@linux.ibm.com>
To: Michael Ellerman <mpe@ellerman.id.au>,
	Nicholas Piggin <npiggin@gmail.com>,
	Naveen N Rao <naveen@kernel.org>,
	Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH] powerpc/8xx: Reduce alignment constraint for kernel memory
Date: Sun, 18 May 2025 09:14:12 +0530	[thread overview]
Message-ID: <174753967071.24504.9586296033974318959.b4-ty@linux.ibm.com> (raw)
In-Reply-To: <fa9927b70df13627cdf10b992ea71d6562c7760e.1746191262.git.christophe.leroy@csgroup.eu>

On Fri, 02 May 2025 15:07:53 +0200, Christophe Leroy wrote:
> 8xx has three large page sizes: 8M, 512k and 16k.
> 
> A too big alignment can lead to wasting memory. On a board which has
> only 32 MBytes of RAM, every single byte is worth it and a 512k
> alignment is sometimes too much.
> 
> Allow mapping kernel memory with 16k pages and reduce the constraint
> on kernel memory alignment. 512k and 16k pages are handled the same
> way so reverse tests in order to make 8M pages the special case and
> other ones (512k and 16k) the alternative.
> 
> [...]

Applied to powerpc/next.

[1/1] powerpc/8xx: Reduce alignment constraint for kernel memory
      https://git.kernel.org/powerpc/c/f9cb1476ade41ba859e6f41323e76284b297d7c2

Thanks

      reply	other threads:[~2025-05-18  3:44 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-05-02 13:07 Christophe Leroy
2025-05-18  3:44 ` Madhavan Srinivasan [this message]

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