linux-kernel - Re: [PATCH] powerpc: align address to page boundary in change_page

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Message-Id: <165261053145.1047019.10970993413033058326.b4-ty@ellerman.id.au>
Date:   Sun, 15 May 2022 20:28:51 +1000
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Christophe Leroy <christophe.leroy@...roup.eu>,
        Michael Ellerman <mpe@...erman.id.au>,
        Paul Mackerras <paulus@...ba.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc: align address to page boundary in change_page_attr()

On Mon, 21 Mar 2022 16:44:45 +0100, Christophe Leroy wrote:
> Aligning address to page boundary allows flush_tlb_kernel_range()
> to know it's a single page flush and use tlbie instead of tlbia.
> 
> On 603 we now have the following code in first leg of
> change_page_attr():
> 
> 	  2c:	55 29 00 3c 	rlwinm  r9,r9,0,0,30
> 	  30:	91 23 00 00 	stw     r9,0(r3)
> 	  34:	7c 00 22 64 	tlbie   r4,r0
> 	  38:	7c 00 04 ac 	hwsync
> 	  3c:	38 60 00 00 	li      r3,0
> 	  40:	4e 80 00 20 	blr
> 
> [...]

Applied to powerpc/next.

[1/1] powerpc: align address to page boundary in change_page_attr()
      https://git.kernel.org/powerpc/c/65883b78bc9f49ac891bb202c59fcb76b9cfc611

cheers