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Date: Mon, 27 Jul 2026 18:06:38 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Ramin Moussavi <ramin.moussavi@yacoub.de>
Cc: Michal Simek <monstr@monstr.eu>, Mike Rapoport <rppt@kernel.org>,
 linux-kernel@vger.kernel.org
Subject: Re: [PATCH] microblaze: restore the page alignment of
 swapper_pg_dir
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In-Reply-To: <20260727215823.1422701-1-ramin.moussavi@yacoub.de>
References: <20260727215823.1422701-1-ramin.moussavi@yacoub.de>
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On Mon, 27 Jul 2026 23:58:23 +0200 Ramin Moussavi <ramin.moussavi@yacoub.de> wrote:

> microblaze handles TLB misses in software, and the handler builds the
> address of the L1 entry by ORing the index into the page directory base
> instead of adding it (hw_exception_handler.S):
> 

Well that was a convincing changelog.

> 
> Fixes: 6215d9f4470f ("arch, mm: consolidate empty_zero_page")

I'll queue for 7.2-rcX.

> Cc: stable@vger.kernel.org

With this.

> --- a/arch/microblaze/kernel/head.S
> +++ b/arch/microblaze/kernel/head.S
> @@ -39,6 +39,8 @@
>  #include <asm/processor.h>
>  
>  .section .data
> +/* The MMU requires a page aligned page directory. */
> +.align 12
>  .global swapper_pg_dir
>  swapper_pg_dir:
>  	.space	PAGE_SIZE

Thanks.

Hard-coding "12" is a bit sad.  Can we do ".align PAGE_SHIFT" or
similar?