linux-kernel - Re: [PATCH] powerpc/fixmap: Fix FIX_EARLY_DEBUG

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Date:   Fri, 26 Jun 2020 14:45:55 +1000 (AEST)
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Paul Mackerras <paulus@...ba.org>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Albert Herranz <albert_herranz@...oo.es>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc/fixmap: Fix FIX_EARLY_DEBUG_BASE when page size is 256k

On Mon, 15 Jun 2020 07:48:25 +0000 (UTC), Christophe Leroy wrote:
> FIX_EARLY_DEBUG_BASE reserves a 128k area for debuging.
> 
> When page size is 256k, the calculation results in a 0 number of
> pages, leading to the following failure:
> 
>   CC      arch/powerpc/kernel/asm-offsets.s
> In file included from ./arch/powerpc/include/asm/nohash/32/pgtable.h:77:0,
>                  from ./arch/powerpc/include/asm/nohash/pgtable.h:8,
>                  from ./arch/powerpc/include/asm/pgtable.h:20,
>                  from ./include/linux/pgtable.h:6,
>                  from ./arch/powerpc/include/asm/kup.h:42,
>                  from ./arch/powerpc/include/asm/uaccess.h:9,
>                  from ./include/linux/uaccess.h:11,
>                  from ./include/linux/crypto.h:21,
>                  from ./include/crypto/hash.h:11,
>                  from ./include/linux/uio.h:10,
>                  from ./include/linux/socket.h:8,
>                  from ./include/linux/compat.h:15,
>                  from arch/powerpc/kernel/asm-offsets.c:14:
> ./arch/powerpc/include/asm/fixmap.h:75:2: error: overflow in enumeration values
>   __end_of_permanent_fixed_addresses,
>   ^
> make[2]: *** [arch/powerpc/kernel/asm-offsets.s] Error 1
> 
> [...]

Applied to powerpc/next.

[1/1] powerpc/fixmap: Fix FIX_EARLY_DEBUG_BASE when page size is 256k
      https://git.kernel.org/powerpc/c/03fd42d458fb9cb69e712600bd69ff77ff3a45a8

cheers