linux-kernel - Re: [BUG] allmodconfig build error in next-20240108

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Date: Tue, 9 Jan 2024 09:57:57 +1100
From: Stephen Rothwell <sfr@...b.auug.org.au>
To: "Paul E. McKenney" <paulmck@...nel.org>
Cc: lucas.dimarchi@...el.com, ogabbay@...nel.org,
 thomas.hellstrom@...ux.intel.com, linux-kernel@...r.kernel.org,
 intel-xe@...ts.freedesktop.org
Subject: Re: [BUG] allmodconfig build error in next-20240108

Hi Paul,

On Mon, 8 Jan 2024 13:33:36 -0800 "Paul E. McKenney" <paulmck@...nel.org> wrote:
>
> Recent -next trees get the following build error for allmodconfig builds:
> 
> ------------------------------------------------------------------------
> 
> drivers/gpu/drm/xe/xe_gt_pagefault.c: In function ‘xe_guc_pagefault_handler’:
> ./include/linux/fortify-string.h:57:33: error: writing 16 bytes into a region of  size 0 [-Werror=stringop-overflow=]
>    57 | #define __underlying_memcpy     __builtin_memcpy
>       |                                 ^
> ./include/linux/fortify-string.h:644:9: note: in expansion of macro ‘__underlying_memcpy’
>   644 |         __underlying_##op(p, q, __fortify_size); \
>       |         ^~~~~~~~~~~~~
> ./include/linux/fortify-string.h:689:26: note: in expansion of macro ‘__fortify_memcpy_chk’
>   689 | #define memcpy(p, q, s)  __fortify_memcpy_chk(p, q, s, \
>       |                          ^~~~~~~~~~~~~~~~~~~~
> drivers/gpu/drm/xe/xe_gt_pagefault.c:340:17: note: in expansion of macro ‘memcpy’
>   340 |                 memcpy(pf_queue->data + pf_queue->tail, msg, len * sizeof(u32));
>       |                 ^~~~~~
> In file included from drivers/gpu/drm/xe/xe_device_types.h:17,
>                  from drivers/gpu/drm/xe/xe_vm_types.h:16,
>                  from drivers/gpu/drm/xe/xe_bo.h:13,
>                  from drivers/gpu/drm/xe/xe_gt_pagefault.c:16:
> drivers/gpu/drm/xe/xe_gt_types.h:102:25: note: at offset [1144, 265324] into destination object ‘tile’ of size 8
>   102 |         struct xe_tile *tile;
>       |

Which architecture?  What compiler and version?  Anything special in your build
setup?  I do x86_64 allmodconfig builds all day with gcc v13.2 and I don't see
this failure.

-- 
Cheers,
Stephen Rothwell

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