linux-kernel - mainline build failure due to 322458c2bb1a ("drm/ttm: Reduce the number of used allocation orders for TTM pages")

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Message-ID: <ZEljCgVFnDl/C+l3@debian>
Date:   Wed, 26 Apr 2023 18:44:42 +0100
From:   "Sudip Mukherjee (Codethink)" <sudipm.mukherjee@...il.com>
To:     Thomas Hellström 
        <thomas.hellstrom@...ux.intel.com>,
        Christian Koenig <christian.koenig@....com>,
        Huang Rui <ray.huang@....com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: mainline build failure due to 322458c2bb1a ("drm/ttm: Reduce the
 number of used allocation orders for TTM pages")

Hi All,

The latest mainline kernel branch fails to build powerpc allmodconfig
with the error:


drivers/gpu/drm/ttm/ttm_pool.c:73:29: error: variably modified 'global_write_combined' at file scope
   73 | static struct ttm_pool_type global_write_combined[TTM_DIM_ORDER];
      |                             ^~~~~~~~~~~~~~~~~~~~~
drivers/gpu/drm/ttm/ttm_pool.c:74:29: error: variably modified 'global_uncached' at file scope
   74 | static struct ttm_pool_type global_uncached[TTM_DIM_ORDER];
      |                             ^~~~~~~~~~~~~~~
drivers/gpu/drm/ttm/ttm_pool.c:76:29: error: variably modified 'global_dma32_write_combined' at file scope
   76 | static struct ttm_pool_type global_dma32_write_combined[TTM_DIM_ORDER];
      |                             ^~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/gpu/drm/ttm/ttm_pool.c:77:29: error: variably modified 'global_dma32_uncached' at file scope
   77 | static struct ttm_pool_type global_dma32_uncached[TTM_DIM_ORDER];
      |                             ^~~~~~~~~~~~~~~~~~~~~


git bisect pointed to 322458c2bb1a ("drm/ttm: Reduce the number of used allocation orders for TTM pages")

I will be happy to test any patch or provide any extra log if needed.


-- 
Regards
Sudip