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Message-ID: <202601030906.9lgtN5Gq-lkp@intel.com>
Date: Sat, 3 Jan 2026 10:19:47 +0800
From: kernel test robot <lkp@...el.com>
To: Jordan Niethe <jniethe@...dia.com>, linux-mm@...ck.org
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev, balbirs@...dia.com,
matthew.brost@...el.com, akpm@...ux-foundation.org,
linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
david@...hat.com, ziy@...dia.com, apopple@...dia.com,
lorenzo.stoakes@...cle.com, lyude@...hat.com, dakr@...nel.org,
airlied@...il.com, simona@...ll.ch, rcampbell@...dia.com,
mpenttil@...hat.com, jgg@...dia.com, willy@...radead.org,
linuxppc-dev@...ts.ozlabs.org, intel-xe@...ts.freedesktop.org,
jgg@...pe.ca, Felix.Kuehling@....com
Subject: Re: [PATCH v1 8/8] mm: Remove device private pages from the physical
address space
Hi Jordan,
kernel test robot noticed the following build warnings:
[auto build test WARNING on f8f9c1f4d0c7a64600e2ca312dec824a0bc2f1da]
url: https://github.com/intel-lab-lkp/linux/commits/Jordan-Niethe/mm-migrate_device-Add-migrate-PFN-flag-to-track-device-private-pages/20251231-123453
base: f8f9c1f4d0c7a64600e2ca312dec824a0bc2f1da
patch link: https://lore.kernel.org/r/20251231043154.42931-9-jniethe%40nvidia.com
patch subject: [PATCH v1 8/8] mm: Remove device private pages from the physical address space
config: s390-allnoconfig (https://download.01.org/0day-ci/archive/20260103/202601030906.9lgtN5Gq-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project f43d6834093b19baf79beda8c0337ab020ac5f17)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260103/202601030906.9lgtN5Gq-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202601030906.9lgtN5Gq-lkp@intel.com/
All warnings (new ones prefixed by >>):
In file included from arch/s390/purgatory/purgatory.c:10:
In file included from include/linux/kexec.h:18:
In file included from include/linux/vmcore_info.h:6:
In file included from include/linux/elfcore.h:11:
In file included from include/linux/ptrace.h:10:
In file included from include/linux/pid_namespace.h:7:
In file included from include/linux/mm.h:33:
>> include/linux/memremap.h:148:2: warning: field '' with variable sized type 'union dev_pagemap::(anonymous at include/linux/memremap.h:148:2)' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
148 | union {
| ^
1 warning generated.
vim +148 include/linux/memremap.h
514caf23a70fd6 Christoph Hellwig 2019-06-26 113
9476df7d80dfc4 Dan Williams 2016-01-15 114 /**
9476df7d80dfc4 Dan Williams 2016-01-15 115 * struct dev_pagemap - metadata for ZONE_DEVICE mappings
4b94ffdc4163ba Dan Williams 2016-01-15 116 * @altmap: pre-allocated/reserved memory for vmemmap allocations
5c2c2587b13235 Dan Williams 2016-01-15 117 * @ref: reference count that pins the devm_memremap_pages() mapping
b80892ca022e9e Christoph Hellwig 2021-10-28 118 * @done: completion for @ref
0c32c9f7a58e77 John Groves 2024-02-05 119 * @type: memory type: see MEMORY_* above in memremap.h
514caf23a70fd6 Christoph Hellwig 2019-06-26 120 * @flags: PGMAP_* flags to specify defailed behavior
c4386bd8ee3a92 Joao Martins 2022-01-14 121 * @vmemmap_shift: structural definition of how the vmemmap page metadata
c4386bd8ee3a92 Joao Martins 2022-01-14 122 * is populated, specifically the metadata page order.
c4386bd8ee3a92 Joao Martins 2022-01-14 123 * A zero value (default) uses base pages as the vmemmap metadata
c4386bd8ee3a92 Joao Martins 2022-01-14 124 * representation. A bigger value will set up compound struct pages
c4386bd8ee3a92 Joao Martins 2022-01-14 125 * of the requested order value.
1e240e8d4a7d92 Christoph Hellwig 2019-06-26 126 * @ops: method table
f894ddd5ff01d3 Christoph Hellwig 2020-03-16 127 * @owner: an opaque pointer identifying the entity that manages this
f894ddd5ff01d3 Christoph Hellwig 2020-03-16 128 * instance. Used by various helpers to make sure that no
f894ddd5ff01d3 Christoph Hellwig 2020-03-16 129 * foreign ZONE_DEVICE memory is accessed.
0386df765967ce Jordan Niethe 2025-12-31 130 * @nr_range: number of ranges to be mapped. Always == 1 for
0386df765967ce Jordan Niethe 2025-12-31 131 * MEMORY_DEVICE_PRIVATE.
0386df765967ce Jordan Niethe 2025-12-31 132 * @range: range to be mapped when nr_range == 1. Used as an output param for
0386df765967ce Jordan Niethe 2025-12-31 133 * MEMORY_DEVICE_PRIVATE.
b7b3c01b191596 Dan Williams 2020-10-13 134 * @ranges: array of ranges to be mapped when nr_range > 1
0386df765967ce Jordan Niethe 2025-12-31 135 * @nr_pages: number of pages requested to be mapped for MEMORY_DEVICE_PRIVATE.
0386df765967ce Jordan Niethe 2025-12-31 136 * @pages: array of nr_pages initialized for MEMORY_DEVICE_PRIVATE.
9476df7d80dfc4 Dan Williams 2016-01-15 137 */
9476df7d80dfc4 Dan Williams 2016-01-15 138 struct dev_pagemap {
e7744aa25cffe2 Logan Gunthorpe 2017-12-29 139 struct vmem_altmap altmap;
b80892ca022e9e Christoph Hellwig 2021-10-28 140 struct percpu_ref ref;
24917f6b1041a7 Christoph Hellwig 2019-06-26 141 struct completion done;
5042db43cc26f5 Jérôme Glisse 2017-09-08 142 enum memory_type type;
514caf23a70fd6 Christoph Hellwig 2019-06-26 143 unsigned int flags;
c4386bd8ee3a92 Joao Martins 2022-01-14 144 unsigned long vmemmap_shift;
1e240e8d4a7d92 Christoph Hellwig 2019-06-26 145 const struct dev_pagemap_ops *ops;
f894ddd5ff01d3 Christoph Hellwig 2020-03-16 146 void *owner;
b7b3c01b191596 Dan Williams 2020-10-13 147 int nr_range;
b7b3c01b191596 Dan Williams 2020-10-13 @148 union {
b7b3c01b191596 Dan Williams 2020-10-13 149 struct range range;
06919d226d0113 Gustavo A. R. Silva 2022-09-03 150 DECLARE_FLEX_ARRAY(struct range, ranges);
b7b3c01b191596 Dan Williams 2020-10-13 151 };
0386df765967ce Jordan Niethe 2025-12-31 152 unsigned long nr_pages;
0386df765967ce Jordan Niethe 2025-12-31 153 struct page *pages;
9476df7d80dfc4 Dan Williams 2016-01-15 154 };
9476df7d80dfc4 Dan Williams 2016-01-15 155
--
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