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U2FsdGVkX1/TRzEfgvl1V9l35b6bKeJJiqKoyXmHMf6r2DC9iyqeCBBhwco67ptbqkgrEfqHocv8ryzPFxc/70EV8h6TNi7xMZNlyoMha05zkrZtrQ6UeK+9ZgON0Kx0lKWmEUXUx+wwicolDOaLFKo3khSy09XbseRlug9+ajApV7EAifthDcW9RbYmYqCWdQgNvmyXZfgerFkm8mN9VSA5M3QGpF3Kq4PhVI+b/P0S9z1iQe4eelN++LqIdwk24178lIETlHhX4PdlVA1dqqxCXLBvg2jnPYdFvcgyv31jBPXBY42pk6FO5WVgvs1ol4uH/Fd3VHhXY3eQY3frZVyqBBQlggxvmaptsY6BmwGfqNqNVdM3FmyD0LxQYxUYUBlmkBNSQvFskOvXnndUfhYP6ybSyjRfX+widSwkJ5WbT/DDwGY1wJgfi4ewjbqadg0xa8HUskDvz2mNzKdvNZRNiZEN+t4Eq6jv3MPSUoznvOH3ngaiPRhgZ9sQmUv9Z3KRzejJxi49a6eEx1gszTF/ub1bCjMYaFWzPUJVKvuXF/dPL0g2d5ngD9sJ/3mzqzwMq4FKKWtPwIEq32YAjUNrYO0ywivqPwIF40Xg6oLqTJquBYRN4wVXFw89B+5d335e6WTOxibOvEPT4p3Y3PP8O/LwYgwtNe04CqFZQS5sub+XXLpO1e22yiW8mPy6Ctz9DtsZ9CuJG4YPBcJCM0DsZSpdUjaxH7Ya1TM3aHKqs1+vzExx8BftiEZK2LMcM5bflU/AeWc0gprwYWSIBtXInm/BXhYmVxrzRA6qRjiNQoDfQphyJalxH7gTFt+2BPzhLSBzwnh+iMeV1y3px8InLM/dGxhRBDvmFf3XDMwtvxva+37Ft5CkIBXokc5vfw/+7kRU3+w8xxNJ1PlLV3T8cNzqEqcyfXlKCtxp6DuAXinlJDNBChyYHqCTYwQJd4SxQykR6gjeEZabxpB 0AtjuJlO vWU1iiYt5KoNiCUUaX3phuReuRcW2deu3ewUtWGvoJ3CAERkn19IQ8jXu3fvdJrnCpfNtZB3Qfguk+Ela70IpURcFQPmX+8oSkgyfT/DRj6v02OXFl2MGaPjIkGz36BB5P/bqVOyzsdArNHRnDqhFHakOXL/OV4iSG3a9L8bWN90rzV+gy7jirCWV2jzOy6Bnk/euzkUiN/BXjsUCG6bilNT8eFfsvUOHlKZdAc8CC6h1qjYvUwGJQ82h7/2JXmGx/uItn0ma7dkjwHjnd2gRJQtA9DGCmXBmN9OCw/ZSUX5hDcGn30LgHUVtwab8/crcWza0c7mQWzk8aRpOCNv56f9akCilymR0BB+13aOLvq6UiS8HzkPq5X5lVhapB5VI8K2zBbV78nB4zp9yD7hA8xSdw0pAVE/oCJVBrad51g5qRhwT2QSfTXA7M9BUzCm1RUxd/pCbstX+ijbH8w240ws6opYHspcEsEGxftARyMNP/0o= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed, Jul 22, 2026 at 03:56:05PM -0700, Nathan Chancellor wrote: > Hi Mark and drm and mm folks, > Typically to get drm_pagemap.c to compile on various configs this is what is needed: 109 #ifdef CONFIG_PGTABLE_HAS_HUGE_LEAVES 110 #define HPAGE_PMD_SHIFT PMD_SHIFT 111 #define HPAGE_PUD_SHIFT PUD_SHIFT 112 #else 113 #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; }) 114 #define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; }) 115 #endif So the drm_pagemap.c code could be: -#if IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION) +#if IS_ENABLED(CONFIG_PGTABLE_HAS_HUGE_LEAVES) #define DRM_PAGEMAP_PMD_ORDER HPAGE_PMD_ORDER #else #define DRM_PAGEMAP_PMD_ORDER (-1) This Kconfig has been around since 2024: git format-patch -1 b979db1611a63 Would it be better for everyone for me to change this in the DRM branches? Matt > There is a semantic conflict between commit 04b177544a04 ("drm/pagemap: > Guard HPAGE_PMD_ORDER use with CONFIG_ARCH_ENABLE_THP_MIGRATION") in the > drm-misc-fixes tree and commit 0b6b1bb28482 ("mm: rename > ARCH_ENABLE_THP_MIGRATION to ARCH_HAS_PMD_SOFTLEAVES"), resulting in a > lone instance of CONFIG_ARCH_ENABLE_THP_MIGRATION with no way to define > it. > > $ git grep ARCH_ENABLE_THP_MIGRATION > Next/merge.log:Merging drm-misc-fixes/for-linux-next-fixes (04b177544a040 drm/pagemap: Guard HPAGE_PMD_ORDER use with CONFIG_ARCH_ENABLE_THP_MIGRATION) > drivers/gpu/drm/drm_pagemap.c:#if IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION) > > This results in an objtool warning (or error with CONFIG_OBJTOOL_WERROR) > when building with clang because NR_PAGES(order) results in 1U << -1, > which causes clang to stop generating code for > drm_pagemap_migrate_to_devmem() when encountering unconditional > undefined behavior. > > drivers/gpu/drm/drm_gpusvm_helper.o: error: objtool: drm_pagemap_migrate_to_devmem() falls through to next function drm_pagemap_zdd_alloc() > > Mark, could please apply the following diff to the -mm merge to avoid > this? Obviously, there will need to be further coordination for > resolving this upstream when the time comes but it is only an issue in > -next currently. > > diff --git a/drivers/gpu/drm/drm_pagemap.c b/drivers/gpu/drm/drm_pagemap.c > index 4a794544b7dc..f00c27edbfb9 100644 > --- a/drivers/gpu/drm/drm_pagemap.c > +++ b/drivers/gpu/drm/drm_pagemap.c > @@ -12,7 +12,7 @@ > #include > #include > > -#if IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION) > +#if IS_ENABLED(CONFIG_ARCH_HAS_PMD_SOFTLEAVES) > #define DRM_PAGEMAP_PMD_ORDER HPAGE_PMD_ORDER > #else > #define DRM_PAGEMAP_PMD_ORDER (-1) > -- > Cheers, > Nathan