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| author | Michal Clapinski <mclapinski@google.com> | 2026-04-23 14:25:36 +0200 |
|---|---|---|
| committer | Mike Rapoport (Microsoft) <rppt@kernel.org> | 2026-06-01 02:31:37 +0300 |
| commit | bf480c6133461a60e8a4486e560550a20e40ac11 (patch) | |
| tree | 1d415ad964d44cbc25bd57a7fd2ea57ea212eef0 /include/linux | |
| parent | e43ffb69e0438cddd72aaa30898b4dc446f664f8 (diff) | |
| download | lwn-bf480c6133461a60e8a4486e560550a20e40ac11.tar.gz lwn-bf480c6133461a60e8a4486e560550a20e40ac11.zip | |
kho: fix deferred initialization of scratch areas
Currently, if CONFIG_DEFERRED_STRUCT_PAGE_INIT is enabled,
kho_release_scratch() will initialize the struct pages and set migratetype
of KHO scratch. Unless the whole scratch fits below first_deferred_pfn,
some of that will be overwritten either by deferred_init_pages() or
memmap_init_reserved_range().
To fix it, make memmap_init_range(), deferred_init_memmap_chunk() and
__init_page_from_nid() recognize KHO scratch regions and set
migratetype of pageblocks in those regions to MIGRATE_CMA.
Co-developed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Signed-off-by: Michal Clapinski <mclapinski@google.com>
Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Reviewed-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Reviewed-by: Pratyush Yadav (Google) <pratyush@kernel.org>
Link: https://patch.msgid.link/20260423122538.140993-2-mclapinski@google.com
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/memblock.h | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/include/linux/memblock.h b/include/linux/memblock.h index b0f750d22a7b..5afcd99aa8c1 100644 --- a/include/linux/memblock.h +++ b/include/linux/memblock.h @@ -613,11 +613,28 @@ static inline void memtest_report_meminfo(struct seq_file *m) { } #ifdef CONFIG_MEMBLOCK_KHO_SCRATCH void memblock_set_kho_scratch_only(void); void memblock_clear_kho_scratch_only(void); -void memmap_init_kho_scratch_pages(void); +bool memblock_is_kho_scratch_memory(phys_addr_t addr); + +static inline enum migratetype kho_scratch_migratetype(unsigned long pfn, + enum migratetype mt) +{ + if (memblock_is_kho_scratch_memory(PFN_PHYS(pfn))) + return MIGRATE_CMA; + return mt; +} #else static inline void memblock_set_kho_scratch_only(void) { } static inline void memblock_clear_kho_scratch_only(void) { } -static inline void memmap_init_kho_scratch_pages(void) {} +static inline bool memblock_is_kho_scratch_memory(phys_addr_t addr) +{ + return false; +} + +static inline enum migratetype kho_scratch_migratetype(unsigned long pfn, + enum migratetype mt) +{ + return mt; +} #endif #endif /* _LINUX_MEMBLOCK_H */ |