projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 9e953cda AG |
1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | #include <linux/hugetlb.h> | |
| 3 | #include <linux/err.h> | |
| 4 | ||
| 5 | int pud_huge(pud_t pud) | |
| 6 | { | |
| 7 | return pud_present(pud) && | |
| 8 | (pud_val(pud) & (_PAGE_READ | _PAGE_WRITE | _PAGE_EXEC)); | |
| 9 | } | |
| 10 | ||
| 11 | int pmd_huge(pmd_t pmd) | |
| 12 | { | |
| 13 | return pmd_present(pmd) && | |
| 14 | (pmd_val(pmd) & (_PAGE_READ | _PAGE_WRITE | _PAGE_EXEC)); | |
| 15 | } | |
| 16 | ||
| 17 | static __init int setup_hugepagesz(char *opt) | |
| 18 | { | |
| 19 | unsigned long ps = memparse(opt, &opt); | |
| 20 | ||
| 21 | if (ps == HPAGE_SIZE) { | |
| 22 | hugetlb_add_hstate(HPAGE_SHIFT - PAGE_SHIFT); | |
| 23 | } else if (IS_ENABLED(CONFIG_64BIT) && ps == PUD_SIZE) { | |
| 24 | hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT); | |
| 25 | } else { | |
| 26 | hugetlb_bad_size(); | |
| 27 | pr_err("hugepagesz: Unsupported page size %lu M\n", ps >> 20); | |
| 28 | return 0; | |
| 29 | } | |
| 30 | ||
| 31 | return 1; | |
| 32 | } | |
| 33 | __setup("hugepagesz=", setup_hugepagesz); | |
| 34 | ||
| 35 | #ifdef CONFIG_CONTIG_ALLOC | |
| 36 | static __init int gigantic_pages_init(void) | |
| 37 | { | |
| 38 | /* With CONTIG_ALLOC, we can allocate gigantic pages at runtime */ | |
| 39 | if (IS_ENABLED(CONFIG_64BIT) && !size_to_hstate(1UL << PUD_SHIFT)) | |
| 40 | hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT); | |
| 41 | return 0; | |
| 42 | } | |
| 43 | arch_initcall(gigantic_pages_init); | |
| 44 | #endif |