Messages in this thread Patch in this message | | | From | Ankur Arora <> | Subject | [PATCH v2 9/9] x86/clear_huge_page: make clear_contig_region() preemptible | Date | Wed, 30 Aug 2023 11:49:58 -0700 |
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clear_contig_region() can be used for clearing regions as large as a gigantic page. Allow preemption in irqentry_exit to make sure we don't hold on to the CPU for an arbitrarily long period.
Signed-off-by: Ankur Arora <ankur.a.arora@oracle.com> --- arch/x86/mm/hugetlbpage.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/arch/x86/mm/hugetlbpage.c b/arch/x86/mm/hugetlbpage.c index 0b9f7a6dad93..55d1d15ea618 100644 --- a/arch/x86/mm/hugetlbpage.c +++ b/arch/x86/mm/hugetlbpage.c @@ -152,7 +152,12 @@ hugetlb_get_unmapped_area(struct file *file, unsigned long addr, #ifndef CONFIG_HIGHMEM static void clear_contig_region(struct page *page, unsigned int npages) { + /* + * We might be clearing a large region. Allow rescheduling. + */ + allow_resched(); clear_pages(page_address(page), npages); + disallow_resched(); } /* -- 2.31.1
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