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53fbef56e0
Patch series "Add and use memdesc_flags_t". At some point struct page will be separated from struct slab and struct folio. This is a step towards that by introducing a type for the 'flags' word of all three structures. This gives us a certain amount of type safety by establishing that some of these unsigned longs are different from other unsigned longs in that they contain things like node ID, section number and zone number in the upper bits. That lets us have functions that can be easily called by anyone who has a slab, folio or page (but not easily by anyone else) to get the node or zone. There's going to be some unusual merge problems with this as some odd bits of the kernel decide they want to print out the flags value or something similar by writing page->flags and now they'll need to write page->flags.f instead. That's most of the churn here. Maybe we should be removing these things from the debug output? This patch (of 11): Wrap the unsigned long flags in a typedef. In upcoming patches, this will provide a strong hint that you can't just pass a random unsigned long to functions which take this as an argument. [willy@infradead.org: s/flags/flags.f/ in several architectures] Link: https://lkml.kernel.org/r/aKMgPRLD-WnkPxYm@casper.infradead.org [nicola.vetrini@gmail.com: mips: fix compilation error] Link: https://lore.kernel.org/lkml/CA+G9fYvkpmqGr6wjBNHY=dRp71PLCoi2341JxOudi60yqaeUdg@mail.gmail.com/ Link: https://lkml.kernel.org/r/20250825214245.1838158-1-nicola.vetrini@gmail.com Link: https://lkml.kernel.org/r/20250805172307.1302730-1-willy@infradead.org Link: https://lkml.kernel.org/r/20250805172307.1302730-2-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Acked-by: Zi Yan <ziy@nvidia.com> Cc: Shakeel Butt <shakeel.butt@linux.dev> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
76 lines
1.6 KiB
C
76 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/fs.h>
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#include <linux/pagemap.h>
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#include <linux/syscalls.h>
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#include <linux/spinlock.h>
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#include <asm/page.h>
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#include <asm/cache.h>
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#include <asm/cacheflush.h>
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#include <asm/cachectl.h>
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#include <asm/tlbflush.h>
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#define PG_dcache_clean PG_arch_1
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void flush_dcache_folio(struct folio *folio)
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{
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struct address_space *mapping;
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if (is_zero_pfn(folio_pfn(folio)))
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return;
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mapping = folio_flush_mapping(folio);
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if (mapping && !folio_mapped(folio))
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clear_bit(PG_dcache_clean, &folio->flags.f);
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else {
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dcache_wbinv_all();
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if (mapping)
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icache_inv_all();
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set_bit(PG_dcache_clean, &folio->flags.f);
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}
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}
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EXPORT_SYMBOL(flush_dcache_folio);
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void flush_dcache_page(struct page *page)
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{
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flush_dcache_folio(page_folio(page));
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}
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EXPORT_SYMBOL(flush_dcache_page);
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void update_mmu_cache_range(struct vm_fault *vmf, struct vm_area_struct *vma,
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unsigned long addr, pte_t *ptep, unsigned int nr)
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{
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unsigned long pfn = pte_pfn(*ptep);
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struct folio *folio;
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flush_tlb_page(vma, addr);
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if (!pfn_valid(pfn))
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return;
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if (is_zero_pfn(pfn))
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return;
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folio = page_folio(pfn_to_page(pfn));
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if (!test_and_set_bit(PG_dcache_clean, &folio->flags.f))
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dcache_wbinv_all();
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if (folio_flush_mapping(folio)) {
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if (vma->vm_flags & VM_EXEC)
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icache_inv_all();
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}
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}
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void flush_cache_range(struct vm_area_struct *vma, unsigned long start,
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unsigned long end)
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{
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dcache_wbinv_all();
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if (vma->vm_flags & VM_EXEC)
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icache_inv_all();
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}
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