nathan/Chromebook-Device-Nyan-NVIDIA-Tegra-K1-T124-Upstream-Linux-3.10-LTS-Kernel
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Updated from Linux LTS 3.10.25 to 3.10.26

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Nathan
2025-04-09 20:15:34 -05:00
parent 92cb237c3b
commit c205d496ee
118 changed files with 902 additions and 407 deletions
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30
arch/arm64/mm/flush.c
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@@ -77,14 +77,12 @@ void __flush_dcache_page(struct page *page)
void __sync_icache_dcache(pte_t pte, unsigned long addr)
{
unsigned long pfn;
struct page *page;
struct page *page = pte_page(pte);
pfn = pte_pfn(pte);
if (!pfn_valid(pfn))
/* no flushing needed for anonymous pages */
if (!page_mapping(page))
return;
page = pfn_to_page(pfn);
if (!test_and_set_bit(PG_dcache_clean, &page->flags)) {
__flush_dcache_page(page);
__flush_icache_all();
@@ -94,28 +92,14 @@ void __sync_icache_dcache(pte_t pte, unsigned long addr)
}
/*
* Ensure cache coherency between kernel mapping and userspace mapping of this
* page.
* This function is called when a page has been modified by the kernel. Mark
* it as dirty for later flushing when mapped in user space (if executable,
* see __sync_icache_dcache).
*/
void flush_dcache_page(struct page *page)
{
struct address_space *mapping;
/*
* The zero page is never written to, so never has any dirty cache
* lines, and therefore never needs to be flushed.
*/
if (page == ZERO_PAGE(0))
return;
mapping = page_mapping(page);
if (mapping && mapping_mapped(mapping)) {
__flush_dcache_page(page);
__flush_icache_all();
set_bit(PG_dcache_clean, &page->flags);
} else {
if (test_bit(PG_dcache_clean, &page->flags))
clear_bit(PG_dcache_clean, &page->flags);
}
}
EXPORT_SYMBOL(flush_dcache_page);