修改GPIO导出默认初始值

hc

2024-10-16 50a212ec906f7524620675f0c57357691c26c81f

 kernel/arch/arc/mm/highmem.c
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@@ -1,17 +1,13 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Copyright (C) 2015 Synopsys, Inc. (www.synopsys.com)
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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- *
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  */
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-#include <linux/bootmem.h>
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+#include <linux/memblock.h>
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 #include <linux/export.h>
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 #include <linux/highmem.h>
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+#include <linux/pgtable.h>
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 #include <asm/processor.h>
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-#include <asm/pgtable.h>
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 #include <asm/pgalloc.h>
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 #include <asm/tlbflush.h>
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13
 
..
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@@ -53,38 +49,23 @@
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 extern pte_t * pkmap_page_table;
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 static pte_t * fixmap_page_table;
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51
 
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-void *kmap(struct page *page)
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-{
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-	BUG_ON(in_interrupt());
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-	if (!PageHighMem(page))
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-		return page_address(page);
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-
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-	return kmap_high(page);
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-}
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-EXPORT_SYMBOL(kmap);
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-
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-void *kmap_atomic(struct page *page)
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+void *kmap_atomic_high_prot(struct page *page, pgprot_t prot)
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 {
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 	int idx, cpu_idx;
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 	unsigned long vaddr;
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-
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-	preempt_disable();
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-	pagefault_disable();
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-	if (!PageHighMem(page))
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-		return page_address(page);
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 	cpu_idx = kmap_atomic_idx_push();
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 	idx = cpu_idx + KM_TYPE_NR * smp_processor_id();
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 	vaddr = FIXMAP_ADDR(idx);
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 	set_pte_at(&init_mm, vaddr, fixmap_page_table + idx,
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-		   mk_pte(page, kmap_prot));
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+		   mk_pte(page, prot));
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 	return (void *)vaddr;
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 }
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-EXPORT_SYMBOL(kmap_atomic);
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+EXPORT_SYMBOL(kmap_atomic_high_prot);
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-void __kunmap_atomic(void *kv)
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+void kunmap_atomic_high(void *kv)
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 {
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 	unsigned long kvaddr = (unsigned long)kv;
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..
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@@ -106,24 +87,19 @@
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 		kmap_atomic_idx_pop();
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 	}
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-
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-	pagefault_enable();
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-	preempt_enable();
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 }
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-EXPORT_SYMBOL(__kunmap_atomic);
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+EXPORT_SYMBOL(kunmap_atomic_high);
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 static noinline pte_t * __init alloc_kmap_pgtable(unsigned long kvaddr)
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 {
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-	pgd_t *pgd_k;
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-	pud_t *pud_k;
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-	pmd_t *pmd_k;
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+	pmd_t *pmd_k = pmd_off_k(kvaddr);
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 	pte_t *pte_k;
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-	pgd_k = pgd_offset_k(kvaddr);
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-	pud_k = pud_offset(pgd_k, kvaddr);
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-	pmd_k = pmd_offset(pud_k, kvaddr);
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+	pte_k = (pte_t *)memblock_alloc_low(PAGE_SIZE, PAGE_SIZE);
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+	if (!pte_k)
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+		panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
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+		      __func__, PAGE_SIZE, PAGE_SIZE);
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-	pte_k = (pte_t *)alloc_bootmem_low_pages(PAGE_SIZE);
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 	pmd_populate_kernel(&init_mm, pmd_k, pte_k);
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 	return pte_k;
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 }