mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
synced 2026-10-28 12:53:14 +01:00
Guo Weikang
ccd582059a
The early_ioremap interface can fail and return NULL in certain cases. To prevent NULL-pointer dereference crashes, fixed issues in the acpi_extlog and copy_early_mem interfaces, improving robustness when handling early memory. Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Guo Weikang <[email protected]> Cc: Ard Biesheuvel <[email protected]> Cc: Arnd Bergmann <[email protected]> Cc: Baoquan He <[email protected]> Cc: Borislav Petkov (AMD) <[email protected]> Cc: Dave Hansen <[email protected]> Cc: H. Peter Anvin <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Jason A. Donenfeld <[email protected]> Cc: Julian Stecklina <[email protected]> Cc: Kevin Loughlin <[email protected]> Cc: Len Brown <[email protected]> Cc: Rafael J. Wysocki <[email protected]> Cc: "Rafael J. Wysocki" <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Xin Li (Intel) <[email protected]> Signed-off-by: Andrew Morton <[email protected]>
48 lines
1.5 KiB
C
48 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_EARLY_IOREMAP_H_
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#define _ASM_EARLY_IOREMAP_H_
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#include <linux/types.h>
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/*
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* early_ioremap() and early_iounmap() are for temporary early boot-time
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* mappings, before the real ioremap() is functional.
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*/
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extern void __iomem *early_ioremap(resource_size_t phys_addr,
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unsigned long size);
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extern void *early_memremap(resource_size_t phys_addr,
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unsigned long size);
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extern void *early_memremap_ro(resource_size_t phys_addr,
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unsigned long size);
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extern void *early_memremap_prot(resource_size_t phys_addr,
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unsigned long size, unsigned long prot_val);
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extern void early_iounmap(void __iomem *addr, unsigned long size);
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extern void early_memunmap(void *addr, unsigned long size);
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#if defined(CONFIG_GENERIC_EARLY_IOREMAP) && defined(CONFIG_MMU)
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/* Arch-specific initialization */
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extern void early_ioremap_init(void);
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/* Generic initialization called by architecture code */
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extern void early_ioremap_setup(void);
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/*
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* Called as last step in paging_init() so library can act
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* accordingly for subsequent map/unmap requests.
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*/
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extern void early_ioremap_reset(void);
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/*
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* Early copy from unmapped memory to kernel mapped memory.
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*/
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extern int copy_from_early_mem(void *dest, phys_addr_t src,
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unsigned long size);
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#else
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static inline void early_ioremap_init(void) { }
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static inline void early_ioremap_setup(void) { }
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static inline void early_ioremap_reset(void) { }
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#endif
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#endif /* _ASM_EARLY_IOREMAP_H_ */
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