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LoongArch: Use correct API to map cmdline in relocate_kernel()

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[ Upstream commit 0124fbb4c6 ]

fw_arg1 is in memory space rather than I/O space, so we should use
early_memremap_ro() instead of early_ioremap() to map the cmdline.
Moreover, we should unmap it after using.

Suggested-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Huacai Chen 2024-07-20 22:41:07 +08:00 committed by Greg Kroah-Hartman
parent 52d9d4f33b
commit 4794579335
1 changed files with 3 additions and 1 deletions
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4
arch/loongarch/kernel/relocate.c
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@ -13,6 +13,7 @@
#include <asm/bootinfo.h>
#include <asm/early_ioremap.h>
#include <asm/inst.h>
#include <asm/io.h>
#include <asm/sections.h>
#include <asm/setup.h>
@ -170,7 +171,7 @@ unsigned long __init relocate_kernel(void)
unsigned long kernel_length;
unsigned long random_offset = 0;
void *location_new = _text; /* Default to original kernel start */
char *cmdline = early_ioremap(fw_arg1, COMMAND_LINE_SIZE); /* Boot command line is passed in fw_arg1 */
char *cmdline = early_memremap_ro(fw_arg1, COMMAND_LINE_SIZE); /* Boot command line is passed in fw_arg1 */
strscpy(boot_command_line, cmdline, COMMAND_LINE_SIZE);
@ -182,6 +183,7 @@ unsigned long __init relocate_kernel(void)
random_offset = (unsigned long)location_new - (unsigned long)(_text);
#endif
reloc_offset = (unsigned long)_text - VMLINUX_LOAD_ADDRESS;
early_memunmap(cmdline, COMMAND_LINE_SIZE);
if (random_offset) {
kernel_length = (long)(_end) - (long)(_text);