6.6-stable review patch. If anyone has any objections, please let me know.
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From: Huacai Chen chenhuacai@loongson.cn
[ Upstream commit 0124fbb4c6dba23dbdf80c829be68adbccde2722 ]
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 --- arch/loongarch/kernel/relocate.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/loongarch/kernel/relocate.c b/arch/loongarch/kernel/relocate.c index 1acfa704c8d0..0eddd4a66b87 100644 --- a/arch/loongarch/kernel/relocate.c +++ b/arch/loongarch/kernel/relocate.c @@ -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);