From 9f744abb4639e793689570fc9dcdf5f2f028bc9a Mon Sep 17 00:00:00 2001 From: Alexander Egorenkov Date: Thu, 25 Mar 2021 12:10:56 +0100 Subject: s390/boot: replace magic string check with a bootdata flag The magic string "S390EP" at offset 0x10008 indicated to the decompressed kernel that it was booted by the decompressor. Introduce a new bootdata flag instead which conveys the same information in an explicit and a cleaner way. But keep the magic string because it is a kernel ABI. Signed-off-by: Alexander Egorenkov Reviewed-by: Vasily Gorbik Signed-off-by: Vasily Gorbik --- arch/s390/kernel/early.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'arch/s390/kernel/early.c') diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c index c2cf79d353cf..fb84e3fc1686 100644 --- a/arch/s390/kernel/early.c +++ b/arch/s390/kernel/early.c @@ -33,6 +33,8 @@ #include #include "entry.h" +int __bootdata(is_full_image); + static void __init reset_tod_clock(void) { union tod_clock clk; @@ -279,7 +281,7 @@ static void __init setup_boot_command_line(void) static void __init check_image_bootable(void) { - if (!memcmp(EP_STRING, (void *)EP_OFFSET, strlen(EP_STRING))) + if (is_full_image) return; sclp_early_printk("Linux kernel boot failure: An attempt to boot a vmlinux ELF image failed.\n"); -- cgit