kernel.git/arch/s390/boot, branch linux-6.15.y

s390/boot: Fix startup debugging log

2025-08-15T10:17:01Z

[ Upstream commit e29409faec87ffd2de2ed20b6109f303f129281b ] Fix 'kernel image' end address for kaslr case. Fixes: ec6f9f7e5bbf ("s390/boot: Add startup debugging support") Reviewed-by: Alexander Gordeev Signed-off-by: Mikhail Zaslonko Signed-off-by: Heiko Carstens Signed-off-by: Alexander Gordeev Signed-off-by: Sasha Levin

s390: Use inline qualifier for all EX_TABLE and ALTERNATIVE inline assemblies

2025-03-18T16:13:51Z

Use asm_inline for all inline assemblies which make use of the EX_TABLE or ALTERNATIVE macros. These macros expand to many lines and the compiler assumes the number of lines within an inline assembly is the same as the number of instructions within an inline assembly. This has an effect on inlining and loop unrolling decisions. In order to avoid incorrect assumptions use asm_inline, which tells the compiler that an inline assembly has the smallest possible size. In order to avoid confusion when asm_inline should be used or not, since a couple of inline assemblies are quite large: the rule is to always use asm_inline whenever the EX_TABLE or ALTERNATIVE macro is used. In specific cases there may be reasons to not follow this guideline, but that should be documented with the corresponding code. Using the inline qualifier everywhere has only a small effect on the kernel image size: add/remove: 0/10 grow/shrink: 19/8 up/down: 1492/-1858 (-366) The only location where this seems to matter is load_unaligned_zeropad() from word-at-a-time.h where the compiler inlines more functions within the dcache code, which is indeed code where performance matters. Suggested-by: Juergen Christ Reviewed-by: Juergen Christ Signed-off-by: Heiko Carstens Signed-off-by: Vasily Gorbik

s390/boot: Ignore vmlinux.map

2025-03-18T16:13:05Z

When building with CONFIG_VMLINUX_MAP=y, a decompressor vmlinux.map file is generated in the boot directory. Add this file to .gitignore to ensure Git does not track it. Signed-off-by: WangYuli Link: https://lore.kernel.org/r/F884C733016D6715+20250311030824.675683-1-wangyuli@uniontech.com Acked-by: Vasily Gorbik Signed-off-by: Vasily Gorbik

s390/boot: Convert __diag308() to extable

2025-03-04T16:34:03Z

Shorten __diag308() and use regular EX_TABLE program check handling. Acked-by: Alexander Gordeev Signed-off-by: Heiko Carstens Signed-off-by: Vasily Gorbik

s390/boot: Convert detect_diag9c() to extable

2025-03-04T16:34:03Z

Shorten detect_diag9c() and use regular EX_TABLE program check handling. Acked-by: Alexander Gordeev Signed-off-by: Heiko Carstens Signed-off-by: Vasily Gorbik

s390/boot: Convert diag500_storage_limit() to extable

2025-03-04T16:34:02Z

Shorten diag500_storage_limit() and use regular EX_TABLE program check handling. Acked-by: Alexander Gordeev Signed-off-by: Heiko Carstens Signed-off-by: Vasily Gorbik

s390/boot: Convert tprot() to extable

2025-03-04T16:34:02Z

Shorten tprot() and use regular EX_TABLE program check handling. Acked-by: Alexander Gordeev Signed-off-by: Heiko Carstens Signed-off-by: Vasily Gorbik

s390/boot: Convert __diag260() to extable

2025-03-04T16:34:02Z

Shorten __diag260() and use regular EX_TABLE program check handling. Acked-by: Alexander Gordeev Signed-off-by: Heiko Carstens Signed-off-by: Vasily Gorbik

s390/boot: Convert cmma_test_essa() to extable

2025-03-04T16:33:40Z

Shorten cmma_test_essa() and use regular EX_TABLE program check handling. Acked-by: Alexander Gordeev Signed-off-by: Heiko Carstens Signed-off-by: Vasily Gorbik

s390/boot: Add exception table support

2025-03-04T16:25:22Z

The early boot code contains various open-coded inline assemblies with exception handling. In order to handle possible exceptions each of them changes the program check new psw, and restores it. In order to simplify the various inline assemblies add simple exception table support: the program check handler is called with a fully populated pt_regs on the stack and may change the psw and register members. When the program check handler returns the psw and registers from pt_regs will be used to continue execution. The program check handler searches the exception table for an entry which matches the address of the program check. If such an entry is found the psw address within pt_regs on the stack is replaced with a fixup address, and execution continues at the new address. If no entry is found the psw is changed to a disabled wait psw and execution stops. Before entering the C part of the program check handler the address of the program check new psw is replaced to a minimalistic handler. This is supposed to help against program check loops. If an exception happens while in program check processing the register contents of the original exception are restored and a disabled wait psw is loaded. Acked-by: Alexander Gordeev Signed-off-by: Heiko Carstens Signed-off-by: Vasily Gorbik