linux-stable.git/arch/s390/kernel/entry.h, branch linux-rolling-stable

s390/idle: Inline update_timer_idle()

2026-02-25T15:46:07+00:00

Inline update_timer_idle() again to avoid an extra function call. This
way the generated code is close to old assembler version again.

Reviewed-by: Sven Schnelle 
Signed-off-by: Heiko Carstens 
Signed-off-by: Vasily Gorbik

s390/traps: Change stack overflow message

2025-03-04T16:34:03+00:00

When the kernel stack pointer is pointing to invalid memory,
a 'Kernel stack overflow' message is printed, which is misleading.
Change the message to actually say that the stack pointer is invalid
instead.

Reviewed-by: Heiko Carstens 
Signed-off-by: Sven Schnelle 
Signed-off-by: Vasily Gorbik

s390/tracing: Enable HAVE_FTRACE_GRAPH_FUNC

2024-12-26T15:50:05+00:00

Add ftrace_graph_func() which is required for fprobe to access registers.
This also eliminates the need for calling prepare_ftrace_return() from
ftrace_caller().

Cc: Alexei Starovoitov 
Cc: Florent Revest 
Cc: Martin KaFai Lau 
Cc: bpf 
Cc: Alexei Starovoitov 
Cc: Jiri Olsa 
Cc: Alan Maguire 
Cc: Mark Rutland 
Link: https://lore.kernel.org/173519002875.391279.7060964632119674159.stgit@devnote2
Signed-off-by: Sven Schnelle 
Acked-by: Heiko Carstens 
Signed-off-by: Steven Rostedt (Google)

s390/switch_to: use generic header file

2024-02-12T14:03:33+00:00

Move the switch_to() implementation to process.c and use the generic
switch_to.h header file instead, like some other architectures.

This addresses also the oddity that the old switch_to() implementation
assigns the return value of __switch_to() to 'prev' instead of 'last',
like it should.

Remove also all includes of switch_to.h from C files, except process.c.

Acked-by: Alexander Gordeev 
Signed-off-by: Heiko Carstens

init: consolidate prototypes in linux/init.h

2023-06-10T00:44:16+00:00

The init/main.c file contains some extern declarations for functions
defined in architecture code, and it defines some other functions that are
called from architecture code with a custom prototype.  Both of those
result in warnings with 'make W=1':

init/calibrate.c:261:37: error: no previous prototype for 'calibrate_delay_is_known' [-Werror=missing-prototypes]
init/main.c:790:20: error: no previous prototype for 'mem_encrypt_init' [-Werror=missing-prototypes]
init/main.c:792:20: error: no previous prototype for 'poking_init' [-Werror=missing-prototypes]
arch/arm64/kernel/irq.c:122:13: error: no previous prototype for 'init_IRQ' [-Werror=missing-prototypes]
arch/arm64/kernel/time.c:55:13: error: no previous prototype for 'time_init' [-Werror=missing-prototypes]
arch/x86/kernel/process.c:935:13: error: no previous prototype for 'arch_post_acpi_subsys_init' [-Werror=missing-prototypes]
init/calibrate.c:261:37: error: no previous prototype for 'calibrate_delay_is_known' [-Werror=missing-prototypes]
kernel/fork.c:991:20: error: no previous prototype for 'arch_task_cache_init' [-Werror=missing-prototypes]

Add prototypes for all of these in include/linux/init.h or another
appropriate header, and remove the duplicate declarations from
architecture specific code.

[sfr@canb.auug.org.au: declare time_init_early()]
  Link: https://lkml.kernel.org/r/20230519124311.5167221c@canb.auug.org.au
Link: https://lkml.kernel.org/r/20230517131102.934196-12-arnd@kernel.org
Signed-off-by: Arnd Bergmann 
Signed-off-by: Stephen Rothwell 
Cc: Boqun Feng 
Cc: Catalin Marinas 
Cc: Christoph Lameter 
Cc: Dennis Zhou 
Cc: Eric Paris 
Cc: Heiko Carstens 
Cc: Helge Deller 
Cc: Ingo Molnar 
Cc: Michael Ellerman 
Cc: Michal Simek 
Cc: Palmer Dabbelt 
Cc: Paul Moore 
Cc: Pavel Machek 
Cc: Peter Zijlstra 
Cc: Rafael J. Wysocki 
Cc: Russell King 
Cc: Tejun Heo 
Cc: Thomas Bogendoerfer 
Cc: Thomas Gleixner 
Cc: Waiman Long 
Cc: Will Deacon 
Signed-off-by: Andrew Morton

s390: move __amode31_base declaration to proper header file

2023-01-13T13:15:07+00:00

Move __amode31_base declaration to proper header file to get rid of

arch/s390/boot/startup.c:24:15:
 warning: symbol '__amode31_base' was not declared. Should it be static?

Signed-off-by: Heiko Carstens

s390: simplify early program check handler

2022-05-25T09:46:02+00:00

Due to historic reasons the base program check handler calls a
configurable function. Given that there is only the early program
check handler left, simplify the code by directly calling that
function.

The only other user was removed with commit d485235b0054 ("s390:
assume diag308 set always works").

Also rename all functions and the asm file to reflect this.

Reviewed-by: Sven Schnelle 
Signed-off-by: Heiko Carstens

s390/extable: move EX_TABLE define to asm-extable.h

2022-03-07T23:33:00+00:00

Follow arm64 and riscv and move the EX_TABLE define to asm-extable.h
which is a lot less generic than the current linkage.h.

Also make sure that all files which contain EX_TABLE usages actually
include the new header file. This should make sure that the files
always compile and there won't be any random compile breakage due to
other header file dependencies.

Reviewed-by: Alexander Gordeev 
Signed-off-by: Heiko Carstens 
Signed-off-by: Vasily Gorbik

s390/boot: allocate amode31 section in decompressor

2021-10-04T07:49:37+00:00

The memory for amode31 section is allocated from the decompressed
kernel. Instead, allocate that memory from the decompressor. This
is a prerequisite to allow initialization of the virtual memory
before the decompressed kernel takes over.

Reviewed-by: Heiko Carstens 
Signed-off-by: Alexander Gordeev 
Signed-off-by: Vasily Gorbik

s390: remove do_signal() prototype and do_notify_resume() function

2021-08-25T09:03:34+00:00

Both are no longer used since the conversion to generic
entry, therefore remove them.

Fixes: 56e62a737028 ("s390: convert to generic entry")
Signed-off-by: Sven Schnelle 
Reviewed-by: Heiko Carstens 
Signed-off-by: Heiko Carstens