kernel/linux.git/arch/s390/include/asm/ctlreg.h, branch linux-7.0.y

s390: Remove superfluous newlines from inline assemblies

2025-09-29T11:52:08+00:00

Remove superfluous newlines from inline assemblies. Compilers use the number of lines of inline assemblies as heuristic for the complexity and inline decisions. Therefore inline assemblies should only contain as many lines as required. A lot of inline assemblies contain a superfluous newline for the last line. Remove such newlines to improve compiler inlining decisions. Suggested-by: Juergen Christ Signed-off-by: Heiko Carstens Reviewed-by: Alexander Gordeev Reviewed-by: Juergen Christ Signed-off-by: Alexander Gordeev

s390: Replace ASSEMBLY with ASSEMBLER in non-uapi headers

2025-06-16T14:23:02+00:00

While the GCC and Clang compilers already define __ASSEMBLER__ automatically when compiling assembler code, __ASSEMBLY__ is a macro that only gets defined by the Makefiles in the kernel. This is bad since macros starting with two underscores are names that are reserved by the C language. It can also be very confusing for the developers when switching between userspace and kernelspace coding, or when dealing with uapi headers that rather should use __ASSEMBLER__ instead. So let's now standardize on the __ASSEMBLER__ macro that is provided by the compilers. This is a completely mechanical patch (done with a simple "sed -i" statement), with some manual fixups done later while rebasing the patch. Signed-off-by: Thomas Huth Acked-by: Heiko Carstens Link: https://lore.kernel.org/r/20250611140046.137739-3-thuth@redhat.com Signed-off-by: Alexander Gordeev

s390/wti: Introduce infrastructure for warning track interrupt

2024-08-29T20:56:34+00:00

The warning-track interrupt (wti) provides a notification that the receiving CPU will be pre-empted from its physical CPU within a short time frame. This time frame is called grace period and depends on the machine type. Giving up the CPU on time may prevent a task to get stuck while holding a resource. Reviewed-by: Heiko Carstens Reviewed-by: Mete Durlu Signed-off-by: Tobias Huschle Signed-off-by: Vasily Gorbik

s390/ctlreg: return old register contents when changing bits

2023-12-11T13:33:04+00:00

Change local_ctl_set_bit() and local_ctl_clear_bit() so they return the previous value of the to be changed control register. This is useful if a bit is only changed temporarily and the previous content needs to be restored. Reviewed-by: Alexander Gordeev Signed-off-by: Heiko Carstens Signed-off-by: Alexander Gordeev

s390/ctlreg: add control register bits

2023-09-19T11:26:57+00:00

Instead of having only masks for specific bit locations within control registers, also define the bit numbers and use them to define the masks. The bit defines can be used to convert plain numbers to defines. Acked-by: Alexander Gordeev Signed-off-by: Heiko Carstens Signed-off-by: Vasily Gorbik

s390/ctlreg: add missing defines

2023-09-19T11:26:57+00:00

Add a couple of missing control register defines which otherwise would prevent to convert other open-coded usages. Acked-by: Thomas Richter Reviewed-by: Alexander Gordeev Signed-off-by: Heiko Carstens Signed-off-by: Vasily Gorbik

s390/ctlreg: add system_ctl_load()

2023-09-19T11:26:57+00:00

Add system_ctl_load() which can be used to load a value to a control register system wide. Refactor system_ctl_set_clear_bit() so it can handle all different request types, and also rename it to system_ctlreg_modify() Signed-off-by: Heiko Carstens Reviewed-by: Alexander Gordeev Signed-off-by: Vasily Gorbik

s390/ctltreg: make initialization of control register save area explicit

2023-09-19T11:26:56+00:00

Commit e1b9c2749af0 ("s390/smp: ensure global control register contents are in sync") made the control register save area contained within the lowcore at absolute address zero a resource which is used when initializing CPUs. However this is anything but obvious from the code. Add an ctlreg_init_save_area() function in order to make this explicit. Signed-off-by: Heiko Carstens Reviewed-by: Alexander Gordeev Signed-off-by: Vasily Gorbik

s390/ctlreg: add struct ctlreg

2023-09-19T11:26:56+00:00

Add struct ctlreg to enforce strict type checking / usage for control register functions. Reviewed-by: Alexander Gordeev Signed-off-by: Heiko Carstens Signed-off-by: Vasily Gorbik

s390/ctlreg: add type checking to __local_ctl_load() and __local_ctl_store()

2023-09-19T11:26:56+00:00

Add type checking to __local_ctl_load() and __local_ctl_store(). For both functions enforce to pass an array consisting of unsigned longs. Reviewed-by: Alexander Gordeev Signed-off-by: Heiko Carstens Signed-off-by: Vasily Gorbik

kernel/linux.git/arch/s390/include/asm/ctlreg.h, branch linux-7.0.y

s390: Remove superfluous newlines from inline assemblies

s390: Replace __ASSEMBLY__ with __ASSEMBLER__ in non-uapi headers

s390/wti: Introduce infrastructure for warning track interrupt

s390/ctlreg: return old register contents when changing bits

s390/ctlreg: add control register bits

s390/ctlreg: add missing defines

s390/ctlreg: add system_ctl_load()

s390/ctltreg: make initialization of control register save area explicit

s390/ctlreg: add struct ctlreg

s390/ctlreg: add type checking to __local_ctl_load() and __local_ctl_store()

s390: Replace ASSEMBLY with ASSEMBLER in non-uapi headers