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0dafe9968a
linux/arch/s390/kernel
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Heiko Carstens 0dafe9968a s390: Use inline qualifier for all EX_TABLE and ALTERNATIVE inline assemblies 
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 <jchrist@linux.ibm.com>
Reviewed-by: Juergen Christ <jchrist@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
2025-03-18 17:13:51 +01:00
..
diag s390: Use inline qualifier for all EX_TABLE and ALTERNATIVE inline assemblies 2025-03-18 17:13:51 +01:00
syscalls s390 updates for 6.13 merge window 2024-11-18 17:45:41 -08:00
vdso32 s390/vdso: Drop LBASE_VDSO 2024-11-02 12:37:32 +01:00
vdso64 s390/Kconfig: Select VMAP_STACK unconditionally 2024-12-10 15:41:58 +01:00
.gitignore
abs_lowcore.c s390/lowcore: Convert relocated lowcore alternative to machine feature 2025-03-04 17:18:05 +01:00
alternative.c s390/alternatives: Add debug functionality 2025-03-04 17:18:08 +01:00
asm-offsets.c s390/boot: Pass pt_regs to program check handler 2025-03-04 17:25:22 +01:00
audit.c audit: add support for the openat2 syscall 2021-10-01 16:52:48 -04:00
audit.h
cache.c s390/cache: prevent rebuild of shared_cpu_list 2024-03-07 14:41:15 +01:00
cert_store.c s390: Use inline qualifier for all EX_TABLE and ALTERNATIVE inline assemblies 2025-03-18 17:13:51 +01:00
compat_audit.c audit: add support for the openat2 syscall 2021-10-01 16:52:48 -04:00
compat_linux.c
compat_linux.h s390/compat: cleanup compat_linux.h header file 2022-05-06 20:45:16 +02:00
compat_ptrace.h
compat_signal.c s390/vdso: Move vdso symbol handling to separate header file 2024-09-13 17:28:36 +02:00
cpacf.c s390/crypto/cpacf: Constify 'struct bin_attribute' 2025-01-07 10:05:35 +01:00
cpcmd.c s390/cpcmd: Convert to use flag output macros 2024-11-13 14:31:32 +01:00
cpufeature.c s390/uvdevice: autoload module based on CPU facility 2022-07-19 16:18:49 +02:00
crash_dump.c virtio: features, fixes, cleanups 2025-01-27 15:26:06 -08:00
ctlreg.c s390/ctlreg: add system_ctl_load() 2023-09-19 13:26:57 +02:00
debug.c treewide: const qualify ctl_tables where applicable 2025-01-28 13:48:37 +01:00
dis.c s390/disassembler: Remove duplicate instruction format RSY_RDRU 2024-09-12 14:13:27 +02:00
dumpstack.c s390: Replace S390_lowcore by get_lowcore() 2024-06-18 17:01:33 +02:00
early_printk.c s390/early: Dump register contents and call trace for early crashes 2024-08-22 19:28:11 +02:00
early.c s390/alternatives: Add debug functionality 2025-03-04 17:18:08 +01:00
ebcdic.c s390/ebcdic: fix typo in comment 2023-07-27 13:11:35 +02:00
entry.h s390/traps: Change stack overflow message 2025-03-04 17:34:03 +01:00
entry.S s390/traps: Change stack overflow message 2025-03-04 17:34:03 +01:00
facility.c KVM: s390: vsie: Fix length of facility list shadowed 2023-12-23 10:41:09 +01:00
fpu.c s390/fpu: Re-add exception handling in load_fpu_state() 2024-07-31 16:30:20 +02:00
ftrace.c s390/cpufeature: Convert MACHINE_HAS_SEQ_INSN to cpu_has_seq_insn() 2025-03-04 17:18:04 +01:00
ftrace.h s390/ftrace: Remove unused ftrace_plt_template* 2024-08-27 20:16:48 +02:00
guarded_storage.c s390/cpufeature: Convert MACHINE_HAS_GS to cpu_has_gs() 2025-03-04 17:18:04 +01:00
head64.S s390/time: Convert MACHINE_HAS_SCC to machine_has_scc() 2025-03-04 17:18:06 +01:00
hiperdispatch.c s390/cpufeature: Convert MACHINE_HAS_TOPOLOGY to cpu_has_topology() 2025-03-04 17:18:05 +01:00
idle.c s390/idle: Remove duplicate get_lowcore() calls 2024-06-18 17:01:33 +02:00
ima_arch.c
ipl_vmparm.c s390/cio: remove unused include linux/spinlock.h from cio.h 2021-07-27 09:39:13 +02:00
ipl.c s390: Use inline qualifier for all EX_TABLE and ALTERNATIVE inline assemblies 2025-03-18 17:13:51 +01:00
irq.c s390/bear: Convert cpu_has_bear() to cpu feature function 2025-03-04 17:18:07 +01:00
jump_label.c jump_label: make initial NOP patching the special case 2022-06-24 09:48:55 +02:00
kdebugfs.c
kexec_elf.c s390, crash: wrap crash dumping code into crash related ifdefs 2024-02-23 17:48:23 -08:00
kexec_image.c s390, crash: wrap crash dumping code into crash related ifdefs 2024-02-23 17:48:23 -08:00
kprobes.c s390/cpufeature: Convert MACHINE_HAS_SEQ_INSN to cpu_has_seq_insn() 2025-03-04 17:18:04 +01:00
lgr.c s390: kernel: convert timeouts to use secs_to_jiffies() 2025-01-12 20:21:01 -08:00
machine_kexec_file.c s390, crash: wrap crash dumping code into crash related ifdefs 2024-02-23 17:48:23 -08:00
machine_kexec_reloc.c s390/kaslr: add support for R_390_JMP_SLOT relocation type 2020-05-20 10:13:27 +02:00
machine_kexec.c s390: Convert MACHINE_IS_[LPAR|VM|KVM], etc, machine_is_[lpar|vm|kvm]() 2025-03-04 17:18:07 +01:00
Makefile s390/diag: Move diag.c to diag specific folder 2024-12-17 12:46:14 +01:00
mcount.S s390/tracing: Enable HAVE_FTRACE_GRAPH_FUNC 2024-12-26 10:50:05 -05:00
module.c arch: make execmem setup available regardless of CONFIG_MODULES 2024-05-14 00:31:44 -07:00
nmi.c s390/cpufeature: Convert MACHINE_HAS_GS to cpu_has_gs() 2025-03-04 17:18:04 +01:00
nospec-branch.c s390/nospec: Push down alternative handling 2024-07-23 16:02:31 +02:00
nospec-sysfs.c s390/nospec: Switch over to sysfs_emit() 2024-10-25 16:03:24 +02:00
numa.c mm/memblock: add memblock_alloc_or_panic interface 2025-01-25 20:22:38 -08:00
os_info.c s390: Remove __bootdata annotations from declarations 2024-12-15 16:19:04 +01:00
perf_cpum_cf_events.c s390/cpum_cf: make crypto counters upward compatible across machine types 2024-04-09 17:29:56 +02:00
perf_cpum_cf.c Linux 6.13-rc1 2024-12-02 11:52:59 +01:00
perf_cpum_sf.c perf/core: Export perf_exclude_event() 2024-12-09 15:50:31 +01:00
perf_event.c Performance events changes for v6.13: 2024-11-19 13:34:06 -08:00
perf_pai_crypto.c perf/core: Save raw sample data conditionally based on sample type 2024-11-19 09:23:42 +01:00
perf_pai_ext.c perf/core: Save raw sample data conditionally based on sample type 2024-11-19 09:23:42 +01:00
perf_regs.c s390/fpu: remove anonymous union from struct fpu 2024-02-16 14:30:16 +01:00
process.c s390: Replace S390_lowcore by get_lowcore() 2024-06-18 17:01:33 +02:00
processor.c s390/tx: Convert MACHINE_HAS_TE to machine_has_tx() 2025-03-04 17:18:06 +01:00
ptrace.c s390/ptrace: Avoid KASAN false positives in regs_get_kernel_stack_nth() 2025-03-18 17:13:05 +01:00
reipl.S s390/kdump: Make kdump ready for lowcore relocation 2024-07-23 16:02:32 +02:00
relocate_kernel.S s390/relocate_kernel: adjust indentation 2023-04-19 17:24:18 +02:00
rethook.c s390/rethook: add local rethook header file 2023-02-06 11:13:53 +01:00
rethook.h s390/rethook: add local rethook header file 2023-02-06 11:13:53 +01:00
runtime_instr.c s390/runtime_instrumentation: fix storage key handling 2020-08-17 13:17:10 +02:00
setup.c s390/bear: Convert cpu_has_bear() to cpu feature function 2025-03-04 17:18:07 +01:00
signal.c s390/vdso: Move vdso symbol handling to separate header file 2024-09-13 17:28:36 +02:00
smp.c s390/diag: Convert MACHINE_HAS_DIAG9C to machine_has_diag9c() 2025-03-04 17:18:06 +01:00
stacktrace.c s390/stacktrace: Use break instead of return statement 2024-11-21 12:44:07 +01:00
sthyi.c s390/sthyi: Convert to use flag output macros 2024-11-13 14:31:31 +01:00
syscall.c s390: Remove 2k vs 4k page table leftovers 2025-03-18 17:13:05 +01:00
sysinfo.c s390: Convert MACHINE_IS_[LPAR|VM|KVM], etc, machine_is_[lpar|vm|kvm]() 2025-03-04 17:18:07 +01:00
text_amode31.S s390/amode31: Use exrl instead of ex 2025-01-13 09:50:17 +01:00
time.c s390/time: Convert MACHINE_HAS_SCC to machine_has_scc() 2025-03-04 17:18:06 +01:00
topology.c s390/cpufeature: Convert MACHINE_HAS_TOPOLOGY to cpu_has_topology() 2025-03-04 17:18:05 +01:00
trace.c s390/ftrace: fix potential crashes when switching tracers 2020-04-22 16:20:55 +02:00
traps.c s390: Use inline qualifier for all EX_TABLE and ALTERNATIVE inline assemblies 2025-03-18 17:13:51 +01:00
unwind_bc.c s390/unwind: disable KMSAN checks 2024-07-03 19:30:25 -07:00
uprobes.c s390/switch_to: use generic header file 2024-02-12 15:03:33 +01:00
uv.c KVM: s390: move pv gmap functions into kvm 2025-01-31 12:03:52 +01:00
vdso.c s390/vdso: Wire up getrandom() vdso implementation 2024-09-13 20:57:31 +02:00
vmcore_info.c s390: Remove __bootdata annotations from declarations 2024-12-15 16:19:04 +01:00
vmlinux.lds.S s390/fpu: Add fpc exception handler / remove fixup section again 2025-01-26 17:24:04 +01:00
vtime.c s390/vtime: Remove duplicate get_lowcore() calls 2024-06-18 17:01:33 +02:00
wti.c s390/wti: Add debugfs file to display missed grace periods per cpu 2024-08-29 22:56:35 +02:00