This series consists of a bunch of cleanups to the way we handle memory
barriers (though no changes to the sync instructions we use to implement
them) & atomic memory accesses. One major goal was to ensure the
Loongson3 LL/SC errata workarounds are applied in a safe manner from
within inline-asm & that we can automatically verify the resulting
kernel binary looks reasonable. Many patches are cleanups found along
the way.
Applies atop v5.4-rc1.
Paul Burton (37):
MIPS: Unify sc beqz definition
MIPS: Use compact branch for LL/SC loops on MIPSr6+
MIPS: barrier: Add __SYNC() infrastructure
MIPS: barrier: Clean up rmb() & wmb() definitions
MIPS: barrier: Clean up __smp_mb() definition
MIPS: barrier: Remove fast_mb() Octeon #ifdef'ery
MIPS: barrier: Clean up __sync() definition
MIPS: barrier: Clean up sync_ginv()
MIPS: atomic: Fix whitespace in ATOMIC_OP macros
MIPS: atomic: Handle !kernel_uses_llsc first
MIPS: atomic: Use one macro to generate 32b & 64b functions
MIPS: atomic: Emit Loongson3 sync workarounds within asm
MIPS: atomic: Use _atomic barriers in atomic_sub_if_positive()
MIPS: atomic: Unify 32b & 64b sub_if_positive
MIPS: atomic: Deduplicate 32b & 64b read, set, xchg, cmpxchg
MIPS: bitops: Use generic builtin ffs/fls; drop cpu_has_clo_clz
MIPS: bitops: Handle !kernel_uses_llsc first
MIPS: bitops: Only use ins for bit 16 or higher
MIPS: bitops: Use MIPS_ISA_REV, not #ifdefs
MIPS: bitops: ins start position is always an immediate
MIPS: bitops: Implement test_and_set_bit() in terms of _lock variant
MIPS: bitops: Allow immediates in test_and_{set,clear,change}_bit
MIPS: bitops: Use the BIT() macro
MIPS: bitops: Avoid redundant zero-comparison for non-LLSC
MIPS: bitops: Abstract LL/SC loops
MIPS: bitops: Use BIT_WORD() & BITS_PER_LONG
MIPS: bitops: Emit Loongson3 sync workarounds within asm
MIPS: bitops: Use smp_mb__before_atomic in test_* ops
MIPS: cmpxchg: Emit Loongson3 sync workarounds within asm
MIPS: cmpxchg: Omit redundant barriers for Loongson3
MIPS: futex: Emit Loongson3 sync workarounds within asm
MIPS: syscall: Emit Loongson3 sync workarounds within asm
MIPS: barrier: Remove loongson_llsc_mb()
MIPS: barrier: Make __smp_mb__before_atomic() a no-op for Loongson3
MIPS: genex: Add Loongson3 LL/SC workaround to ejtag_debug_handler
MIPS: genex: Don't reload address unnecessarily
MIPS: Check Loongson3 LL/SC errata workaround correctness
arch/mips/Makefile | 2 +-
arch/mips/Makefile.postlink | 10 +-
arch/mips/include/asm/atomic.h | 571 ++++++-----------
arch/mips/include/asm/barrier.h | 215 +------
arch/mips/include/asm/bitops.h | 593 ++++--------------
arch/mips/include/asm/cmpxchg.h | 59 +-
arch/mips/include/asm/cpu-features.h | 10 -
arch/mips/include/asm/futex.h | 9 +-
arch/mips/include/asm/llsc.h | 19 +-
.../asm/mach-malta/cpu-feature-overrides.h | 2 -
arch/mips/include/asm/sync.h | 207 ++++++
arch/mips/kernel/genex.S | 6 +-
arch/mips/kernel/pm-cps.c | 20 +-
arch/mips/kernel/syscall.c | 3 +-
arch/mips/lib/bitops.c | 57 +-
arch/mips/loongson64/Platform | 2 +-
arch/mips/tools/.gitignore | 1 +
arch/mips/tools/Makefile | 5 +
arch/mips/tools/loongson3-llsc-check.c | 307 +++++++++
19 files changed, 975 insertions(+), 1123 deletions(-)
create mode 100644 arch/mips/include/asm/sync.h
create mode 100644 arch/mips/tools/loongson3-llsc-check.c
--
2.23.0
