forked from Minki/linux
2c32c65e37
On revisions of Cortex-A15 prior to r3p3, a CLREX instruction at PL1 may
falsely trigger a watchpoint exception, leading to potential data aborts
during exception return and/or livelock.
This patch resolves the issue in the following ways:
- Replacing our uses of CLREX with a dummy STREX sequence instead (as
we did for v6 CPUs).
- Removing the clrex code from v7_exit_coherency_flush and derivatives,
since this only exists as a minor performance improvement when
non-cached exclusives are in use (Linux doesn't use these).
Benchmarking on a variety of ARM cores revealed no measurable
performance difference with this change applied, so the change is
performed unconditionally and no new Kconfig entry is added.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Cc: stable@vger.kernel.org
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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| .. | ||
| .gitignore | ||
| arch_timer.c | ||
| armksyms.c | ||
| arthur.c | ||
| asm-offsets.c | ||
| atags_compat.c | ||
| atags_parse.c | ||
| atags_proc.c | ||
| atags.h | ||
| bios32.c | ||
| calls.S | ||
| cpuidle.c | ||
| crash_dump.c | ||
| debug.S | ||
| devtree.c | ||
| dma-isa.c | ||
| dma.c | ||
| early_printk.c | ||
| elf.c | ||
| entry-armv.S | ||
| entry-common.S | ||
| entry-header.S | ||
| entry-v7m.S | ||
| etm.c | ||
| fiq.c | ||
| fiqasm.S | ||
| ftrace.c | ||
| head-common.S | ||
| head-nommu.S | ||
| head.S | ||
| hibernate.c | ||
| hw_breakpoint.c | ||
| hyp-stub.S | ||
| insn.c | ||
| insn.h | ||
| io.c | ||
| irq.c | ||
| isa.c | ||
| iwmmxt.S | ||
| jump_label.c | ||
| kgdb.c | ||
| kprobes-arm.c | ||
| kprobes-common.c | ||
| kprobes-test-arm.c | ||
| kprobes-test-thumb.c | ||
| kprobes-test.c | ||
| kprobes-test.h | ||
| kprobes-thumb.c | ||
| kprobes.c | ||
| kprobes.h | ||
| machine_kexec.c | ||
| Makefile | ||
| module.c | ||
| opcodes.c | ||
| patch.c | ||
| patch.h | ||
| perf_event_cpu.c | ||
| perf_event_v6.c | ||
| perf_event_v7.c | ||
| perf_event_xscale.c | ||
| perf_event.c | ||
| perf_regs.c | ||
| pj4-cp0.c | ||
| probes-arm.c | ||
| probes-arm.h | ||
| probes-thumb.c | ||
| probes-thumb.h | ||
| probes.c | ||
| probes.h | ||
| process.c | ||
| psci_smp.c | ||
| psci.c | ||
| ptrace.c | ||
| relocate_kernel.S | ||
| return_address.c | ||
| setup.c | ||
| signal.c | ||
| sigreturn_codes.S | ||
| sleep.S | ||
| smp_scu.c | ||
| smp_tlb.c | ||
| smp_twd.c | ||
| smp.c | ||
| stacktrace.c | ||
| suspend.c | ||
| swp_emulate.c | ||
| sys_arm.c | ||
| sys_oabi-compat.c | ||
| tcm.c | ||
| thumbee.c | ||
| time.c | ||
| topology.c | ||
| traps.c | ||
| unwind.c | ||
| uprobes-arm.c | ||
| uprobes.c | ||
| uprobes.h | ||
| v7m.c | ||
| vmlinux.lds.S | ||
| xscale-cp0.c | ||