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James Hogan 926963160c MIPS: SMP: Drop stop_this_cpu() cpu_foreign_map hack 
Commit cccf34e9411c ("MIPS: c-r4k: Fix cache flushing for MT cores")
added the cpu_foreign_map cpumask containing a single VPE from each
online core, and recalculated it when secondary CPUs are brought up.

stop_this_cpu() was also updated to recalculate cpu_foreign_map, but
with an additional hack before marking the CPU as offline to copy
cpu_online_mask into cpu_foreign_map and perform an SMP memory barrier.

This appears to have been intended to prevent cache management IPIs
being missed when the VPE representing the core in cpu_foreign_map is
taken offline while other VPEs remain online. Unfortunately there is
nothing in this hack to prevent r4k_on_each_cpu() from reading the old
cpu_foreign_map, and smp_call_function_many() from reading that new
cpu_online_mask with the core's representative VPE marked offline. It
then wouldn't send an IPI to any online VPEs of that core.

stop_this_cpu() is only actually called in panic and system shutdown /
halt / reboot situations, in which case all CPUs are going down and we
don't really need to care about cache management, so drop this hack.

Note that the __cpu_disable() case for CPU hotplug is handled in the
previous commit, and no synchronisation is needed there due to the use
of stop_machine() which prevents hotplug from taking place while any CPU
has disabled preemption (as r4k_on_each_cpu() does).

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: Leonid Yegoshin <leonid.yegoshin@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/13796/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2016-07-29 10:19:28 +02:00
..
.gitignore
…
8250-platform.c
mips: remove needless include of module.h from core kernel files.
2011-10-31 19:30:57 -04:00
asm-offsets.c
MIPS: Support extended ASIDs
2016-05-13 14:02:20 +02:00
binfmt_elfn32.c
MIPS: ELF: Unify ABI classification macros
2016-05-13 15:30:25 +02:00
binfmt_elfo32.c
MIPS: ELF: Unify ABI classification macros
2016-05-13 15:30:25 +02:00
bmips_5xxx_init.S
MIPS: BMIPS: Make whitespacely correct.
2016-05-09 12:00:01 +02:00
bmips_vec.S
MIPS: BMIPS: Add Whirlwind (BMIPS5200) initialization code
2016-05-09 12:00:01 +02:00
branch.c
MIPS: Spelling fix lets -> let's
2016-05-28 12:35:09 +02:00
cevt-bcm1480.c
MIPS: cevt-bcm1480: Migrate to new 'set-state' interface
2015-09-03 12:07:51 +02:00
cevt-ds1287.c
MIPS: cevt-ds1287: Migrate to new 'set-state' interface
2015-09-03 12:07:51 +02:00
cevt-gt641xx.c
MIPS: cevt-gt641xx: Migrate to new 'set-state' interface
2015-09-03 12:07:51 +02:00
cevt-r4k.c
MIPS: cevt-r4k: Dynamically calculate min_delta_ns
2016-05-13 15:30:25 +02:00
cevt-sb1250.c
MIPS: cevt-sb1250: Migrate to new 'set-state' interface
2015-09-03 12:07:52 +02:00
cevt-txx9.c
MIPS: cevt-txx9: Migrate to new 'set-state' interface
2015-09-03 12:07:53 +02:00
cps-vec-ns16550.S
MIPS: CPS: Early debug using an ns16550-compatible UART
2015-11-11 08:34:25 +01:00
cps-vec.S
MIPS: CPS: Copy EVA configuration when starting secondary VPs.
2016-05-28 12:35:05 +02:00
cpu-bugs64.c
MIPS: Use EXCCODE_ constants with set_except_vector()
2016-01-24 03:28:21 +01:00
cpu-probe.c
MIPS: Fix incomplete separation of XPA CPU feature
2016-05-28 12:35:03 +02:00
crash_dump.c
mips: Convert pr_warning to pr_warn
2014-11-24 07:44:51 +01:00
crash.c
MIPS: Fix crash registers on non-crashing CPUs
2016-05-09 12:00:00 +02:00
csrc-bcm1480.c
MIPS: csrc-bcm1480: Implement read_sched_clock
2015-04-01 17:21:27 +02:00
csrc-ioasic.c
MIPS: csrc-ioasic: Implement read_sched_clock
2015-04-01 17:21:28 +02:00
csrc-r4k.c
MIPS: VDSO: Add implementations of gettimeofday() and clock_gettime()
2015-11-11 08:36:41 +01:00
csrc-sb1250.c
MIPS: csrc-sb1250: Implement read_sched_clock
2015-04-01 17:21:33 +02:00
early_printk_8250.c
MIPS: Add 8250/16550 serial early printk driver
2013-10-29 21:24:36 +01:00
early_printk.c
early_printk: consolidate random copies of identical code
2013-04-29 18:28:13 -07:00
elf.c
MIPS: Spelling fix lets -> let's
2016-05-28 12:35:09 +02:00
entry.S
MIPS: kernel: entry.S: Set correct ISA level for mips_ihb
2015-04-10 15:41:46 +02:00
ftrace.c
Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus
2014-08-07 08:47:00 -07:00
genex.S
MIPS: genex: Indent delay slots & clean whitespace
2016-05-13 14:02:20 +02:00
gpio_txx9.c
MIPS: txx9: switch to gpiochip_add_data()
2016-02-19 09:51:44 +01:00
head.S
MIPS: Remove redundant asm/pgtable-bits.h inclusions
2016-05-13 15:30:25 +02:00
i8253.c
MIPS: irq: Remove IRQF_DISABLED
2011-12-07 22:03:45 +00:00
idle.c
MIPS: Loongson: Add Loongson-3A R2 basic support
2016-05-13 14:02:14 +02:00
irq_txx9.c
MIPS: Whitespace cleanup.
2013-02-01 10:00:22 +01:00
irq-gt641xx.c
MIPS: Whitespace cleanup.
2013-02-01 10:00:22 +01:00
irq-msc01.c
MIPS: MSC: Prevent out-of-bounds writes to MIPS SC ioremap'd region
2014-06-26 10:48:23 +01:00
irq-rm7000.c
MIPS: Whitespace cleanup.
2013-02-01 10:00:22 +01:00
irq.c
MIPS: Clear Status IPL field when using EIC
2016-05-28 12:35:02 +02:00
jump_label.c
jump_label: Rename JUMP_LABEL_{EN,DIS}ABLE to JUMP_LABEL_{JMP,NOP}
2015-08-03 11:34:12 +02:00
kgdb.c
MIPS: Get rid of 'kgdb_early_setup' cruft.
2015-06-21 21:54:10 +02:00
kprobes.c
mips: Replace __get_cpu_var uses
2014-08-26 13:45:51 -04:00
linux32.c
unify compat fanotify_mark(2), switch to COMPAT_SYSCALL_DEFINE
2013-05-09 13:46:38 -04:00
machine_kexec.c
MIPS: kdump: Set correct value to kexec_indirection_page variable
2014-08-25 16:33:44 +02:00
Makefile
MIPS: Kernel: Add relocate.c
2016-05-13 14:02:02 +02:00
mcount.S
MIPS: mcount: Adjust stack pointer for static trace in MIPS32
2014-09-26 11:41:17 +02:00
mips_ksyms.c
MIPS: uaccess: Take EVA into account in [__]clear_user
2015-12-22 11:58:43 +01:00
mips_machine.c
MIPS: move mips_{set,get}_machine_name() to a more generic place
2013-05-08 01:19:07 +02:00
mips-cm.c
MIPS: Fix misspellings in comments.
2016-04-03 12:32:09 +02:00
mips-cpc.c
MIPS: CM, CPC: Ensure core-other GCRs reflect the correct core
2015-11-11 08:35:18 +01:00
mips-mt-fpaff.c
MIPS: Fix sched_getaffinity with MT FPAFF enabled
2015-08-03 09:25:02 +02:00
mips-mt.c
MIPS: MT: Remove SMTC support
2014-05-24 00:07:01 +02:00
mips-r2-to-r6-emul.c
MIPS: Spelling fix lets -> let's
2016-05-28 12:35:09 +02:00
module-rela.c
MIPS: module: fix incorrect IS_ERR_VALUE macro usages
2016-05-13 14:02:11 +02:00
module.c
MIPS: module: fix incorrect IS_ERR_VALUE macro usages
2016-05-13 14:02:11 +02:00
octeon_switch.S
MIPS: Fix octeon FP context switch handling
2015-10-02 19:16:06 +02:00
perf_event_mipsxx.c
MIPS: perf: Fix I6400 event numbers
2016-05-17 11:05:07 +02:00
perf_event.c
perf core: Add a 'nr' field to perf_event_callchain_context
2016-05-16 23:11:51 -03:00
pm-cps.c
MIPS: pm-cps: Avoid offset overflow on MIPSr6
2016-05-13 14:01:48 +02:00
pm.c
MIPS: Fix watchpoint restoration
2016-05-09 12:00:02 +02:00
proc.c
MIPS: Detect DSP v3 support
2016-05-13 14:01:57 +02:00
process.c
Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus
2016-05-28 16:41:39 -07:00
prom.c
MIPS: Fix build with CONFIG_OF=y for non OF-enabled targets
2015-08-03 09:25:00 +02:00
ptrace32.c
MIPS: Remove asm/user.h
2014-08-02 00:06:37 +02:00
ptrace.c
MIPS: ptrace: Prevent writes to read-only FCSR bits
2016-05-13 15:30:25 +02:00
r4k_fpu.S
MIPS: Use copy_s.fmt rather than copy_u.fmt
2016-05-09 12:00:04 +02:00
r4k_switch.S
MIPS: Remove redundant asm/pgtable-bits.h inclusions
2016-05-13 15:30:25 +02:00
r2300_fpu.S
MIPS: Avoid variant of .type unsupported by LLVM Assembler
2016-02-29 11:23:49 +01:00
r2300_switch.S
MIPS: Fix R2300 FP context switch handling
2015-10-02 19:16:46 +02:00
r6000_fpu.S
MIPS: Fix build with binutils 2.24.51+
2014-11-07 15:07:36 +01:00
relocate_kernel.S
MIPS: Replace add and sub instructions in relocate_kernel.S with addiu
2015-08-03 15:26:30 +02:00
relocate.c
MIPS: Kernel: Implement KASLR using CONFIG_RELOCATABLE
2016-05-13 14:02:03 +02:00
reset.c
MIPS: Provide fallback reboot/poweroff/halt implementations
2015-04-01 17:21:58 +02:00
rtlx-cmp.c
MIPS: APRP: Fix an issue when device_create() fails.
2014-08-01 17:30:35 +02:00
rtlx-mt.c
MIPS: APRP: Fix an issue when device_create() fails.
2014-08-01 17:30:35 +02:00
rtlx.c
MIPS: rtlx: Remove KERN_DEBUG from pr_debug() arguments in rtlx.c
2014-11-24 07:44:04 +01:00
scall32-o32.S
MIPS: scall: Handle seccomp filters which redirect syscalls
2016-05-13 14:02:00 +02:00
scall64-64.S
MIPS: scall: Handle seccomp filters which redirect syscalls
2016-05-13 14:02:00 +02:00
scall64-n32.S
KEYS: 64-bit MIPS needs to use compat_sys_keyctl for 32-bit userspace
2016-07-28 11:56:48 +02:00
scall64-o32.S
KEYS: 64-bit MIPS needs to use compat_sys_keyctl for 32-bit userspace
2016-07-28 11:56:48 +02:00
segment.c
MIPS: Print segment physical address when EU=1
2016-07-28 11:44:30 +02:00
setup.c
MIPS: Octeon: detect and fix byte swapped initramfs
2016-05-13 15:30:25 +02:00
signal32.c
MIPS: Support sending SIG_SYS to 32bit userspace from 64bit kernel
2016-05-13 14:02:00 +02:00
signal_n32.c
MIPS: Initial implementation of a VDSO
2015-11-11 08:36:36 +01:00
signal-common.h
MIPS: Save MSA extended context around signals
2015-09-03 12:07:59 +02:00
signal.c
MIPS: Fix sigreturn via VDSO on microMIPS kernel
2016-05-28 12:35:12 +02:00
smp-bmips.c
MIPS: SMP: Update cpu_foreign_map on CPU disable
2016-07-29 10:19:28 +02:00
smp-cmp.c
MIPS: Make smp CMP, CPS and MT use the new generic IPI functions
2016-02-25 10:56:58 +01:00
smp-cps.c
MIPS: SMP: Update cpu_foreign_map on CPU disable
2016-07-29 10:19:28 +02:00
smp-gic.c
MIPS: CM: make use of mips_cm_{lock,unlock}_other
2015-11-11 08:35:17 +01:00
smp-mt.c
MIPS: Make smp CMP, CPS and MT use the new generic IPI functions
2016-02-25 10:56:58 +01:00
smp-up.c
MIPS: SMP: Remove plat_smp_ops cpus_done method.
2014-05-27 11:06:42 +02:00
smp.c
MIPS: SMP: Drop stop_this_cpu() cpu_foreign_map hack
2016-07-29 10:19:28 +02:00
spinlock_test.c
MIPS: Declare mips_debugfs_dir in a header
2015-10-26 09:49:42 +01:00
spram.c
MIPS: Add P6600 cases to CPU switch statements
2016-05-13 14:01:52 +02:00
stacktrace.c
MIPS: Add LATENCYTOP support
2015-11-11 08:36:46 +01:00
sync-r4k.c
MIPS: sync-r4k: reduce skew while synchronization
2016-01-24 01:31:51 +01:00
syscall.c
MIPS: kernel: syscall: Set the appropriate ISA level for MIPS R6
2015-02-17 15:37:29 +00:00
sysrq.c
MIPS: Refactor dumping of TLB registers for r3k/r4k
2015-09-03 12:07:45 +02:00
time.c
MIPS: MT: Remove SMTC support
2014-05-24 00:07:01 +02:00
topology.c
…
traps.c
MIPS: MSA: Fix a link error on `_init_msa_upper' with older GCC
2016-05-17 11:02:45 +02:00
unaligned.c
MIPS: Allow emulation for unaligned [LS]DXC1 instructions
2016-05-13 15:30:25 +02:00
uprobes.c
MIPS: Add uprobes support.
2015-09-03 12:08:05 +02:00
vdso.c
vdso: make arch_setup_additional_pages wait for mmap_sem for write killable
2016-05-23 17:04:14 -07:00
vmlinux.lds.S
MIPS: Reserve space for relocation table
2016-05-13 14:02:02 +02:00
vpe-cmp.c
MIPS: APRP: Add VPE loader support for CMP platforms.
2014-01-22 20:19:02 +01:00
vpe-mt.c
MIPS: MT: Remove SMTC support
2014-05-24 00:07:01 +02:00
vpe.c
module: use a structure to encapsulate layout.
2015-12-04 22:46:25 +01:00
watch.c
MIPS: Add and use watch register field definitions
2016-05-13 14:02:13 +02:00