Chris Metcalf bc30c3576d tile: use a more conservative __my_cpu_offset in CONFIG_PREEMPT ...

commit f862eefec0 upstream.

It turns out the kernel relies on barrier() to force a reload of the
percpu offset value.  Since we can't easily modify the definition of
barrier() to include "tp" as an output register, we instead provide a
definition of __my_cpu_offset as extended assembly that includes a fake
stack read to hazard against barrier(), forcing gcc to know that it
must reread "tp" and recompute anything based on "tp" after a barrier.

This fixes observed hangs in the slub allocator when we are looping
on a percpu cmpxchg_double.

A similar fix for ARMv7 was made in June in change 509eb76ebf.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2013-10-13 16:08:34 -07:00

..

asm-offsets.h

arch/tile: core support for Tilera 32-bit chips.

2010-06-04 17:11:18 -04:00

atomic_32.h

arch/tile: optimize get_user/put_user and friends

2012-05-25 12:48:23 -04:00

atomic_64.h

Disintegrate asm/system.h for Tile

2012-03-28 18:30:03 +01:00

atomic.h

tile: support atomic64_dec_if_positive()

2013-03-22 15:47:00 -04:00

backtrace.h

arch/tile: refactor backtracing code

2011-05-02 13:49:14 -04:00

barrier.h

Disintegrate asm/system.h for Tile

2012-03-28 18:30:03 +01:00

bitops_32.h

Disintegrate asm/system.h for Tile

2012-03-28 18:30:03 +01:00

bitops_64.h

arch/tile: fix gcc 4.6 warnings in <asm/bitops_64.h>

2012-04-02 12:00:15 -04:00

bitops.h

tile: fix bug where fls(0) was not returning 0

2012-05-25 15:00:43 -04:00

cache.h

tilegx pci: support I/O to arbitrarily-cached pages

2012-07-18 16:40:05 -04:00

cacheflush.h

Disintegrate asm/system.h for Tile

2012-03-28 18:30:03 +01:00

checksum.h

arch/tile: break out the "csum a long" function to <asm/checksum.h>

2012-07-11 16:04:57 -04:00

cmpxchg.h

tile: fix multiple build failures from system.h dismantle

2012-04-02 11:57:37 -04:00

compat.h

tile: work around bug in the generic sys_llseek

2013-03-04 11:19:09 -05:00

current.h

arch/tile: core support for Tilera 32-bit chips.

2010-06-04 17:11:18 -04:00

delay.h

arch/tile: core support for Tilera 32-bit chips.

2010-06-04 17:11:18 -04:00

device.h

tile pci: enable IOMMU to support DMA for legacy devices

2012-07-18 16:40:17 -04:00

dma-mapping.h

tile: dma_debug: add debug_dma_mapping_error support

2012-11-28 15:29:00 +01:00

dma.h

arch/tile: core support for Tilera 32-bit chips.

2010-06-04 17:11:18 -04:00

edac.h

drivers/edac: provide support for tile architecture

2011-03-10 13:30:14 -05:00

elf.h

Merge git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile

2012-12-18 15:05:30 -08:00

fixmap.h

tilegx pci: support I/O to arbitrarily-cached pages

2012-07-18 16:40:05 -04:00

ftrace.h

arch/tile: core support for Tilera 32-bit chips.

2010-06-04 17:11:18 -04:00

futex.h

arch/tile: optimize get_user/put_user and friends

2012-05-25 12:48:23 -04:00

hardirq.h

arch/tile: core support for Tilera 32-bit chips.

2010-06-04 17:11:18 -04:00

hardwall.h

UAPI: (Scripted) Disintegrate arch/tile/include/asm

2012-10-09 09:47:47 +01:00

highmem.h

highmem: kill all __kmap_atomic()

2012-03-20 21:48:30 +08:00

homecache.h

tilegx pci: support I/O to arbitrarily-cached pages

2012-07-18 16:40:05 -04:00

hugetlb.h

mm/hugetlb: add more arch-defined huge_pte functions

2013-04-29 15:54:33 -07:00

hv_driver.h

arch/tile: core support for Tilera 32-bit chips.

2010-06-04 17:11:18 -04:00

hw_irq.h

arch/tile: core support for Tilera 32-bit chips.

2010-06-04 17:11:18 -04:00

ide.h

arch/tile: core support for Tilera 32-bit chips.

2010-06-04 17:11:18 -04:00

io.h

tile: fix memcpy_*io functions for allnoconfig

2013-02-08 13:20:40 -05:00

irq.h

arch/tile: use 0 for IRQ_RESCHEDULE instead of 1

2012-04-02 12:00:16 -04:00

irqflags.h

tile: comment assumption about __insn_mtspr for <asm/irqflags.h>

2013-04-09 10:08:14 -07:00

Kbuild

tracing,x86: Add a TSC trace_clock

2012-11-13 15:48:27 -05:00

kexec.h

arch/tile: support kexec() for tilegx

2012-05-25 12:48:25 -04:00

kmap_types.h

tile: remove km_type definitions

2012-07-24 15:27:32 +08:00

linkage.h

arch/tile: core support for Tilera 32-bit chips.

2010-06-04 17:11:18 -04:00

mmu_context.h

arch/tile: Allow tilegx to build with either 16K or 64K page size

2012-05-25 12:48:24 -04:00

mmu.h

arch/tile: Allow tilegx to build with either 16K or 64K page size

2012-05-25 12:48:24 -04:00

mmzone.h

Fix node_start/end_pfn() definition for mm/page_cgroup.c

2011-06-27 14:13:09 -07:00

module.h

arch/tile: Allow tilegx to build with either 16K or 64K page size

2012-05-25 12:48:24 -04:00

page.h

tilegx pci: support I/O to arbitrarily-cached pages

2012-07-18 16:40:05 -04:00

pci.h

ARCH: drivers remove __dev* attributes.

2013-01-03 15:57:13 -08:00

percpu.h

tile: use a more conservative __my_cpu_offset in CONFIG_PREEMPT

2013-10-13 16:08:34 -07:00

pgalloc.h

arch/tile: Allow tilegx to build with either 16K or 64K page size

2012-05-25 12:48:24 -04:00

pgtable_32.h

arch/tile: Allow tilegx to build with either 16K or 64K page size

2012-05-25 12:48:24 -04:00

pgtable_64.h

arch/tile: Allow tilegx to build with either 16K or 64K page size

2012-05-25 12:48:24 -04:00

pgtable.h

arch/tile: support multiple huge page sizes dynamically

2012-05-25 12:48:27 -04:00

processor.h

kill stray kernel_thread() garbage

2012-11-28 21:53:36 -05:00

ptrace.h

arch/tile: Call tracehook_report_syscall_{entry,exit} in syscall trace

2013-03-21 15:39:34 -04:00

sections.h

arch/tile: Miscellaneous cleanup changes.

2010-07-06 13:41:51 -04:00

setup.h

UAPI: (Scripted) Disintegrate arch/tile/include/asm

2012-10-09 09:47:47 +01:00

sigframe.h

arch/tile: core support for Tilera 32-bit chips.

2010-06-04 17:11:18 -04:00

signal.h

UAPI: (Scripted) Disintegrate arch/tile/include/asm

2012-10-09 09:47:47 +01:00

smp.h

smp: introduce a generic on_each_cpu_mask() function

2012-03-28 17:14:35 -07:00

spinlock_32.h

Disintegrate asm/system.h for Tile

2012-03-28 18:30:03 +01:00

spinlock_64.h

arch/tile: use atomic exchange in arch_write_unlock()

2012-04-02 12:13:49 -04:00

spinlock_types.h

arch/tile: core support for Tilera 32-bit chips.

2010-06-04 17:11:18 -04:00

spinlock.h

arch/tile: core support for Tilera 32-bit chips.

2010-06-04 17:11:18 -04:00

stack.h

arch/tile: various bugs in stack backtracer

2012-04-02 12:12:45 -04:00

string.h

arch/tile: core support for Tilera 32-bit chips.

2010-06-04 17:11:18 -04:00

switch_to.h

tile: support GENERIC_KERNEL_THREAD and GENERIC_KERNEL_EXECVE

2012-10-20 13:13:29 -04:00

syscall.h

tile: move declaration of sys_call_table to <asm/syscall.h>

2013-03-21 15:39:35 -04:00

syscalls.h

tile: move declaration of sys_call_table to <asm/syscall.h>

2013-03-21 15:39:35 -04:00

thread_info.h

Merge git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile

2013-05-01 10:48:34 -07:00

tile-desc_32.h

arch/tile: factor out <arch/opcode.h> header

2011-11-03 16:58:54 -04:00

tile-desc_64.h

arch/tile: factor out <arch/opcode.h> header

2011-11-03 16:58:54 -04:00

tile-desc.h

arch/tile: factor out <arch/opcode.h> header

2011-11-03 16:58:54 -04:00

timex.h

Disintegrate asm/system.h for Tile

2012-03-28 18:30:03 +01:00

tlb.h

arch/tile: core support for Tilera 32-bit chips.

2010-06-04 17:11:18 -04:00

tlbflush.h

arch/tile: support multiple huge page sizes dynamically

2012-05-25 12:48:27 -04:00

topology.h

tile: Remove SD_PREFER_LOCAL leftover

2012-08-15 13:22:55 +02:00

traps.h

arch/tile: work around a hardware issue with the return-address stack

2012-04-02 12:12:48 -04:00

uaccess.h

Kconfig: consolidate CONFIG_DEBUG_STRICT_USER_COPY_CHECKS

2013-04-30 17:04:09 -07:00

unaligned.h

Disintegrate asm/system.h for Tile

2012-03-28 18:30:03 +01:00

unistd.h

burying unused conditionals

2013-02-14 09:21:15 -05:00

user.h

arch/tile: core support for Tilera 32-bit chips.

2010-06-04 17:11:18 -04:00

vga.h

arch/tile: various header improvements for building drivers

2011-05-04 14:40:54 -04:00