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linux/arch/parisc/include/asm
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John David Anglin 400db6fe74 parisc: Remove unnecessary barriers from spinlock.h 
commit 3b885ac1dc upstream.

Now that mb() is an instruction barrier, it will slow performance if we issue
unnecessary barriers.

The spinlock defines have a number of unnecessary barriers.  The __ldcw()
define is both a hardware and compiler barrier.  The mb() barriers in the
routines using __ldcw() serve no purpose.

The only barrier needed is the one in arch_spin_unlock().  We need to ensure
all accesses are complete prior to releasing the lock.

Signed-off-by: John David Anglin <dave.anglin@bell.net>
Cc: stable@vger.kernel.org # 4.0+
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-08-24 13:27:01 +02:00
..
agp.h agp: kill phys_to_gart() and gart_to_phys() 2009-08-03 09:05:00 +01:00
asm-offsets.h kbuild: move asm-offsets.h to include/generated 2009-12-12 13:08:14 +01:00
asmregs.h
assembly.h parisc: provide macro to create exception table entries 2013-11-07 22:25:33 +01:00
atomic.h atomic, arch: Audit atomic_{read,set}() 2015-09-23 09:54:28 +02:00
barrier.h parisc: Define mb() and add memory barriers to assembler unlock sequences 2018-08-15 17:42:05 +02:00
bitops.h parisc: Don't use BITS_PER_LONG in userspace-exported swab.h header 2017-02-01 08:30:53 +01:00
bug.h [PARISC] fix missing TAINT_WARN problem 2012-06-05 14:10:17 +09:00
bugs.h
cache.h parisc: Change L1_CACHE_BYTES to 16 2015-10-25 10:01:17 +01:00
cacheflush.h kmap_atomic_to_page() has no users, remove it 2015-11-09 15:11:24 -08:00
checksum.h parisc: fix ipv6 checksum 2009-01-05 19:11:05 +00:00
cmpxchg.h arch: Remove __ARCH_HAVE_CMPXCHG 2015-05-13 10:55:42 +02:00
compat_ucontext.h
compat.h parisc: Fixes and cleanups in kernel uapi header files 2015-11-08 20:27:01 +01:00
current.h
delay.h parisc: make udelay() SMP-safe 2013-11-07 22:28:26 +01:00
dma-mapping.h parisc: DMA API: return error instead of BUG_ON for dma ops on non dma devs 2017-07-21 07:44:56 +02:00
dma.h Disintegrate asm/system.h for PA-RISC 2012-03-28 18:30:02 +01:00
eisa_bus.h
eisa_eeprom.h Fix common misspellings 2011-03-31 11:26:23 -03:00
elf.h parisc,metag: Fix crashes due to stack randomization on stack-grows-upwards architectures 2015-05-12 22:03:44 +02:00
fb.h
fixmap.h parisc: rename parisc's vmalloc_start to parisc_vmalloc_start 2009-09-27 23:27:04 -04:00
floppy.h parisc: remove IRQF_DISABLED 2013-02-20 22:50:26 +01:00
ftrace.h ftrace: Make CALLER_ADDRx macros more generic 2014-05-21 03:10:32 -04:00
futex.h futex: Remove duplicated code and fix undefined behaviour 2018-05-26 08:48:50 +02:00
grfioctl.h
hardirq.h parisc: do not count IPI calls twice 2013-11-07 22:28:54 +01:00
hardware.h parisc: drop include of asm/pdc.h from asm/hardware.h 2012-05-10 15:12:08 -07:00
hugetlb.h parisc: Protect huge page pte changes with spinlocks 2016-02-17 12:30:57 -08:00
ide.h
io.h parisc: Define ioremap_uc and ioremap_wc 2015-09-08 15:30:37 +02:00
irq.h [PARISC] Convert to new irq_chip functions 2011-02-10 10:22:14 -06:00
irqflags.h Fix IRQ flag handling naming 2010-10-07 14:08:55 +01:00
kbdleds.h keyboard: Use BIOS Keyboard variable to set Numlock 2012-05-08 14:19:41 -07:00
Kbuild mm: clean up per architecture MM hook header files 2015-07-17 16:39:53 -07:00
kmap_types.h kmap_types: make most arches use generic header file 2009-06-16 19:47:51 -07:00
ldcw.h parisc: Fix alignment of pa_tlb_lock in assembly on 32-bit SMP kernel 2018-01-10 09:27:12 +01:00
led.h
linkage.h
machdep.h
mc146818rtc.h
mckinley.h
mmu_context.h parisc/mm: Ensure IRQs are off in switch_mm() 2017-07-21 07:44:56 +02:00
mmu.h
mmzone.h parisc: fix kernel BUG at arch/parisc/include/asm/mmzone.h:50 (part 2) 2013-06-18 20:20:21 +02:00
module.h Make most arch asm/module.h files use asm-generic/module.h 2012-09-28 14:31:03 +09:30
page.h parisc: Add defines for Huge page support 2015-11-22 12:22:34 +01:00
parisc-device.h parisc: Fix interrupt routing for C8000 serial ports 2013-07-31 23:42:32 +02:00
parport.h ARCH: drivers remove __dev* attributes. 2013-01-03 15:57:13 -08:00
pci.h Merge branch 'for-4.2/sg' of git://git.kernel.dk/linux-block 2015-06-25 15:22:36 -07:00
pdc_chassis.h
pdc.h UAPI: (Scripted) Disintegrate arch/parisc/include/asm 2012-10-16 21:28:05 +01:00
pdcpat.h
perf_event.h irq_work: Add generic hardirq context callbacks 2010-10-18 19:58:50 +02:00
perf.h
pgalloc.h parisc: Fix wrong comment regarding first pmd entry flags 2015-11-20 10:19:18 +01:00
pgtable.h parisc: Purge TLB before setting PTE 2016-12-15 08:49:21 -08:00
prefetch.h [PARISC] fix panic on prefetch(NULL) on PA7300LC 2012-05-16 13:15:21 +01:00
processor.h parisc: Drop definition of start_thread_som for HP-UX SOM binaries 2015-11-20 10:19:19 +01:00
psw.h Disintegrate asm/system.h for PA-RISC 2012-03-28 18:30:02 +01:00
ptrace.h parisc: add kernel audit feature 2013-11-07 22:27:20 +01:00
ropes.h
rt_sigframe.h
rtc.h
runway.h
sections.h
serial.h parisc: remove empty SERIAL_PORT_DFNS in serial.h 2013-11-30 21:02:18 +01:00
shmparam.h parisc: change value of SHMLBA from 0x00400000 to PAGE_SIZE 2014-04-13 15:00:53 +02:00
signal.h Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal 2013-02-23 18:50:11 -08:00
smp.h [PARISC] Fix parisc compile failure after smp: Add task_struct argument to __cpu_up() 2012-05-25 12:35:45 +01:00
socket.h parisc: break out SOCK_NONBLOCK define to own asm header file 2013-11-19 23:36:17 +01:00
special_insns.h parisc: optimize mtsp(0,sr) inline assembly 2013-07-09 22:09:21 +02:00
spinlock_types.h locking: Convert raw_rwlock to arch_rwlock 2009-12-14 23:55:32 +01:00
spinlock.h parisc: Remove unnecessary barriers from spinlock.h 2018-08-24 13:27:01 +02:00
string.h
superio.h
switch_to.h Disintegrate asm/system.h for PA-RISC 2012-03-28 18:30:02 +01:00
syscall.h ARCH: AUDIT: implement syscall_get_arch for all arches 2014-09-23 16:20:10 -04:00
termios.h UAPI: (Scripted) Disintegrate arch/parisc/include/asm 2012-10-16 21:28:05 +01:00
thread_info.h arch: Remove exec_domain from remaining archs 2015-04-12 21:03:30 +02:00
timex.h Disintegrate asm/system.h for PA-RISC 2012-03-28 18:30:02 +01:00
tlb.h mm: Pass virtual address to [__]p{te,ud,md}_free_tlb() 2009-07-27 12:10:38 -07:00
tlbflush.h parisc: Fix some PTE/TLB race conditions and optimize __flush_tlb_range based on timing results 2015-07-10 21:47:47 +02:00
traps.h parisc: mark parisc_terminate() noreturn and cold. 2013-10-13 17:44:49 +02:00
uaccess.h parisc: fix copy_from_user() 2016-09-24 10:07:45 +02:00
ucontext.h
unaligned.h
unistd.h sys_sgetmask/sys_ssetmask: add CONFIG_SGETMASK_SYSCALL 2014-06-04 16:54:14 -07:00
unwind.h