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Robert Jennings 434f98c48f [POWERPC] atomic_dec_if_positive sign extension fix 
On 64-bit machines, if an atomic counter is explicitly set to a
negative value, the atomic_dec_if_positive function will decrement and
store the next smallest value in the atomic counter, contrary to its
intended operation.

The comparison to determine if the decrement will make the result
negative was done by the "addic." instruction, which operates on a
64-bit value, namely the zero-extended word loaded from the atomic
variable.  This patch uses an explicit word compare (cmpwi) and
changes the addic. to an addi (also changing "=&r" to "=&b" so that r0
isn't used, and addi doesn't become li).

This also fixes a bug for both 32-bit and 64-bit in that previously
0x80000000 was considered positive, since the result after
decrementing is positive.  Now it is considered negative.

Also, I clarify the return value in the comments just to make it clear
that the value returned is always the decremented value, even if that
value is not stored back to the atomic counter.

Signed-off-by: Robert Jennings <rcj@linux.vnet.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
2007-01-22 21:27:36 +11:00
..
iseries [POWERPC] Refactor 64 bits DMA operations 2006-12-04 20:38:40 +11:00
8253pit.h
a.out.h
abs_addr.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
agp.h
asm-compat.h [POWERPC] Support feature fixups in vdso's 2006-10-25 11:54:07 +10:00
atomic.h [POWERPC] atomic_dec_if_positive sign extension fix 2007-01-22 21:27:36 +11:00
auxvec.h
backlight.h [PATCH] powermac: More powermac backlight fixes 2006-07-31 13:28:45 -07:00
bitops.h [PATCH] LOG2: Make powerpc's __ilog2_u64() take a 64-bit argument 2006-12-11 12:29:27 -08:00
bootx.h
btext.h
bug.h [POWERPC] Fix manual assembly WARN_ON() in enter_rtas(). 2007-01-09 17:03:02 +11:00
bugs.h
byteorder.h
cache.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
cacheflush.h [PATCH] Optimize D-cache alias handling on fork 2006-12-13 09:27:08 -08:00
cell-pmu.h [POWERPC] cell: Add oprofile support 2006-12-04 20:40:14 +11:00
checksum.h [NET]: POWERPC checksum annotations and cleanups. 2006-12-02 21:23:20 -08:00
compat.h
cputable.h Merge branch 'for_paulus' of master.kernel.org:/pub/scm/linux/kernel/git/galak/powerpc 2006-12-11 16:31:42 +11:00
cputime.h [PATCH] powerpc: implement missing jiffies64_to_cputime64() 2006-07-05 09:39:54 -07:00
current.h [POWERPC] Make current preempt-safe 2006-11-01 14:52:48 +11:00
dbdma.h [POWERPC] Xserve cpu-meter driver 2006-12-04 20:39:30 +11:00
dcr-mmio.h [POWERPC] Generic DCR infrastructure 2006-12-04 16:08:25 +11:00
dcr-native.h [POWERPC] Only export __mtdcr/__mfdcr if CONFIG_PPC_DCR is set 2006-12-10 23:15:47 -06:00
dcr.h [POWERPC] Only export __mtdcr/__mfdcr if CONFIG_PPC_DCR is set 2006-12-10 23:15:47 -06:00
delay.h [POWERPC] Fix mdelay badness on shared processor partitions 2006-06-21 15:01:33 +10:00
device.h [POWERPC] Refactor 64 bits DMA operations 2006-12-04 20:38:40 +11:00
div64.h
dma-mapping.h [PATCH] Pass struct dev pointer to dma_cache_sync() 2006-12-07 08:39:41 -08:00
dma.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
eeh.h [POWERPC] Merge 32 and 64 bits asm-powerpc/io.h 2006-12-04 20:39:05 +11:00
eeh_event.h [PATCH] powerpc/pseries: clear PCI failure counter if no new failures 2006-04-22 18:46:13 +10:00
elf.h [PATCH] elf: Always define elf_addr_t in linux/elf.h 2006-12-07 08:39:38 -08:00
emergency-restart.h
errno.h
fcntl.h
firmware.h [POWERPC] ps3: multiplatform build fixes 2006-12-04 20:41:16 +11:00
floppy.h [PATCH] irq-flags: POWERPC: Use the new IRQF_ constants 2006-07-02 13:58:47 -07:00
fs_pd.h POWERPC: Get rid of remapping the whole immr 2006-09-21 22:37:58 +04:00
futex.h [PATCH] mm: pagefault_{disable,enable}() 2006-12-07 08:39:21 -08:00
grackle.h
hardirq.h
heathrow.h
hvcall.h [POWERPC] Fix bugs in the hypervisor call stats code 2007-01-09 17:03:03 +11:00
hvconsole.h [PATCH] powerpc: hvc_console updates 2006-03-28 16:45:26 +11:00
hvcserver.h
hw_irq.h [POWERPC] Delete unused irq functions on powerpc 2006-12-08 17:10:18 +11:00
i8259.h [POWERPC] Fix CHRP platforms with only 8259 2006-10-25 13:49:22 +10:00
ibmebus.h [POWERPC] Refactor 64 bits DMA operations 2006-12-04 20:38:40 +11:00
ide.h [POWERPC] Merge 32 and 64 bits asm-powerpc/io.h 2006-12-04 20:39:05 +11:00
immap_86xx.h [POWERPC] Add 8641 Register space and IRQ definitions. 2006-06-21 15:01:28 +10:00
immap_qe.h [PATCH] Optimize qe_brg struct to use an array 2006-11-13 14:49:01 +11:00
io-defs.h [POWERPC] Merge 32 and 64 bits asm-powerpc/io.h 2006-12-04 20:39:05 +11:00
io.h [POWERPC] include/asm-powerpc/: "extern inline" -> "static inline" 2006-12-04 20:41:26 +11:00
ioctl.h
ioctls.h
iommu.h [POWERPC] Cell iommu support 2006-12-04 20:39:02 +11:00
ipc.h
ipcbuf.h
ipic.h [POWERPC] Fix up after irq changes 2006-10-07 22:08:26 +10:00
irq.h [POWERPC] add virq_to_hw accessor routine 2006-12-04 20:40:37 +11:00
irq_regs.h IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
irqflags.h [PATCH] lockdep: irqtrace subsystem, core 2006-07-03 15:27:03 -07:00
Kbuild [POWERPC] cell: Fix spu_info.h header export 2006-12-08 15:55:55 +11:00
kdebug.h [PATCH] Notify page fault call chain for powerpc 2006-06-26 09:58:22 -07:00
kdump.h [POWERPC] kdump: Support kernels having 64k page size. 2006-09-13 18:30:04 +10:00
kexec.h [POWERPC] Make crash.c work on 32-bit and 64-bit 2006-08-17 16:41:10 +10:00
keylargo.h
kmap_types.h
kprobes.h [PATCH] kprobes: handle symbol resolution when <module:.symbol> is specified 2006-10-02 07:57:16 -07:00
linkage.h
lmb.h [PATCH] powerpc: Remove calculation of io hole 2006-03-22 15:04:30 +11:00
local.h
lppaca.h [POWERPC] Update lppaca offset comments 2006-08-08 17:08:58 +10:00
lv1call.h [POWERPC] ps3: add lv1 hvcalls 2006-12-04 20:40:44 +11:00
machdep.h [POWERPC] Merge 32 and 64 bits asm-powerpc/io.h 2006-12-04 20:39:05 +11:00
macio.h
mc146818rtc.h
mediabay.h
mman.h
mmu.h [POWERPC] Make pSeries_lpar_hpte_insert static 2006-10-16 16:33:04 +10:00
mmu_context.h [POWERPC] Correct the MAX_CONTEXT definition 2006-06-29 16:16:15 +10:00
mmzone.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
module.h [POWERPC] Generic BUG for powerpc 2006-12-11 16:35:07 +11:00
mpc52xx.h [POWERPC] 52xx: Don't use device_initcall to probe of_platform_bus 2007-01-09 17:03:02 +11:00
mpc85xx.h [PATCH] ppc: Fix io.h for config with CONFIG_PCI not set 2006-11-13 14:49:25 +11:00
mpc86xx.h [POWERPC] Use mpc8641hpcn PIC base address from dev tree. 2006-08-25 14:32:13 +10:00
mpic.h [POWERPC] Improve MPIC driver auto-configuration from DT 2006-12-04 16:08:41 +11:00
msgbuf.h
mutex.h
namei.h
nvram.h
of_device.h [POWERPC] Refactor 64 bits DMA operations 2006-12-04 20:38:40 +11:00
of_platform.h [POWERPC] Souped-up of_platform_device support 2006-12-04 16:08:52 +11:00
ohare.h
oprofile_impl.h [POWERPC] cell: Add oprofile support 2006-12-04 20:40:14 +11:00
paca.h [POWERPC] Lazy interrupt disabling for 64-bit machines 2006-10-16 16:31:36 +10:00
page.h [POWERPC] Remove DISCONTIGMEM cruft from page.h 2006-09-22 15:19:58 +10:00
page_32.h [PATCH] LOG2: Provide ilog2() fallbacks for powerpc 2006-12-08 08:28:51 -08:00
page_64.h [PATCH] powerpc: Fix pagetable bloat for hugepages 2006-04-28 15:02:51 +10:00
param.h
parport.h
pci-bridge.h [POWERPC] Fix mmap of PCI resource with hack for X 2006-12-08 17:21:06 +11:00
pci.h [POWERPC] Define pci_unmap_addr() et al. when CONFIG_NOT_COHERENT_CACHE=y 2006-12-08 17:10:18 +11:00
percpu.h [PATCH] lockdep: add per_cpu_offset() 2006-07-03 15:27:00 -07:00
pgalloc.h [PATCH] slab: remove kmem_cache_t 2006-12-07 08:39:25 -08:00
pgtable-4k.h [PATCH] Standardize pxx_page macros 2006-09-26 08:48:51 -07:00
pgtable-64k.h powerpc: Use 64k pages without needing cache-inhibited large pages 2006-06-15 10:45:18 +10:00
pgtable.h [PATCH] Standardize pxx_page macros 2006-09-26 08:48:51 -07:00
pmac_feature.h [PATCH] powerpc: Kill _machine and hard-coded platform numbers 2006-03-28 23:15:54 +11:00
pmac_low_i2c.h
pmac_pfunc.h typo fixes: mecanism -> mechanism 2006-06-30 18:20:44 +02:00
pmc.h [POWERPC] Fix oprofile support for e500 in arch/powerpc 2006-11-01 14:52:48 +11:00
poll.h [PATCH] POLLRDHUP/EPOLLRDHUP handling for half-closed devices notifications 2006-03-25 08:22:56 -08:00
posix_types.h [PATCH] FD_ZERO build fix 2007-01-11 18:18:22 -08:00
ppc-pci.h [POWERPC] Generic OF platform driver for PCI host bridges. 2006-12-04 20:38:49 +11:00
ppc_asm.h [POWERPC] Cell timebase bug workaround 2006-10-25 11:54:18 +10:00
processor.h [PATCH] Remove _machine macro 2006-11-13 14:44:58 +11:00
prom.h Merge branch 'linux-2.6' into for-linus 2006-12-04 15:59:07 +11:00
ps3.h [POWERPC] ps3: add ps3 platform system bus support 2006-12-04 20:40:57 +11:00
pSeries_reconfig.h
ptrace.h [PATCH] Add regs_return_value() helper 2006-10-02 07:57:16 -07:00
qe.h [POWERPC] Add QUICC Engine (QE) infrastructure 2006-10-04 15:24:27 +10:00
qe_ic.h [POWERPC] Add QUICC Engine (QE) infrastructure 2006-10-04 15:24:27 +10:00
reg.h [POWERPC] Add SPURR SPR to sysfs 2006-12-09 11:39:06 +11:00
reg_8xx.h
resource.h
rtas.h [POWERPC] Add rtas_service_present() helper 2006-12-08 17:10:22 +11:00
rtc.h
rwsem.h [PATCH] lockdep: remove RWSEM_DEBUG remnants 2006-07-03 15:27:01 -07:00
scatterlist.h
seccomp.h
sections.h
semaphore.h
sembuf.h
serial.h
setup.h [PATCH] cleanup asm/setup.h userspace visibility 2006-12-07 08:39:46 -08:00
shmbuf.h
shmparam.h
sigcontext.h
siginfo.h
signal.h [PATCH] irq-flags: POWERPC: Use the new IRQF_ constants 2006-07-02 13:58:47 -07:00
smp.h IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
smu.h [POWERPC] powermac: Constify & voidify get_property() 2006-07-31 15:55:05 +10:00
socket.h [AF_UNIX]: Datagram getpeersec 2006-06-29 16:58:06 -07:00
sockios.h
sparsemem.h [POWERPC] ps3: add lpar addressing 2006-12-04 20:40:52 +11:00
spinlock.h [PATCH] Directed yield: direct yield of spinlocks for powerpc 2006-10-01 00:39:22 -07:00
spinlock_types.h
spu.h [POWERPC] cell: add forward struct declarations to spu.h 2006-12-19 15:35:36 +01:00
spu_csa.h [POWERPC] spufs: wrap mfc sdr access 2006-10-25 14:20:20 +10:00
spu_info.h [POWERPC] spufs: Add /lslr, /dma_info and /proxydma files 2006-12-04 20:39:45 +11:00
spu_priv1.h [POWERPC] cell: abstract spu management routines 2006-12-04 20:40:39 +11:00
sstep.h
stat.h
statfs.h
string.h powerpc: fix strncasecmp prototype 2006-03-25 09:41:40 -08:00
synch.h [PATCH] powerpc: newline for ISYNC_ON_SMP 2006-02-24 14:06:00 +11:00
syscalls.h [PATCH] powerpc: declare arch syscalls in <asm/syscalls.h> 2006-03-27 14:48:22 +11:00
systbl.h [POWERPC] Wire up sys_move_pages 2006-11-16 10:31:14 +11:00
system.h [POWERPC] Fix rmb() for e500-based machines it 2006-11-01 14:52:48 +11:00
tce.h [POWERPC] Use 4kB iommu pages even on 64kB-page systems 2006-11-01 14:52:48 +11:00
termbits.h [PATCH] tty: switch to ktermios 2006-12-08 08:28:57 -08:00
termios.h
thread_info.h [PATCH] PM: Fix SMP races in the freezer 2006-12-13 09:05:49 -08:00
time.h [POWERPC] Revert "[POWERPC] Add powerpc get/set_rtc_time interface to new generic rtc class" 2006-11-22 12:13:36 +11:00
timex.h [POWERPC] Cell timebase bug workaround 2006-10-25 11:54:18 +10:00
tlb.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
tlbflush.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
topology.h [PATCH] sched: add option to serialize load balancing 2006-12-10 09:55:43 -08:00
tsi108.h [POWERPC] include/asm-powerpc/: "extern inline" -> "static inline" 2006-12-04 20:41:26 +11:00
tsi108_irq.h [POWERPC] Update mpc7448hpc2 board irq support using device tree 2006-08-23 15:51:18 +10:00
types.h [PATCH] Centralise definitions of sector_t and blkcnt_t 2006-12-04 19:41:15 -08:00
uaccess.h [POWERPC] include/asm-powerpc/: "extern inline" -> "static inline" 2006-12-04 20:41:26 +11:00
ucc.h [POWERPC] Add QUICC Engine (QE) infrastructure 2006-10-04 15:24:27 +10:00
ucc_fast.h [POWERPC] Add QUICC Engine (QE) infrastructure 2006-10-04 15:24:27 +10:00
ucc_slow.h [POWERPC] Add QUICC Engine (QE) infrastructure 2006-10-04 15:24:27 +10:00
ucontext.h
udbg.h [POWERPC] Add udbg support for RTAS console 2006-06-28 11:59:48 +10:00
unaligned.h
uninorth.h
unistd.h [PATCH] remove kernel syscalls 2006-12-07 08:39:37 -08:00
user.h
vdso.h
vdso_datapage.h [PATCH] powerpc: Kill _machine and hard-coded platform numbers 2006-03-28 23:15:54 +11:00
vga.h [PATCH] vgacon: make VGA_MAP_MEM take size, remove extra use 2006-06-22 15:05:58 -07:00
vio.h [POWERPC] Refactor 64 bits DMA operations 2006-12-04 20:38:40 +11:00
xmon.h [POWERPC] add support for stopping spus from xmon 2006-10-25 14:20:22 +10:00
xor.h