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05f016d2ca
kernel_optimize_test/arch/parisc/kernel
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John David Anglin 05f016d2ca parisc: Fix validity check of pointer size argument in new CAS implementation 
As noted by Christoph Biedl, passing a pointer size of 4 in the new CAS
implementation causes a kernel crash.  The attached patch corrects the
off by one error in the argument validity check.

In reviewing the code, I noticed that we only perform word operations
with the pointer size argument.  The subi instruction intentionally uses
a word condition on 64-bit kernels.  Nullification was used instead of a
cmpib instruction as the branch should never be taken.  The shlw
pseudo-operation generates a depw,z instruction and it clears the target
before doing a shift left word deposit.  Thus, we don't need to clip the
upper 32 bits of this argument on 64-bit kernels.

Tested with a gcc testsuite run with a 64-bit kernel.  The gcc atomic
code in libgcc is the only direct user of the new CAS implementation
that I am aware of.

Signed-off-by: John David Anglin <dave.anglin@bell.net>
Cc: stable@vger.kernel.org # 3.13+
Signed-off-by: Helge Deller <deller@gmx.de>
2017-11-17 15:27:13 +01:00
..
.gitignore
asm-offsets.c parisc: Drop per_cpu uaccess related exception_data struct 2017-05-10 17:46:13 +02:00
audit.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
binfmt_elf32.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
cache.c parisc: Handle vma's whose context is not current in flush_cache_range 2017-07-31 08:22:33 +02:00
compat_audit.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
drivers.c parisc: parisc_bus_type: use dev_groups and not dev_attrs for bus_type 2017-06-09 11:00:45 +02:00
entry.S scripts/spelling.txt: add regsiter -> register spelling mistake 2017-05-08 17:15:13 -07:00
firmware.c parisc: Add wrapper for pdc_instr() firmware function 2017-09-22 19:46:44 +02:00
ftrace.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
hardware.c
head.S parisc: Fix ftrace function tracer 2016-04-14 17:47:19 +02:00
hpmc.S parisc: Don't hardcode PSW values in hpmc code 2017-06-09 11:34:56 +02:00
inventory.c parisc: Add Page Deallocation Table (PDT) support 2017-05-12 09:14:15 +02:00
irq.c parisc: Increase thread and stack size to 32kb 2017-07-31 08:41:26 +02:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
module.c mm, vmalloc: use __GFP_HIGHMEM implicitly 2017-05-08 17:15:13 -07:00
pa7300lc.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pacache.S parisc: Remove unnecessary TLB purges from flush_dcache_page_asm and flush_icache_page_asm 2016-12-07 09:01:21 +01:00
parisc_ksyms.c parisc: Export __cmpxchg_u64 unconditionally 2017-10-19 08:48:45 +02:00
pci-dma.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pci.c parisc: Use generic pci_mmap_resource_range() 2017-04-20 08:47:47 -05:00
pdc_chassis.c
pdc_cons.c
pdt.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
perf_asm.S
perf_images.h
perf.c parisc: Static initialization of spinlocks in perf and unwind code 2017-08-22 16:34:33 +02:00
process.c parisc, watchdog/core: Use lockup_detector_stop() 2017-09-14 11:41:03 +02:00
processor.c parisc: Move init_per_cpu() into init section 2017-09-22 19:47:08 +02:00
ptrace.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
real2.S parisc: Make existing core files reuseable for bootloader 2017-08-22 16:34:35 +02:00
setup.c parisc: Move init_per_cpu() into init section 2017-09-22 19:47:08 +02:00
signal.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
signal32.c signal: Remove kernel interal si_code magic 2017-07-24 14:30:28 -05:00
signal32.h
smp.c parisc: Move init_per_cpu() into init section 2017-09-22 19:47:08 +02:00
stacktrace.c
sys_parisc.c mm: larger stack guard gap, between vmas 2017-06-19 21:50:20 +08:00
sys_parisc32.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
syscall_table.S parisc: use compat_sys_keyctl() 2017-07-02 22:10:47 +02:00
syscall.S parisc: Fix validity check of pointer size argument in new CAS implementation 2017-11-17 15:27:13 +01:00
time.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
topology.c
traps.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
unaligned.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/debug.h> 2017-03-02 08:42:34 +01:00
unwind.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
vmlinux.lds.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00