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b7d4581844
linux/arch/parisc/kernel
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James Bottomley b7d4581844 [PARISC] prevent speculative re-read on cache flush 
According to Appendix F, the TLB is the primary arbiter of speculation.
Thus, if a page has a TLB entry, it may be speculatively read into the
cache.  On linux, this can cause us incoherencies because if we're about
to do a disk read, we call get_user_pages() to do the flush/invalidate
in user space, but we still potentially have the user TLB entries, and
the cache could speculate the lines back into userspace (thus causing
stale data to be used).  This is fixed by purging the TLB entries before
we flush through the tmpalias space.  Now, the only way the line could
be re-speculated is if the user actually tries to touch it (which is not
allowed).

Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2011-04-15 12:55:56 -05:00
..
.gitignore
asm-offsets.c parisc: Use of align_frame provides stack frame. 2010-05-30 05:38:27 -04:00
binfmt_elf32.c
cache.c [PARISC] prevent speculative re-read on cache flush 2011-04-15 12:55:56 -05:00
drivers.c
entry.S [PARISC] only make executable areas executable 2011-04-15 12:55:18 -05:00
firmware.c parisc : Remove broken line wrapping handling pdc_iodc_print() 2011-01-15 08:39:08 -06:00
ftrace.c sched_clock: Add local_clock() API and improve documentation 2010-06-09 10:34:49 +02:00
hardware.c
head.S [PARISC] only make executable areas executable 2011-04-15 12:55:18 -05:00
hpmc.S
init_task.c Rename .data.vmpages and .data.vm0.XXX to .data..vmpages and .data..vm0.XXX. 2010-03-03 11:26:00 +01:00
inventory.c Fix common misspellings 2011-03-31 11:26:23 -03:00
irq.c parisc: Use irq_to_desc() in show_interrupts() 2011-03-29 14:48:08 +02:00
Makefile
module.c [PARISC] only make executable areas executable 2011-04-15 12:55:18 -05:00
pa7300lc.c
pacache.S parisc: flush pages through tmpalias space 2011-01-15 08:44:40 -06:00
parisc_ksyms.c
pci-dma.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
pci.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
pdc_chassis.c
pdc_cons.c console: rename acquire/release_console_sem() to console_lock/unlock() 2011-01-26 10:50:06 +10:00
perf_asm.S
perf_images.h
perf.c parisc: remove big kernel lock 2010-10-16 22:43:08 +02:00
process.c Make do_execve() take a const filename pointer 2010-08-17 18:07:43 -07:00
processor.c parisc: processor.c, fix bloated stack frame 2009-07-03 03:34:11 +00:00
ptrace.c ptrace: cleanup arch_ptrace() on parisc 2010-10-27 18:03:11 -07:00
real2.S
setup.c parisc: remove CVS keywords 2009-07-03 03:34:06 +00:00
signal32.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
signal32.h
signal.c Fix common misspellings 2011-03-31 11:26:23 -03:00
smp.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
stacktrace.c
sys32.h
sys_parisc32.c BKL: remove extraneous #include <smp_lock.h> 2010-11-17 08:59:32 -08:00
sys_parisc.c improve sys_newuname() for compat architectures 2010-03-12 15:52:32 -08:00
syscall_table.S Fix common misspellings 2011-03-31 11:26:23 -03:00
syscall.S Fix common misspellings 2011-03-31 11:26:23 -03:00
time.c parisc: Switch do_timer() to xtime_update() 2011-01-31 14:55:46 +01:00
topology.c
traps.c parisc: fix warning in traps.c 2009-08-28 19:37:20 -10:00
unaligned.c arch/parisc: Removing undead ifdef CONFIG_PA20 2010-10-21 21:13:29 -04:00
unwind.c parisc: unwind - optimise linked-list searches for modules 2010-10-21 21:12:19 -04:00
vmlinux.lds.S [PARISC] only make executable areas executable 2011-04-15 12:55:18 -05:00