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James Bottomley 618febd678 [PARISC] Fix the alloc_slabmgmt panic 
Fix the alloc_slabmgmt panic

Hopefully this should also fix a lot of other intermittent kernel bugs.

The problem has been around since 2.6.9-rc2-pa6 when we allowed
floating point registers to be used in kernel code.  The essence of
the problem is that gcc prefers to use floating point for integer
divides and multiples.  Further, it can rely on the values in the no
clobber fp regs being correct across a function call.  Unfortunately,
our task switch function only saves the integer no clobber registers,
not the fp ones, so if gcc makes a function call to any function in
the kernel which could sleep, the values it is relying on in any no
clobber floating point register may be lost.  In the case of
alloc_slabmgmt, the value of the page offset is being stored in %fr12
across a call to kmem_getpages(), which sleeps if no pages are
available.  Thus, the offset can be trashed and the slab code can end
up with a completely bogus address leading to corruption.

Kudos to Randolph who came up with the program to trip this problem at
will and thus allowed it to be tracked and fixed.

Signed-off-by: James Bottomley <jejb@parisc-linux.org>

Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
 		2005-10-21 22:53:26 -04:00
..
a.out.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
asmregs.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
assembly.h [PARISC] Fix the alloc_slabmgmt panic 2005-10-21 22:53:26 -04:00
atomic.h [PATCH] spinlock consolidation 2005-09-10 10:06:21 -07:00
auxvec.h [PATCH] auxiliary vector cleanups 2005-09-07 16:57:21 -07:00
bitops.h [PARISC] Update bitops from parisc tree 2005-10-21 22:45:22 -04:00
bug.h [PATCH] remove all kernel BUGs 2005-05-01 08:59:01 -07:00
bugs.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
byteorder.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
cache.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
cacheflush.h [PATCH] spinlock consolidation 2005-09-10 10:06:21 -07:00
checksum.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
compat.h [PATCH] compat: be more consistent about [ug]id_t 2005-09-07 16:57:19 -07:00
compat_rt_sigframe.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
compat_signal.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
compat_ucontext.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
cputime.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
current.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
delay.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
div64.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
dma-mapping.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
dma.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
eisa_bus.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
eisa_eeprom.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
elf.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
emergency-restart.h [PATCH] Add emergency_restart() 2005-07-26 14:35:41 -07:00
errno.h [PATCH] add EOWNERDEAD and ENOTRECOVERABLE version 2 2005-05-01 08:59:06 -07:00
fcntl.h [PATCH] Clean up struct flock64 definitions 2005-09-07 16:57:38 -07:00
fixmap.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
floppy.h [PATCH] make some things static 2005-05-05 16:36:47 -07:00
futex.h [PATCH] Remove unused var from asm/futex.h 2005-09-21 16:16:29 -07:00
grfioctl.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
hardirq.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
hardware.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
hw_irq.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
ide.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
io.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
ioctl.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
ioctls.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
iosapic.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
ipcbuf.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
irq.h [PATCH] CHECK_IRQ_PER_CPU() to avoid dead code in __do_IRQ() 2005-09-07 16:57:29 -07:00
kmap_types.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
led.h [PARISC] Use work queue in LED/LCD driver instead of tasklet. 2005-10-21 22:46:18 -04:00
linkage.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
local.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
machdep.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
mc146818rtc.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
mman.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
mmu.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
mmu_context.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
mmzone.h [PATCH] remove non-DISCONTIG use of pgdat->node_mem_map 2005-06-23 09:45:00 -07:00
module.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
msgbuf.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
namei.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
numnodes.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
page.h [PATCH] mm: consolidate get_order 2005-09-05 00:05:39 -07:00
param.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
parisc-device.h [PARISC] Convert parisc_device to use struct resource for hpa 2005-10-21 22:36:40 -04:00
parport.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
pci.h [PARISC] Fix compile warning in pci.h 2005-10-21 22:49:05 -04:00
pdc.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
pdc_chassis.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
pdcpat.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
percpu.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
perf.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
pgalloc.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
pgtable.h [PATCH] feature removal of io_remap_page_range() 2005-09-13 08:22:33 -07:00
poll.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
posix_types.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
processor.h [PARISC] Add ability for prctl to change unaligned trap behaviour 2005-10-21 22:43:15 -04:00
psw.h [PARISC] Make sure use of RFI conforms to PA 2.0 and 1.1 arch docs 2005-10-21 22:40:07 -04:00
ptrace.h [PARISC] Take into account nullified insn and lock functions for profiling 2005-10-21 22:42:18 -04:00
real.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
resource.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
rt_sigframe.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
rtc.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
runway.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
scatterlist.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sections.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
segment.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
semaphore-helper.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
semaphore.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sembuf.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
serial.h [PATCH] Serial: Split 8250 port table (part 2) 2005-06-29 18:45:19 +01:00
setup.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
shmbuf.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
shmparam.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sigcontext.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
siginfo.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
signal.h [PATCH] move SA_xxx defines to linux/signal.h 2005-05-01 08:59:02 -07:00
smp.h [PATCH] smp_processor_id() cleanup 2005-06-21 18:46:13 -07:00
socket.h [NET]: Introduce SO_{SND,RCV}BUFFORCE socket options 2005-08-29 15:31:35 -07:00
sockios.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
spinlock.h [PARISC] Update spinlocks from parisc tree 2005-10-21 22:41:25 -04:00
spinlock_types.h [PARISC] Update spinlocks from parisc tree 2005-10-21 22:41:25 -04:00
stat.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
statfs.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
string.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
superio.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
system.h [PARISC] Update spinlocks from parisc tree 2005-10-21 22:41:25 -04:00
termbits.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
termios.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
thread_info.h [PATCH] streamline preempt_count type across archs 2005-06-23 09:45:19 -07:00
timex.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
tlb.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
tlbflush.h [PARISC] Move pa_tlb_lock to tlb_flush.h 2005-10-21 22:40:24 -04:00
topology.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
traps.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
types.h [PARISC] Update bitops from parisc tree 2005-10-21 22:45:22 -04:00
uaccess.h [PATCH] remove verify_area(): remove verify_area() from various uaccess.h headers 2005-09-07 16:57:35 -07:00
ucontext.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
unaligned.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
unistd.h [PARISC] Add new ioprio_{set,get} syscalls 2005-10-21 22:45:57 -04:00
unwind.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
user.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
xor.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00