android_kernel_motorola_sm6225/arch/parisc/kernel
Hugh Dickins 872fec16d9 [PATCH] mm: init_mm without ptlock
First step in pushing down the page_table_lock.  init_mm.page_table_lock has
been used throughout the architectures (usually for ioremap): not to serialize
kernel address space allocation (that's usually vmlist_lock), but because
pud_alloc,pmd_alloc,pte_alloc_kernel expect caller holds it.

Reverse that: don't lock or unlock init_mm.page_table_lock in any of the
architectures; instead rely on pud_alloc,pmd_alloc,pte_alloc_kernel to take
and drop it when allocating a new one, to check lest a racing task already
did.  Similarly no page_table_lock in vmalloc's map_vm_area.

Some temporary ugliness in __pud_alloc and __pmd_alloc: since they also handle
user mms, which are converted only by a later patch, for now they have to lock
differently according to whether or not it's init_mm.

If sources get muddled, there's a danger that an arch source taking
init_mm.page_table_lock will be mixed with common source also taking it (or
neither take it).  So break the rules and make another change, which should
break the build for such a mismatch: remove the redundant mm arg from
pte_alloc_kernel (ppc64 scrapped its distinct ioremap_mm in 2.6.13).

Exceptions: arm26 used pte_alloc_kernel on user mm, now pte_alloc_map; ia64
used pte_alloc_map on init_mm, now pte_alloc_kernel; parisc had bad args to
pmd_alloc and pte_alloc_kernel in unused USE_HPPA_IOREMAP code; ppc64
map_io_page forgot to unlock on failure; ppc mmu_mapin_ram and ppc64 im_free
took page_table_lock for no good reason.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-29 21:40:40 -07:00
..
asm-offsets.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
binfmt_elf32.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
cache.c [PARISC] Fix parisc_setup_cache_timing to choose a better flush threshold 2005-10-21 22:44:14 -04:00
drivers.c [PARISC] Convert parisc_device tree to use struct device klists 2005-10-21 22:33:38 -04:00
entry.S [PARISC] Remove the spurious do_softirq calls from entry.S 2005-10-21 22:54:38 -04:00
firmware.c [PARISC] Document history of PDC_NARROW as it is now obsolete 2005-10-21 22:51:40 -04:00
hardware.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
head.S [PARISC] Replace uses of __LP64__ with CONFIG_64BIT 2005-10-21 22:46:48 -04:00
hpmc.S Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
init_task.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
inventory.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
ioctl32.c [PARISC] kfree cleanups to ioctl32.c 2005-10-21 22:51:23 -04:00
irq.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
Makefile Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
module.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
pa7300lc.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
pacache.S [PARISC] Explicitly specify sr4 when flushing kernel space 2005-10-21 22:56:14 -04:00
parisc_ksyms.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
pci-dma.c [PATCH] mm: init_mm without ptlock 2005-10-29 21:40:40 -07:00
pci.c [PARISC] More informative error message in pcibios_link_hba_resources 2005-10-21 22:50:33 -04:00
pdc_chassis.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
pdc_cons.c [PARISC] Update pdc console from parisc tree 2005-10-21 22:50:06 -04:00
perf.c [PARISC] Convert parisc_device to use struct resource for hpa 2005-10-21 22:36:40 -04:00
perf_asm.S Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
perf_images.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
process.c [PARISC] Implement 5 argument clone. 2005-10-21 22:53:04 -04:00
processor.c [PARISC] Convert parisc_device to use struct resource for hpa 2005-10-21 22:36:40 -04:00
ptrace.c kbuild: m68k,parisc,ppc,ppc64,s390,xtensa use generic asm-offsets.h support 2005-09-09 20:57:26 +02:00
real2.S [PARISC] Properly specify section alignment for real2.S 2005-10-21 22:56:53 -04:00
semaphore.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
setup.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
signal.c [PARISC] Properly specify index field to I/D cache flush ops 2005-10-21 22:55:51 -04:00
signal32.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
signal32.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
smp.c [PARISC] Replace uses of __LP64__ with CONFIG_64BIT 2005-10-21 22:46:48 -04:00
sys32.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sys_parisc.c [PATCH] consolidate sys_shmat 2005-05-01 08:59:12 -07:00
sys_parisc32.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
syscall.S [PARISC] Replace uses of __LP64__ with CONFIG_64BIT 2005-10-21 22:46:48 -04:00
syscall_table.S [PARISC] Replace uses of __LP64__ with CONFIG_64BIT 2005-10-21 22:46:48 -04:00
time.c [PARISC] Use work queue in LED/LCD driver instead of tasklet. 2005-10-21 22:46:18 -04:00
topology.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
traps.c [PARISC] Add printing of fpregs state to stack dump 2005-10-21 22:49:25 -04:00
unaligned.c [PARISC] Add ability for prctl to change unaligned trap behaviour 2005-10-21 22:43:15 -04:00
unwind.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
vmlinux.lds.S Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00