linux/arch/m68k
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
..
amiga [PATCH] timer initialization cleanup: DEFINE_TIMER 2005-09-09 14:03:48 -07:00
apollo Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
atari [PATCH] mm: m68k kill stram swap 2005-10-29 21:40:38 -07:00
bvme6000 [PATCH] move m68k rtc drivers over to initcalls 2005-09-07 16:57:23 -07:00
configs [PATCH] M68k: Mark Sun-3 NCR5380 SCSI broken 2005-06-12 20:43:22 -07:00
fpsp040 kbuild: m68k,parisc,ppc,ppc64,s390,xtensa use generic asm-offsets.h support 2005-09-09 20:57:26 +02:00
hp300 Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
ifpsp060 kbuild: m68k,parisc,ppc,ppc64,s390,xtensa use generic asm-offsets.h support 2005-09-09 20:57:26 +02:00
kernel kbuild: m68k,parisc,ppc,ppc64,s390,xtensa use generic asm-offsets.h support 2005-09-09 20:57:26 +02:00
lib [PATCH] m68k: cleanup inline mem functions 2005-09-05 00:06:19 -07:00
mac [PATCH] timer initialization cleanup: DEFINE_TIMER 2005-09-09 14:03:48 -07:00
math-emu kbuild: m68k,parisc,ppc,ppc64,s390,xtensa use generic asm-offsets.h support 2005-09-09 20:57:26 +02:00
mm [PATCH] mm: init_mm without ptlock 2005-10-29 21:40:40 -07:00
mvme16x [PATCH] move m68k rtc drivers over to initcalls 2005-09-07 16:57:23 -07:00
mvme147 Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
q40 Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sun3 Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sun3x [PATCH] mm: init_mm without ptlock 2005-10-29 21:40:40 -07:00
tools/amiga Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
defconfig [PATCH] M68k: Update defconfigs 2005-06-12 20:43:21 -07:00
Kconfig [PATCH] mm: m68k kill stram swap 2005-10-29 21:40:38 -07:00
Kconfig.debug Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
Makefile kbuild: m68k,parisc,ppc,ppc64,s390,xtensa use generic asm-offsets.h support 2005-09-09 20:57:26 +02:00