linux/arch/ppc
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
..
4xx_io Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
8xx_io [PATCH] gfp_t: sound 2005-10-28 08:16:50 -07:00
8260_io Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
amiga Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
boot [PATCH] ppc32 ld.script fix for building on ppc64 2005-09-29 08:46:27 -07:00
configs [PATCH] ppc32: cpci690 updates 2005-09-05 00:06:01 -07:00
kernel [PATCH] mm: init_mm without ptlock 2005-10-29 21:40:40 -07:00
lib [LIB]: Consolidate _atomic_dec_and_lock() 2005-09-14 21:47:01 -07:00
math-emu Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
mm [PATCH] mm: init_mm without ptlock 2005-10-29 21:40:40 -07:00
oprofile Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
platforms [PATCH] ppc: Fix timekeeping with HZ=250 on some Mac models 2005-10-05 07:33:42 -07:00
syslib [PATCH] useless includes of linux/irq.h (arch/ppc) 2005-09-30 08:54:02 -07:00
xmon [PATCH] ppc32: Kill embedded system.map, use kallsyms 2005-06-21 18:46:26 -07:00
Kconfig [LIB]: Consolidate _atomic_dec_and_lock() 2005-09-14 21:47:01 -07:00
Kconfig.debug [PATCH] ppc32: mv64x60 updates & enhancements 2005-09-05 00:06:00 -07:00
Makefile kbuild: rename prepare to archprepare to fix dependency chain 2005-09-11 22:30:22 +02:00