android_kernel_xiaomi_sm8350/arch/ppc/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
..
align.c [PATCH] ppc32: Fix address checking on lmw/stmw align exception 2005-05-01 08:58:42 -07:00
asm-offsets.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
bitops.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
cpu_setup_6xx.S [PATCH] merge some from Rusty's trivial patches 2005-09-10 10:06:30 -07:00
cpu_setup_power4.S [PATCH] merge some from Rusty's trivial patches 2005-09-10 10:06:30 -07:00
cputable.c [PATCH] ppc32: Tell userland about lack of standard TB 2005-10-12 08:24:47 -07:00
dma-mapping.c [PATCH] mm: init_mm without ptlock 2005-10-29 21:40:40 -07:00
entry.S kbuild: m68k,parisc,ppc,ppc64,s390,xtensa use generic asm-offsets.h support 2005-09-09 20:57:26 +02:00
fpu.S kbuild: m68k,parisc,ppc,ppc64,s390,xtensa use generic asm-offsets.h support 2005-09-09 20:57:26 +02:00
head_4xx.S kbuild: m68k,parisc,ppc,ppc64,s390,xtensa use generic asm-offsets.h support 2005-09-09 20:57:26 +02:00
head_8xx.S kbuild: m68k,parisc,ppc,ppc64,s390,xtensa use generic asm-offsets.h support 2005-09-09 20:57:26 +02:00
head_44x.S kbuild: m68k,parisc,ppc,ppc64,s390,xtensa use generic asm-offsets.h support 2005-09-09 20:57:26 +02:00
head_booke.h [PATCH] ppc32: Add support for Freescale e200 (Book-E) core 2005-06-25 16:24:26 -07:00
head_fsl_booke.S kbuild: m68k,parisc,ppc,ppc64,s390,xtensa use generic asm-offsets.h support 2005-09-09 20:57:26 +02:00
head.S [PATCH] ppc32: support hotplug cpu on powermacs 2005-09-10 10:15:11 -07:00
idle_6xx.S kbuild: m68k,parisc,ppc,ppc64,s390,xtensa use generic asm-offsets.h support 2005-09-09 20:57:26 +02:00
idle_power4.S kbuild: m68k,parisc,ppc,ppc64,s390,xtensa use generic asm-offsets.h support 2005-09-09 20:57:26 +02:00
idle.c [PATCH] ppc32: support hotplug cpu on powermacs 2005-09-10 10:15:11 -07:00
irq.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
l2cr.S [PATCH] ppc: L2 cache prefetch fixes on 745x 2005-09-01 10:52:29 -07:00
machine_kexec.c [PATCH] kexec-ppc: fix for ksysfs crash_notes 2005-07-12 16:01:03 -07:00
Makefile [PATCH] ppc32: fix build with oprofile 2005-09-22 22:17:34 -07:00
misc.S kbuild: m68k,parisc,ppc,ppc64,s390,xtensa use generic asm-offsets.h support 2005-09-09 20:57:26 +02:00
module.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
pci.c [PATCH] PCI: fix up pretty-names removal patch 2005-09-08 14:57:24 -07:00
perfmon_fsl_booke.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
perfmon.c [PATCH] ppc: fix stupid thinko in oprofile fix 2005-09-28 07:46:41 -07:00
ppc_htab.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
ppc_ksyms.c [PATCH] ppc32: export cacheable_memcpy() 2005-09-05 00:06:00 -07:00
ppc-stub.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
process.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
ptrace.c Add CONFIG_AUDITSC and CONFIG_SECCOMP support for ppc32 2005-05-08 15:56:09 +01:00
relocate_kernel.S [PATCH] ppc32: use correct register names in arch/ppc/kernel/relocate_kernel.S 2005-06-30 08:45:09 -07:00
semaphore.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
setup.c [PATCH] ppc32: Cleaned up global namespace of Book-E watchdog variables 2005-09-05 00:05:57 -07:00
signal.c [PATCH] convert signal handling of NODEFER to act like other Unix boxes. 2005-08-29 10:03:11 -07:00
smp-tbsync.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
smp.c [PATCH] ppc32: support hotplug cpu on powermacs 2005-09-10 10:15:11 -07:00
softemu8xx.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
swsusp.S kbuild: m68k,parisc,ppc,ppc64,s390,xtensa use generic asm-offsets.h support 2005-09-09 20:57:26 +02:00
syscalls.c [PATCH] powerpc: Make check_bugs() static inline 2005-09-09 22:11:35 +10:00
temp.c [PATCH] ppc32: remove use of asm/segment.h 2005-09-13 08:22:28 -07:00
time.c [PATCH] ppc32: remove use of asm/segment.h 2005-09-13 08:22:28 -07:00
traps.c [PATCH] ppc32: Kill init on unhandled synchronous signals 2005-09-10 10:15:11 -07:00
vecemu.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
vector.S Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
vmlinux.lds.S [PATCH] ppc32: discard *.exit.text and *.exit.data sections 2005-09-13 08:22:28 -07:00