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Linus Torvalds b235beea9e Clarify naming of thread info/stack allocators 
We've had the thread info allocated together with the thread stack for
most architectures for a long time (since the thread_info was split off
from the task struct), but that is about to change.

But the patches that move the thread info to be off-stack (and a part of
the task struct instead) made it clear how confused the allocator and
freeing functions are.

Because the common case was that we share an allocation with the thread
stack and the thread_info, the two pointers were identical.  That
identity then meant that we would have things like

	ti = alloc_thread_info_node(tsk, node);
	...
	tsk->stack = ti;

which certainly _worked_ (since stack and thread_info have the same
value), but is rather confusing: why are we assigning a thread_info to
the stack? And if we move the thread_info away, the "confusing" code
just gets to be entirely bogus.

So remove all this confusion, and make it clear that we are doing the
stack allocation by renaming and clarifying the function names to be
about the stack.  The fact that the thread_info then shares the
allocation is an implementation detail, and not really about the
allocation itself.

This is a pure renaming and type fix: we pass in the same pointer, it's
just that we clarify what the pointer means.

The ia64 code that actually only has one single allocation (for all of
task_struct, thread_info and kernel thread stack) now looks a bit odd,
but since "tsk->stack" is actually not even used there, that oddity
doesn't matter.  It would be a separate thing to clean that up, I
intentionally left the ia64 changes as a pure brute-force renaming and
type change.

Acked-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-06-24 15:09:37 -07:00
..
native ia64: remove paravirt code 2015-06-10 14:26:32 -07:00
sn ia64: Fix misspellings in comments. 2016-04-18 12:45:54 +02:00
uv ia64: Replace __get_cpu_var uses 2014-08-26 13:45:52 -04:00
acenv.h ACPICA: Linux: Add support to exclude <asm/acenv.h> inclusion. 2014-07-23 01:10:44 +02:00
acpi-ext.h
acpi.h ia64: fix up obsolete cpu function usage. 2015-03-05 15:25:04 +10:30
agp.h
asm-offsets.h
asmmacro.h
atomic.h atomic, arch: Audit atomic_{read,set}() 2015-09-23 09:54:28 +02:00
barrier.h ia64: define __smp_xxx 2016-01-12 20:46:55 +02:00
bitops.h arch,ia64: Convert smp_mb__*() 2014-04-18 14:20:35 +02:00
bug.h
bugs.h
cache.h
cacheflush.h
checksum.h ipv6: Pass proto to csum_ipv6_magic as __u8 instead of unsigned short 2016-03-13 23:55:13 -04:00
clocksource.h clocksource: Change __ARCH_HAS_CLOCKSOURCE_DATA to a CONFIG option 2011-07-21 13:34:05 -07:00
cpu.h
cputime.h cputime: Generic on-demand virtual cputime accounting 2013-01-27 19:23:27 +01:00
current.h
cyclone.h
delay.h
device.h driver core / ACPI: Move ACPI support to core device and driver types 2012-11-15 00:28:00 +01:00
div64.h
dma-mapping.h dma-mapping: always provide the dma_map_ops based implementation 2016-01-20 17:09:18 -08:00
dma.h
dmi.h firmware/dmi_scan: generalize for use by other archs 2014-01-23 16:36:57 -08:00
early_ioremap.h ia64: split off early_ioremap() declarations into asm/early_ioremap.h 2016-01-13 10:35:14 -08:00
elf.h default SET_PERSONALITY() in linux/elf.h 2013-02-26 02:46:08 -05:00
emergency-restart.h
esi.h
fb.h
fpswa.h
ftrace.h
futex.h Wrong asm register contraints in the futex implementation 2013-03-19 16:14:53 -07:00
gcc_intrin.h UAPI: (Scripted) Disintegrate arch/ia64/include/asm 2012-10-09 09:47:00 +01:00
hardirq.h
hpsim.h hpsim, initialize chip for assigned irqs 2012-03-08 12:26:30 -08:00
hugetlb.h mm/hugetlb: remove arch_prepare/release_hugepage from arch headers 2015-06-25 17:00:35 -07:00
hw_irq.h ia64: remove paravirt code 2015-06-10 14:26:32 -07:00
idle.h
intrinsics.h ia64: remove paravirt code 2015-06-10 14:26:32 -07:00
io.h ia64: define ioremap_uc() 2016-03-17 15:09:34 -07:00
iommu.h x86/cpufeature: Remove cpu_has_x2apic 2016-03-31 13:35:08 +02:00
iommu_table.h
iosapic.h ia64: remove paravirt code 2015-06-10 14:26:32 -07:00
irq.h genirq: Make create/destroy_irq() ia64 private 2014-05-16 14:05:21 +02:00
irq_regs.h
irq_remapping.h iommu/vt-d: Refine the interfaces to create IRQ for DMAR unit 2015-04-24 15:36:49 +02:00
irqflags.h [IA64] Fix include dependency in asm/irqflags.h 2013-06-17 13:39:52 -07:00
Kbuild Merge branch 'strscpy' of git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile 2015-10-04 16:31:13 +01:00
kdebug.h
kexec.h Disintegrate asm/system.h for IA64 2012-03-28 18:30:02 +01:00
kmap_types.h
kprobes.h
kregs.h
libata-portmap.h
linkage.h consolidate cond_syscall and SYSCALL_ALIAS declarations 2013-03-03 22:55:19 -05:00
local.h
local64.h
machvec.h ia64/xen: Remove Xen support for ia64 2013-12-10 16:11:07 -08:00
machvec_dig.h [IA64] Rename platform_name to ia64_platform_name 2012-07-25 11:47:16 -07:00
machvec_dig_vtd.h [IA64] Rename platform_name to ia64_platform_name 2012-07-25 11:47:16 -07:00
machvec_hpsim.h [IA64] Rename platform_name to ia64_platform_name 2012-07-25 11:47:16 -07:00
machvec_hpzx1.h [IA64] Rename platform_name to ia64_platform_name 2012-07-25 11:47:16 -07:00
machvec_hpzx1_swiotlb.h [IA64] Rename platform_name to ia64_platform_name 2012-07-25 11:47:16 -07:00
machvec_init.h
machvec_sn2.h [IA64] Rename platform_name to ia64_platform_name 2012-07-25 11:47:16 -07:00
machvec_uv.h [IA64] Rename platform_name to ia64_platform_name 2012-07-25 11:47:16 -07:00
mc146818rtc.h
mca.h Fix initialization of CMCI/CMCP interrupts 2013-04-02 09:37:06 -07:00
mca_asm.h Disintegrate asm/system.h for IA64 2012-03-28 18:30:02 +01:00
meminit.h ia64/xen: Remove Xen support for ia64 2013-12-10 16:11:07 -08:00
mman.h UAPI: (Scripted) Disintegrate arch/ia64/include/asm 2012-10-09 09:47:00 +01:00
mmu.h
mmu_context.h
mmzone.h
module.h ia64: remove paravirt code 2015-06-10 14:26:32 -07:00
msidef.h
mutex.h arch: Make __mutex_fastpath_lock_retval return whether fastpath succeeded or not 2013-06-26 12:10:55 +02:00
nodedata.h
numa.h Fix build error for numa_clear_node() under IA64 2013-04-02 09:39:48 -07:00
page.h libnvdimm, pfn, pmem: allocate memmap array in persistent memory 2016-01-15 17:56:32 -08:00
pal.h Fix common misspellings 2011-03-31 11:26:23 -03:00
param.h UAPI: (Scripted) Disintegrate arch/ia64/include/asm 2012-10-09 09:47:00 +01:00
parport.h IA64: drivers: remove __dev* attributes. 2013-01-03 15:57:13 -08:00
patch.h
pci.h PCI: Move pci_dma_* helpers to common code 2016-03-07 10:40:02 -06:00
percpu.h percpu: remove PERCPU_ENOUGH_ROOM which is stale definition 2015-11-16 10:50:25 -05:00
perfmon.h UAPI: (Scripted) Disintegrate arch/ia64/include/asm 2012-10-09 09:47:00 +01:00
pgalloc.h ia64: expose number of page table levels on Kconfig level 2015-04-14 16:49:02 -07:00
pgtable.h ia64: expose number of page table levels on Kconfig level 2015-04-14 16:49:02 -07:00
processor.h sched, mips, ia64: Remove __ARCH_WANT_UNLOCKED_CTXSW 2014-09-24 14:47:05 +02:00
ptrace.h new helper: current_user_stack_pointer() 2012-12-19 18:07:39 -05:00
rwsem.h locking/rwsem, ia64: Provide __down_write_killable() 2016-04-13 10:42:21 +02:00
sal.h Disintegrate asm/system.h for IA64 2012-03-28 18:30:02 +01:00
sections.h ia64: remove duplicate declarations of __per_cpu_start[] and __per_cpu_end[] 2014-10-14 02:18:28 +02:00
segment.h
serial.h
shmparam.h
siginfo.h UAPI: (Scripted) Disintegrate arch/ia64/include/asm 2012-10-09 09:47:00 +01:00
signal.h consolidate kernel-side struct sigaction declarations 2013-02-03 15:09:22 -05:00
smp.h IA64: drivers: remove __dev* attributes. 2013-01-03 15:57:13 -08:00
sparsemem.h
spinlock.h lockref: Implement lockref for Itanium 2013-09-04 17:18:56 -07:00
spinlock_types.h
string.h
swiotlb.h
switch_to.h ia64: Replace __get_cpu_var uses 2014-08-26 13:45:52 -04:00
syscall.h ARCH: AUDIT: implement syscall_get_arch for all arches 2014-09-23 16:20:10 -04:00
termios.h UAPI: (Scripted) Disintegrate arch/ia64/include/asm 2012-10-09 09:47:00 +01:00
thread_info.h Clarify naming of thread info/stack allocators 2016-06-24 15:09:37 -07:00
timex.h
tlb.h mm: split 'tlb_flush_mmu()' into tlb flushing and memory freeing parts 2014-04-25 16:05:40 -07:00
tlbflush.h
topology.h sched/topology: Rename topology_thread_cpumask() to topology_sibling_cpumask() 2015-05-27 15:22:15 +02:00
types.h UAPI: (Scripted) Disintegrate arch/ia64/include/asm 2012-10-09 09:47:00 +01:00
uaccess.h ia64/extable: use generic search and sort routines 2016-03-22 15:36:02 -07:00
unaligned.h
uncached.h
unistd.h [IA64] Enable preadv2 and pwritev2 syscalls for ia64 2016-03-25 14:37:32 -07:00
unwind.h
user.h
ustack.h UAPI: (Scripted) Disintegrate arch/ia64/include/asm 2012-10-09 09:47:00 +01:00
vga.h
xor.h