Robin Holt 34441427aa revert "procfs: provide stack information for threads" and its fixup commits ... Originally, commit d899bf7b ("procfs: provide stack information for threads") attempted to introduce a new feature for showing where the threadstack was located and how many pages are being utilized by the stack. Commit c44972f1 ("procfs: disable per-task stack usage on NOMMU") was applied to fix the NO_MMU case. Commit 89240ba0 ("x86, fs: Fix x86 procfs stack information for threads on 64-bit") was applied to fix a bug in ia32 executables being loaded. Commit 9ebd4eba7 ("procfs: fix /proc/<pid>/stat stack pointer for kernel threads") was applied to fix a bug which had kernel threads printing a userland stack address. Commit 1306d603f ('proc: partially revert "procfs: provide stack information for threads"') was then applied to revert the stack pages being used to solve a significant performance regression. This patch nearly undoes the effect of all these patches. The reason for reverting these is it provides an unusable value in field 28. For x86_64, a fork will result in the task->stack_start value being updated to the current user top of stack and not the stack start address. This unpredictability of the stack_start value makes it worthless. That includes the intended use of showing how much stack space a thread has. Other architectures will get different values. As an example, ia64 gets 0. The do_fork() and copy_process() functions appear to treat the stack_start and stack_size parameters as architecture specific. I only partially reverted c44972f1 ("procfs: disable per-task stack usage on NOMMU") . If I had completely reverted it, I would have had to change mm/Makefile only build pagewalk.o when CONFIG_PROC_PAGE_MONITOR is configured. Since I could not test the builds without significant effort, I decided to not change mm/Makefile. I only partially reverted 89240ba0 ("x86, fs: Fix x86 procfs stack information for threads on 64-bit") . I left the KSTK_ESP() change in place as that seemed worthwhile. Signed-off-by: Robin Holt <holt@sgi.com> Cc: Stefani Seibold <stefani@seibold.net> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Michal Simek <monstr@monstr.eu> Cc: Ingo Molnar <mingo@elte.hu> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2010-05-11 17:33:41 -07:00
..
acpi	acpi: Support IBM SMBus CMI devices	2010-03-24 14:38:37 +01:00
asm-generic	dma-mapping: fix dma_sync_single_range_*	2010-05-11 17:33:41 -07:00
crypto
drm	Merge branch 'drm-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6	2010-05-07 14:02:01 -07:00
keys
linux	revert "procfs: provide stack information for threads" and its fixup commits	2010-05-11 17:33:41 -07:00
math-emu
media	V4L/DVB: saa7146: fix regression of the av7110/budget-av driver	2010-05-06 19:20:50 -03:00
mtd
net	sctp: Fix a race between ICMP protocol unreachable and connect()	2010-05-06 00:56:07 -07:00
pcmcia	pcmcia: pcmcia_dev_present bugfix	2010-04-21 08:09:17 +02:00
rdma
rxrpc
scsi	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
sound	Merge branch 'fix/asoc' into for-linus	2010-04-07 09:54:41 +02:00
trace	Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block	2010-04-09 11:50:29 -07:00
video	broadsheetfb: support storing waveform	2010-03-12 15:52:34 -08:00
xen	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
Kbuild