linux-sg2042/include
Tejun Heo 1a51e3a0ae x86: fold pda into percpu area on SMP
[ Based on original patch from Christoph Lameter and Mike Travis. ]

Currently pdas and percpu areas are allocated separately.  %gs points
to local pda and percpu area can be reached using pda->data_offset.
This patch folds pda into percpu area.

Due to strange gcc requirement, pda needs to be at the beginning of
the percpu area so that pda->stack_canary is at %gs:40.  To achieve
this, a new percpu output section macro - PERCPU_VADDR_PREALLOC() - is
added and used to reserve pda sized chunk at the start of the percpu
area.

After this change, for boot cpu, %gs first points to pda in the
data.init area and later during setup_per_cpu_areas() gets updated to
point to the actual pda.  This means that setup_per_cpu_areas() need
to reload %gs for CPU0 while clearing pda area for other cpus as cpu0
already has modified it when control reaches setup_per_cpu_areas().

This patch also removes now unnecessary get_local_pda() and its call
sites.

A lot of this patch is taken from Mike Travis' "x86_64: Fold pda into
per cpu area" patch.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-01-16 14:19:46 +01:00
..
acpi Merge branch 'simplify_PRT' into release 2009-01-09 03:41:08 -05:00
asm-arm [ARM] S3C24XX: Move mci.h to arch/arm/plat-s3c24xx/include/plat 2008-10-30 10:17:16 +00:00
asm-frv NOMMU: Make VMAs per MM as for MMU-mode linux 2009-01-08 12:04:47 +00:00
asm-generic x86: fold pda into percpu area on SMP 2009-01-16 14:19:46 +01:00
asm-h8300
asm-m32r NOMMU: Make VMAs per MM as for MMU-mode linux 2009-01-08 12:04:47 +00:00
asm-m68k m68k: Wire up sys_restart_syscall 2009-01-12 20:56:43 +01:00
asm-mn10300 mn10300: introduce asm/swab.h 2009-01-06 18:10:29 -08:00
crypto crypto: aes - Precompute tables 2008-12-25 11:05:13 +11:00
drm drm: Add a debug node for vblank state. 2008-12-29 17:47:27 +10:00
keys KEYS: Disperse linux/key_ui.h 2008-11-14 10:39:13 +11:00
linux Merge branches 'cpus4096', 'x86/cleanups' and 'x86/urgent' into x86/percpu 2009-01-15 13:18:57 +01:00
math-emu
media V4L/DVB (10141): v4l2: debugging API changed to match against driver name instead of ID. 2009-01-02 17:11:52 -02:00
mtd trivial: fix then -> than typos in comments and documentation 2009-01-06 11:28:06 +01:00
net wimax: fix typo in kernel-doc for debugfs_dentry in struct wimax_dev 2009-01-11 00:06:32 -08:00
pcmcia
rdma
rxrpc
scsi [SCSI] fc transport: restore missing dev_loss_tmo callback to LLDD 2009-01-06 09:43:33 -06:00
sound Merge branch 'topic/asoc' into for-linus 2009-01-12 14:05:50 +01:00
trace sched, trace: update trace_sched_wakeup() 2008-12-25 13:10:21 +01:00
video video: sh_mobile_lcdcfb deferred io support 2008-12-22 18:44:48 +09:00
xen xen: add xenfs to allow usermode <-> Xen interaction 2009-01-08 08:30:59 -08:00
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