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[ 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 <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
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to cpumask.h
Impact: cleanup
Signed-off-by: Jaswinder Singh Rajput <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
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Impact: cleanup
Signed-off-by: Jaswinder Singh Rajput <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
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Impact: cleanup
Signed-off-by: Jaswinder Singh Rajput <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
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Impact: cleanup
Signed-off-by: Jaswinder Singh Rajput <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
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Impact: cleanup
Signed-off-by: Jaswinder Singh Rajput <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
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Impact: cleanup
Signed-off-by: Jaswinder Singh Rajput <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
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Impact: cleanup
Signed-off-by: Jaswinder Singh Rajput <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
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Impact: cleanup
Signed-off-by: Jaswinder Singh Rajput <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
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Impact: cleanup, moving NON-SMP stuff from smp.h
Signed-off-by: Jaswinder Singh Rajput <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
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Impact: cleanup, moving NON-SMP stuff from smp.h
Signed-off-by: Jaswinder Singh Rajput <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
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Impact: cleanup
Signed-off-by: Jaswinder Singh Rajput <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
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Impact: use new cpumask API to reduce memory and stack usage
Allocate the following local cpumasks based on the number of cpus that
are present. References will use new cpumask API. (Currently only
modified for x86_64, x86_32 continues to use the *_map variants.)
cpu_callin_mask
cpu_callout_mask
cpu_initialized_mask
cpu_sibling_setup_mask
Provide the following accessor functions:
struct cpumask *cpu_sibling_mask(int cpu)
struct cpumask *cpu_core_mask(int cpu)
Other changes are when setting or clearing the cpu online, possible
or present maps, use the accessor functions.
Signed-off-by: Mike Travis <[email protected]>
Acked-by: Rusty Russell <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
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This patch simply changes cpumask_t to struct cpumask and similar
trivial modernizations.
Signed-off-by: Rusty Russell <[email protected]>
Signed-off-by: Mike Travis <[email protected]>
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Impact: cleanup, change parameter passing
* Change genapic interfaces to accept cpumask_t pointers where possible.
* Modify external callers to use cpumask_t pointers in function calls.
* Create new send_IPI_mask_allbutself which is the same as the
send_IPI_mask functions but removes smp_processor_id() from list.
This removes another common need for a temporary cpumask_t variable.
* Functions that used a temp cpumask_t variable for:
cpumask_t allbutme = cpu_online_map;
cpu_clear(smp_processor_id(), allbutme);
if (!cpus_empty(allbutme))
...
become:
if (!cpus_equal(cpu_online_map, cpumask_of_cpu(cpu)))
...
* Other minor code optimizations (like using cpus_clear instead of
CPU_MASK_NONE, etc.)
Applies to linux-2.6.tip/master.
Signed-off-by: Mike Travis <[email protected]>
Signed-off-by: Rusty Russell <[email protected]>
Acked-by: Ingo Molnar <[email protected]>
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dc1e35c6e95e8923cf1d3510438b63c600fee1e2
Impact: build fix on x86/Voyager
Given commits like this:
| Author: Suresh Siddha <[email protected]>
| Date: Tue Jul 29 10:29:19 2008 -0700
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| x86, xsave: enable xsave/xrstor on cpus with xsave support
Which deliberately expose boot cpu dependence to pieces of the system,
I think it's time to explicitly have a variable for it to prevent this
continual misassumption that the boot CPU is zero.
Signed-off-by: James Bottomley <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
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Change header guards named "ASM_X86__*" to "_ASM_X86_*" since:
a. the double underscore is ugly and pointless.
b. no leading underscore violates namespace constraints.
Signed-off-by: H. Peter Anvin <[email protected]>
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Signed-off-by: Al Viro <[email protected]>
Signed-off-by: H. Peter Anvin <[email protected]>
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