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| author | Jeremy Fitzhardinge | 2007-05-02 19:27:16 +0200 |
|---|---|---|
| committer | Andi Kleen | 2007-05-02 19:27:16 +0200 |
| commit | 7c3576d261ce046789a7db14f43303f8120910c7 (patch) | |
| tree | ad27a8459bbcdb183fe2411aec3b840942992ad5 /arch/i386/kernel/irq.c | |
| parent | [PATCH] i386: Page-align the GDT (diff) | |
| download | kernel-qcow2-linux-7c3576d261ce046789a7db14f43303f8120910c7.tar.gz kernel-qcow2-linux-7c3576d261ce046789a7db14f43303f8120910c7.tar.xz kernel-qcow2-linux-7c3576d261ce046789a7db14f43303f8120910c7.zip | |
[PATCH] i386: Convert PDA into the percpu section
Currently x86 (similar to x84-64) has a special per-cpu structure
called "i386_pda" which can be easily and efficiently referenced via
the %fs register. An ELF section is more flexible than a structure,
allowing any piece of code to use this area. Indeed, such a section
already exists: the per-cpu area.
So this patch:
(1) Removes the PDA and uses per-cpu variables for each current member.
(2) Replaces the __KERNEL_PDA segment with __KERNEL_PERCPU.
(3) Creates a per-cpu mirror of __per_cpu_offset called this_cpu_off, which
can be used to calculate addresses for this CPU's variables.
(4) Simplifies startup, because %fs doesn't need to be loaded with a
special segment at early boot; it can be deferred until the first
percpu area is allocated (or never for UP).
The result is less code and one less x86-specific concept.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Andi Kleen <ak@suse.de>
Diffstat (limited to 'arch/i386/kernel/irq.c')
| -rw-r--r-- | arch/i386/kernel/irq.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/i386/kernel/irq.c b/arch/i386/kernel/irq.c index 8db8d514c9c0..d2daf672f4a2 100644 --- a/arch/i386/kernel/irq.c +++ b/arch/i386/kernel/irq.c @@ -24,6 +24,9 @@ DEFINE_PER_CPU(irq_cpustat_t, irq_stat) ____cacheline_internodealigned_in_smp; EXPORT_PER_CPU_SYMBOL(irq_stat); +DEFINE_PER_CPU(struct pt_regs *, irq_regs); +EXPORT_PER_CPU_SYMBOL(irq_regs); + /* * 'what should we do if we get a hw irq event on an illegal vector'. * each architecture has to answer this themselves. |