7c3576d261
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>
30 lines
762 B
C
30 lines
762 B
C
#include <linux/module.h>
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#include <asm/checksum.h>
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#include <asm/desc.h>
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EXPORT_SYMBOL(__down_failed);
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EXPORT_SYMBOL(__down_failed_interruptible);
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EXPORT_SYMBOL(__down_failed_trylock);
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EXPORT_SYMBOL(__up_wakeup);
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/* Networking helper routines. */
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EXPORT_SYMBOL(csum_partial_copy_generic);
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EXPORT_SYMBOL(__get_user_1);
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EXPORT_SYMBOL(__get_user_2);
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EXPORT_SYMBOL(__get_user_4);
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EXPORT_SYMBOL(__put_user_1);
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EXPORT_SYMBOL(__put_user_2);
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EXPORT_SYMBOL(__put_user_4);
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EXPORT_SYMBOL(__put_user_8);
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EXPORT_SYMBOL(strstr);
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#ifdef CONFIG_SMP
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extern void FASTCALL( __write_lock_failed(rwlock_t *rw));
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extern void FASTCALL( __read_lock_failed(rwlock_t *rw));
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EXPORT_SYMBOL(__write_lock_failed);
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EXPORT_SYMBOL(__read_lock_failed);
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#endif
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EXPORT_SYMBOL(csum_partial);
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