diff options
author | Jeremy Fitzhardinge <jeremy@goop.org> | 2007-05-02 13:27:16 -0400 |
---|---|---|
committer | Andi Kleen <andi@basil.nowhere.org> | 2007-05-02 13:27:16 -0400 |
commit | 7c3576d261ce046789a7db14f43303f8120910c7 (patch) | |
tree | ad27a8459bbcdb183fe2411aec3b840942992ad5 /arch/i386/kernel/vmlinux.lds.S | |
parent | 7a61d35d4b4056e7711031202da7605e052f4137 (diff) |
[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/vmlinux.lds.S')
-rw-r--r-- | arch/i386/kernel/vmlinux.lds.S | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/i386/kernel/vmlinux.lds.S b/arch/i386/kernel/vmlinux.lds.S index 2ce4aa185fc8..d125784ddf5e 100644 --- a/arch/i386/kernel/vmlinux.lds.S +++ b/arch/i386/kernel/vmlinux.lds.S | |||
@@ -26,7 +26,6 @@ OUTPUT_FORMAT("elf32-i386", "elf32-i386", "elf32-i386") | |||
26 | OUTPUT_ARCH(i386) | 26 | OUTPUT_ARCH(i386) |
27 | ENTRY(phys_startup_32) | 27 | ENTRY(phys_startup_32) |
28 | jiffies = jiffies_64; | 28 | jiffies = jiffies_64; |
29 | _proxy_pda = 1; | ||
30 | 29 | ||
31 | PHDRS { | 30 | PHDRS { |
32 | text PT_LOAD FLAGS(5); /* R_E */ | 31 | text PT_LOAD FLAGS(5); /* R_E */ |