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authorJeremy Fitzhardinge <jeremy@goop.org>2007-05-02 19:27:16 +0200
committerAndi Kleen <andi@basil.nowhere.org>2007-05-02 19:27:16 +0200
commit7c3576d261ce046789a7db14f43303f8120910c7 (patch)
treead27a8459bbcdb183fe2411aec3b840942992ad5 /arch/i386/kernel/vmi.c
parent7a61d35d4b4056e7711031202da7605e052f4137 (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/vmi.c')
-rw-r--r--arch/i386/kernel/vmi.c6
1 files changed, 1 insertions, 5 deletions
diff --git a/arch/i386/kernel/vmi.c b/arch/i386/kernel/vmi.c
index ccad7ee960a..12312988c62 100644
--- a/arch/i386/kernel/vmi.c
+++ b/arch/i386/kernel/vmi.c
@@ -504,8 +504,6 @@ static void vmi_pmd_clear(pmd_t *pmd)
#endif
#ifdef CONFIG_SMP
-extern void setup_pda(void);
-
static void __devinit
vmi_startup_ipi_hook(int phys_apicid, unsigned long start_eip,
unsigned long start_esp)
@@ -530,13 +528,11 @@ vmi_startup_ipi_hook(int phys_apicid, unsigned long start_eip,
ap.ds = __USER_DS;
ap.es = __USER_DS;
- ap.fs = __KERNEL_PDA;
+ ap.fs = __KERNEL_PERCPU;
ap.gs = 0;
ap.eflags = 0;
- setup_pda();
-
#ifdef CONFIG_X86_PAE
/* efer should match BSP efer. */
if (cpu_has_nx) {