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Subject[rfc 39/45] x86_64: Remove the data_offset field from the pda.
It is useless now since gs can always stand in for data_offset.

Move active_mm into the available slot in order to not upset the
established offsets.

Signed-off-by: Christoph Lameter <clameter@sgi.com>

---
arch/x86/kernel/asm-offsets_64.c | 1 -
arch/x86/kernel/entry_64.S | 7 ++-----
arch/x86/kernel/setup64.c | 2 --
include/asm-x86/pda.h | 4 +---
4 files changed, 3 insertions(+), 11 deletions(-)

Index: linux-2.6/arch/x86/kernel/asm-offsets_64.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/asm-offsets_64.c 2007-11-19 15:45:03.902390058 -0800
+++ linux-2.6/arch/x86/kernel/asm-offsets_64.c 2007-11-19 16:13:29.241640104 -0800
@@ -56,7 +56,6 @@ int main(void)
ENTRY(irqcount);
ENTRY(cpunumber);
ENTRY(irqstackptr);
- ENTRY(data_offset);
BLANK();
#undef ENTRY
#ifdef CONFIG_IA32_EMULATION
Index: linux-2.6/arch/x86/kernel/entry_64.S
===================================================================
--- linux-2.6.orig/arch/x86/kernel/entry_64.S 2007-11-19 15:45:03.910390570 -0800
+++ linux-2.6/arch/x86/kernel/entry_64.S 2007-11-19 16:13:29.241640104 -0800
@@ -734,18 +734,15 @@ END(spurious_interrupt)
swapgs
xorl %ebx,%ebx
1:
- .if \ist
- movq %gs:pda_data_offset, %rbp
- .endif
movq %rsp,%rdi
movq ORIG_RAX(%rsp),%rsi
movq $-1,ORIG_RAX(%rsp)
.if \ist
- subq $EXCEPTION_STKSZ, per_cpu__init_tss + TSS_ist + (\ist - 1) * 8(%rbp)
+ subq $EXCEPTION_STKSZ, %gs: per_cpu__init_tss + TSS_ist
.endif
call \sym
.if \ist
- addq $EXCEPTION_STKSZ, per_cpu__init_tss + TSS_ist + (\ist - 1) * 8(%rbp)
+ addq $EXCEPTION_STKSZ, %gs: per_cpu__init_tss + TSS_ist
.endif
cli
.if \irqtrace
Index: linux-2.6/arch/x86/kernel/setup64.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/setup64.c 2007-11-19 16:06:50.162390389 -0800
+++ linux-2.6/arch/x86/kernel/setup64.c 2007-11-19 16:13:29.245640006 -0800
@@ -103,8 +103,6 @@ void __init setup_per_cpu_areas(void)
printk(KERN_INFO "PERCPU: Allocating %lu bytes of per cpu data\n",
PERCPU_ENOUGH_ROOM);
for_each_cpu_mask (i, cpu_possible_map) {
- cpu_pda(i)->data_offset = cpu_offset(i);
-
memcpy(CPU_PTR(base, i), __load_per_cpu_start,
__per_cpu_end - __per_cpu_start);

Index: linux-2.6/include/asm-x86/pda.h
===================================================================
--- linux-2.6.orig/include/asm-x86/pda.h 2007-11-19 16:06:15.301390091 -0800
+++ linux-2.6/include/asm-x86/pda.h 2007-11-19 16:13:29.245640006 -0800
@@ -10,8 +10,7 @@
/* Per processor datastructure. %gs points to it while the kernel runs */
struct x8664_pda {
struct task_struct *pcurrent; /* 0 Current process */
- unsigned long data_offset; /* 8 Per cpu data offset from linker
- address */
+ struct mm_struct *active_mm;
unsigned long kernelstack; /* 16 top of kernel stack for current */
unsigned long oldrsp; /* 24 user rsp for system call */
int irqcount; /* 32 Irq nesting counter. Starts with -1 */
@@ -27,7 +26,6 @@ struct x8664_pda {
unsigned int __nmi_count; /* number of NMI on this CPUs */
short mmu_state;
short isidle;
- struct mm_struct *active_mm;
unsigned apic_timer_irqs;
unsigned irq0_irqs;
unsigned irq_resched_count;
--
-
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