Messages in this thread Patch in this message | | | Date | Fri, 18 Aug 2006 12:01:25 +0100 | From | Jeremy Fitzhardinge <> | Subject | [PATCH] kill default_ldt |
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The default LDT is completely unused now that iBCS is no longer supported, so get rid of it.
Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
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diff -r 121e0e54cca8 arch/i386/kernel/ldt.c --- a/arch/i386/kernel/ldt.c Fri Aug 18 11:36:24 2006 +0100 +++ b/arch/i386/kernel/ldt.c Fri Aug 18 11:57:04 2006 +0100 @@ -160,16 +160,14 @@ static int read_default_ldt(void __user { int err; unsigned long size; - void *address; err = 0; - address = &default_ldt[0]; size = 5*sizeof(struct desc_struct); if (size > bytecount) size = bytecount; err = size; - if (copy_to_user(ptr, address, size)) + if (clear_user(ptr, size)) err = -EFAULT; return err; diff -r 121e0e54cca8 arch/i386/kernel/traps.c --- a/arch/i386/kernel/traps.c Fri Aug 18 11:36:24 2006 +0100 +++ b/arch/i386/kernel/traps.c Fri Aug 18 11:36:24 2006 +0100 @@ -58,9 +58,6 @@ #include "mach_traps.h" asmlinkage int system_call(void); - -struct desc_struct default_ldt[] = { { 0, 0 }, { 0, 0 }, { 0, 0 }, - { 0, 0 }, { 0, 0 } }; /* Do we ignore FPU interrupts ? */ char ignore_fpu_irq = 0; diff -r 121e0e54cca8 include/asm-i386/desc.h --- a/include/asm-i386/desc.h Fri Aug 18 11:36:24 2006 +0100 +++ b/include/asm-i386/desc.h Fri Aug 18 11:56:31 2006 +0100 @@ -33,11 +33,6 @@ static inline struct desc_struct *get_cp return (struct desc_struct *)per_cpu(cpu_gdt_descr, cpu).address; } -/* - * This is the ldt that every process will get unless we need - * something other than this. - */ -extern struct desc_struct default_ldt[]; extern struct desc_struct idt_table[]; extern void set_intr_gate(unsigned int irq, void * addr); @@ -159,7 +154,7 @@ static inline void clear_LDT(void) { int cpu = get_cpu(); - set_ldt_desc(cpu, &default_ldt[0], 5); + set_ldt_desc(cpu, NULL, 0); load_LDT_desc(); put_cpu(); } @@ -172,10 +167,8 @@ static inline void load_LDT_nolock(mm_co void *segments = pc->ldt; int count = pc->size; - if (likely(!count)) { - segments = &default_ldt[0]; - count = 5; - } + if (likely(!count)) + segments = NULL; set_ldt_desc(cpu, segments, count); load_LDT_desc(); - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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