x86: modify get_desc_base

This patch makes get_desc_base() receive a struct desc_struct,
and then uses its internal fields to compute the base address.
This is done at both i386 and x86_64, and then it is moved
to common header

Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

3 files changed, 5 insertions, 17 deletions

diff --git a/include/asm-x86/desc.h b/include/asm-x86/desc.h
index 99c4adc851e2..a6fdd7c7b6b2 100644
--- a/include/asm-x86/desc.h
+++ b/include/asm-x86/desc.h
@@ -69,6 +69,11 @@ static inline void load_LDT(mm_context_t *pc)
         preempt_enable();
 }
 
+static inline unsigned long get_desc_base(struct desc_struct *desc)
+{
+        return desc->base0 | ((desc->base1) << 16) | ((desc->base2) << 24);
+}
+
 #else
 /*
  * GET_DESC_BASE reads the descriptor base of the specified segment.
diff --git a/include/asm-x86/desc_32.h b/include/asm-x86/desc_32.h
index 01415ad35fdf..8450c2a99c3a 100644
--- a/include/asm-x86/desc_32.h
+++ b/include/asm-x86/desc_32.h
@@ -168,14 +168,6 @@ static inline void __set_tss_desc(unsigned int cpu, unsigned int entry, const vo
 
 #define set_tss_desc(cpu,addr) __set_tss_desc(cpu, GDT_ENTRY_TSS, addr)
 
-static inline unsigned long get_desc_base(unsigned long *desc)
-{
-        unsigned long base;
-        base = ((desc[0] >> 16)  & 0x0000ffff) |
-                ((desc[1] << 16) & 0x00ff0000) |
-                (desc[1] & 0xff000000);
-        return base;
-}
 #endif /* !__ASSEMBLY__ */
 
 #endif
diff --git a/include/asm-x86/desc_64.h b/include/asm-x86/desc_64.h
index 448f96ed973f..a7a6c301c6bc 100644
--- a/include/asm-x86/desc_64.h
+++ b/include/asm-x86/desc_64.h
@@ -156,15 +156,6 @@ static inline void load_TLS(struct thread_struct *t, unsigned int cpu)
                 gdt[i] = t->tls_array[i];
 }
 
-static inline unsigned long get_desc_base(const void *ptr)
-{
-        const u32 *desc = ptr;
-        unsigned long base;
-        base = ((desc[0] >> 16)  & 0x0000ffff) |
-                ((desc[1] << 16) & 0x00ff0000) |
-                (desc[1] & 0xff000000);
-        return base;
-}
 #endif /* !__ASSEMBLY__ */
 
 #endif