We currently have CPU 0's GDT at the top of the GDT range and
higher-numbered CPUs at lower addreses. This happens because the
fixmap is upside down (index 0 is the top of the fixmap).
Flip it so that GDTs are in ascending order by virtual address.
This will simplify a future patch that will generalize the GDT
remap to contain multiple pages.
Signed-off-by: Andy Lutomirski <l...@kernel.org>
---
arch/x86/include/asm/desc.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/desc.h b/arch/x86/include/asm/desc.h
index 9d0e13738ed3..02a414cda30f 100644
--- a/arch/x86/include/asm/desc.h
+++ b/arch/x86/include/asm/desc.h
@@ -62,7 +62,7 @@ static inline struct desc_struct *get_current_gdt_rw(void)
/* Get the fixmap index for a specific processor */
static inline unsigned int get_cpu_gdt_ro_index(int cpu)
{
- return FIX_GDT_REMAP_BEGIN + cpu;
+ return FIX_GDT_REMAP_END - cpu;
}
/* Provide the fixmap address of the remapped GDT */
--
2.13.6
