MIPS: stop using _PTRS_PER_PGD

gcc 3.3 has been retired for a while, use PTRS_PER_PGD and remove the
asm-offsets.h inclusion.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Paul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/20814/
Cc: James Hogan <jhogan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org

arch/mips/mm/init.c

@@ -32,7 +32,6 @@
 #include <linux/kcore.h>
 #include <linux/initrd.h>
 
-#include <asm/asm-offsets.h>
 #include <asm/bootinfo.h>
 #include <asm/cachectl.h>
 #include <asm/cpu.h>
@@ -521,17 +520,13 @@ unsigned long pgd_current[NR_CPUS];
 #endif
 
 /*
- * gcc 3.3 and older have trouble determining that PTRS_PER_PGD and PGD_ORDER
- * are constants.  So we use the variants from asm-offset.h until that gcc
- * will officially be retired.
- *
  * Align swapper_pg_dir in to 64K, allows its address to be loaded
  * with a single LUI instruction in the TLB handlers.  If we used
  * __aligned(64K), its size would get rounded up to the alignment
  * size, and waste space.  So we place it in its own section and align
  * it in the linker script.
  */
-pgd_t swapper_pg_dir[_PTRS_PER_PGD] __section(.bss..swapper_pg_dir);
+pgd_t swapper_pg_dir[PTRS_PER_PGD] __section(.bss..swapper_pg_dir);
 #ifndef __PAGETABLE_PUD_FOLDED
 pud_t invalid_pud_table[PTRS_PER_PUD] __page_aligned_bss;
 #endif