LoongArch: Remove __GFP_HIGHMEM masking in pud_alloc_one()

Remove the unnecessary __GFP_HIGHMEM masking in pud_alloc_one(), which
was introduced with commit 3827397 ("loongarch: convert various
functions to use ptdescs"). GFP_KERNEL doesn't contain __GFP_HIGHMEM.

Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

Author: VMoola

arch/loongarch/include/asm/pgalloc.h

@@ -88,7 +88,7 @@ static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
 {
 	pud_t *pud;
-	struct ptdesc *ptdesc = pagetable_alloc(GFP_KERNEL & ~__GFP_HIGHMEM, 0);
+	struct ptdesc *ptdesc = pagetable_alloc(GFP_KERNEL, 0);
 
 	if (!ptdesc)
 		return NULL;