mm/debug_vm_pgtable: remove unused code

The variables used by old implementation isn't needed as we switched to
"struct pgtable_debug_args".  Lets remove them and related code in
debug_vm_pgtable().

Link: https://lkml.kernel.org/r/20210809092631.1888748-12-gshan@redhat.com
Signed-off-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Tested-by: Christophe Leroy <christophe.leroy@csgroup.eu>	[powerpc 8xx]
Tested-by: Gerald Schaefer <gerald.schaefer@linux.ibm.com>	[s390]
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Chunyu Hu <chuhu@redhat.com>
Cc: Qian Cai <cai@lca.pw>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c
index 9e932ae..4409e30 100644 (file)
--- a/mm/debug_vm_pgtable.c
+++ b/mm/debug_vm_pgtable.c
@@ -1189,14 +1189,6 @@ error:
 static int __init debug_vm_pgtable(void)
 {
        struct pgtable_debug_args args;
-       struct vm_area_struct *vma;
-       struct mm_struct *mm;
-       pgd_t *pgdp;
-       p4d_t *p4dp;
-       pud_t *pudp;
-       pmd_t *pmdp, *saved_pmdp, pmd;
-       pgtable_t saved_ptep;
-       unsigned long vaddr;
        spinlock_t *ptl = NULL;
        int idx, ret;
 
@@ -1205,41 +1197,6 @@ static int __init debug_vm_pgtable(void)
        if (ret)
                return ret;
 
-       vaddr = get_random_vaddr();
-       mm = mm_alloc();
-       if (!mm) {
-               pr_err("mm_struct allocation failed\n");
-               return 1;
-       }
-
-       vma = vm_area_alloc(mm);
-       if (!vma) {
-               pr_err("vma allocation failed\n");
-               return 1;
-       }
-
-       pgdp = pgd_offset(mm, vaddr);
-       p4dp = p4d_alloc(mm, pgdp, vaddr);
-       pudp = pud_alloc(mm, p4dp, vaddr);
-       pmdp = pmd_alloc(mm, pudp, vaddr);
-       /*
-        * Allocate pgtable_t
-        */
-       if (pte_alloc(mm, pmdp)) {
-               pr_err("pgtable allocation failed\n");
-               return 1;
-       }
-
-       /*
-        * Save all the page table page addresses as the page table
-        * entries will be used for testing with random or garbage
-        * values. These saved addresses will be used for freeing
-        * page table pages.
-        */
-       pmd = READ_ONCE(*pmdp);
-       saved_pmdp = pmd_offset(pudp, 0UL);
-       saved_ptep = pmd_pgtable(pmd);
-
        /*
         * Iterate over the protection_map[] to make sure that all
         * the basic page table transformation validations just hold
@@ -1322,17 +1279,6 @@ static int __init debug_vm_pgtable(void)
        pgd_populate_tests(&args);
        spin_unlock(&(args.mm->page_table_lock));
 
-       p4d_free(mm, p4d_offset(pgdp, 0UL));
-       pud_free(mm, pud_offset(p4dp, 0UL));
-       pmd_free(mm, saved_pmdp);
-       pte_free(mm, saved_ptep);
-
-       vm_area_free(vma);
-       mm_dec_nr_puds(mm);
-       mm_dec_nr_pmds(mm);
-       mm_dec_nr_ptes(mm);
-       mmdrop(mm);
-
        destroy_args(&args);
        return 0;
 }