powerpc/book3e: drop BUG_ON() in map_kernel_page()

early_alloc_pgtable() never returns NULL as it panics on failure.

This patch drops the three BUG_ON() which check the non nullity
of early_alloc_pgtable() returned value.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/mm/pgtable-book3e.c b/arch/powerpc/mm/pgtable-book3e.c
index 1032ef7..390a6d0 100644 (file)
--- a/arch/powerpc/mm/pgtable-book3e.c
+++ b/arch/powerpc/mm/pgtable-book3e.c
@@ -98,20 +98,17 @@ int map_kernel_page(unsigned long ea, unsigned long pa, pgprot_t prot)
 #ifndef __PAGETABLE_PUD_FOLDED
                if (pgd_none(*pgdp)) {
                        pudp = early_alloc_pgtable(PUD_TABLE_SIZE);
-                       BUG_ON(pudp == NULL);
                        pgd_populate(&init_mm, pgdp, pudp);
                }
 #endif /* !__PAGETABLE_PUD_FOLDED */
                pudp = pud_offset(pgdp, ea);
                if (pud_none(*pudp)) {
                        pmdp = early_alloc_pgtable(PMD_TABLE_SIZE);
-                       BUG_ON(pmdp == NULL);
                        pud_populate(&init_mm, pudp, pmdp);
                }
                pmdp = pmd_offset(pudp, ea);
                if (!pmd_present(*pmdp)) {
                        ptep = early_alloc_pgtable(PAGE_SIZE);
-                       BUG_ON(ptep == NULL);
                        pmd_populate_kernel(&init_mm, pmdp, ptep);
                }
                ptep = pte_offset_kernel(pmdp, ea);