arm64/mm: Refactor {pgd, pud, pmd, pte}_ERROR()

The function __{pgd, pud, pmd, pte}_error() are introduced so that
they can be called by {pgd, pud, pmd, pte}_ERROR(). However, some
of the functions could never be called when the corresponding page
table level isn't enabled. For example, __{pud, pmd}_error() are
unused when PUD and PMD are folded to PGD.

This removes __{pgd, pud, pmd, pte}_error() and call pr_err() from
{pgd, pud, pmd, pte}_ERROR() directly, similar to what x86/powerpc
are doing. With this, the code looks a bit simplified either.

Signed-off-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Link: https://lore.kernel.org/r/20200913234730.23145-1-gshan@redhat.com
Signed-off-by: Will Deacon <will@kernel.org>

Author: Gavin Shan

arch/arm64/include/asm/pgtable.h

@@ -35,11 +35,6 @@
 
 extern struct page *vmemmap;
 
-extern void __pte_error(const char *file, int line, unsigned long val);
-extern void __pmd_error(const char *file, int line, unsigned long val);
-extern void __pud_error(const char *file, int line, unsigned long val);
-extern void __pgd_error(const char *file, int line, unsigned long val);
-
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 #define __HAVE_ARCH_FLUSH_PMD_TLB_RANGE
 
@@ -57,7 +52,8 @@ extern void __pgd_error(const char *file, int line, unsigned long val);
 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
 #define ZERO_PAGE(vaddr)	phys_to_page(__pa_symbol(empty_zero_page))
 
-#define pte_ERROR(pte)		__pte_error(__FILE__, __LINE__, pte_val(pte))
+#define pte_ERROR(e)	\
+	pr_err("%s:%d: bad pte %016llx.\n", __FILE__, __LINE__, pte_val(e))
 
 /*
  * Macros to convert between a physical address and its placement in a
@@ -541,7 +537,8 @@ static inline unsigned long pmd_page_vaddr(pmd_t pmd)
 
 #if CONFIG_PGTABLE_LEVELS > 2
 
-#define pmd_ERROR(pmd)		__pmd_error(__FILE__, __LINE__, pmd_val(pmd))
+#define pmd_ERROR(e)	\
+	pr_err("%s:%d: bad pmd %016llx.\n", __FILE__, __LINE__, pmd_val(e))
 
 #define pud_none(pud)		(!pud_val(pud))
 #define pud_bad(pud)		(!(pud_val(pud) & PUD_TABLE_BIT))
@@ -608,7 +605,8 @@ static inline unsigned long pud_page_vaddr(pud_t pud)
 
 #if CONFIG_PGTABLE_LEVELS > 3
 
-#define pud_ERROR(pud)		__pud_error(__FILE__, __LINE__, pud_val(pud))
+#define pud_ERROR(e)	\
+	pr_err("%s:%d: bad pud %016llx.\n", __FILE__, __LINE__, pud_val(e))
 
 #define p4d_none(p4d)		(!p4d_val(p4d))
 #define p4d_bad(p4d)		(!(p4d_val(p4d) & 2))
@@ -667,7 +665,8 @@ static inline unsigned long p4d_page_vaddr(p4d_t p4d)
 
 #endif  /* CONFIG_PGTABLE_LEVELS > 3 */
 
-#define pgd_ERROR(pgd)		__pgd_error(__FILE__, __LINE__, pgd_val(pgd))
+#define pgd_ERROR(e)	\
+	pr_err("%s:%d: bad pgd %016llx.\n", __FILE__, __LINE__, pgd_val(e))
 
 #define pgd_set_fixmap(addr)	((pgd_t *)set_fixmap_offset(FIX_PGD, addr))
 #define pgd_clear_fixmap()	clear_fixmap(FIX_PGD)

arch/arm64/kernel/traps.c

@@ -935,26 +935,6 @@ asmlinkage void enter_from_user_mode(void)
 }
 NOKPROBE_SYMBOL(enter_from_user_mode);
 
-void __pte_error(const char *file, int line, unsigned long val)
-{
-	pr_err("%s:%d: bad pte %016lx.\n", file, line, val);
-}
-
-void __pmd_error(const char *file, int line, unsigned long val)
-{
-	pr_err("%s:%d: bad pmd %016lx.\n", file, line, val);
-}
-
-void __pud_error(const char *file, int line, unsigned long val)
-{
-	pr_err("%s:%d: bad pud %016lx.\n", file, line, val);
-}
-
-void __pgd_error(const char *file, int line, unsigned long val)
-{
-	pr_err("%s:%d: bad pgd %016lx.\n", file, line, val);
-}
-
 /* GENERIC_BUG traps */
 
 int is_valid_bugaddr(unsigned long addr)