x86/mm: Move pgprot2cachemode out of line

This helper is only used by x86 low-level MM code.  Also remove the
entirely pointless __pte2cachemode_tbl export as that symbol can be
marked static now.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200408152745.1565832-3-hch@lst.de

arch/x86/include/asm/memtype.h

@@ -25,5 +25,6 @@ extern void memtype_free_io(resource_size_t start, resource_size_t end);
 extern bool pat_pfn_immune_to_uc_mtrr(unsigned long pfn);
 
 bool x86_has_pat_wp(void);
+enum page_cache_mode pgprot2cachemode(pgprot_t pgprot);
 
 #endif /* _ASM_X86_MEMTYPE_H */

arch/x86/include/asm/pgtable_types.h

@@ -468,7 +468,6 @@ static inline pteval_t pte_flags(pte_t pte)
 }
 
 extern uint16_t __cachemode2pte_tbl[_PAGE_CACHE_MODE_NUM];
-extern uint8_t __pte2cachemode_tbl[8];
 
 #define __pte2cm_idx(cb)				\
 	((((cb) >> (_PAGE_BIT_PAT - 2)) & 4) |		\
@@ -489,15 +488,6 @@ static inline pgprot_t cachemode2pgprot(enum page_cache_mode pcm)
 {
 	return __pgprot(cachemode2protval(pcm));
 }
-static inline enum page_cache_mode pgprot2cachemode(pgprot_t pgprot)
-{
-	unsigned long masked;
-
-	masked = pgprot_val(pgprot) & _PAGE_CACHE_MASK;
-	if (likely(masked == 0))
-		return 0;
-	return __pte2cachemode_tbl[__pte2cm_idx(masked)];
-}
 static inline pgprot_t pgprot_4k_2_large(pgprot_t pgprot)
 {
 	pgprotval_t val = pgprot_val(pgprot);

arch/x86/mm/init.c

@@ -59,7 +59,7 @@ uint16_t __cachemode2pte_tbl[_PAGE_CACHE_MODE_NUM] = {
 };
 EXPORT_SYMBOL(__cachemode2pte_tbl);
 
-uint8_t __pte2cachemode_tbl[8] = {
+static uint8_t __pte2cachemode_tbl[8] = {
 	[__pte2cm_idx( 0        | 0         | 0        )] = _PAGE_CACHE_MODE_WB,
 	[__pte2cm_idx(_PAGE_PWT | 0         | 0        )] = _PAGE_CACHE_MODE_UC_MINUS,
 	[__pte2cm_idx( 0        | _PAGE_PCD | 0        )] = _PAGE_CACHE_MODE_UC_MINUS,
@@ -69,7 +69,6 @@ uint8_t __pte2cachemode_tbl[8] = {
 	[__pte2cm_idx(0         | _PAGE_PCD | _PAGE_PAT)] = _PAGE_CACHE_MODE_UC_MINUS,
 	[__pte2cm_idx(_PAGE_PWT | _PAGE_PCD | _PAGE_PAT)] = _PAGE_CACHE_MODE_UC,
 };
-EXPORT_SYMBOL(__pte2cachemode_tbl);
 
 /* Check that the write-protect PAT entry is set for write-protect */
 bool x86_has_pat_wp(void)
@@ -77,6 +76,16 @@ bool x86_has_pat_wp(void)
 	return __pte2cachemode_tbl[_PAGE_CACHE_MODE_WP] == _PAGE_CACHE_MODE_WP;
 }
 
+enum page_cache_mode pgprot2cachemode(pgprot_t pgprot)
+{
+	unsigned long masked;
+
+	masked = pgprot_val(pgprot) & _PAGE_CACHE_MASK;
+	if (likely(masked == 0))
+		return 0;
+	return __pte2cachemode_tbl[__pte2cm_idx(masked)];
+}
+
 static unsigned long __initdata pgt_buf_start;
 static unsigned long __initdata pgt_buf_end;
 static unsigned long __initdata pgt_buf_top;