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x86/mm: Move pgprot2cachemode out of line

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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
This commit is contained in:
Christoph Hellwig
2020-04-08 17:27:43 +02:00
committed by Borislav Petkov
parent 1f6f655e01
commit 7fa3e10f0f
3 changed files with 12 additions and 12 deletions
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13
arch/x86/mm/init.c
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@@ -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;