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| author |   Christoph Hellwig <hch@lst.de> | 2020-04-08 17:27:43 +0200 |
|---|---|---|
| committer |   Borislav Petkov <bp@suse.de> | 2020-04-20 12:39:17 +0200 |
| commit | 7fa3e10f0f3646108a1018004d0f571c3222dc9f (patch) | |
| tree | 2b354bc252096a5d2f282d8d2eeddd8f0de2b089 /arch/x86/mm/init.c | |
| parent | x86/mm: Add a x86_has_pat_wp() helper (diff) | |
| download | linux-dev-7fa3e10f0f3646108a1018004d0f571c3222dc9f.tar.xz linux-dev-7fa3e10f0f3646108a1018004d0f571c3222dc9f.zip | |
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
Diffstat (limited to 'arch/x86/mm/init.c')
| -rw-r--r-- | arch/x86/mm/init.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c index 6005f83b8111..4a55d687c246 100644 --- a/arch/x86/mm/init.c +++ b/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; |