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| author | Christoph Hellwig <hch@lst.de> | 2020-04-08 17:27:42 +0200 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2020-04-20 12:39:11 +0200 |
| commit | 1f6f655e01adebf5bd5e6c3da2e843c104ded051 (patch) | |
| tree | 8c382295cdeffe4367294800b384bb99beea9e22 /arch/x86/mm/init.c | |
| parent | ae83d0b416db002fe95601e7f97f64b59514d936 (diff) | |
| download | linux-1f6f655e01adebf5bd5e6c3da2e843c104ded051.tar.gz | |
x86/mm: Add a x86_has_pat_wp() helper
Abstract the ioremap code away from the caching mode internals.
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/20200408152745.1565832-2-hch@lst.de
Diffstat (limited to 'arch/x86/mm/init.c')
| -rw-r--r-- | arch/x86/mm/init.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c index 1bba16c5742b..6005f83b8111 100644 --- a/arch/x86/mm/init.c +++ b/arch/x86/mm/init.c @@ -71,6 +71,12 @@ uint8_t __pte2cachemode_tbl[8] = { }; EXPORT_SYMBOL(__pte2cachemode_tbl); +/* Check that the write-protect PAT entry is set for write-protect */ +bool x86_has_pat_wp(void) +{ + return __pte2cachemode_tbl[_PAGE_CACHE_MODE_WP] == _PAGE_CACHE_MODE_WP; +} + static unsigned long __initdata pgt_buf_start; static unsigned long __initdata pgt_buf_end; static unsigned long __initdata pgt_buf_top; |