From 1f6f655e01adebf5bd5e6c3da2e843c104ded051 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Wed, 8 Apr 2020 17:27:42 +0200 Subject: x86/mm: Add a x86_has_pat_wp() helper Abstract the ioremap code away from the caching mode internals. Signed-off-by: Christoph Hellwig Signed-off-by: Borislav Petkov Acked-by: Peter Zijlstra (Intel) Link: https://lkml.kernel.org/r/20200408152745.1565832-2-hch@lst.de --- arch/x86/mm/init.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'arch/x86/mm/init.c') 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; -- cgit v1.2.3