[PATCH 1/3] x86: Honour passed pgprot in track_pfn_insert() and track_pfn_remap()
From: Matthew Wilcox <hidden>
Date: 2016-01-25 17:25:38
Also in:
lkml
Subsystem:
the rest, x86 architecture (32-bit and 64-bit), x86 mm · Maintainers:
Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen, Andy Lutomirski, Peter Zijlstra
From: Matthew Wilcox <redacted> track_pfn_insert() overwrites the pgprot that is passed in with a value based on the VMA's page_prot. This is a problem for people trying to do clever things with the new vm_insert_pfn_prot() as it will simply overwrite the passed protection flags. If we use the current value of the pgprot as the base, then it will behave as people are expecting. Also fix track_pfn_remap() in the same way. Signed-off-by: Matthew Wilcox <redacted> --- arch/x86/mm/pat.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index f4ae536..04e2e71 100644
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c@@ -943,7 +943,7 @@ int track_pfn_remap(struct vm_area_struct *vma, pgprot_t *prot, return -EINVAL; } - *prot = __pgprot((pgprot_val(vma->vm_page_prot) & (~_PAGE_CACHE_MASK)) | + *prot = __pgprot((pgprot_val(*prot) & (~_PAGE_CACHE_MASK)) | cachemode2protval(pcm)); return 0;
@@ -959,7 +959,7 @@ int track_pfn_insert(struct vm_area_struct *vma, pgprot_t *prot, /* Set prot based on lookup */ pcm = lookup_memtype(pfn_t_to_phys(pfn)); - *prot = __pgprot((pgprot_val(vma->vm_page_prot) & (~_PAGE_CACHE_MASK)) | + *prot = __pgprot((pgprot_val(*prot) & (~_PAGE_CACHE_MASK)) | cachemode2protval(pcm)); return 0;
--
2.7.0.rc3
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