Messages in this thread | | | Date | Thu, 9 May 2019 10:42:20 -0700 | From | Matthew Wilcox <> | Subject | Re: [PATCH] mm/huge_memory: Fix vmf_insert_pfn_{pmd, pud}() crash, handle unaligned addresses |
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On Thu, May 09, 2019 at 09:31:41AM -0700, Dan Williams wrote: > diff --git a/drivers/dax/device.c b/drivers/dax/device.c > index e428468ab661..996d68ff992a 100644 > --- a/drivers/dax/device.c > +++ b/drivers/dax/device.c > @@ -184,8 +184,7 @@ static vm_fault_t __dev_dax_pmd_fault(struct dev_dax *dev_dax, > + return vmf_insert_pfn_pmd(vmf, *pfn, vmf->flags & FAULT_FLAG_WRITE);
I think we can ditch the third parameter too. Going through the callers ...
> @@ -235,8 +234,7 @@ static vm_fault_t __dev_dax_pud_fault(struct dev_dax *dev_dax, > + return vmf_insert_pfn_pud(vmf, *pfn, vmf->flags & FAULT_FLAG_WRITE);
> @@ -1575,8 +1575,7 @@ static vm_fault_t dax_iomap_pmd_fault(struct vm_fault *vmf, pfn_t *pfnp, > + result = vmf_insert_pfn_pmd(vmf, pfn, write);
This 'write' parameter came earlier from:
bool write = vmf->flags & FAULT_FLAG_WRITE;
and it is not modified subsequently.
> @@ -1686,8 +1685,7 @@ dax_insert_pfn_mkwrite(struct vm_fault *vmf, pfn_t pfn, unsigned int order) > + ret = vmf_insert_pfn_pmd(vmf, pfn, FAULT_FLAG_WRITE);
If FAULT_FLAG_WRITE is not set in a mkwrite handler, I don't know what's gone wrong with the world.
Even without these changes,
Reviewed-by: Matthew Wilcox <willy@infradead.org>
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