From: Mukesh Rathor Date: Fri, 13 Dec 2013 17:09:28 +0000 (-0500) Subject: xen/p2m: Check for auto-xlat when doing mfn_to_local_pfn. X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=fc590efe667338f7da250cf2d2eb6fdd486e1b97;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git xen/p2m: Check for auto-xlat when doing mfn_to_local_pfn. Most of the functions in page.h are prefaced with if (xen_feature(XENFEAT_auto_translated_physmap)) return mfn; Except the mfn_to_local_pfn. At a first sight, the function should work without this patch - as the 'mfn_to_mfn' has a similar check. But there are no such check in the 'get_phys_to_machine' function - so we would crash in there. This fixes it by following the convention of having the check for auto-xlat in these static functions. Signed-off-by: Mukesh Rathor Signed-off-by: Konrad Rzeszutek Wilk Acked-by: Stefano Stabellini --- diff --git a/arch/x86/include/asm/xen/page.h b/arch/x86/include/asm/xen/page.h index b913915e8e63..4a092ccdd147 100644 --- a/arch/x86/include/asm/xen/page.h +++ b/arch/x86/include/asm/xen/page.h @@ -167,7 +167,12 @@ static inline xpaddr_t machine_to_phys(xmaddr_t machine) */ static inline unsigned long mfn_to_local_pfn(unsigned long mfn) { - unsigned long pfn = mfn_to_pfn(mfn); + unsigned long pfn; + + if (xen_feature(XENFEAT_auto_translated_physmap)) + return mfn; + + pfn = mfn_to_pfn(mfn); if (get_phys_to_machine(pfn) != mfn) return -1; /* force !pfn_valid() */ return pfn;