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Date: Wed, 29 Oct 2014 03:53:53 -0700 From: Dexuan Cui <decui@...rosoft.com> To: gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org, x86@...nel.org, olaf@...fle.de, apw@...onical.com, jasowang@...hat.com, tglx@...utronix.de, mingo@...hat.com, hpa@...or.com, dave.hansen@...el.com, riel@...hat.com Cc: kys@...rosoft.com, haiyangz@...rosoft.com Subject: [PATCH] x86, pageattr: fix slow_virt_to_phys() for X86_PAE pte_pfn() returns a PFN of long (32 bits in 32-PAE), then "long << PAGE_SHIFT" will overflow for PFNs above 4GB. Due to this issue, some Linux 32-PAE distros, running as guests on Hyper-V, with 5GB memory assigned, can't load the netvsc driver successfully and hence the synthetic network device can't work (we can use the kernel parameter mem=3000M to work around the issue). Cc: K. Y. Srinivasan <kys@...rosoft.com> Cc: Haiyang Zhang <haiyangz@...rosoft.com> Signed-off-by: Dexuan Cui <decui@...rosoft.com> --- arch/x86/mm/pageattr.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c index ae242a7..36de293 100644 --- a/arch/x86/mm/pageattr.c +++ b/arch/x86/mm/pageattr.c @@ -409,7 +409,7 @@ phys_addr_t slow_virt_to_phys(void *__virt_addr) psize = page_level_size(level); pmask = page_level_mask(level); offset = virt_addr & ~pmask; - phys_addr = pte_pfn(*pte) << PAGE_SHIFT; + phys_addr = (phys_addr_t)pte_pfn(*pte) << PAGE_SHIFT; return (phys_addr | offset); } EXPORT_SYMBOL_GPL(slow_virt_to_phys); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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