Hi, All, Please ignore this stupid email thread. I thought I had suppressed cc in gitconfig. But I am wrong... Very very sorry! Thanks Alex On 2018/11/28 7:29 PM, Alex Shi wrote: > From: Dexuan Cui <decui@xxxxxxxxxxxxx> > > commit d1cd1210834649ce1ca6bafe5ac25d2f40331343 upstream. > > pte_pfn() returns a PFN of long (32 bits in 32-PAE), so "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). > > Cast pte_pfn() to phys_addr_t before shifting. > > Fixes: "commit d76565344512: x86, mm: Create slow_virt_to_phys()" > Signed-off-by: Dexuan Cui <decui@xxxxxxxxxxxxx> > Cc: K. Y. Srinivasan <kys@xxxxxxxxxxxxx> > Cc: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx> > Cc: gregkh@xxxxxxxxxxxxxxxxxxx > Cc: linux-mm@xxxxxxxxx > Cc: olaf@xxxxxxxxx > Cc: apw@xxxxxxxxxxxxx > Cc: jasowang@xxxxxxxxxx > Cc: dave.hansen@xxxxxxxxx > Cc: riel@xxxxxxxxxx > Cc: stable@xxxxxxxxxxxxxxx > Link: http://lkml.kernel.org/r/1414580017-27444-1-git-send-email-decui@xxxxxxxxxxxxx > Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> > Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> > Signed-off-by: Alex Shi <alex.shi@xxxxxxxxxxxxxxxxx> > --- > 7u/arch/x86/mm/pageattr.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/7u/arch/x86/mm/pageattr.c b/7u/arch/x86/mm/pageattr.c > index 4ed2b2d..81b82f4 100644 > --- a/7u/arch/x86/mm/pageattr.c > +++ b/7u/arch/x86/mm/pageattr.c > @@ -405,7 +405,7 @@ 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);
