> -----Original Message----- > From: Paolo Bonzini [mailto:pbonzini@xxxxxxxxxx] > Sent: Friday, 22 December 2017 18:02 > To: Adalber Lazăr <alazar@xxxxxxxxxxxxxxx>; kvm@xxxxxxxxxxxxxxx > Cc: linux-mm@xxxxxxxxx; Radim Krčmář <rkrcmar@xxxxxxxxxx>; Xiao > Guangrong <guangrong.xiao@xxxxxxxxxxxxxxx>; Mihai Donțu > <mdontu@xxxxxxxxxxxxxxx>; Nicusor CITU <ncitu@xxxxxxxxxxxxxxx>; > Mircea CIRJALIU-MELIU <mcirjaliu@xxxxxxxxxxxxxxx>; Marian Cristian > ROTARIU <mrotariu@xxxxxxxxxxxxxxx> > Subject: Re: [RFC PATCH v4 08/18] kvm: add the VM introspection subsystem > > On 18/12/2017 20:06, Adalber Lazăr wrote: > > + /* VMAs will be modified */ > > + down_write(&req_mm->mmap_sem); > > + down_write(&map_mm->mmap_sem); > > + > > Is there a locking rule when locking multiple mmap_sems at the same > time? As it's written, this can cause deadlocks. First req_mm, second map_mm. The other function uses the same nesting. > > Paolo > > ________________________ > This email was scanned by Bitdefender
