On Wednesday 17 September 2008 00:57, Michael Trimarchi wrote: > Hi, > > ----- Messaggio originale ----- > > > Da: Nick Piggin <nickpiggin@xxxxxxxxxxxx> > > A: Michael Trimarchi <trimarchimichael@xxxxxxxx> > > Cc: Hisashi Hifumi <hifumi.hisashi@xxxxxxxxxxxxx>; > akpm@xxxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; > linux-fsdevel@xxxxxxxxxxxxxxx > > > Inviato: Martedì 16 settembre 2008, 16:11:21 > > Oggetto: Re: [PATCH] VFS: make file->f_pos access atomic on 32bit arch > > ... > > > > i was thinking about introducing a file_pos_update() not implemented > > > using file_pos_read()/file_pos_write() and taking the seq_lock or > > > disabling preemption only one time > > > > AFAIK, the only way to do an atomic 64 bit store on 32-bit x86 is > > "cmpxchg8b" (with lock prefix on SMP). That would be far slower > > I'm sure. > > Maybe it is clear with an example: I understand and agree. -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
