On Thursday 31 March 2005 11:26, Jeff Garzik wrote:
> Yum Rayan wrote:
> > Attempt to reduce stack usage in time.c (linux-2.6.12-rc1-mm3). Stack
> > usage was noted using checkstack.pl. Specifically:
> >
> > Before patch
> > ------------
> > sys_adjtimex - 128
> >
> > After patch
> > -----------
> > sys_adjtimex - none (register usage only)
> >
> > Signed-off-by: Yum Rayan <[email protected]>
> >
> > --- a/kernel/time.c 2005-03-25 22:11:06.000000000 -0800
> > +++ b/kernel/time.c 2005-03-30 16:59:51.000000000 -0800
> > @@ -413,17 +413,27 @@
> >
> > asmlinkage long sys_adjtimex(struct timex __user *txc_p)
> > {
> > - struct timex txc; /* Local copy of parameter */
> > - int ret;
> > + struct timex *txc; /* Local copy of parameter */
> > + int retval;
> > +
> > + txc = kmalloc(sizeof(struct timex), GFP_KERNEL);
> > + if (!txc)
> > + return -ENOMEM;
> >
> > /* Copy the user data space into the kernel copy
> > * structure. But bear in mind that the structures
> > * may change
> > */
> > - if(copy_from_user(&txc, txc_p, sizeof(struct timex)))
> > - return -EFAULT;
> > - ret = do_adjtimex(&txc);
> > - return copy_to_user(txc_p, &txc, sizeof(struct timex)) ? -EFAULT : ret;
> > + if(copy_from_user(txc, txc_p, sizeof(struct timex))) {
> > + retval = -EFAULT;
> > + goto free_txc;
> > + }
> > + retval = do_adjtimex(txc);
> > + if (copy_to_user(txc_p, txc, sizeof(struct timex)))
> > + retval = -EFAULT;
> > +free_txc:
Is this a syscall?
Is it ever called from some deeply nested kernel function?
--
vda
-
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