improve comments a bit. ok mlarkin tom

diff --git a/sys/arch/amd64/amd64/mem.c b/sys/arch/amd64/amd64/mem.c
index 4f22d1f..b412c1e 100644 (file)
--- a/sys/arch/amd64/amd64/mem.c
+++ b/sys/arch/amd64/amd64/mem.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: mem.c,v 1.28 2015/09/08 04:28:34 semarie Exp $ */
+/*     $OpenBSD: mem.c,v 1.29 2016/07/27 21:13:39 tedu Exp $ */
 /*
  * Copyright (c) 1988 University of Utah.
  * Copyright (c) 1982, 1986, 1990, 1993
@@ -78,7 +78,6 @@ int mem_range_attr_set(struct mem_range_desc *, int *);
 #endif
 
 
-/*ARGSUSED*/
 int
 mmopen(dev_t dev, int flag, int mode, struct proc *p)
 {
@@ -106,7 +105,6 @@ mmopen(dev_t dev, int flag, int mode, struct proc *p)
        return (0);
 }
 
-/*ARGSUSED*/
 int
 mmclose(dev_t dev, int flag, int mode, struct proc *p)
 {
@@ -117,7 +115,6 @@ mmclose(dev_t dev, int flag, int mode, struct proc *p)
        return (0);
 }
 
-/*ARGSUSED*/
 int
 mmrw(dev_t dev, struct uio *uio, int flags)
 {
@@ -138,13 +135,13 @@ mmrw(dev_t dev, struct uio *uio, int flags)
                }
                switch (minor(dev)) {
 
-/* minor device 0 is physical memory */
+               /* minor device 0 is physical memory */
                case 0:
                        v = PMAP_DIRECT_MAP(uio->uio_offset);
                        error = uiomove((caddr_t)v, uio->uio_resid, uio);
                        continue;
 
-/* minor device 1 is kernel memory */
+               /* minor device 1 is kernel memory */
                case 1:
                        v = uio->uio_offset;
                        c = ulmin(iov->iov_len, MAXPHYS);
@@ -159,20 +156,20 @@ mmrw(dev_t dev, struct uio *uio, int flags)
                        error = uiomove((caddr_t)v, c, uio);
                        continue;
 
-/* minor device 2 is EOF/RATHOLE */
+               /* minor device 2 is /dev/null */
                case 2:
                        if (uio->uio_rw == UIO_WRITE)
                                uio->uio_resid = 0;
                        return (0);
 
-/* minor device 12 (/dev/zero) is source of nulls on read, rathole on write */
+               /* minor device 12 is /dev/zero */
                case 12:
                        if (uio->uio_rw == UIO_WRITE) {
                                c = iov->iov_len;
                                break;
                        }
                        if (zeropage == NULL)
-                               zeropage = (caddr_t)
+                               zeropage =
                                    malloc(PAGE_SIZE, M_TEMP, M_WAITOK|M_ZERO);
                        c = ulmin(iov->iov_len, PAGE_SIZE);
                        error = uiomove(zeropage, c, uio);
@@ -196,14 +193,14 @@ mmmmap(dev_t dev, off_t off, int prot)
        struct proc *p = curproc;       /* XXX */
 
        switch (minor(dev)) {
-/* minor device 0 is physical memory */
+       /* minor device 0 is physical memory */
        case 0:
                if (suser(p, 0) != 0 && amd64_pa_used(off))
                        return -1;
                return off;
 
 #ifdef APERTURE
-/* minor device 4 is aperture driver */
+       /* minor device 4 is aperture driver */
        case 4:
                /* Check if a write combining mapping is requested. */
                if (off >= MEMRANGE_WC_RANGE)
@@ -332,6 +329,4 @@ mem_range_attr_set(struct mem_range_desc *mrd, int *arg)
 
        return (mem_range_softc.mr_op->set(&mem_range_softc, mrd, arg));
 }
-
 #endif /* MTRR */
-