[src/trunk]: src/sys/dev/fdt Get rid of unnecessary calls to kmem_alloc

[jmcneill <jmcneill%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/3f7720f9376f
branches:  trunk
changeset: 833866:3f7720f9376f
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Sun Jul 15 16:59:16 2018 +0000

description:
Get rid of unnecessary calls to kmem_alloc

diffstat:

 sys/dev/fdt/fdt_intr.c |  33 ++++++++++++++-------------------
 1 files changed, 14 insertions(+), 19 deletions(-)

diffs (121 lines):

diff -r 23dd9fb26410 -r 3f7720f9376f sys/dev/fdt/fdt_intr.c
--- a/sys/dev/fdt/fdt_intr.c    Sun Jul 15 16:37:04 2018 +0000
+++ b/sys/dev/fdt/fdt_intr.c    Sun Jul 15 16:59:16 2018 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: fdt_intr.c,v 1.16 2018/07/15 13:24:05 jmcneill Exp $ */
+/* $NetBSD: fdt_intr.c,v 1.17 2018/07/15 16:59:16 jmcneill Exp $ */
 
 /*-
  * Copyright (c) 2015-2018 Jared McNeill <jmcneill%invisible.ca@localhost>
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: fdt_intr.c,v 1.16 2018/07/15 13:24:05 jmcneill Exp $");
+__KERNEL_RCSID(0, "$NetBSD: fdt_intr.c,v 1.17 2018/07/15 16:59:16 jmcneill Exp $");
 
 #include <sys/param.h>
 #include <sys/bus.h>
@@ -58,8 +58,8 @@
 static LIST_HEAD(, fdtbus_interrupt_cookie) fdtbus_interrupt_cookies =
     LIST_HEAD_INITIALIZER(fdtbus_interrupt_cookies);
 
-static u_int * get_specifier_by_index(int, int, int *);
-static u_int * get_specifier_from_map(int, const u_int *, int *);
+static const u_int *   get_specifier_by_index(int, int, int *);
+static const u_int *   get_specifier_from_map(int, const u_int *, int *);
 
 /*
  * Find the interrupt controller for a given node. This function will either
@@ -136,7 +136,7 @@
 {
        struct fdtbus_interrupt_controller *ic;
        struct fdtbus_interrupt_cookie *c = NULL;
-       u_int *specifier;
+       const u_int *specifier;
        int ihandle;
        void *ih;
 
@@ -148,7 +148,7 @@
        if (ic == NULL)
                return NULL;
 
-       ih = ic->ic_funcs->establish(ic->ic_dev, specifier,
+       ih = ic->ic_funcs->establish(ic->ic_dev, __UNCONST(specifier),
            ipl, flags, func, arg);
        if (ih != NULL) {
                c = kmem_alloc(sizeof(*c), KM_SLEEP);
@@ -185,7 +185,7 @@
 fdtbus_intr_str(int phandle, u_int index, char *buf, size_t buflen)
 {
        struct fdtbus_interrupt_controller *ic;
-       u_int *specifier;
+       const u_int *specifier;
        int ihandle;
 
        specifier = get_specifier_by_index(phandle, index, &ihandle);
@@ -194,7 +194,7 @@
        if (ic == NULL)
                return false;
 
-       return ic->ic_funcs->intrstr(ic->ic_dev, specifier, buf, buflen);
+       return ic->ic_funcs->intrstr(ic->ic_dev, __UNCONST(specifier), buf, buflen);
 }
 
 static int
@@ -221,10 +221,10 @@
        return 0;
 }
 
-static u_int *
+static const u_int *
 get_specifier_from_map(int phandle, const u_int *interrupt_spec, int *piphandle)
 {
-       u_int *result = NULL;
+       const u_int *result = NULL;
        int len, resid;
 
        const u_int *data = fdtbus_get_prop(phandle, "interrupt-map", &len);
@@ -267,15 +267,14 @@
 #endif
 
                if (memcmp(&p[cis_off], interrupt_spec, cis_cells * 4) == 0) {
+#ifdef FDT_INTR_DEBUG
                        const int slen = pus_cells + pis_cells;
-#ifdef FDT_INTR_DEBUG
                        printf(" intr map match iparent %08x slen %d:", iparent, slen);
                        for (int i = 0; i < slen; i++)
                                printf(" %08x", p[pus_off + i]);
                        printf("\n");
 #endif
-                       result = kmem_alloc(slen, KM_SLEEP);
-                       memcpy(result, &p[pus_off], slen * 4);
+                       result = &p[pus_off];
                        *piphandle = iparent;
                        goto done;
                }
@@ -291,11 +290,10 @@
        return result;
 }
 
-static u_int *
+static const u_int *
 get_specifier_by_index(int phandle, int pindex, int *piphandle)
 {
        const u_int *node_specifier;
-       u_int *specifier;
        int interrupt_parent, interrupt_cells, len;
 
        interrupt_parent = fdtbus_get_interrupt_parent(phandle);
@@ -320,10 +318,7 @@
        if (of_hasprop(interrupt_parent, "interrupt-map"))
                return get_specifier_from_map(interrupt_parent, node_specifier, piphandle);
 
-       specifier = kmem_alloc(interrupt_cells * sizeof(u_int), KM_SLEEP);
-       memcpy(specifier, node_specifier, interrupt_cells * 4);
-
        *piphandle = interrupt_parent;
 
-       return specifier;
+       return node_specifier;
 }