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check the result value of pmap_extract() and panic if it fails.

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this is a "should never fail" case, and GCC 10 noticed that it
allows an uninitialised variable use.

tested by rin@ on amiga and mac68k.
This commit is contained in:
mrg 2021-04-16 00:13:48 +00:00
parent 87e1399e00
commit 73171c26e4
1 changed files with 7 additions and 3 deletions
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10
sys/arch/m68k/m68k/pmap_motorola.c
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@ -1,4 +1,4 @@
/* $NetBSD: pmap_motorola.c,v 1.73 2021/02/01 19:02:27 skrll Exp $ */ /* $NetBSD: pmap_motorola.c,v 1.74 2021/04/16 00:13:48 mrg Exp $ */
/*- /*-
* Copyright (c) 1999 The NetBSD Foundation, Inc. * Copyright (c) 1999 The NetBSD Foundation, Inc.
@ -119,7 +119,7 @@
#include "opt_m68k_arch.h" #include "opt_m68k_arch.h"
#include <sys/cdefs.h> #include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: pmap_motorola.c,v 1.73 2021/02/01 19:02:27 skrll Exp $"); __KERNEL_RCSID(0, "$NetBSD: pmap_motorola.c,v 1.74 2021/04/16 00:13:48 mrg Exp $");
#include <sys/param.h> #include <sys/param.h>
#include <sys/systm.h> #include <sys/systm.h>
@ -1667,7 +1667,11 @@ pmap_collect1(pmap_t pmap, paddr_t startpa, paddr_t endpa)
* ST and Sysptmap entries. * ST and Sysptmap entries.
*/ */
(void) pmap_extract(pmap, pv->pv_va, &kpa); if (!pmap_extract(pmap, pv->pv_va, &kpa)) {
printf("collect: freeing KPT page at %lx (ste %x@%p)\n",
pv->pv_va, *pv->pv_ptste, pv->pv_ptste);
panic("pmap_collect: mapping not found");
}
pmap_remove_mapping(pmap, pv->pv_va, NULL, pmap_remove_mapping(pmap, pv->pv_va, NULL,
PRM_TFLUSH|PRM_CFLUSH, NULL); PRM_TFLUSH|PRM_CFLUSH, NULL);