I wrote a tiny malloc (libc-style) implementation over a small static
storage (could be over stack or preallocated on the heap) without any
external dependencies.
Would it be useful for you?
On 01.06.2020 01:34, Rin Okuyama wrote:
> Module Name: src
> Committed By: rin
> Date: Sun May 31 23:34:34 UTC 2020
>
> Modified Files:
> src/sys/ddb: db_kernel.c
>
> Log Message:
> Switch from kmem_intr_alloc(sz, KM_NOSLEEP) to kmem_alloc(sz, KM_SLEEP).
>
> Clearly document these functions are *not* for DDB session, but for
> permanent data storage when initializing DDB.
>
>
> To generate a diff of this commit:
> cvs rdiff -u -r1.3 -r1.4 src/sys/ddb/db_kernel.c
>
> Please note that diffs are not public domain; they are subject to the
> copyright notices on the relevant files.
>
>
> Modified files:
>
> Index: src/sys/ddb/db_kernel.c
> diff -u src/sys/ddb/db_kernel.c:1.3 src/sys/ddb/db_kernel.c:1.4
> --- src/sys/ddb/db_kernel.c:1.3 Sun May 31 09:42:46 2020
> +++ src/sys/ddb/db_kernel.c Sun May 31 23:34:34 2020
> @@ -1,4 +1,4 @@
> -/* $NetBSD: db_kernel.c,v 1.3 2020/05/31 09:42:46 rin Exp $ */
> +/* $NetBSD: db_kernel.c,v 1.4 2020/05/31 23:34:34 rin Exp $ */
>
> /*-
> * Copyright (c) 2009 The NetBSD Foundation, Inc.
> @@ -30,7 +30,7 @@
> */
>
> #include <sys/cdefs.h>
> -__KERNEL_RCSID(0, "$NetBSD: db_kernel.c,v 1.3 2020/05/31 09:42:46 rin Exp $");
> +__KERNEL_RCSID(0, "$NetBSD: db_kernel.c,v 1.4 2020/05/31 23:34:34 rin Exp $");
>
> #include <sys/param.h>
> #include <sys/kmem.h>
> @@ -39,28 +39,33 @@ __KERNEL_RCSID(0, "$NetBSD: db_kernel.c,
>
> /*
> * XXX
> - * DDB can be running in the interrupt context, e.g., when activated from
> - * console. Therefore, we use kmem_intr_alloc(9) and friends here to avoid
> - * assertion failure.
> + * These routines are *not* intended for a DDB session:
> + *
> + * - It disturbes on-going debugged kernel datastructures.
> + *
> + * - DDB can be running in the interrupt context, e.g., when activated from
> + * console. This results in assertion failures in the allocator.
> + *
> + * Use these only for permanent data storage when initializing DDB.
> */
>
> void *
> db_alloc(size_t sz)
> {
>
> - return kmem_intr_alloc(sz, KM_NOSLEEP);
> + return kmem_alloc(sz, KM_SLEEP);
> }
>
> void *
> db_zalloc(size_t sz)
> {
>
> - return kmem_intr_zalloc(sz, KM_NOSLEEP);
> + return kmem_zalloc(sz, KM_SLEEP);
> }
>
> void
> db_free(void *p, size_t sz)
> {
>
> - kmem_intr_free(p, sz);
> + kmem_free(p, sz);
> }
>
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