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bootconfig: Allocate xbc_nodes array dynamically

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To reduce the large static array from kernel data, allocate
xbc_nodes array dynamically only if the kernel loads a
bootconfig.

Note that this also add dummy memblock.h for user-spacae
bootconfig tool.

Link: http://lkml.kernel.org/r/158108569699.3187.6512834527603883707.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu 2020-02-07 23:28:17 +09:00 committed by Steven Rostedt (VMware)
parent f61872bb58
commit a91e4f12ff
2 changed files with 24 additions and 3 deletions
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15
lib/bootconfig.c
View File

@ -6,12 +6,13 @@
#define pr_fmt(fmt) "bootconfig: " fmt
#include <linux/bootconfig.h>
#include <linux/bug.h>
#include <linux/ctype.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/memblock.h>
#include <linux/printk.h>
#include <linux/bootconfig.h>
#include <linux/string.h>
/*
@ -23,7 +24,7 @@
* node (for array).
*/
static struct xbc_node xbc_nodes[XBC_NODE_MAX] __initdata;
static struct xbc_node *xbc_nodes __initdata;
static int xbc_node_num __initdata;
static char *xbc_data __initdata;
static size_t xbc_data_size __initdata;
@ -719,7 +720,8 @@ void __init xbc_destroy_all(void)
xbc_data = NULL;
xbc_data_size = 0;
xbc_node_num = 0;
memset(xbc_nodes, 0, sizeof(xbc_nodes));
memblock_free(__pa(xbc_nodes), sizeof(struct xbc_node) * XBC_NODE_MAX);
xbc_nodes = NULL;
}
/**
@ -748,6 +750,13 @@ int __init xbc_init(char *buf)
return -ERANGE;
}
xbc_nodes = memblock_alloc(sizeof(struct xbc_node) * XBC_NODE_MAX,
SMP_CACHE_BYTES);
if (!xbc_nodes) {
pr_err("Failed to allocate memory for bootconfig nodes.\n");
return -ENOMEM;
}
memset(xbc_nodes, 0, sizeof(struct xbc_node) * XBC_NODE_MAX);
xbc_data = buf;
xbc_data_size = ret + 1;
last_parent = NULL;

12
tools/bootconfig/include/linux/memblock.h Normal file
View File

@ -0,0 +1,12 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _XBC_LINUX_MEMBLOCK_H
#define _XBC_LINUX_MEMBLOCK_H
#include <stdlib.h>
#define __pa(addr) (addr)
#define SMP_CACHE_BYTES 0
#define memblock_alloc(size, align) malloc(size)
#define memblock_free(paddr, size) free(paddr)
#endif