forked from luck/tmp_suning_uos_patched
5e37661389
Even since a previous patch: Fix race between CONFIG_DEBUG_SLABALLOC and modules Sun, 27 Jun 2004 17:55:19 +0000 (17:55 +0000) http://www.kernel.org/git/?p=linux/kernel/git/torvalds/old-2.6-bkcvs.git;a=commit;h=92b3db26d31cf21b70e3c1eadc56c179506d8fbe The function symbol_put_addr() will deadlock the kernel. symbol_put_addr() would acquire modlist_lock, then while holding the lock call two functions kernel_text_address() and module_text_address() which also try to acquire the same lock. This deadlocks the kernel of course. This patch changes symbol_put_addr() to not acquire the modlist_lock, it doesn't need it since it never looks at the module list directly. Also, it now uses core_kernel_text() instead of kernel_text_address(). The latter has an additional check for addr inside a module, but we don't need to do that since we call module_text_address() (the same function kernel_text_address uses) ourselves. Signed-off-by: Trent Piepho <xyzzy@speakeasy.org> Cc: Zwane Mwaikambo <zwane@fsmlabs.com> Acked-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Johannes Stezenbach <js@linuxtv.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
68 lines
2.0 KiB
C
68 lines
2.0 KiB
C
/* Rewritten by Rusty Russell, on the backs of many others...
|
|
Copyright (C) 2001 Rusty Russell, 2002 Rusty Russell IBM.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/sections.h>
|
|
|
|
extern struct exception_table_entry __start___ex_table[];
|
|
extern struct exception_table_entry __stop___ex_table[];
|
|
|
|
/* Sort the kernel's built-in exception table */
|
|
void __init sort_main_extable(void)
|
|
{
|
|
sort_extable(__start___ex_table, __stop___ex_table);
|
|
}
|
|
|
|
/* Given an address, look for it in the exception tables. */
|
|
const struct exception_table_entry *search_exception_tables(unsigned long addr)
|
|
{
|
|
const struct exception_table_entry *e;
|
|
|
|
e = search_extable(__start___ex_table, __stop___ex_table-1, addr);
|
|
if (!e)
|
|
e = search_module_extables(addr);
|
|
return e;
|
|
}
|
|
|
|
int core_kernel_text(unsigned long addr)
|
|
{
|
|
if (addr >= (unsigned long)_stext &&
|
|
addr <= (unsigned long)_etext)
|
|
return 1;
|
|
|
|
if (addr >= (unsigned long)_sinittext &&
|
|
addr <= (unsigned long)_einittext)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
int __kernel_text_address(unsigned long addr)
|
|
{
|
|
if (core_kernel_text(addr))
|
|
return 1;
|
|
return __module_text_address(addr) != NULL;
|
|
}
|
|
|
|
int kernel_text_address(unsigned long addr)
|
|
{
|
|
if (core_kernel_text(addr))
|
|
return 1;
|
|
return module_text_address(addr) != NULL;
|
|
}
|