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extable: Add function to search only kernel exception table

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Certain architecture specific operating modes (e.g., in powerpc machine
check handler that is unable to access vmalloc memory), the
search_exception_tables cannot be called because it also searches the
module exception tables if entry is not found in the kernel exception
table.

Signed-off-by: Santosh Sivaraj <santosh@fossix.org>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190820081352.8641-5-santosh@fossix.org
This commit is contained in:
Santosh Sivaraj 2019-08-20 13:43:49 +05:30 committed by Michael Ellerman
parent 1a1715f516
commit 49ec9177b8
2 changed files with 11 additions and 2 deletions
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2
include/linux/extable.h
View File

@ -19,6 +19,8 @@ void trim_init_extable(struct module *m);
/* Given an address, look for it in the exception tables */
const struct exception_table_entry *search_exception_tables(unsigned long add);
const struct exception_table_entry *
search_kernel_exception_table(unsigned long addr);
#ifdef CONFIG_MODULES
/* For extable.c to search modules' exception tables. */

11
kernel/extable.c
View File

@ -40,13 +40,20 @@ void __init sort_main_extable(void)
}
}
/* Given an address, look for it in the kernel exception table */
const
struct exception_table_entry *search_kernel_exception_table(unsigned long addr)
{
return search_extable(__start___ex_table,
__stop___ex_table - __start___ex_table, addr);
}
/* 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 - __start___ex_table, addr);
e = search_kernel_exception_table(addr);
if (!e)
e = search_module_extables(addr);
return e;