Commit 49ec9177 authored by Santosh Sivaraj's avatar Santosh Sivaraj Committed by Michael Ellerman
Browse files

extable: Add function to search only kernel exception table 



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: default avatarSantosh Sivaraj <santosh@fossix.org>
Reviewed-by: default avatarNicholas Piggin <npiggin@gmail.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190820081352.8641-5-santosh@fossix.org
parent 1a1715f5

include/linux/extable.h

+2 −0
Original line number Diff line number Diff line
@@ -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. */

kernel/extable.c

+9 −2
Original line number Diff line number Diff line
@@ -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;

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