parisc: provide macro to create exception table entries
Provide a macro ASM_EXCEPTIONTABLE_ENTRY() to create exception table
entries and convert all open-coded places to use that macro.
This patch is a first step toward creating a exception table which only
holds 32bit pointers even on a 64bit kernel. That way in my own kernel
I was able to reduce the in-kernel exception table from 44kB to 22kB.
Signed-off-by: Helge Deller <deller@gmx.de>
diff --git a/arch/parisc/mm/fault.c b/arch/parisc/mm/fault.c
index 0293588..df0d329 100644
--- a/arch/parisc/mm/fault.c
+++ b/arch/parisc/mm/fault.c
@@ -142,6 +142,12 @@
{
const struct exception_table_entry *fix;
+ /* If we only stored 32bit addresses in the exception table we can drop
+ * out if we faulted on a 64bit address. */
+ if ((sizeof(regs->iaoq[0]) > sizeof(fix->insn))
+ && (regs->iaoq[0] >> 32))
+ return 0;
+
fix = search_exception_tables(regs->iaoq[0]);
if (fix) {
struct exception_data *d;