From 61dbbaeb86c2181c79efae2d186193e0f8008af1 Mon Sep 17 00:00:00 2001 From: Helge Deller <deller@gmx.de> Date: Sun, 13 Oct 2013 21:11:30 +0200 Subject: 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> --- arch/parisc/mm/fault.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'arch/parisc/mm') diff --git a/arch/parisc/mm/fault.c b/arch/parisc/mm/fault.c index 0293588d5b8c..df0d32971cdf 100644 --- a/arch/parisc/mm/fault.c +++ b/arch/parisc/mm/fault.c @@ -142,6 +142,12 @@ int fixup_exception(struct pt_regs *regs) { 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; -- cgit v1.2.3