[Xen-devel] [PATCH v5 4/9] x86/traps: Enable all exception handler callbacks early

[Andy Lutomirski <luto@xxxxxxxxxx>]

Now that early_fixup_exception has pt_regs, we can just call
fixup_exception from it.  This will make fancy exception handlers
work early.

Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxx>
---
 arch/x86/mm/extable.c | 19 ++-----------------
 1 file changed, 2 insertions(+), 17 deletions(-)

diff --git a/arch/x86/mm/extable.c b/arch/x86/mm/extable.c
index 8997022abebc..50dfe438bd91 100644
--- a/arch/x86/mm/extable.c
+++ b/arch/x86/mm/extable.c
@@ -95,10 +95,6 @@ extern unsigned int early_recursion_flag;
 /* Restricted version used during very early boot */
 void __init early_fixup_exception(struct pt_regs *regs, int trapnr)
 {
-       const struct exception_table_entry *e;
-       unsigned long new_ip;
-       ex_handler_t handler;
-
        /* Ignore early NMIs. */
        if (trapnr == X86_TRAP_NMI)
                return;
@@ -109,19 +105,8 @@ void __init early_fixup_exception(struct pt_regs *regs, 
int trapnr)
        if (regs->cs != __KERNEL_CS)
                goto fail;
 
-       e = search_exception_tables(regs->ip);
-       if (!e)
-               goto fail;
-
-       new_ip  = ex_fixup_addr(e);
-       handler = ex_fixup_handler(e);
-
-       /* special handling not supported during early boot */
-       if (handler != ex_handler_default)
-               goto fail;
-
-       regs->ip = new_ip;
-       return;
+       if (fixup_exception(regs, trapnr))
+               return;
 
 fail:
        early_printk("PANIC: early exception 0x%02x IP %lx:%lx error %lx cr2 
0x%lx\n",
-- 
2.5.5


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