[PATCH,RFC 2.6.14 07/15] x86_64: Add a notifier hook to the "no context" part of do_page_fault

[Tom Rini <trini@kernel.crashing.org>]

This adds a call to notify_die() in the "no context" portion of
do_page_fault() as someone on the chain might care and want to do a fixup.

 arch/x86_64/mm/fault.c      |    4 ++++
 include/asm-x86_64/kdebug.h |    1 +
 2 files changed, 5 insertions(+)

Index: linux-2.6.14/arch/x86_64/mm/fault.c
===================================================================
--- linux-2.6.14.orig/arch/x86_64/mm/fault.c
+++ linux-2.6.14/arch/x86_64/mm/fault.c
@@ -518,6 +518,10 @@ no_context:
 	if (is_errata93(regs, address))
 		return; 
 
+	if (notify_die(DIE_PAGE_FAULT_NO_CONTEXT, "no context", regs,
+				error_code, 14, SIGSEGV) == NOTIFY_STOP)
+		return;
+
 /*
  * Oops. The kernel tried to access some bad page. We'll have to
  * terminate things with extreme prejudice.
Index: linux-2.6.14/include/asm-x86_64/kdebug.h
===================================================================
--- linux-2.6.14.orig/include/asm-x86_64/kdebug.h
+++ linux-2.6.14/include/asm-x86_64/kdebug.h
@@ -33,6 +33,7 @@ enum die_val { 
 	DIE_CALL,
 	DIE_NMI_IPI,
 	DIE_PAGE_FAULT,
+	DIE_PAGE_FAULT_NO_CONTEXT,
 }; 
 	
 static inline int notify_die(enum die_val val,char *str,struct pt_regs *regs,long err,int trap, int sig)

-- 
Tom
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