From: Tony Luck <tony.luck@intel.com>
Date: Mon, 25 Apr 2005 20:22:44 +0000 (-0700)
Subject: [IA64] Need to handle lfetch in "no_context" case.
X-Git-Tag: firefly_0821_release~43457^2~9
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=f0a8d3c9ec1f82d2a41faa6c46b8db7bd5b1eb8d;p=firefly-linux-kernel-4.4.55.git

[IA64] Need to handle lfetch in "no_context" case.

Thanks to Mark for tracking down this one.  Users of __copy_from_user_inatomic()
will be sad if we don't handle lfetch faults for the "no_context" case.

Signed-off-by: Tony Luck <tony.luck@intel.com>
---

diff --git a/arch/ia64/mm/fault.c b/arch/ia64/mm/fault.c
index da859125aaef..4174ec999dde 100644
--- a/arch/ia64/mm/fault.c
+++ b/arch/ia64/mm/fault.c
@@ -209,10 +209,13 @@ ia64_do_page_fault (unsigned long address, unsigned long isr, struct pt_regs *re
 	}
 
   no_context:
-	if (isr & IA64_ISR_SP) {
+	if ((isr & IA64_ISR_SP)
+	    || ((isr & IA64_ISR_NA) && (isr & IA64_ISR_CODE_MASK) == IA64_ISR_CODE_LFETCH))
+	{
 		/*
-		 * This fault was due to a speculative load set the "ed" bit in the psr to
-		 * ensure forward progress (target register will get a NaT).
+		 * This fault was due to a speculative load or lfetch.fault, set the "ed"
+		 * bit in the psr to ensure forward progress.  (Target register will get a
+		 * NaT for ld.s, lfetch will be canceled.)
 		 */
 		ia64_psr(regs)->ed = 1;
 		return;