This is a note to let you know that I've just added the patch titled
powerpc/radix: Remove trace_tlbie call from radix__flush_tlb_all
to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
powerpc-radix-remove-trace_tlbie-call-from-radix__flush_tlb_all.patch
and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 8d81296cfcce89013a714feb8d25004a156f8181 Mon Sep 17 00:00:00 2001
From: Mahesh Salgaonkar <mahesh@xxxxxxxxxxxxxxxxxx>
Date: Thu, 30 Nov 2017 14:35:54 +0530
Subject: powerpc/radix: Remove trace_tlbie call from radix__flush_tlb_all
From: Mahesh Salgaonkar <mahesh@xxxxxxxxxxxxxxxxxx>
commit 8d81296cfcce89013a714feb8d25004a156f8181 upstream.
radix__flush_tlb_all() is called only in kexec path in real mode and any
tracepoints at this stage will make kexec to fail if enabled.
To verify enable tlbie trace before kexec.
$ echo 1 > /sys/kernel/debug/tracing/events/powerpc/tlbie/enable
== kexec into new kernel and kexec fails.
Fix this by not calling trace_tlbie from radix__flush_tlb_all().
Fixes: 0428491cba92 ("powerpc/mm: Trace tlbie(l) instructions")
Cc: stable@xxxxxxxxxxxxxxx # v4.13+
Signed-off-by: Mahesh Salgaonkar <mahesh@xxxxxxxxxxxxxxxxxx>
Acked-by: Balbir Singh <bsingharora@xxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/mm/tlb-radix.c | 2 --
1 file changed, 2 deletions(-)
--- a/arch/powerpc/mm/tlb-radix.c
+++ b/arch/powerpc/mm/tlb-radix.c
@@ -600,14 +600,12 @@ void radix__flush_tlb_all(void)
*/
asm volatile(PPC_TLBIE_5(%0, %4, %3, %2, %1)
: : "r"(rb), "i"(r), "i"(1), "i"(ric), "r"(rs) : "memory");
- trace_tlbie(0, 0, rb, rs, ric, prs, r);
/*
* now flush host entires by passing PRS = 0 and LPID == 0
*/
asm volatile(PPC_TLBIE_5(%0, %4, %3, %2, %1)
: : "r"(rb), "i"(r), "i"(prs), "i"(ric), "r"(0) : "memory");
asm volatile("eieio; tlbsync; ptesync": : :"memory");
- trace_tlbie(0, 0, rb, 0, ric, prs, r);
}
void radix__flush_tlb_pte_p9_dd1(unsigned long old_pte, struct mm_struct *mm,
Patches currently in stable-queue which might be from mahesh@xxxxxxxxxxxxxxxxxx are
queue-4.15/powerpc-radix-remove-trace_tlbie-call-from-radix__flush_tlb_all.patch