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%3Ba=su...
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@vger.kernel.org know about it.
From 8d81296cfcce89013a714feb8d25004a156f8181 Mon Sep 17 00:00:00 2001
From: Mahesh Salgaonkar mahesh@linux.vnet.ibm.com 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@linux.vnet.ibm.com
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@vger.kernel.org # v4.13+ Signed-off-by: Mahesh Salgaonkar mahesh@linux.vnet.ibm.com Acked-by: Balbir Singh bsingharora@gmail.com Signed-off-by: Michael Ellerman mpe@ellerman.id.au Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- 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@linux.vnet.ibm.com are
queue-4.15/powerpc-radix-remove-trace_tlbie-call-from-radix__flush_tlb_all.patch