powerpc/radix: Remove trace_tlbie call from radix__flush_tlb_all

BugLink: http://bugs.launchpad.net/bugs/1751131
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>
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>

diff --git a/arch/powerpc/mm/tlb-radix.c b/arch/powerpc/mm/tlb-radix.c
index 884f4b705b572ddc66444079c9ed596f10a20312..913a2b81b177026d71d35113af14aec403d90b61 100644 (file)
--- 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,