[PATCH 4.15 019/163] powerpc/radix: Remove trace_tlbie call from radix__flush_tlb_all

Greg Kroah-Hartman
2018-02-21T12:47:28Z

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,