[PATCH 4.12 023/196] perf intel-pt: Ensure never to set last_ip when packet count is zero

4.12-stable review patch. If anyone has any objections, please let me know. -- From: Adrian Hunter commit f952eaceb089b691eba7c4e13686e742a8f26bf5 upstream. Intel PT uses IP compression based on the last IP. For decoding purposes, 'last IP' is not

[PATCH 4.12 023/196] perf intel-pt: Ensure never to set last_ip when packet count is zero

4.12-stable review patch. If anyone has any objections, please let me know. -- From: Adrian Hunter commit f952eaceb089b691eba7c4e13686e742a8f26bf5 upstream. Intel PT uses IP compression based on the last IP. For decoding purposes, 'last IP' is not updated when a branch target