[PATCH] perf/x86: fix 32-bit perf user callgraph collection

A basic perf callgraph record operation causes an immediate panic on a 32-bit kernel compiled with CONFIG_CC_STACKPROTECTOR: $ perf record -g ls Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: c0404fbd CPU: 0 PID: 998 Comm: ls Not tainted 4.7.0-rc5+ #1

[PATCH] perf/x86: fix 32-bit perf user callgraph collection

A basic perf callgraph record operation causes an immediate panic on a 32-bit kernel compiled with CONFIG_CC_STACKPROTECTOR: $ perf record -g ls Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: c0404fbd CPU: 0 PID: 998 Comm: ls Not tainted 4.7.0-rc5+ #1