3.16-stable review patch. If anyone has any objections, please let me know.
------------------ From: Alex Smith <[email protected]> commit 656ff9bef08c19a6471b49528dacb4cbbeb1e537 upstream. Whenever ptrace attempts to retrieve the FPU implementation register it accesses it through current_cpu_data, which calls smp_processor_id(). Since the code may execute with preemption enabled, this can trigger a warning. Fix this by using boot_cpu_data to get the IR instead. Signed-off-by: Alex Smith <[email protected]> Cc: [email protected] Patchwork: https://patchwork.linux-mips.org/patch/7449/ Signed-off-by: Ralf Baechle <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- arch/mips/kernel/ptrace.c | 4 ++-- arch/mips/kernel/ptrace32.c | 2 +- 2 files changed, 3 insertions(+), 3 deletions(-) --- a/arch/mips/kernel/ptrace.c +++ b/arch/mips/kernel/ptrace.c @@ -129,7 +129,7 @@ int ptrace_getfpregs(struct task_struct } __put_user(child->thread.fpu.fcr31, data + 64); - __put_user(current_cpu_data.fpu_id, data + 65); + __put_user(boot_cpu_data.fpu_id, data + 65); return 0; } @@ -611,7 +611,7 @@ long arch_ptrace(struct task_struct *chi break; case FPC_EIR: /* implementation / version register */ - tmp = current_cpu_data.fpu_id; + tmp = boot_cpu_data.fpu_id; break; case DSP_BASE ... DSP_BASE + 5: { dspreg_t *dregs; --- a/arch/mips/kernel/ptrace32.c +++ b/arch/mips/kernel/ptrace32.c @@ -129,7 +129,7 @@ long compat_arch_ptrace(struct task_stru break; case FPC_EIR: /* implementation / version register */ - tmp = current_cpu_data.fpu_id; + tmp = boot_cpu_data.fpu_id; break; case DSP_BASE ... DSP_BASE + 5: { dspreg_t *dregs; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
