Re: [PATCH] powerpc/ftrace: Create a dummy stackframe to fix stack unwind

On Wed, 21 Jun 2023 10:43:49 +0530, Naveen N Rao wrote: > With ppc64 -mprofile-kernel and ppc32 -pg, profiling instructions to > call into ftrace are emitted right at function entry. The instruction > sequence used is minimal to reduce overhead. Crucially, a stackframe is > not created for the

[PATCH] powerpc/ftrace: Create a dummy stackframe to fix stack unwind

With ppc64 -mprofile-kernel and ppc32 -pg, profiling instructions to call into ftrace are emitted right at function entry. The instruction sequence used is minimal to reduce overhead. Crucially, a stackframe is not created for the function being traced. This breaks stack unwinding since the

[RFC PATCH] powerpc/ftrace: Create a dummy stackframe to fix stack unwind

With ppc64 -mprofile-kernel and ppc32 -pg, profiling instructions to call into ftrace are emitted right at function entry. The instruction sequence used is minimal to reduce overhead. Crucially, a stackframe is not created for the function being traced. This breaks stack unwinding since the