On Mon, Nov 11, 2024 at 12:51:25AM +0900, Masami Hiramatsu (Google) wrote: > From: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx> > > Fprobe store its data structure address and size on the fgraph return stack > by __fprobe_header. But most 64bit architecture can combine those to > one unsigned long value because 4 MSB in the kernel address are the same. > With this encoding, fprobe can consume less space on ret_stack. > > This introduces asm/fprobe.h to define arch dependent encode/decode > macros. Note that since fprobe depends on CONFIG_HAVE_FUNCTION_GRAPH_FREGS, > currently only arm64, loongarch, riscv, s390 and x86 are supported. > > Signed-off-by: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx> > --- > arch/arm64/include/asm/Kbuild | 1 + > arch/loongarch/include/asm/fprobe.h | 12 +++++++++ > arch/riscv/include/asm/Kbuild | 1 + > arch/s390/include/asm/fprobe.h | 10 ++++++++ Acked-by: Heiko Carstens <hca@xxxxxxxxxxxxx> # s390
