gcc 5 supports a new -mcount-record option to generate ftrace tables directly. This avoids the need to run record_mcount manually. Use this option when available. So far doesn't use -mcount-nop, which also exists now. This is needed to make ftrace work with LTO because the normal record-mcount script doesn't run over the link time output. It should also improve build times slightly in the general case. Link: http://lkml.kernel.org/r/20171127213423.27218-12-andi@firstfloor.org
Unified · Split
| @@ -207,6 +207,11 @@ cmd_modversions_c = \ · 206 unmodified lines | |||
| 207 | endif | 207 | endif |
| 208 | 208 | ||
| 209 | ifdef CONFIG_FTRACE_MCOUNT_RECORD | 209 | ifdef CONFIG_FTRACE_MCOUNT_RECORD |
| 210 | # gcc 5 supports generating the mcount tables directly | ||
| 211 | ifneq ($(call cc-option,-mrecord-mcount,y),y) | ||
| 212 | KBUILD_CFLAGS += -mrecord-mcount | ||
| 213 | else | ||
| 214 | # else do it all manually | ||
| 210 | ifdef BUILD_C_RECORDMCOUNT | 215 | ifdef BUILD_C_RECORDMCOUNT |
| 211 | ifeq ("$(origin RECORDMCOUNT_WARN)", "command line") | 216 | ifeq ("$(origin RECORDMCOUNT_WARN)", "command line") |
| 212 | RECORDMCOUNT_FLAGS = -w | 217 | RECORDMCOUNT_FLAGS = -w |
| @@ -259,6 +264,7 @@ ifneq ($(RETPOLINE_CFLAGS),) · 46 unmodified lines | |||
| 259 | objtool_args += --retpoline | 264 | objtool_args += --retpoline |
| 260 | endif | 265 | endif |
| 261 | endif | 266 | endif |
| 267 | endif | ||
| 262 | 268 | ||
| 263 | 269 | ||
| 264 | ifdef CONFIG_MODVERSIONS | 270 | ifdef CONFIG_MODVERSIONS |