https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81715
--- Comment #2 from Arnd Bergmann <arnd at linaro dot org> --- Created attachment 42178 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42178&action=edit preprocessed linux/drivers/media/dvb-frontends/stv090x.c, compressed This is one of the typical files showing the behavior, with stack sizes up to 8 KB using gcc, but only a few hundred bytes using clang: $ /home/arnd/cross-gcc/bin/x86_64-linux-gcc-8.0.0 -c /tmp/stv090x.i -Werror=frame-larger-than=256 -O2 -fsanitize=kernel-address --param asan-stack=0 # no warnings $ /home/arnd/cross-gcc/bin/x86_64-linux-gcc-8.0.0 -c stv090x.i -Werror=frame-larger-than=128 -O2 -fsanitize=kernel-address --param asan-stack=1 /git/arm-soc/drivers/media/dvb-frontends/stv090x.c: In function 'stv090x_i2c_gate_ctrl': /git/arm-soc/drivers/media/dvb-frontends/stv090x.c:810:1: error: the frame size of 288 bytes is larger than 256 bytes [-Werror=frame-larger-than=] /git/arm-soc/drivers/media/dvb-frontends/stv090x.c: In function 'stv090x_blind_search': /git/arm-soc/drivers/media/dvb-frontends/stv090x.c:2067:1: error: the frame size of 8688 bytes is larger than 256 bytes [-Werror=frame-larger-than=] } ^ /git/arm-soc/drivers/media/dvb-frontends/stv090x.c: In function 'stv090x_optimize_track': /git/arm-soc/drivers/media/dvb-frontends/stv090x.c:3089:1: error: the frame size of 5872 bytes is larger than 256 bytes [-Werror=frame-larger-than=] } ^ /git/arm-soc/drivers/media/dvb-frontends/stv090x.c: In function 'stv090x_search': /git/arm-soc/drivers/media/dvb-frontends/stv090x.c:3505:1: error: the frame size of 8016 bytes is larger than 256 bytes [-Werror=frame-larger-than=] } ^ /git/arm-soc/drivers/media/dvb-frontends/stv090x.c: In function 'stv090x_attach': /git/arm-soc/drivers/media/dvb-frontends/stv090x.c:4998:1: error: the frame size of 1152 bytes is larger than 256 bytes [-Werror=frame-larger-than=] $ /home/arnd/cross-gcc/bin/clang -Wframe-larger-than=256 /tmp/stv090x.i -c -Wall -Wno-constant-logical-operand -O2 -Wno-unused-value -Wno-pointer-sign -fsanitize=kernel-address -mllvm -asan-stack=0 /git/arm-soc/drivers/media/dvb-frontends/stv090x.c:3173:34: warning: stack frame size of 264 bytes in function 'stv090x_algo' [-Wframe-larger-than=] static enum stv090x_signal_state stv090x_algo(struct stv090x_state *state) $ /home/arnd/cross-gcc/bin/clang -Wframe-larger-than=256 /tmp/stv090x.i -c -Wall -Wno-constant-logical-operand -O2 -Wno-unused-value -Wno-pointer-sign -fsanitize=kernel-address -mllvm -asan-stack=1 /git/arm-soc/drivers/media/dvb-frontends/stv090x.c:756:12: warning: stack frame size of 280 bytes in function 'stv090x_write_reg' [-Wframe-larger-than=] static int stv090x_write_reg(struct stv090x_state *state, unsigned int reg, u8 data) ^ /git/arm-soc/drivers/media/dvb-frontends/stv090x.c:3173:34: warning: stack frame size of 376 bytes in function 'stv090x_algo' [-Wframe-larger-than=] static enum stv090x_signal_state stv090x_algo(struct stv090x_state *state) ^
