| Message ID | 20201116024810.2415819-4-kuhn.chenqun@huawei.com |
|---|---|
| State | New |
| Headers | show |
| Series | silence the compiler warnings | expand |
Chen Qun <kuhn.chenqun@huawei.com> writes: > When using -Wimplicit-fallthrough in our CFLAGS on GCC9, the compiler showed warning: > ../accel/tcg/user-exec.c: In function ‘handle_cpu_signal’: > ../accel/tcg/user-exec.c:169:13: warning: this statement may fall through [-Wimplicit-fallthrough=] > 169 | cpu_exit_tb_from_sighandler(cpu, old_set); > | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > ../accel/tcg/user-exec.c:172:9: note: here > 172 | default: > > Mark the cpu_exit_tb_from_sighandler() function with QEMU_NORETURN to fix it. > > Reported-by: Euler Robot <euler.robot@huawei.com> > Signed-off-by: Chen Qun <kuhn.chenqun@huawei.com> > Reviewed-by: Richard Henderson <richard.henderson@linaro.org> > Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> > Reviewed-by: Thomas Huth <thuth@redhat.com> Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
diff --git a/accel/tcg/user-exec.c b/accel/tcg/user-exec.c index 4ebe25461a..293ee86ea4 100644 --- a/accel/tcg/user-exec.c +++ b/accel/tcg/user-exec.c @@ -49,7 +49,8 @@ __thread uintptr_t helper_retaddr; /* exit the current TB from a signal handler. The host registers are restored in a state compatible with the CPU emulator */ -static void cpu_exit_tb_from_sighandler(CPUState *cpu, sigset_t *old_set) +static void QEMU_NORETURN cpu_exit_tb_from_sighandler(CPUState *cpu, + sigset_t *old_set) { /* XXX: use siglongjmp ? */ sigprocmask(SIG_SETMASK, old_set, NULL);
When using -Wimplicit-fallthrough in our CFLAGS on GCC9, the compiler showed warning: ../accel/tcg/user-exec.c: In function ‘handle_cpu_signal’: ../accel/tcg/user-exec.c:169:13: warning: this statement may fall through [-Wimplicit-fallthrough=] 169 | cpu_exit_tb_from_sighandler(cpu, old_set); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ../accel/tcg/user-exec.c:172:9: note: here 172 | default: Mark the cpu_exit_tb_from_sighandler() function with QEMU_NORETURN to fix it. Reported-by: Euler Robot <euler.robot@huawei.com> Signed-off-by: Chen Qun <kuhn.chenqun@huawei.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Thomas Huth <thuth@redhat.com> --- v1->v2: Add QEMU_NORETURN to cpu_exit_tb_from_sighandler() function to avoid the compiler warnings(Base on Thomas's and Richard's comments). Cc: Thomas Huth <thuth@redhat.com> Cc: Riku Voipio <riku.voipio@iki.fi> Cc: Richard Henderson <richard.henderson@linaro.org> Cc: Paolo Bonzini <pbonzini@redhat.com> --- accel/tcg/user-exec.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)