kcov: mark in_softirq_really() as __always_inline

kcov: mark in_softirq_really() as __always_inline

If gcc decides not to inline in_softirq_really(), objtool warns about a
function call with UACCESS enabled:

kernel/kcov.o: warning: objtool: __sanitizer_cov_trace_pc+0x1e: call to in_softirq_really() with UACCESS enabled
kernel/kcov.o: warning: objtool: check_kcov_mode+0x11: call to in_softirq_really() with UACCESS enabled

Mark this as __always_inline to avoid the problem.

Link: https://lkml.kernel.org/r/20241217071814.2261620-1-arnd@kernel.org
Fixes: 7d4df2dad312 ("kcov: properly check for softirq context")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Marco Elver <elver@google.com>
Cc: Aleksandr Nogikh <nogikh@google.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Josh Poimboeuf <jpoimboe@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>