[PATCH v2 1/1] x86/cpu: Mark flag_is_changeable_p() with __maybe_unused

[Andy Shevchenko <andriy.shevchenko@linux.intel.com>]

When flag_is_changeable_p() is unused, it prevents kernel builds
with clang, `make W=1` and CONFIG_WERROR=y:

arch/x86/kernel/cpu/common.c:351:19: error: unused function 'flag_is_changeable_p' [-Werror,-Wunused-function]
  351 | static inline int flag_is_changeable_p(u32 flag)
      |                   ^~~~~~~~~~~~~~~~~~~~

Fix this by marking it with __maybe_unused (both cases for the sake of
symmetry).

See also commit 6863f5643dd7 ("kbuild: allow Clang to find unused static
inline functions for W=1 build").

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
v2: marked both 32- and 64-bit cases
 arch/x86/kernel/cpu/common.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index d4e539d4e158..4b35744ef9b2 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -287,7 +287,7 @@ static int __init cachesize_setup(char *str)
 __setup("cachesize=", cachesize_setup);
 
 /* Standard macro to see if a specific flag is changeable */
-static inline int flag_is_changeable_p(u32 flag)
+static inline __maybe_unused int flag_is_changeable_p(u32 flag)
 {
 	u32 f1, f2;
 
@@ -348,7 +348,7 @@ static int __init x86_serial_nr_setup(char *s)
 }
 __setup("serialnumber", x86_serial_nr_setup);
 #else
-static inline int flag_is_changeable_p(u32 flag)
+static inline __maybe_unused int flag_is_changeable_p(u32 flag)
 {
 	return 1;
 }
-- 
2.43.0.rc1.1336.g36b5255a03ac