linux-kernel - [PATCH] x86/cpu: remove needless definition for !CONFIG_X86

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Date:   Mon, 16 Nov 2020 10:42:18 +0100
From:   Lukas Bulwahn <lukas.bulwahn@...il.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org
Cc:     "H . Peter Anvin" <hpa@...or.com>, Arnd Bergmann <arnd@...db.de>,
        Tom Rix <trix@...hat.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        clang-built-linux@...glegroups.com,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
        Lukas Bulwahn <lukas.bulwahn@...il.com>
Subject: [PATCH] x86/cpu: remove needless definition for !CONFIG_X86_32

The function flag_is_changeable_p() is used in:

  - have_cpuid_p() for its CONFIG_X86_32 definition
  - identify_cpu_without_cpuid() within its CONFIG_X86_32 ifdef-block

So, there is no need to define flag_is_changeable_p() if !CONFIG_X86_32.
Simply remove this needless definition.

This was discovered with make CC=clang W=1:

  arch/x86/kernel/cpu/common.c:283:19:
    warning: unused function 'flag_is_changeable_p' [-Wunused-function]

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@...il.com>
---
applies cleanly on current master and next-20201116

Thomas, Boris, please pick this minor non-urgent patch.

 arch/x86/kernel/cpu/common.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 35ad8480c464..b89dbc7ccb0c 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -280,10 +280,6 @@ 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)
-{
-	return 1;
-}
 static inline void squash_the_stupid_serial_number(struct cpuinfo_x86 *c)
 {
 }
-- 
2.17.1