linux-kernel - [tip:x86/urgent] x86/cpufeature: Fix __percpu annotation in this_cpu

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Date:   Thu, 28 Mar 2019 09:13:13 -0700
From:   tip-bot for Jann Horn <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org, mingo@...nel.org,
        bp@...e.de, jannh@...gle.com, mingo@...hat.com, hpa@...or.com,
        tglx@...utronix.de, yamada.masahiro@...ionext.com, namit@...are.com
Subject: [tip:x86/urgent] x86/cpufeature: Fix __percpu annotation in
 this_cpu_has()

Commit-ID:  f6027c81099e87516d27d123867f10abd04b2d38
Gitweb:     https://git.kernel.org/tip/f6027c81099e87516d27d123867f10abd04b2d38
Author:     Jann Horn <jannh@...gle.com>
AuthorDate: Thu, 28 Mar 2019 16:49:48 +0100
Committer:  Borislav Petkov <bp@...e.de>
CommitDate: Thu, 28 Mar 2019 17:03:11 +0100

x86/cpufeature: Fix __percpu annotation in this_cpu_has()

&cpu_info.x86_capability is __percpu, and the second argument of
x86_this_cpu_test_bit() is expected to be __percpu. Don't cast the
__percpu away and then implicitly add it again. This gets rid of 106
lines of sparse warnings with the kernel config I'm using.

Signed-off-by: Jann Horn <jannh@...gle.com>
Signed-off-by: Borislav Petkov <bp@...e.de>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc: Nadav Amit <namit@...are.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: x86-ml <x86@...nel.org>
Link: https://lkml.kernel.org/r/20190328154948.152273-1-jannh@google.com
---
 arch/x86/include/asm/cpufeature.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h
index ce95b8cbd229..0e56ff7e4848 100644
--- a/arch/x86/include/asm/cpufeature.h
+++ b/arch/x86/include/asm/cpufeature.h
@@ -112,8 +112,9 @@ extern const char * const x86_bug_flags[NBUGINTS*32];
 	 test_cpu_cap(c, bit))
 
 #define this_cpu_has(bit)						\
-	(__builtin_constant_p(bit) && REQUIRED_MASK_BIT_SET(bit) ? 1 : 	\
-	 x86_this_cpu_test_bit(bit, (unsigned long *)&cpu_info.x86_capability))
+	(__builtin_constant_p(bit) && REQUIRED_MASK_BIT_SET(bit) ? 1 :	\
+	 x86_this_cpu_test_bit(bit,					\
+		(unsigned long __percpu *)&cpu_info.x86_capability))
 
 /*
  * This macro is for detection of features which need kernel