[PATCH 2/2] x86: disable CONFIG_GENERIC_HWEIGHT and remove __HAVE_ARCH_SW_HWEIGHT

From: Masahiro Yamada <yamada.masahiro@socionext.com>
To: Ingo Molnar <mingo@redhat.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Borislav Petkov <bp@alien8.de>, "H . Peter Anvin" <hpa@zytor.com>,
	x86@kernel.org
Cc: Kalle Valo <kvalo@codeaurora.org>,
	linux-wireless@vger.kernel.org, Christoph Hellwig <hch@lst.de>,
	Masahiro Yamada <yamada.masahiro@socionext.com>,
	linux-kernel@vger.kernel.org
Subject: [PATCH 2/2] x86: disable CONFIG_GENERIC_HWEIGHT and remove __HAVE_ARCH_SW_HWEIGHT
Date: Mon, 18 Feb 2019 14:59:31 +0900	[thread overview]
Message-ID: <1550469571-25933-3-git-send-email-yamada.masahiro@socionext.com> (raw)
In-Reply-To: <1550469571-25933-1-git-send-email-yamada.masahiro@socionext.com>

arch/x86/include/asm/arch_hweight.h uses __sw_hweight{32,64} as
alternatives, but they are implemented in arch/x86/lib/hweight.S

x86 does not rely on the generic C implementation lib/hweight.c
at all, so CONFIG_GENERIC_HWEIGHT should be disabled.

__HAVE_ARCH_SW_HWEIGHT was unneeded in the first place.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
---

 arch/x86/Kconfig                    | 3 ---
 arch/x86/include/asm/arch_hweight.h | 2 --
 lib/hweight.c                       | 4 ----
 3 files changed, 9 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 6826143..c2813af 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -262,9 +262,6 @@ config GENERIC_BUG
 config GENERIC_BUG_RELATIVE_POINTERS
 	bool
 
-config GENERIC_HWEIGHT
-	def_bool y
-
 config ARCH_MAY_HAVE_PC_FDC
 	def_bool y
 	depends on ISA_DMA_API
diff --git a/arch/x86/include/asm/arch_hweight.h b/arch/x86/include/asm/arch_hweight.h
index fc06935..ba88edd 100644
--- a/arch/x86/include/asm/arch_hweight.h
+++ b/arch/x86/include/asm/arch_hweight.h
@@ -12,8 +12,6 @@
 #define REG_OUT "a"
 #endif
 
-#define __HAVE_ARCH_SW_HWEIGHT
-
 static __always_inline unsigned int __arch_hweight32(unsigned int w)
 {
 	unsigned int res;
diff --git a/lib/hweight.c b/lib/hweight.c
index 7660d88..c94586b 100644
--- a/lib/hweight.c
+++ b/lib/hweight.c
@@ -10,7 +10,6 @@
  * The Hamming Weight of a number is the total number of bits set in it.
  */
 
-#ifndef __HAVE_ARCH_SW_HWEIGHT
 unsigned int __sw_hweight32(unsigned int w)
 {
 #ifdef CONFIG_ARCH_HAS_FAST_MULTIPLIER
@@ -27,7 +26,6 @@ unsigned int __sw_hweight32(unsigned int w)
 #endif
 }
 EXPORT_SYMBOL(__sw_hweight32);
-#endif
 
 unsigned int __sw_hweight16(unsigned int w)
 {
@@ -46,7 +44,6 @@ unsigned int __sw_hweight8(unsigned int w)
 }
 EXPORT_SYMBOL(__sw_hweight8);
 
-#ifndef __HAVE_ARCH_SW_HWEIGHT
 unsigned long __sw_hweight64(__u64 w)
 {
 #if BITS_PER_LONG == 32
@@ -69,4 +66,3 @@ unsigned long __sw_hweight64(__u64 w)
 #endif
 }
 EXPORT_SYMBOL(__sw_hweight64);
-#endif
-- 
2.7.4

