linux-kernel - [PATCH 10/16] drm/i915: remove always-defined CONFIG_AS

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Date:   Tue, 24 Mar 2020 17:48:15 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     "David S . Miller" <davem@...emloft.net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        clang-built-linux@...glegroups.com,
        Herbert Xu <herbert@...dor.apana.org.au>,
        linux-crypto@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        Peter Zijlstra <peterz@...radead.org>,
        "H . Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-kbuild@...r.kernel.org,
        Masahiro Yamada <masahiroy@...nel.org>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org
Subject: [PATCH 10/16] drm/i915: remove always-defined CONFIG_AS_MOVNTDQA

CONFIG_AS_MOVNTDQA was introduced by commit 0b1de5d58e19 ("drm/i915:
Use SSE4.1 movntdqa to accelerate reads from WC memory").

We raise the minimal supported binutils version from time to time.
The last bump was commit 1fb12b35e5ff ("kbuild: Raise the minimum
required binutils version to 2.21").

I confirmed the code in $(call as-instr,...) can be assembled by the
binutils 2.21 assembler and also by LLVM integrated assembler.

Remove CONFIG_AS_MOVNTDQA, which is always defined.

Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
---

 drivers/gpu/drm/i915/Makefile      | 3 ---
 drivers/gpu/drm/i915/i915_memcpy.c | 5 -----
 2 files changed, 8 deletions(-)

diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index a1f2411aa21b..e559e53fc634 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -28,9 +28,6 @@ subdir-ccflags-$(CONFIG_DRM_I915_WERROR) += -Werror
 CFLAGS_i915_pci.o = $(call cc-disable-warning, override-init)
 CFLAGS_display/intel_fbdev.o = $(call cc-disable-warning, override-init)
 
-subdir-ccflags-y += \
-	$(call as-instr,movntdqa (%eax)$(comma)%xmm0,-DCONFIG_AS_MOVNTDQA)
-
 subdir-ccflags-y += -I$(srctree)/$(src)
 
 # Please keep these build lists sorted!
diff --git a/drivers/gpu/drm/i915/i915_memcpy.c b/drivers/gpu/drm/i915/i915_memcpy.c
index fdd550405fd3..7b3b83bd5ab8 100644
--- a/drivers/gpu/drm/i915/i915_memcpy.c
+++ b/drivers/gpu/drm/i915/i915_memcpy.c
@@ -35,7 +35,6 @@
 
 static DEFINE_STATIC_KEY_FALSE(has_movntdqa);
 
-#ifdef CONFIG_AS_MOVNTDQA
 static void __memcpy_ntdqa(void *dst, const void *src, unsigned long len)
 {
 	kernel_fpu_begin();
@@ -93,10 +92,6 @@ static void __memcpy_ntdqu(void *dst, const void *src, unsigned long len)
 
 	kernel_fpu_end();
 }
-#else
-static void __memcpy_ntdqa(void *dst, const void *src, unsigned long len) {}
-static void __memcpy_ntdqu(void *dst, const void *src, unsigned long len) {}
-#endif
 
 /**
  * i915_memcpy_from_wc: perform an accelerated *aligned* read from WC
-- 
2.17.1