[tip:x86/pti] x86/retpoline: Remove compile time warning

[tip-bot for Thomas Gleixner]

Commit-ID:  b8b9ce4b5aec8de9e23cabb0a26b78641f9ab1d6
Gitweb: https://git.kernel.org/tip/b8b9ce4b5aec8de9e23cabb0a26b78641f9ab1d6
Author: Thomas Gleixner 
AuthorDate: Sun, 14 Jan 2018 22:13:29 +0100
Committer:  Thomas Gleixner 
CommitDate: Sun, 14 Jan 2018 22:29:36 +0100

x86/retpoline: Remove compile time warning

Remove the compile time warning when CONFIG_RETPOLINE=y and the compiler
does not have retpoline support. Linus rationale for this is:

  It's wrong because it will just make people turn off RETPOLINE, and the
  asm updates - and return stack clearing - that are independent of the
  compiler are likely the most important parts because they are likely the
  ones easiest to target.

  And it's annoying because most people won't be able to do anything about
  it. The number of people building their own compiler? Very small. So if
  their distro hasn't got a compiler yet (and pretty much nobody does), the
  warning is just annoying crap.

  It is already properly reported as part of the sysfs interface. The
  compile-time warning only encourages bad things.

Fixes: 76b043848fd2 ("x86/retpoline: Add initial retpoline support")
Requested-by: Linus Torvalds 
Signed-off-by: Thomas Gleixner 
Cc: David Woodhouse 
Cc: Peter Zijlstra (Intel) 
Cc: gno...@lxorguk.ukuu.org.uk
Cc: Rik van Riel 
Cc: Andi Kleen 
Cc: Josh Poimboeuf 
Cc: thomas.lenda...@amd.com
Cc: Linus Torvalds 
Cc: Jiri Kosina 
Cc: Andy Lutomirski 
Cc: Dave Hansen 
Cc: Kees Cook 
Cc: Tim Chen 
Cc: Greg Kroah-Hartman 
Link: 
https://lkml.kernel.org/r/CA+55aFzWgquv4i6Mab6bASqYXg3ErV3XDFEYf=geccdqg5u...@mail.gmail.com
---
 arch/x86/Makefile | 2 --
 1 file changed, 2 deletions(-)

diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 974c618..504b1a4 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -240,8 +240,6 @@ ifdef CONFIG_RETPOLINE
 RETPOLINE_CFLAGS += $(call cc-option,-mindirect-branch=thunk-extern 
-mindirect-branch-register)
 ifneq ($(RETPOLINE_CFLAGS),)
 KBUILD_CFLAGS += $(RETPOLINE_CFLAGS) -DRETPOLINE
-else
-$(warning CONFIG_RETPOLINE=y, but not supported by the compiler. 
Toolchain update recommended.)
 endif
 endif
 

[tip:x86/pti] x86/retpoline: Remove compile time warning

[tip-bot for Thomas Gleixner]

Commit-ID:  b8b9ce4b5aec8de9e23cabb0a26b78641f9ab1d6
Gitweb: https://git.kernel.org/tip/b8b9ce4b5aec8de9e23cabb0a26b78641f9ab1d6
Author: Thomas Gleixner 
AuthorDate: Sun, 14 Jan 2018 22:13:29 +0100
Committer:  Thomas Gleixner 
CommitDate: Sun, 14 Jan 2018 22:29:36 +0100

x86/retpoline: Remove compile time warning

Remove the compile time warning when CONFIG_RETPOLINE=y and the compiler
does not have retpoline support. Linus rationale for this is:

  It's wrong because it will just make people turn off RETPOLINE, and the
  asm updates - and return stack clearing - that are independent of the
  compiler are likely the most important parts because they are likely the
  ones easiest to target.

  And it's annoying because most people won't be able to do anything about
  it. The number of people building their own compiler? Very small. So if
  their distro hasn't got a compiler yet (and pretty much nobody does), the
  warning is just annoying crap.

  It is already properly reported as part of the sysfs interface. The
  compile-time warning only encourages bad things.

Fixes: 76b043848fd2 ("x86/retpoline: Add initial retpoline support")
Requested-by: Linus Torvalds 
Signed-off-by: Thomas Gleixner 
Cc: David Woodhouse 
Cc: Peter Zijlstra (Intel) 
Cc: gno...@lxorguk.ukuu.org.uk
Cc: Rik van Riel 
Cc: Andi Kleen 
Cc: Josh Poimboeuf 
Cc: thomas.lenda...@amd.com
Cc: Linus Torvalds 
Cc: Jiri Kosina 
Cc: Andy Lutomirski 
Cc: Dave Hansen 
Cc: Kees Cook 
Cc: Tim Chen 
Cc: Greg Kroah-Hartman 
Link: 
https://lkml.kernel.org/r/CA+55aFzWgquv4i6Mab6bASqYXg3ErV3XDFEYf=geccdqg5u...@mail.gmail.com
---
 arch/x86/Makefile | 2 --
 1 file changed, 2 deletions(-)

diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 974c618..504b1a4 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -240,8 +240,6 @@ ifdef CONFIG_RETPOLINE
 RETPOLINE_CFLAGS += $(call cc-option,-mindirect-branch=thunk-extern 
-mindirect-branch-register)
 ifneq ($(RETPOLINE_CFLAGS),)
 KBUILD_CFLAGS += $(RETPOLINE_CFLAGS) -DRETPOLINE
-else
-$(warning CONFIG_RETPOLINE=y, but not supported by the compiler. 
Toolchain update recommended.)
 endif
 endif