diff options
Diffstat (limited to 'common/recipes-kernel/linux/linux-yocto-4.9.21/0076-x86-retpoline-Remove-compile-time-warning.patch')
| -rw-r--r-- | common/recipes-kernel/linux/linux-yocto-4.9.21/0076-x86-retpoline-Remove-compile-time-warning.patch | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.9.21/0076-x86-retpoline-Remove-compile-time-warning.patch b/common/recipes-kernel/linux/linux-yocto-4.9.21/0076-x86-retpoline-Remove-compile-time-warning.patch new file mode 100644 index 00000000..31eeb054 --- /dev/null +++ b/common/recipes-kernel/linux/linux-yocto-4.9.21/0076-x86-retpoline-Remove-compile-time-warning.patch @@ -0,0 +1,62 @@ +From 0f71f50c7d1e47adced3237b77f0edcd25b92c0c Mon Sep 17 00:00:00 2001 +From: Thomas Gleixner <tglx@linutronix.de> +Date: Sun, 14 Jan 2018 22:13:29 +0100 +Subject: [PATCH 076/103] x86/retpoline: Remove compile time warning + +commit b8b9ce4b5aec8de9e23cabb0a26b78641f9ab1d6 upstream. + +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 <torvalds@linux-foundation.org> +Signed-off-by: Thomas Gleixner <tglx@linutronix.de> +Cc: David Woodhouse <dwmw@amazon.co.uk> +Cc: Peter Zijlstra (Intel) <peterz@infradead.org> +Cc: gnomes@lxorguk.ukuu.org.uk +Cc: Rik van Riel <riel@redhat.com> +Cc: Andi Kleen <ak@linux.intel.com> +Cc: Josh Poimboeuf <jpoimboe@redhat.com> +Cc: thomas.lendacky@amd.com +Cc: Linus Torvalds <torvalds@linux-foundation.org> +Cc: Jiri Kosina <jikos@kernel.org> +Cc: Andy Lutomirski <luto@amacapital.net> +Cc: Dave Hansen <dave.hansen@intel.com> +Cc: Kees Cook <keescook@google.com> +Cc: Tim Chen <tim.c.chen@linux.intel.com> +Cc: Greg Kroah-Hartman <gregkh@linux-foundation.org> +Link: https://lkml.kernel.org/r/CA+55aFzWgquv4i6Mab6bASqYXg3ErV3XDFEYf=GEcCDQg5uAtw@mail.gmail.com +Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> +--- + arch/x86/Makefile | 2 -- + 1 file changed, 2 deletions(-) + +diff --git a/arch/x86/Makefile b/arch/x86/Makefile +index 1e1a733..cd22cb8 100644 +--- a/arch/x86/Makefile ++++ b/arch/x86/Makefile +@@ -187,8 +187,6 @@ 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 + +-- +2.7.4 + |