From: Daniel Borkmann daniel@iogearbox.net
commit a9d57ef15cbe327fe54416dd194ee0ea66ae53a4 upstream.
Commit ce02ef06fcf7 ("x86, retpolines: Raise limit for generating indirect calls from switch-case") raised the limit under retpolines to 20 switch cases where gcc would only then start to emit jump tables, and therefore effectively disabling the emission of slow indirect calls in this area.
After this has been brought to attention to gcc folks [0], Martin Liska has then fixed gcc to align with clang by avoiding to generate switch jump tables entirely under retpolines. This is taking effect in gcc starting from stable version 8.4.0. Given kernel supports compilation with older versions of gcc where the fix is not being available or backported anymore, we need to keep the extra KBUILD_CFLAGS around for some time and generally set the -fno-jump-tables to align with what more recent gcc is doing automatically today.
More than 20 switch cases are not expected to be fast-path critical, but it would still be good to align with gcc behavior for versions < 8.4.0 in order to have consistency across supported gcc versions. vmlinux size is slightly growing by 0.27% for older gcc. This flag is only set to work around affected gcc, no change for clang.
[0] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86952
Suggested-by: Martin Liska mliska@suse.cz Signed-off-by: Daniel Borkmann daniel@iogearbox.net Signed-off-by: Thomas Gleixner tglx@linutronix.de Cc: David Woodhouse dwmw2@infradead.org Cc: Linus Torvalds torvalds@linux-foundation.org Cc: Jesper Dangaard Brouer brouer@redhat.com Cc: Björn Töpelbjorn.topel@intel.com Cc: Magnus Karlsson magnus.karlsson@intel.com Cc: Alexei Starovoitov ast@kernel.org Cc: H.J. Lu hjl.tools@gmail.com Cc: Alexei Starovoitov ast@kernel.org Cc: David S. Miller davem@davemloft.net Link: https://lkml.kernel.org/r/20190325135620.14882-1-daniel@iogearbox.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/x86/Makefile | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
--- a/arch/x86/Makefile +++ b/arch/x86/Makefile @@ -220,8 +220,12 @@ ifdef CONFIG_RETPOLINE # Additionally, avoid generating expensive indirect jumps which # are subject to retpolines for small number of switch cases. # clang turns off jump table generation by default when under - # retpoline builds, however, gcc does not for x86. - KBUILD_CFLAGS += $(call cc-option,--param=case-values-threshold=20) + # retpoline builds, however, gcc does not for x86. This has + # only been fixed starting from gcc stable version 8.4.0 and + # onwards, but not for older ones. See gcc bug #86952. + ifndef CONFIG_CC_IS_CLANG + KBUILD_CFLAGS += $(call cc-option,-fno-jump-tables) + endif endif
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