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commit: d4662d3ac3d6470f051a0923b24deeced928878a |
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Author: Mike Pagano <mpagano <AT> gentoo <DOT> org> |
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AuthorDate: Mon Jun 29 17:31:54 2020 +0000 |
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Commit: Mike Pagano <mpagano <AT> gentoo <DOT> org> |
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CommitDate: Mon Jun 29 17:31:54 2020 +0000 |
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URL: https://gitweb.gentoo.org/proj/linux-patches.git/commit/?id=d4662d3a |
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|
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Update CPU optimization patch for gcc 9.1+ |
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|
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Signed-off-by: Mike Pagano <mpagano <AT> gentoo.org> |
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|
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5012_enable-cpu-optimizations-for-gcc91.patch | 51 ++++++++++++++++----------- |
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1 file changed, 30 insertions(+), 21 deletions(-) |
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|
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diff --git a/5012_enable-cpu-optimizations-for-gcc91.patch b/5012_enable-cpu-optimizations-for-gcc91.patch |
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index 049ec12..2f16153 100644 |
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--- a/5012_enable-cpu-optimizations-for-gcc91.patch |
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+++ b/5012_enable-cpu-optimizations-for-gcc91.patch |
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@@ -42,14 +42,18 @@ It also offers to compile passing the 'native' option which, "selects the CPU |
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to generate code for at compilation time by determining the processor type of |
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the compiling machine. Using -march=native enables all instruction subsets |
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supported by the local machine and will produce code optimized for the local |
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-machine under the constraints of the selected instruction set."[3] |
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+machine under the constraints of the selected instruction set."[2] |
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+ |
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+Do NOT try using the 'native' option on AMD Piledriver, Steamroller, or |
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+Excavator CPUs (-march=bdver{2,3,4} flag). The build will error out due the |
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+kernel's objtool issue with these.[3a,b] |
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|
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MINOR NOTES |
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This patch also changes 'atom' to 'bonnell' in accordance with the gcc v4.9 |
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changes. Note that upstream is using the deprecated 'match=atom' flags when I |
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-believe it should use the newer 'march=bonnell' flag for atom processors.[2] |
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+believe it should use the newer 'march=bonnell' flag for atom processors.[4] |
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|
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-It is not recommended to compile on Atom-CPUs with the 'native' option.[4] The |
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+It is not recommended to compile on Atom-CPUs with the 'native' option.[5] The |
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recommendation is to use the 'atom' option instead. |
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|
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BENEFITS |
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@@ -61,21 +65,23 @@ https://github.com/graysky2/kernel_gcc_patch |
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|
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REQUIREMENTS |
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linux version >=5.7 |
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-gcc version >=9.1 |
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+gcc version >=9.1 and <10 |
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|
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ACKNOWLEDGMENTS |
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-This patch builds on the seminal work by Jeroen.[5] |
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+This patch builds on the seminal work by Jeroen.[6] |
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|
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REFERENCES |
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-1. https://gcc.gnu.org/gcc-4.9/changes.html |
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-2. https://bugzilla.kernel.org/show_bug.cgi?id=77461 |
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-3. https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html |
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-4. https://github.com/graysky2/kernel_gcc_patch/issues/15 |
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-5. http://www.linuxforge.net/docs/linux/linux-gcc.php |
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+1. https://gcc.gnu.org/gcc-4.9/changes.html |
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+2. https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html |
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+3a. https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95671#c11 |
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+3b. https://github.com/graysky2/kernel_gcc_patch/issues/55 |
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+4. https://bugzilla.kernel.org/show_bug.cgi?id=77461 |
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+5. https://github.com/graysky2/kernel_gcc_patch/issues/15 |
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+6. http://www.linuxforge.net/docs/linux/linux-gcc.php |
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|
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---- a/arch/x86/include/asm/vermagic.h 2019-12-15 18:16:08.000000000 -0500 |
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-+++ b/arch/x86/include/asm/vermagic.h 2019-12-17 14:03:55.968871551 -0500 |
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-@@ -27,6 +27,36 @@ struct mod_arch_specific { |
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+--- a/arch/x86/include/asm/vermagic.h 2020-06-10 14:21:45.000000000 -0400 |
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++++ b/arch/x86/include/asm/vermagic.h 2020-06-15 10:44:10.437477053 -0400 |
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+@@ -17,6 +17,36 @@ |
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#define MODULE_PROC_FAMILY "586MMX " |
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#elif defined CONFIG_MCORE2 |
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#define MODULE_PROC_FAMILY "CORE2 " |
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@@ -112,7 +118,7 @@ REFERENCES |
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#elif defined CONFIG_MATOM |
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#define MODULE_PROC_FAMILY "ATOM " |
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#elif defined CONFIG_M686 |
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-@@ -45,6 +75,28 @@ struct mod_arch_specific { |
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+@@ -35,6 +65,28 @@ |
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#define MODULE_PROC_FAMILY "K7 " |
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#elif defined CONFIG_MK8 |
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#define MODULE_PROC_FAMILY "K8 " |
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@@ -141,8 +147,8 @@ REFERENCES |
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#elif defined CONFIG_MELAN |
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#define MODULE_PROC_FAMILY "ELAN " |
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#elif defined CONFIG_MCRUSOE |
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---- a/arch/x86/Kconfig.cpu 2019-12-15 18:16:08.000000000 -0500 |
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-+++ b/arch/x86/Kconfig.cpu 2019-12-17 14:09:03.805642284 -0500 |
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+--- a/arch/x86/Kconfig.cpu 2020-06-10 14:21:45.000000000 -0400 |
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++++ b/arch/x86/Kconfig.cpu 2020-06-15 10:44:10.437477053 -0400 |
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@@ -123,6 +123,7 @@ config MPENTIUMM |
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config MPENTIUM4 |
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bool "Pentium-4/Celeron(P4-based)/Pentium-4 M/older Xeon" |
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@@ -524,9 +530,9 @@ REFERENCES |
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|
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config X86_MINIMUM_CPU_FAMILY |
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int |
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---- a/arch/x86/Makefile 2019-12-15 18:16:08.000000000 -0500 |
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-+++ b/arch/x86/Makefile 2019-12-17 14:03:55.972204960 -0500 |
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-@@ -119,13 +119,53 @@ else |
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+--- a/arch/x86/Makefile 2020-06-10 14:21:45.000000000 -0400 |
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++++ b/arch/x86/Makefile 2020-06-15 10:44:35.608035680 -0400 |
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+@@ -119,13 +119,56 @@ else |
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KBUILD_CFLAGS += $(call cc-option,-mskip-rax-setup) |
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|
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# FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu) |
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@@ -539,8 +545,11 @@ REFERENCES |
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+ cflags-$(CONFIG_MJAGUAR) += $(call cc-option,-march=btver2) |
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+ cflags-$(CONFIG_MBULLDOZER) += $(call cc-option,-march=bdver1) |
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+ cflags-$(CONFIG_MPILEDRIVER) += $(call cc-option,-march=bdver2) |
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++ cflags-$(CONFIG_MPILEDRIVER) += $(call cc-option,-mno-tbm) |
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+ cflags-$(CONFIG_MSTEAMROLLER) += $(call cc-option,-march=bdver3) |
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++ cflags-$(CONFIG_MSTEAMROLLER) += $(call cc-option,-mno-tbm) |
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+ cflags-$(CONFIG_MEXCAVATOR) += $(call cc-option,-march=bdver4) |
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++ cflags-$(CONFIG_MEXCAVATOR) += $(call cc-option,-mno-tbm) |
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+ cflags-$(CONFIG_MZEN) += $(call cc-option,-march=znver1) |
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+ cflags-$(CONFIG_MZEN2) += $(call cc-option,-march=znver2) |
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cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona) |
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@@ -583,8 +592,8 @@ REFERENCES |
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cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic) |
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KBUILD_CFLAGS += $(cflags-y) |
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|
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---- a/arch/x86/Makefile_32.cpu 2019-12-15 18:16:08.000000000 -0500 |
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-+++ b/arch/x86/Makefile_32.cpu 2019-12-17 14:03:55.972204960 -0500 |
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+--- a/arch/x86/Makefile_32.cpu 2020-06-10 14:21:45.000000000 -0400 |
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++++ b/arch/x86/Makefile_32.cpu 2020-06-15 10:44:10.437477053 -0400 |
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@@ -24,7 +24,19 @@ cflags-$(CONFIG_MK6) += -march=k6 |
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# Please note, that patches that add -march=athlon-xp and friends are pointless. |
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# They make zero difference whatsosever to performance at this time. |
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