diff options
Diffstat (limited to 'debian/patches/bugfix/x86/x86-32-disable-3dnow-in-generic-config.patch')
| -rw-r--r-- | debian/patches/bugfix/x86/x86-32-disable-3dnow-in-generic-config.patch | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/debian/patches/bugfix/x86/x86-32-disable-3dnow-in-generic-config.patch b/debian/patches/bugfix/x86/x86-32-disable-3dnow-in-generic-config.patch new file mode 100644 index 000000000..2970dc8b4 --- /dev/null +++ b/debian/patches/bugfix/x86/x86-32-disable-3dnow-in-generic-config.patch @@ -0,0 +1,31 @@ +From: Ben Hutchings <ben@decadent.org.uk> +Date: Tue, 25 Sep 2018 19:44:13 +0100 +Subject: x86-32: Disable 3D-Now in generic config + +We want the 686 flavour to run on Geode LX and similar AMD family 5 +CPUs as well as family 6 and higher CPUs. This used to work with +CONFIG_M686=y. However commit 25d76ac88821 "x86/Kconfig: Explicitly +enumerate i686-class CPUs in Kconfig" in Linux 4.16 has made the +kernel require family 6 or higher. + +It looks like a sensible choice would be to enable CONFIG_MGEODE_LX +and CONFIG_X86_GENERIC (for more generic optimisations), but this +currently enables CONFIG_X86_USE_3D_NOW which will cause the kernel to +crash on CPUs without the AMD-specific 3D-Now instructions. + +Make CONFIG_X86_USE_3DNOW depend on CONFIG_X86_GENERIC being disabled. + +--- +Index: linux/arch/x86/Kconfig.cpu +=================================================================== +--- linux.orig/arch/x86/Kconfig.cpu ++++ linux/arch/x86/Kconfig.cpu +@@ -337,7 +337,7 @@ config X86_USE_PPRO_CHECKSUM + + config X86_USE_3DNOW + def_bool y +- depends on (MCYRIXIII || MK7 || MGEODE_LX) && !UML ++ depends on (MCYRIXIII || MK7 || MGEODE_LX) && !X86_GENERIC && !UML + + # + # P6_NOPs are a relatively minor optimization that require a family >= |