[gentoo-dev] [PATCH v2] Transitional changes to the kernel-2 eclass to support future CPU OPT

From: Mike Pagano <mpagano@g.o>

Thanks, Ulm, for the review. I have modified the code as suggested.

The CPU OPT patch now contains gcc ver checks within
the patch itself. This transitional change is to start supporting
just that patch while trying not to break the older versions.

The target state eclass code will *only* need the three line
gcc version check.  We should be able to slowly remove the
legacy code as we stabilize kernels and remove old ones from the tree.

This will put cpu opt patch support in a much more maintainable state.


Signed-off-by: Mike Pagano <mpagano@g.o>
---
 eclass/kernel-2.eclass | 29 +++++++++++++++++++++++++++--
 1 file changed, 27 insertions(+), 2 deletions(-)

diff --git a/eclass/kernel-2.eclass b/eclass/kernel-2.eclass
index 67ad4acc1..f1f23f6a0 100644
--- a/eclass/kernel-2.eclass
+++ b/eclass/kernel-2.eclass
@@ -1241,8 +1241,32 @@ unipatch() {
 			local GCC_MAJOR_VER=$(gcc-major-version)
 			local GCC_MINOR_VER=$(gcc-minor-version)
 
-			# optimization patch for gcc < 8.X and kernel > 4.13
-			if kernel_is ge 4 13 ; then 
+			# this section should be the target state to handle the cpu opt
+			# patch for kernels > 4.19.189, 5.4.115, 5.10.33 and 5.11.17,
+			# 5.12.0 and gcc >= 9  The patch now handles the
+			# gcc version enabled on the system through the Kconfig file as
+			# 'depends'. The legacy section can hopefully be retired in the future
+			# Note the patch for 4.19-5.8 version are the same and the patch for 
+			# 5.8+ version is the same
+			# eventually we can remove everything except the gcc ver <9 check
+			# based on stablization, time, kernel removals or a combo of all three
+			if ( kernel_is eq 4 19 && kernel_is gt 4 19 189 ) ||
+				( kernel_is eq 5 4 && kernel_is gt 5 4 115 ) ||
+				( kernel_is eq 5 10 && kernel_is gt 5 10 33 ) ||
+				( kernel_is eq 5 11 && kernel_is gt 5 11 17 ) ||
+				( kernel_is eq 5 12 && kernel_is gt 5 12 0 ); then
+				UNIPATCH_DROP+=" 5010_enable-additional-cpu-optimizations-for-gcc.patch"
+				UNIPATCH_DROP+=" 5010_enable-additional-cpu-optimizations-for-gcc-4.9.patch"
+				UNIPATCH_DROP+=" 5011_enable-cpu-optimizations-for-gcc8.patch"
+				UNIPATCH_DROP+=" 5012_enable-cpu-optimizations-for-gcc91.patch"
+				UNIPATCH_DROP+=" 5013_enable-cpu-optimizations-for-gcc10.patch"
+				if [[ ${GCC_MAJOR_VER} -lt 9 ]]; then
+					UNIPATCH_DROP+=" 5010_enable-cpu-optimizations-universal.patch"
+				fi
+				# this legacy section should be targeted for removal
+				# optimization patch for gcc < 8.X and kernel > 4.13 and <  4.19
+			elif kernel_is ge 4 13; then
+				UNIPATCH_DROP+=" 5010_enable-cpu-optimizations-universal.patch"
 				if [[ ${GCC_MAJOR_VER} -lt 8 ]] && [[ ${GCC_MAJOR_VER} -gt 4 ]]; then
 					UNIPATCH_DROP+=" 5011_enable-cpu-optimizations-for-gcc8.patch"
 					UNIPATCH_DROP+=" 5012_enable-cpu-optimizations-for-gcc91.patch"
@@ -1272,6 +1296,7 @@ unipatch() {
 					UNIPATCH_DROP+=" 5013_enable-cpu-optimizations-for-gcc10.patch"
 				fi
 			else
+				UNIPATCH_DROP+=" 5010_enable-cpu-optimizations-universal.patch"
 				UNIPATCH_DROP+=" 5010_enable-additional-cpu-optimizations-for-gcc.patch"
 				UNIPATCH_DROP+=" 5010_enable-additional-cpu-optimizations-for-gcc-4.9.patch"
 				UNIPATCH_DROP+=" 5011_enable-cpu-optimizations-for-gcc8.patch"
-- 
2.26.3