Merge branch 'master' of github.com:cirosantilli/linux-kernel-module-cheat

README.adoc

@@ -2527,7 +2527,7 @@ and `%pB` is documented at `Documentation/core-api/printk-formats.rst`:
 If KALLSYMS are disabled then the symbol address is printed instead.
 ....
 
-I wasn't able do disable `CONFIG_KALLSYMS` to test this this out however, it is being selected by some other option TODO which? How to find that out?
+I wasn't able do disable `CONFIG_KALLSYMS` to test this this out however, it is being selected by some other option? But I then used `make menuconfig` to see which options select it, and they were all off...
 
 [[oops]]
 ==== Kernel oops
@@ -2984,7 +2984,7 @@ I once got link:https://en.wikipedia.org/wiki/User-mode_Linux[UML] running on a
 
 But in part because it is dying, I didn't spend much effort to integrate it into this repo, although it would be a good fit in principle, since it is essentially a virtualization method.
 
-Maybe some brave should will send a pull request one day.
+Maybe some brave soul will send a pull request one day.
 
 === Linux kernel interactive stuff
 
@@ -4212,7 +4212,7 @@ Header only linear algebra library supported by Buildroot:
 
 ....
 ./build -B 'BR2_PACKAGE_EIGEN=y' -k
-./run -F '/eigen.out'
+./run -F '/eigen.out;/eigen_svd.out'
 ....
 
 ===== PARSEC benchmark
@@ -5054,6 +5054,8 @@ so which shows that the whole delay is inside our install itself.
 
 I put an `echo f` in `check_bin_arch`, and it just loops forever, does not stop on a particular package.
 
+Ignored / declined patch at: http://lists.busybox.net/pipermail/buildroot/2018-May/220662.html I might just fork Buildroot on the submodule if this keeps annoying me.
+
 === Report upstream bugs
 
 When asking for help on upstream repositories outside of this repository, you will need to provide the commands that you are running in detail without referencing our scripts.

kernel_module/user/Makefile

@@ -15,6 +15,7 @@ endif
 ifeq ($(BR2_PACKAGE_EIGEN),y)
 	# Header only.
 	#LIBS += -leigen
+	CXXFLAGS_EXTRA += $(shell $(PKG_CONFIG) --cflags --libs eigen3)
 else
 	OUTS := $(filter-out eigen%$(OUT_EXT),$(OUTS))
 endif

kernel_module/user/README.adoc

@@ -11,8 +11,6 @@ These programs can also be compiled and used on host.
 . Standalone
 .. link:hello.c[]
 .. link:hello_cpp.cpp[]
-.. link:myinsmod.c[]
-.. link:myrmmod.c[]
 .. link:sched_getaffinity.c[]
 .. link:usermem.c[]
 ... link:pagemap_dump.c[]
@@ -30,7 +28,3 @@ These programs can also be compiled and used on host.
 .. link:ioctl.c[]
 .. link:netlink.c[]
 .. link:poll.c[]
-. Buildroot libraries
-.. link:eigen.cpp[]
-.. link:openmp.c[]
-.. link:openblas.c[]

kernel_module/user/eigen.cpp

@@ -1,14 +1,11 @@
-/* Official hello world. */
-
+/* Adapted from: https://eigen.tuxfamily.org/dox/GettingStarted.html */
 #include <iostream>
-#include <eigen3/Eigen/Dense>
-using Eigen::MatrixXd;
-int main()
-{
-  MatrixXd m(2,2);
-  m(0,0) = 3;
-  m(1,0) = 2.5;
-  m(0,1) = -1;
-  m(1,1) = m(1,0) + m(0,1);
-  std::cout << m << std::endl;
+#include <Eigen/Dense>
+int main() {
+	Eigen::MatrixXd m(2,2);
+	m(0,0) = 3;
+	m(1,0) = 2.5;
+	m(0,1) = -1;
+	m(1,1) = m(1,0) + m(0,1);
+	std::cout << m << std::endl;
 }

kernel_module/user/eigen_svd.cpp

@@ -0,0 +1,24 @@
+/* Adapted from: https://eigen.tuxfamily.org/dox/classEigen_1_1JacobiSVD.html */
+
+#include <iostream>
+using std::cout;
+using std::endl;
+
+#include <Eigen/Core>
+#include <Eigen/SVD>
+using Eigen::ComputeThinU;
+using Eigen::ComputeThinV;
+using Eigen::JacobiSVD;
+using Eigen::MatrixXf;
+using Eigen::Vector3f;
+
+int main() {
+	MatrixXf m = MatrixXf::Random(3,2);
+	JacobiSVD<MatrixXf> svd(m, ComputeThinU | ComputeThinV);
+	Vector3f rhs(1, 0, 0);
+	cout << "m = " << endl << m << endl << endl;
+	cout << "svd.singularValues() = " << endl << svd.singularValues() << endl << endl;
+	cout << "svd.MatrixU() = " << endl << svd.matrixU() << endl << endl;
+	cout << "svd.MatrixV() = " << endl << svd.matrixV() << endl << endl;
+	cout << "svd.solve() = " << endl << svd.solve(rhs) << endl << endl;
+}