The kernel Makefile look for localversion in the source tree,
not the object tree. The absense from the source tree results
in a patch module that will not load because the kernel versions
don't match.
Signed-off-by: Seth Jennings <sjenning@redhat.com>
Setting KCFLAGS="-ffunction-sections -fdata-sections" causes make to
invalidate all the kernel objects, resulting in all the objects getting
rebuilt on the next pass, thus no build caching.
To fix that, build the objects in a separate directory (obj) for normal
builds, and another separate directory (obj2) for the builds with added
cflags.
The compression of the cache during initial build time and
the removal and (re)decompression of the cache for subsequent
builds takes a large amount of time and causes significant I/O.
This commit removes the compressed cache and, instead, keeps
the cache uncompressed and maintained in a known state. If
the "applied-patch" file does not exist, then the cache is
in the unpatched state. If the file does exist, the cache is
in a patched state and can be returned to an unpatched state
with "patch -R -p1 < applied-patch".
The if cache is detected and is in the patched state, the patch
is removed and vmlinux is rebuilt to obtain the base vmlinux.
Signed-off-by: Seth Jennings <sjenning@redhat.com>
Right now kpatch-build fails when more than one object
file has changed because the quotes around the for loop
arrays cause the for loop to execute only once for all
elements in a single string.
Remove the quotes around the for loop arrays so that the
for loop is execute for each element.
Signed-off-by: Seth Jennings <sjenning@redhat.com>
- move license to bottom
- clarify dependencies and installation procedure
- move gotchas section to installation section
- move status section to intro
- add more information about how it works
When calling kpatch-build from the git directory, the patch kmod build
fails because it can't find kpatch.h because the symlink is broken.
Copy the kpatch.h file (instead of the symlink) to TEMPDIR.
bash gets confused when a command and its args are quoted:
/usr/local/libexec/kpatch/kpatch-build: line 131: strip -d --keep-file-symbols: command not found
Build and install the kpatch core module with make and make install,
rather than building it every time with kpatch build.
The only downside to this approach is that the user has to make and make
install kpatch every time they get a new kernel. But this is only
temporary, until the kpatch module is delivered in an RPM.
