do_patch is currently doing checks with machine_srcrev without initiate
it which leads to below (additional debug added):

 DEBUG: Executing shell function do_patch
 .
 .
 .
 + [ 0 -ne 0 ]
 + [  != AUTOINC ]
 + git rev-parse --verify ~0
 fatal: Needed a single revision
 + git merge-base HEAD
 usage: git merge-base [-a|--all] <commit> <commit>...
    or: git merge-base [-a|--all] --octopus <commit>...
    or: git merge-base --independent <commit>...
    or: git merge-base --is-ancestor <commit> <commit>
    or: git merge-base --fork-point <ref> [<commit>]

     -a, --all             output all common ancestors
     --octopus             find ancestors for a single n-way merge
     --independent         list revs not reachable from others
     --is-ancestor         is the first one ancestor of the other?
     --fork-point          find where <commit> forked from reflog of <ref>

 + [  =  ]
 + set +x
 DEBUG: Shell function do_patch finished

Only reason it works today is because 'rev-parse/merge-base' with empty 
machine_srcrev
will result in "false positive". Solve this by adding a similar non-empty check 
and
use SRCREV as fallback as in 'do_kernel_metadata'

Signed-off-by: Petter Mabäcker <[email protected]>
---
 meta/classes/kernel-yocto.bbclass | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/meta/classes/kernel-yocto.bbclass 
b/meta/classes/kernel-yocto.bbclass
index 6fd025e..fb14926 100644
--- a/meta/classes/kernel-yocto.bbclass
+++ b/meta/classes/kernel-yocto.bbclass
@@ -168,6 +168,16 @@ do_patch() {
 
        # check to see if the specified SRCREV is reachable from the final 
branch.
        # if it wasn't something wrong has happened, and we should error.
+       machine_srcrev="${SRCREV_machine}"
+       if [ -z "${machine_srcrev}" ]; then
+               # fallback to SRCREV if a non machine_meta tree is being built
+               machine_srcrev="${SRCREV}"
+               # if SRCREV cannot be reached something is wrong.
+               if [ -z "${machine_srcrev}" ]; then
+                       bbfatal "Neither SRCREV_machine or SRCREV was 
specified!"
+               fi
+       fi
+
        if [ "${machine_srcrev}" != "AUTOINC" ]; then
                if ! [ "$(git rev-parse --verify ${machine_srcrev}~0)" = "$(git 
merge-base ${machine_srcrev} HEAD)" ]; then
                        bberror "SRCREV ${machine_srcrev} was specified, but is 
not reachable"
-- 
1.9.1

-- 
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