Re: Automatic merge failed, fix up by hand

[Junio C Hamano <junkio@cox.net>]

Len Brown <len.brown@intel.com> writes:

>> I could get to 81065e2f415af6... commit (Linus tip at this
>> moment), so if you can tell me where to snarf the other commit
>> (702c7e76....) that would help me diagnose the problem a lot.
>
> rsync://rsync.kernel.org/pub/scm/linux/kernel/git/lenb/to-akpm.git

Thanks.

I think merge-base, even though we attempted to fix it recently,
is still confused and that is one of the reasons why you are
getting this.

    prompt$  git-rev-parse origin test-lenb-merge
    81065e2f415af6c028eac13f481fb9e60a0b487b
    702c7e7626deeabb057b6f529167b65ec2eefbdb
    prompt$  git-merge-base origin test-lenb-merge
    30e332f3307e9f7718490a706e5ce99f0d3a7b26
    prompt$  git show-branch origin test-lenb-merge
    ! [origin] zd1201 kmalloc size fix
     * [test-lenb-merge] [ACPI] fix ia64 build issues resulting from L...
    --
    +  [origin] zd1201 kmalloc size fix
    +  [origin~1] md: make sure resync gets started when array starts.
    +  [origin~2] preempt race in getppid
    +  [origin~3] Merge master.kernel.org:/pub/scm/linux/kernel/git/da
    -- >8 -- snip -- >8 --
    +  Merge ../to-linus-stable/
    ++ [ACPI] re-enable platform-specific hotkey drivers by default
    +  ARM: 2851/1: Fix NWFPE extended precision exception handling
    ++ [origin~34] intelfb/fbdev: Save info->flags in a local variable
    prompt$  git-rev-parse origin~34
    3edea4833a1efcd43e1dff082bc8001fdfe74b34

Notice that show-branch, which walks the commit ancestry chain
pretty much the same way merge-base does, notices and stops at
origin~34 (that's 34th generation first parent commit from Linus
tip) that is the common commit between the two heads being
merged?  And that commit, 3edea48... is different from what
merge-base is reporting.

If I maually run merge-cache using origin~34 as the merge base,
only the following two files needs to result in non-simple merge:

    Documentation/acpi-hotkey.txt
    drivers/acpi/osl.c

Do these two files match your expectation?

I'll take a look at merge-base.c next, but just in case I CC:ed
this to Linus, who is more familiar with that code.