RFR (L, tedious again, sorry) 8189610: Reconcile jvm.h and all jvm_md.h between java.base and hotspot

David Holmes david.holmes at oracle.com
Sat Oct 28 07:50:27 UTC 2017


Hi Coleen,

I've commented on the file location in response to Mandy's email.

The only issue I'm still concerned about is the JVM_MAXPATHLEN issue. I 
think it is a bug to define a JVM_MAXPATHLEN that is bigger than the 
platform MAXPATHLEN. I also would not want to see any change in 
behaviour because of this - so AIX and Solaris should not get a 
different JVM_MAXPATHLEN due to this refactoring change. So yes I think 
this needs to be ifdef'd for Linux and reluctantly (because it was a 
copy error) for OSX/BSD as well.

Thanks,
David

On 28/10/2017 12:08 AM, coleen.phillimore at oracle.com wrote:
> 
> 
> On 10/27/17 9:37 AM, David Holmes wrote:
>> On 27/10/2017 10:13 PM, coleen.phillimore at oracle.com wrote:
>>>
>>>
>>> On 10/27/17 3:23 AM, David Holmes wrote:
>>>> Hi Coleen,
>>>>
>>>> Thanks for tackling this.
>>>>
>>>>> Summary: removed hotspot version of jvm*h and jni*h files
>>>>
>>>> Can you update the bug synopsis to show it covers both sets of files 
>>>> please.
>>>>
>>>> I hate to start with this (and it took me quite a while to realize 
>>>> it) but as Mandy pointed out jvm.h is not an exported interface from 
>>>> the JDK to the outside world (so not subject to CSR review), but is 
>>>> a private interface between the JVM and the JDK libraries. So I 
>>>> think really jvm.h belongs in the hotspot sources where it was, 
>>>> while jni.h belongs in the exported JDK sources. In which case the 
>>>> bulk of your changes to the hotspot files would not be needed - sorry.
>>>
>>> Maybe someone can make that decision and change at a later date. The 
>>> point of this change is that there is now only one of these files 
>>> that is shared.  I don't think jvm.h and the jvm_md.h belong on the 
>>> hotspot sources for the jdk to find them in some random prims and os 
>>> dependent directories.
>>
>> The one file that is needed is a hotspot file - jvm.h defines the 
>> interface that hotspot exports via jvm.cpp.
>>
>> If you leave jvm.h in hotspot/prims then a very large chunk of your 
>> boilerplate changes are not needed. The JDK code doesn't care what the 
>> name of the directory is - whatever it is just gets added as a -I 
>> directive (the JDK code will include "jvm.h" not "prims/jvm.h" the way 
>> hotspot sources do.
>>
>> This isn't something we want to change back or move again later. 
>> Whatever we do now we live with.
> 
> I think it belongs with jni.h and I think the core libraries group would 
> agree.   It seems more natural there than buried in the hotspot prims 
> directory.  I guess this is on hold while we have this debate.   Sigh.
> 
> Actually with -I directives, changing to jvm.h from prims/jvm.h would 
> still work.   Maybe we should change the name to jvm.hpp since it's 
> jvm.cpp though?   Or maybe just have two divergent copies and close this 
> as WNF.
> 
>>
>>> I'm happy to withdraw the CSR.  We generally use the CSR process to 
>>> add and remove JVM_ interfaces even though they're a private 
>>> interface in case some other JVM/JDK combination relies on them. The 
>>> changes to these files are very minor though and not likely to cause 
>>> any even theoretical incompatibility, so I'll withdraw it.
>>>>
>>>> Moving on ...
>>>>
>>>> First to address the initial comments/query you had:
>>>>
>>>>> The JDK windows jni_md.h file defined jint as long and the hotspot
>>>>> windows jni_x86.h as int. I had to choose the jdk version since 
>>>>> it's the
>>>>> public version, so there are changes to the hotspot files for this.
>>>>
>>>> On Windows int and long are always the same as it uses ILP32 or 
>>>> LLP64 (not LP64 like *nix platforms). So either choice should be 
>>>> fine. That said there are some odd casting issues I comment on 
>>>> below. Does the VS compiler complain about mixing int and long in 
>>>> expressions?
>>>
>>> Yes, it does even though int and long are the same representation.
>>
>> And what an absolute mess that makes. :(
>>
>>>>
>>>>> Generally I changed the code to use 'int' rather than 'jint' where the
>>>>> surrounding API didn't insist on consistently using java types. We
>>>>> should mostly be using C++ types within hotspot except in 
>>>>> interfaces to
>>>>> native/JNI code.
>>>>
>>>> I think you pulled too hard on a few threads here and things are 
>>>> starting to unravel. There are numerous cases I refer to below where 
>>>> either the cast seems unnecessary/inappropriate or else highlights a 
>>>> bunch of additional changes that also need to be made. The fan out 
>>>> from this could be horrendous. Unless you actually get some kind of 
>>>> error - and I'd like to understand the details of those - I would 
>>>> not suggest making these changes as part of this work.
>>>
>>> I didn't make any change unless there was was an error.  I have 100 
>>> failed JPRT jobs to confirm!  I eventually got a Windows system to 
>>> compile and test this on.   Actually some of the changes came out 
>>> better.  Cases where we use jint as a bool simply turned to int.  We 
>>> do not have an overload for bool for cmpxchg.
>>
>> That's unfortunate - ditto for OrderAccess.
>>
>>>>
>>>> Looking through I have a quite a few queries/comments - apologies in 
>>>> advance as I know how tedious this is:
>>>>
>>>> make/hotspot/lib/CompileLibjsig.gmk
>>>> src/java.base/solaris/native/libjsig/jsig.c
>>>>
>>>> Took a while to figure out why the include was needed. :) As a 
>>>> follow up I suggest just deleting the -I include directive, delete 
>>>> the Solaris-only definition of JSIG_VERSION_1_4_1, and delete 
>>>> everything to do with JVM_get_libjsig_version. It is all obsolete.
>>>
>>> Can I patch up jsig in a separate RFE?  I don't remember why this 
>>> broke so I simply moved JSIG #define.  Is jsig obsolete? Removing 
>>> JVM_* definitions generally requires a CSR.
>>
>> I did say "As a follow up". jsig is not obsolete but the jsig 
>> versioning code, only used by Solaris, is.
>>
>>>>
>>>> ---
>>>>
>>>> src/hotspot/cpu/arm/interp_masm_arm.cpp
>>>>
>>>> Why did you need to add the jvm.h include?
>>>>
>>>
>>>    tbz(Raccess_flags, JVM_ACC_SYNCHRONIZED_BIT, unlocked);
>>
>> Okay. I'm not going to try and figure out how this code found this 
>> before.
>>
>>>> ---
>>>>
>>>> src/hotspot/os/windows/os_windows.cpp.
>>>>
>>>> The type of process_exiting should be uint to match the DWORD of 
>>>> GetCurrentThreadID. Then you should need any casts. Also you missed 
>>>> this jint cast:
>>>>
>>>> 3796         process_exiting != (jint)GetCurrentThreadId()) {
>>>
>>> Yes, that's better to change process_exiting to a DWORD.  It needs a 
>>> DWORD cast to 0 in the cmpxchg.
>>>
>>>          Atomic::cmpxchg(GetCurrentThreadId(), &process_exiting, 
>>> (DWORD)0);
>>>
>>> These templates are picky.
>>
>> Yes - their inability to deal with literals is extremely frustrating.
>>
>>>>
>>>> ---
>>>>
>>>> src/hotspot/share/c1/c1_Canonicalizer.hpp
>>>>
>>>>   43 #ifdef _WINDOWS
>>>>   44   // jint is defined as long in jni_md.h, so convert from int 
>>>> to jint
>>>>   45   void set_constant(int x)                       { 
>>>> set_constant((jint)x); }
>>>>   46 #endif
>>>>
>>>> Why is this necessary? int and long are the same on Windows. The 
>>>> whole point is that jint hides the underlying type, so where does 
>>>> this go wrong?
>>>
>>> No, they are not the same types even though they have the same 
>>> representation!
>>
>> This is truly unfortunate.
>>
>>>>
>>>> ---
>>>>
>>>> src/hotspot/share/c1/c1_LinearScan.cpp
>>>>
>>>>  ConstantIntValue((jint)0);
>>>>
>>>> why is this cast needed? what causes the ambiguity? (If this was a 
>>>> template I'd understand ;-) ). Also didn't you change that 
>>>> constructor to take an int anyway - not that I think it should - see 
>>>> below.
>>>
>>> Yes, it caused an ambiguity.  0 matches 'int' but it doesn't match 
>>> 'long' better than any pointer type.  So this cast is needed.
>>
>> But you changed the constructor to take an int!
>>
>>  class ConstantIntValue: public ScopeValue {
>>   private:
>> -  jint _value;
>> +  int _value;
>>   public:
>> -  ConstantIntValue(jint value)         { _value = value; }
>> +  ConstantIntValue(int value)          { _value = value; }
>>
>>
> 
> Okay I removed this cast.
> 
>>>> ---
>>>>
>>>> src/hotspot/share/ci/ciReplay.cpp
>>>>
>>>> 793         jint* dims = NEW_RESOURCE_ARRAY(jint, rank);
>>>>
>>>> why should this be jint?
>>>
>>> To avoid a cast from int* to jint* in the line below:
>>>
>>>           value = kelem->multi_allocate(rank, dims, CHECK);
>>>
>>>
>>>>
>>>> ---
>>>>
>>>> src/hotspot/share/classfile/altHashing.cpp
>>>>
>>>> Okay this looks more consistent with jint.
>>>
>>> Yes.  I translated this from some native code iirc.
>>>>
>>>> ---
>>>>
>>>> src/hotspot/share/code/debugInfo.hpp
>>>>
>>>> These changes seem wrong. We have:
>>>>
>>>> ConstantLongValue(jlong value)
>>>> ConstantDoubleValue(jdouble value)
>>>>
>>>> so we should have:
>>>>
>>>> ConstantIntValue(jint value)
>>>
>>> Again, there are multiple call sites with '0', which match int 
>>> trivially but are confused with long.  It's less consistent I agree 
>>> but better to not cast all the call sites.
>>
>> This is really making a mess of the APIs - they should be a jint but 
>> we declare them int because of a 0 casting problem. Can't we just use 0L?
> 
> There aren't that many casts.  You're right, that would have been better 
> in some places.
> 
>>>>
>>>> ---
>>>>
>>>> src/hotspot/share/code/relocInfo.cpp
>>>>
>>>> Change seems unnecessary - int32_t is fine
>>>>
>>>
>>> No, int32_t doesn't match the calls below it.  They all assume _lo 
>>> and _hi are jint.
>>>> ---
>>>>
>>>> src/hotspot/share/compiler/compileBroker.cpp
>>>> src/hotspot/share/compiler/compileBroker.hpp
>>>>
>>>> I see a complete mix of int and jint in this class, so why make the 
>>>> one change you did ??
>>>
>>> This is another case of using jint as a flag with cmpxchg.  The 
>>> templates for cmpxchg want the types to match and 0 and 1 are 
>>> essentially 'int'.  This is a lot cleaner this way.
>>
>> <sigh>
>>
>>>>
>>>> ---
>>>>
>>>> src/hotspot/share/jvmci/jvmciCompilerToVM.cpp
>>>>
>>>> 1700     tty->write((char*) start, MIN2(length, (jint)O_BUFLEN));
>>>>
>>>> why did you need to add the jint cast? It's used without any cast on 
>>>> the next two lines:
>>>>
>>>> 1701     length -= O_BUFLEN;
>>>> 1702     offset += O_BUFLEN;
>>>>
>>>
>>> There's a conversion from O_BUFLEN from int to long in 1701 and 
>>> 1702.   MIN2 is a template that wants the types to match exactly.
>>
>> $%^%$! templates!
>>
>>>> ??
>>>>
>>>> ---
>>>>
>>>> src/hotspot/share/jvmci/jvmciRuntime.cpp
>>>>
>>>> Looking around this code it seems very confused about types - eg the 
>>>> previous function is declared jboolean yet returns a jint on one 
>>>> path! It isn't clear to me if the return type is what should be 
>>>> changed or the parameter type? I would just leave this alone.
>>>
>>> I can't leave it alone because it doesn't compile that way. This was 
>>> the minimal change and yea, does look a bit inconsistent.
>>>>
>>>> ---
>>>>
>>>> src/hotspot/share/opto/mulnode.cpp
>>>>
>>>> Okay TypeInt has jint parts, so the remaining int32_t declarations 
>>>> (A, B, C, D) should also be jint.
>>>
>>> Yes.  c2 uses jint types.
>>>>
>>>> ---
>>>>
>>>> src/hotspot/share/opto/parse3.cpp
>>>>
>>>> I agree with the changes you made, but then:
>>>>
>>>>  419     jint dim_con = find_int_con(length[j], -1);
>>>>
>>>> should also be changed.
>>>>
>>>> And obviously MultiArrayExpandLimit should be defined as int not intx!
>>>
>>> Everything in globals.hpp is intx.  That's a thread that I don't want 
>>> to pull on!
>>
>> We still have that limitation? <double sigh>
>>>
>>> Changed dim_con to int.
>>>>
>>>> ---
>>>>
>>>> src/hotspot/share/opto/phaseX.cpp
>>>>
>>>> I can see that intcon(jint i) is consistent with longcon(jlong l), 
>>>> but the use of "i" in the code is more consistent with int than jint.
>>>
>>> huh?  really?
>>>>
>>>> ---
>>>>
>>>> src/hotspot/share/opto/type.cpp
>>>>
>>>> 1505 int TypeInt::hash(void) const {
>>>> 1506   return java_add(java_add(_lo, _hi), java_add((jint)_widen, 
>>>> (jint)Type::Int));
>>>> 1507 }
>>>>
>>>> I can see that the (jint) casts you added make sense, but then the 
>>>> whole function should be returning jint not int. Ditto the other 
>>>> hash functions.
>>>
>>> I'm not messing with this, this is the minimal in type fixing that 
>>> I'm going to do here.
>>
>> <sigh>
>>
>>>>
>>>> ---
>>>>
>>>> src/hotspot/share/prims/jni.cpp
>>>>
>>>> I think vm_created should be a bool. In fact all the fields you 
>>>> changed are logically bools - do Atomics work for bool now?
>>>
>>> No, they do not.   I had thought bool would be better originally too.
>>>>
>>>> ---
>>>>
>>>> src/hotspot/share/prims/jvm.cpp
>>>>
>>>> is_attachable is the terminology used in the JDK code.
>>>
>>> Well the JDK version had is_attach_supported() as the flag name so I 
>>> used that in this one place.
>>>>
>>>> ---
>>>>
>>>> src/hotspot/share/prims/jvmtiEnvBase.cpp
>>>> src/hotspot/share/prims/jvmtiImpl.cpp
>>>>
>>>> Are you making parameters consistent with the fields they initialize?
>>>
>>> They're consistent with the declarations now.
>>>>
>>>> ---
>>>>
>>>> src/hotspot/share/prims/jvmtiTagMap.cpp
>>>>
>>>> There is a mix of int and jint for slot in this code. You fixed 
>>>> some, but this remains:
>>>>
>>>> 2440 inline bool CallbackInvoker::report_stack_ref_root(jlong 
>>>> thread_tag,
>>>> 2441                                                    jlong tid,
>>>> 2442                                                    jint depth,
>>>> 2443 jmethodID method,
>>>> 2444 jlocation bci,
>>>> 2445                                                    jint slot,
>>>
>>> Right for consistency with the declarations.
>>>>
>>>> ---
>>>>
>>>> src/hotspot/share/runtime/perfData.cpp
>>>>
>>>> Callers pass both jint and int, so param type seems arbitrary.
>>>
>>> They are, but importantly they match the declarations.
>>>>
>>>> ---
>>>>
>>>> src/hotspot/share/runtime/perfMemory.cpp
>>>> src/hotspot/share/runtime/perfMemory.hpp
>>>>
>>>> PerfMemory::_initialized should ideally be a bool - can OrderAccess 
>>>> handle that now?
>>>
>>> Nope.
>>>>
>>>> ---
>>>>
>>>> src/java.base/share/native/include/jvm.h
>>>>
>>>> Not clear why the jio functions are not also JNICALL ?
>>>
>>> They are now.  The JDK version didn't have JNICALL.  JVM needs 
>>> JNICALL.  I can't tell you why JDK didn't need JNICALL linkage.
>>
>> ?? JVM currently does not have JNICALL. But they are declared as 
>> "extern C".
> 
> This was a compilation error on Windows with JDK.   Maybe the C code in 
> the JDK doesn't complain about linkage differences.  I'll have to go 
> back and figure this out then.
>>
>>>>
>>>> ---
>>>>
>>>> src/java.base/unix/native/include/jni_md.h
>>>>
>>>> There is no need to special case ARM. The differences in the 
>>>> existing code were for LTO support and that is now irrelevant.
>>>
>>> See discussion with Magnus.   We still build ARM for jdk10/hs so I 
>>> needed this conditional or of course I wouldn't have added it.  We 
>>> can remove it with LTO support.
>>
>> Those builds are gone - this is obsolete. But yes all LTO can be 
>> removed later if you wish. Just trying to simplify things now.
>>
>>>>
>>>> ---
>>>>
>>>> src/java.base/unix/native/include/jvm_md.h
>>>>
>>>> I know you've just copied this across, but it seems wrong to me:
>>>>
>>>>  57 // Hack: MAXPATHLEN is 4095 on some Linux and 4096 on others. 
>>>> This may
>>>>   58 //       cause problems if JVM and the rest of JDK are built on 
>>>> different
>>>>   59 //       Linux releases. Here we define JVM_MAXPATHLEN to be 
>>>> MAXPATHLEN + 1,
>>>>   60 //       so buffers declared in VM are always >= 4096.
>>>>   61 #define JVM_MAXPATHLEN MAXPATHLEN + 1
>>>>
>>>> It doesn't make sense to me to define an internal "max path length" 
>>>> that can _exceed_ the platform max!
>>>>
>>>> That aside there's no support for building different parts of the 
>>>> JDK on different platforms and then bringing them together. And in 
>>>> any case I would think the real problem would be building on a 
>>>> platform that uses 4096 and running on one that uses 4095!
>>>>
>>>> But that aside this is a Linux hack and should be guarded by ifdef 
>>>> LINUX. (I doubt BSD needs it, the bsd file is just a copy of the 
>>>> linux one - the JDK macosx version does the right thing). Solaris 
>>>> and AIX should stay as-is at MAXPATHLEN.
>>>
>>> All of the unix platforms had MAXPATHLEN+1.  I'll leave it for now 
>>> and we can investigate that further.
>>
>> I see the following existing code:
>>
>> src/java.base/unix/native/include/jvm_md.h:
>>
>> #define JVM_MAXPATHLEN MAXPATHLEN
>>
>> src/java.base/macosx/native/include/jvm_md.h
>>
>> #define JVM_MAXPATHLEN MAXPATHLEN
>>
>> src/hotspot/os/aix/jvm_aix.h
>>
>> #define JVM_MAXPATHLEN MAXPATHLEN
>>
>> src/hotspot/os/bsd/jvm_bsd.h
>>
>> #define JVM_MAXPATHLEN MAXPATHLEN + 1  // blindly copied from Linux 
>> version
>>
>> src/hotspot/os/linux/jvm_linux.h
>>
>> #define JVM_MAXPATHLEN MAXPATHLEN + 1
>>
>> src/hotspot/os/solaris/jvm_solaris.h
>>
>> #define JVM_MAXPATHLEN MAXPATHLEN
>>
>> This is a linux only hack (if you ignore the blind copy from linux 
>> into the BSD code in the VM).
> 
> Oh, thanks, so should I add a bunch of ifdefs then?  Or do you think 
> having MAXPATHLEN + 1 will really break the other platforms?  Do you 
> really see this as a problem or are you just pointing out inconsistency?
>>
>>>>
>>>>  86 #define ASYNC_SIGNAL     SIGJVM2
>>>>
>>>> This only exists on Solaris so I think should be in #ifdef SOLARIS, 
>>>> to make that clear.
>>>
>>> Ok.  I'll add this.
>>>>
>>>> ---
>>>>
>>>> src/java.base/windows/native/include/jvm_md.h
>>>>
>>>> Given the differences between the two versions either something has 
>>>> been broken or "extern C" declarations are not needed :)
>>>
>>> Well, they are needed for Hotspot to build and do not prevent jdk 
>>> from building.  I don't know what was broken.
>>
>> We really need to understand this better. Maybe related to the map 
>> files that expose the symbols. ??
> 
> They're needed because the JDK files are written mostly in C and that 
> doesn't complain about the linkage difference.  Hotspot files are in C++ 
> which does complain.
> 
>>
>>>>
>>>> ---
>>>>
>>>> That was a really painful way to spend most of my Friday. TGIF! :)
>>>
>>> Thanks for going through it.  See comments inline for changes. 
>>> Generating a webrev takes hours so I'm not going to do that unless 
>>> you insist.
>>
>> An incremental webrev shouldn't take long - right? You're a mq maestro 
>> now. :)
> 
> Well I generally trash a repository whenever I use mq but sure.
>>
>> If you can reasonably produce an incremental webrev once you've 
>> settled on all the comments/issues that would be good.
> 
> Ok, sure.
> 
> Coleen
>>
>> Thanks,
>> David
>>
>>> Thanks,
>>> Coleen
>>>
>>>
>>>>
>>>> Thanks,
>>>> David
>>>> -----
>>>>
>>>>
>>>> On 27/10/2017 6:44 AM, coleen.phillimore at oracle.com wrote:
>>>>>   Hi Magnus,
>>>>>
>>>>> Thank you for reviewing this.   I have a new version that takes out 
>>>>> the hack in globalDefinitions.hpp and adds casts to 
>>>>> src/hotspot/share/opto/type.cpp instead.
>>>>>
>>>>> Also some fixes from Martin at SAP.
>>>>>
>>>>> open webrev at http://cr.openjdk.java.net/~coleenp/8189610.02/webrev
>>>>>
>>>>> see below.
>>>>>
>>>>> On 10/26/17 5:57 AM, Magnus Ihse Bursie wrote:
>>>>>> Coleen,
>>>>>>
>>>>>> Thank you for addressing this!
>>>>>>
>>>>>> On 2017-10-25 18:49, coleen.phillimore at oracle.com wrote:
>>>>>>> Summary: removed hotspot version of jvm*h and jni*h files
>>>>>>>
>>>>>>> Mostly used sed to remove prims/jvm.h and move #include "jvm.h" 
>>>>>>> after precompiled.h, so if you have repetitive stress wrist 
>>>>>>> issues don't click on most of these files.
>>>>>>>
>>>>>>> There were more issues to resolve, however.  The JDK windows 
>>>>>>> jni_md.h file defined jint as long and the hotspot windows 
>>>>>>> jni_x86.h as int. I had to choose the jdk version since it's the 
>>>>>>> public version, so there are changes to the hotspot files for 
>>>>>>> this. Generally I changed the code to use 'int' rather than 
>>>>>>> 'jint' where the surrounding API didn't insist on consistently 
>>>>>>> using java types. We should mostly be using C++ types within 
>>>>>>> hotspot except in interfaces to native/JNI code.  There are a 
>>>>>>> couple of hacks in places where adding multiple jint casts was 
>>>>>>> too painful.
>>>>>>>
>>>>>>> Tested with JPRT and tier2-4 (in progress).
>>>>>>>
>>>>>>> open webrev at http://cr.openjdk.java.net/~coleenp/8189610.01/webrev
>>>>>>
>>>>>> Looks great!
>>>>>>
>>>>>> Just a few comments:
>>>>>>
>>>>>> * src/java.base/unix/native/include/jni_md.h:
>>>>>>
>>>>>> I don't think the externally_visible attribute should be there for 
>>>>>> arm. I know this was the case for the corresponding hotspot file 
>>>>>> for arm, but that was techically incorrect. The proper dependency 
>>>>>> here is that externally_visible should be in all JNIEXPORT if and 
>>>>>> only if we're building with JVM feature "link-time-opt". 
>>>>>> Traditionally, that feature been enabled when building arm32 
>>>>>> builds, and only then, so there's been a (coincidentally) 
>>>>>> connection here. Nowadays, Oracle does not care about the arm32 
>>>>>> builds, and I'm not sure if anyone else is building them with 
>>>>>> link-time-opt enabled.
>>>>>>
>>>>>> It does seem wrong to me to export this behavior in the public 
>>>>>> jni_md.h file, though. I think the correct way to solve this, if 
>>>>>> we should continue supporting link-time-opt is to make sure this 
>>>>>> attribute is set for exported hotspot functions. If it's still 
>>>>>> needed, that is. A quick googling seems to indicate that 
>>>>>> visibility("default") might be enough in modern gcc's.
>>>>>>
>>>>>> A third option is to remove the support for link-time-opt 
>>>>>> entirely, if it's not really used.
>>>>>
>>>>> I didn't know how to change this since we are still building ARM 
>>>>> with the jdk10/hs repository, and ARM needed this change.  I could 
>>>>> wait until we bring down the jdk10/master changes that remove the 
>>>>> ARM build and remove this conditional before I push. Or we could 
>>>>> file an RFE to remove link-time-opt (?) and remove it then?
>>>>>
>>>>>>
>>>>>> * src/java.base/unix/native/include/jvm_md.h and 
>>>>>> src/java.base/windows/native/include/jvm_md.h:
>>>>>>
>>>>>> These files define a public API, and contain non-trivial changes. 
>>>>>> I suspect you should file a CSR request. (Even though I realize 
>>>>>> you're only matching the header file with the reality.)
>>>>>>
>>>>>
>>>>> I filed the CSR.   Waiting for the next steps.
>>>>>
>>>>> Thanks,
>>>>> Coleen
>>>>>
>>>>>> /Magnus
>>>>>>
>>>>>>> bug link https://bugs.openjdk.java.net/browse/JDK-8189610
>>>>>>>
>>>>>>> I have a script to update copyright files on commit.
>>>>>>>
>>>>>>> Thanks to Magnus and ErikJ for the makefile changes.
>>>>>>>
>>>>>>> Thanks,
>>>>>>> Coleen
>>>>>>>
>>>>>>
>>>>>
>>>
> 



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