linux-kernel - Re: linux-next: build failure after merge of the arm-perf tree

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Date:   Wed, 13 Dec 2023 10:15:25 +0000
From:   James Clark <james.clark@....com>
To:     Will Deacon <will@...nel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: build failure after merge of the arm-perf tree



On 13/12/2023 09:30, Will Deacon wrote:
> Hi Stephen, [+James]
> 
> On Wed, Dec 13, 2023 at 10:09:31AM +1100, Stephen Rothwell wrote:
>> After merging the arm-perf tree, today's linux-next build (x86_64
>> allmodconfig) failed like this:
>>
>> In file included from drivers/perf/arm_dmc620_pmu.c:26:
>> include/linux/perf/arm_pmu.h:15:10: fatal error: asm/cputype.h: No such file or directory
>>    15 | #include <asm/cputype.h>
>>       |          ^~~~~~~~~~~~~~~
> 
> Damn, I tested with allnoconfig, defconfig and allmodconfig before I pushed,
> but only for ARCH=arm64. Thanks for reporting this.
> 
>> I can't easily tell what caused this - possibly commit
>>
>>   a5f4ca68f348 ("perf/arm_dmc620: Remove duplicate format attribute #defines")
>>
>> I have used the arm-perf and arm64 trees from next-20231212 for today
>> (since the arm64 tree merged the arm-perf tree).
> 
> That looks likely. I'll try reverting it and see if it resolves the problem
> locally.
> 
> Cheers,
> 
> Will


Oops sorry about that, I didn't expect that change to break the x86
build so I didn't test it there, but it's because of CONFIG_COMPILE_TEST.

a5f4ca68f348 is the offending commit, and reverting it would fix it (it
was just a tidyup). But this change below also works. That include was
to build ARM_PMU_PROBE which is only used in perf_event_v6.c (and v7)
which both already include asm/cputype.h. Although maybe that would be a
bit of a hack.

diff --git a/include/linux/perf/arm_pmu.h b/include/linux/perf/arm_pmu.h
index 337f01674b38..a4876b1c481a 100644
--- a/include/linux/perf/arm_pmu.h
+++ b/include/linux/perf/arm_pmu.h
@@ -12,7 +12,6 @@
 #include <linux/perf_event.h>
 #include <linux/platform_device.h>
 #include <linux/sysfs.h>
-#include <asm/cputype.h>

 #ifdef CONFIG_ARM_PMU