Date:   Thu, 28 Oct 2021 10:06:10 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v1 1/1] delay: Replace kernel.h with the necessary
 inclusions

On 10/28/21 9:50 AM, Andy Shevchenko wrote:
> On Thu, Oct 28, 2021 at 09:28:10AM -0700, Guenter Roeck wrote:
>> On Thu, Oct 28, 2021 at 06:58:13PM +0300, Andy Shevchenko wrote:
>>> On Thu, Oct 28, 2021 at 08:30:55AM -0700, Guenter Roeck wrote:
>>>> On Wed, Oct 27, 2021 at 06:03:24PM +0300, Andy Shevchenko wrote:
>>>>> When kernel.h is used in the headers it adds a lot into dependency hell,
>>>>> especially when there are circular dependencies are involved.
>>>>>
>>>>> Replace kernel.h inclusion with the list of what is really being used.
>>>>>
>>>>> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
>>>>
>>>> In next-20211028:
>>>>
>>>> Building riscv32:defconfig ... failed
>>>> --------------
>>>> Error log:
>>>> arch/riscv/lib/delay.c: In function '__delay':
>>>> arch/riscv/lib/delay.c:77:17: error: implicit declaration of function 'cpu_relax'
>>>>
>>>> Building riscv:defconfig ... failed
>>>> --------------
>>>> Error log:
>>>> arch/riscv/lib/delay.c: In function '__delay':
>>>> arch/riscv/lib/delay.c:77:17: error: implicit declaration of function 'cpu_relax'
>>>>
>>>> Building s390:defconfig ... failed
>>>> --------------
>>>> Error log:
>>>> <stdin>:1559:2: warning: #warning syscall futex_waitv not implemented [-Wcpp]
>>>> In file included from arch/s390/pci/pci_insn.c:12:
>>>> arch/s390/include/asm/facility.h: In function '__stfle':
>>>> arch/s390/include/asm/facility.h:98:22: error: implicit declaration of function 'min_t'
>>>>
>>>> bisect to this patch. Probably more, but it is difficult to find out
>>>> since -next is too badly broken and has build failures all over the place.
>>>
>>> Thanks for the report!
> 
> I'll send the fix for above soon. Hope it will reduce amount of failures.
> 
>>> I have run it on x86_64 with `kcbench -m ...` and no failures.
>>>
>>> Can you share all build errors you found so far? I believe none of them related
>>> to x86* code.
>>>
>>> Above just revealed the problematic places in the first place. Why the
>>> programmers rely on delay.h to include full bloated header pile?! (Yeah, this
>>> is rhetorical, so please share the errors, I'll try to address them)
>>
>> The ones listed above are the ones I was able to identify. As I said, there
>> are so many compile and runtime failures in linux-next that it is difficult
>> to track down individual failures.
> 
> Yeah, for example, I looked into this: https://kerneltests.org/builders/next-mips-next/builds/698/steps/buildcommand/logs/stdio
> 
> I can't see how my patch is related to this...
> 

The missing errno.h in that log is due to missing dependencies in the
fanotify patch - it causes build failures whenever a toolchain without
C library support is used to build the kernel. I already reported this.

The unused variable error bisects to 'irq: mips: simplify do_domain_IRQ()'.
I'll send a report as response to that patch in a minute.

It all adds up ... there seem to be a lot of last minute changes in -next.

Guenter

>> Just to give you an idea (this is for
>> next-20211028):
>>
>> Build results:
>> 	total: 153 pass: 115 fail: 38
>> Failed builds:
>> 	alpha:allmodconfig
>> 	arm:allmodconfig
>> 	arm:omap2plus_defconfig
>> 	arm:davinci_all_defconfig
>> 	arm64:defconfig
>> 	arm64:allmodconfig
>> 	csky:allmodconfig
>> 	h8300:allnoconfig
>> 	h8300:tinyconfig
>> 	h8300:edosk2674_defconfig
>> 	h8300:h8300h-sim_defconfig
>> 	h8300:h8s-sim_defconfig
>> 	m68k:allmodconfig
>> 	mips:defconfig
>> 	mips:allmodconfig
>> 	mips:allnoconfig
>> 	mips:tinyconfig
>> 	mips:bcm47xx_defconfig
>> 	mips:bcm63xx_defconfig
>> 	mips:ath79_defconfig
>> 	mips:ar7_defconfig
>> 	mips:e55_defconfig
>> 	mips:cavium_octeon_defconfig
>> 	mips:malta_defconfig
>> 	mips:rt305x_defconfig
>> 	nds32:allmodconfig
>> 	parisc:allmodconfig
>> 	parisc:generic-32bit_defconfig
>> 	parisc64:generic-64bit_defconfig
>> 	powerpc:allmodconfig
>> 	riscv32:defconfig
>> 	riscv32:allmodconfig
>> 	riscv:defconfig
>> 	riscv:allmodconfig
>> 	s390:defconfig
>> 	s390:allmodconfig
>> 	sparc64:allmodconfig
>> 	xtensa:allmodconfig
>> Qemu test results:
>> 	total: 480 pass: 315 fail: 165
>> Failed tests:
>> 	<too many to list them all>
>>
>> Build and boot logs are as always at https://kerneltests.org/builders
>> in the 'next' column in case you want to do some digging yourself.
> 

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