linux-kernel - RE: [PATCH v3 4/4] RISC-V: Add arch functions to support hibernation/suspend-to-disk

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Date:   Fri, 03 Feb 2023 06:30:24 +0000
From:   Conor Dooley <conor@...nel.org>
To:     JeeHeng Sia <jeeheng.sia@...rfivetech.com>,
        Alexandre Ghiti <alexghiti@...osinc.com>
CC:     "paul.walmsley@...ive.com" <paul.walmsley@...ive.com>,
        "palmer@...belt.com" <palmer@...belt.com>,
        "aou@...s.berkeley.edu" <aou@...s.berkeley.edu>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Leyfoon Tan <leyfoon.tan@...rfivetech.com>,
        Mason Huo <mason.huo@...rfivetech.com>
Subject: RE: [PATCH v3 4/4] RISC-V: Add arch functions to support hibernation/suspend-to-disk



On 3 February 2023 03:43:35 GMT, JeeHeng Sia <jeeheng.sia@...rfivetech.com> wrote:
>
>
>> -----Original Message-----
>> From: Conor Dooley <conor@...nel.org>
>> Sent: Tuesday, 31 January, 2023 7:31 AM
>> To: JeeHeng Sia <jeeheng.sia@...rfivetech.com>; Alexandre Ghiti <alexghiti@...osinc.com>
>> Cc: paul.walmsley@...ive.com; palmer@...belt.com; aou@...s.berkeley.edu; linux-riscv@...ts.infradead.org; linux-
>> kernel@...r.kernel.org; Leyfoon Tan <leyfoon.tan@...rfivetech.com>; Mason Huo <mason.huo@...rfivetech.com>
>> Subject: Re: [PATCH v3 4/4] RISC-V: Add arch functions to support hibernation/suspend-to-disk
>> 
>> +CC Alex
>> 
>> Alex, could you take a look at the page table bits here when you get a
>> chance please?
>> 
>> > + * @a0 - destination
>> > + * @a1 - source
>> > + */
>> > +	.macro	copy_page a0, a1
>> > +		lui	a2, 0x1
>> > +		add	a2, a2, a0
>> > +.1 :
>> > +		REG_L	t0, 0(a1)
>> > +		REG_L	t1, SZREG(a1)
>> > +
>> > +		REG_S	t0, 0(a0)
>> > +		REG_S	t1, SZREG(a0)
>> > +
>> > +		addi	a0, a0, 2 * SZREG
>> > +		addi	a1, a1, 2 * SZREG
>> > +		bne	a2, a0, .1
>> 
>> allmodconfig, clang 15.0.4:
>> 
>> <instantiation>:3:1: error: unexpected token at start of statement
>> .1 :
>> ^
>> /stuff/linux/arch/riscv/kernel/hibernate-asm.S:83:2: note: while in macro instantiation
>>  copy_page a0, a1
>>  ^
>> <instantiation>:12:15: error: unknown operand
>>   bne a2, a0, .1
>>               ^
>> /stuff/linux/arch/riscv/kernel/hibernate-asm.S:83:2: note: while in macro instantiation
>>  copy_page a0, a1
>>  ^
>> make[5]: *** [/stuff/linux/scripts/Makefile.build:384: arch/riscv/kernel/hibernate-asm.o] Error 1
>Hi Conor, I couldn't reproduce the above error, could you share the build command please?

It was just allmodconfig with LLVM=1

>> 
>> > +	.endm
>> > +
>> >  #endif	/* __ASM_ASSEMBLER_H */
> 
>> Thanks,
>> Conor.
>