linux-kernel - Re: [PATCH] riscv: kexec: Cleanup riscv_kexec

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Message-ID: <mvmmsy956xa.fsf@suse.de>
Date:   Wed, 30 Aug 2023 09:24:33 +0200
From:   Andreas Schwab <schwab@...e.de>
To:     Song Shuai <songshuaishuai@...ylab.org>
Cc:     paul.walmsley@...ive.com, palmer@...belt.com,
        aou@...s.berkeley.edu, mick@....forth.gr, alex@...ti.fr,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] riscv: kexec: Cleanup riscv_kexec_relocate

On Aug 30 2023, Song Shuai wrote:

> @@ -52,21 +42,27 @@ SYM_CODE_START(riscv_kexec_relocate)
>  	 * the start of the loop below so that we jump there in
>  	 * any case.
>  	 */
> -	la	s8, 1f
> -	sub	s8, s8, s7
> -	csrw	CSR_STVEC, s8
> +	la	s6, 1f
> +	sub	s6, s6, s4
> +	csrw	CSR_STVEC, s6
> +
> +	/*
> +	 * With C-extension, here we get 42 Bytes and the next
> +	 * .align directive would pad zeros here up to 44 Bytes.
> +	 * So manually put a nop here to avoid zeros padding.
> +	*/
> +	nop
>  
>  	/* Process entries in a loop */
>  .align 2

While you are at it, I'd suggest being explicit about .palign
vs. .balign.

-- 
Andreas Schwab, SUSE Labs, schwab@...e.de
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE  1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."