linux-kernel - Re: [PATCH v2 20/23] x86,usercopy: Remove .fixup usage

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Date:   Wed, 10 Nov 2021 23:51:43 -0800
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org, mark.rutland@....com,
        dvyukov@...gle.com, seanjc@...gle.com, pbonzini@...hat.com,
        mbenes@...e.cz
Subject: Re: [PATCH v2 20/23] x86,usercopy: Remove .fixup usage

On Wed, Nov 10, 2021 at 11:01:22AM +0100, Peter Zijlstra wrote:
> +static bool ex_handler_ucopy_leng(const struct exception_table_entry *fixup,
> +				   struct pt_regs *regs, int trapnr, int reg, int imm)
> +{
> +	regs->cx = imm * regs->cx + *pt_regs_nr(regs, reg);
> +	return ex_handler_uaccess(fixup, regs, trapnr);
> +}
> +
>  int ex_get_fixup_type(unsigned long ip)
>  {
>  	const struct exception_table_entry *e = search_exception_tables(ip);
> @@ -217,6 +224,8 @@ int fixup_exception(struct pt_regs *regs
>  		return ex_handler_imm_reg(e, regs, reg, imm);
>  	case EX_TYPE_FAULT_SGX:
>  		return ex_handler_sgx(e, regs, trapnr);
> +	case EX_TYPE_UCOPY_LEN:
> +		return ex_handler_ucopy_leng(e, regs, trapnr, reg, imm);

"leng"?

-- 
Josh