linux-kernel - Re: [PATCH -next v5 2/8] arm64: extable: make uaaccess helper use extable type EX_TYPE_UACCESS_ERR

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Message-ID: <YrCDnc8ZjgbHAhGU@FVFF77S0Q05N>
Date:   Mon, 20 Jun 2022 15:26:37 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     Tong Tiangen <tongtiangen@...wei.com>
Cc:     James Morse <james.morse@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Robin Murphy <robin.murphy@....com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>, x86@...nel.org,
        "H . Peter Anvin" <hpa@...or.com>, linuxppc-dev@...ts.ozlabs.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Kefeng Wang <wangkefeng.wang@...wei.com>,
        Xie XiuQi <xiexiuqi@...wei.com>,
        Guohanjun <guohanjun@...wei.com>
Subject: Re: [PATCH -next v5 2/8] arm64: extable: make uaaccess helper use
 extable type EX_TYPE_UACCESS_ERR_ZERO

On Mon, Jun 20, 2022 at 10:13:41PM +0800, Tong Tiangen wrote:
> 
> 
> 在 2022/6/20 17:10, Mark Rutland 写道:
> > On Mon, Jun 20, 2022 at 10:59:12AM +0800, Tong Tiangen wrote:
> > > 在 2022/6/18 20:40, Mark Rutland 写道:
> > > The following errors are reported during compilation:
> > > [...]
> > > arch/arm64/lib/clear_user.S:45: Error: invalid operands (*ABS* and *UND*
> > > sections) for `<<'
> > > [...]
> > 
> > As above, I'm not seeing this.
> > 
> > This suggests that the EX_DATA_REG() macro is going wrong somehow. Assuming the
> > operand types correspond to the LHS and RHS of the expression, this would mean
> > the GPR number is defined, but the REG value is not, and I can't currently see
> > how that can happen.
 
> Now I can compile success, both versions 9.4.0 and 11.2.0.
> 
> I should have made a mistake. There is no problem using your implementation.
> I will send a new version these days.

No problem; thanks for confirming!

Mark.