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Date:   Mon, 20 Jun 2022 15:26:37 +0100
From:   Mark Rutland <mark.rutland@arm.com>
To:     Tong Tiangen <tongtiangen@huawei.com>
Cc:     James Morse <james.morse@arm.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        Robin Murphy <robin.murphy@arm.com>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Paul Mackerras <paulus@samba.org>, x86@kernel.org,
        "H . Peter Anvin" <hpa@zytor.com>, linuxppc-dev@lists.ozlabs.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org, Kefeng Wang <wangkefeng.wang@huawei.com>,
        Xie XiuQi <xiexiuqi@huawei.com>,
        Guohanjun <guohanjun@huawei.com>
Subject: Re: [PATCH -next v5 2/8] arm64: extable: make uaaccess helper use
 extable type EX_TYPE_UACCESS_ERR_ZERO
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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.