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Re: [RFC PATCH v1 2/9] uaccess: Convert INLINE_COPY_{TO/FROM}_USER to kconfig and reduce ifdefery
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Yury Norov <ynorov@xxxxxxxxxx>
- Date: Mon, 27 Apr 2026 16:47:53 -0400
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- Cc: "Christophe Leroy (CS GROUP)" <chleroy@xxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, David Laight <david.laight.linux@xxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, linux-alpha@xxxxxxxxxxxxxxx, Yury Norov <yury.norov@xxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, linux-snps-arc@xxxxxxxxxxxxxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, linux-mips@xxxxxxxxxxxxxxx, linuxppc-dev@xxxxxxxxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, linux-riscv@xxxxxxxxxxxxxxxxxxx, linux-s390@xxxxxxxxxxxxxxx, sparclinux@xxxxxxxxxxxxxxx, linux-um@xxxxxxxxxxxxxxxxxxx, dmaengine@xxxxxxxxxxxxxxx, linux-efi@xxxxxxxxxxxxxxx, linux-fsi@xxxxxxxxxxxxxxxx, amd-gfx@xxxxxxxxxxxxxxxxxxxxx, dri-devel@xxxxxxxxxxxxxxxxxxxxx, intel-gfx@xxxxxxxxxxxxxxxxxxxxx, linux-wpan@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, linux-wireless@xxxxxxxxxxxxxxx, linux-spi@xxxxxxxxxxxxxxx, linux-media@xxxxxxxxxxxxxxx, linux-staging@xxxxxxxxxxxxxxx, linux-serial@xxxxxxxxxxxxxxx, linux-usb@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, ocfs2-devel@xxxxxxxxxxxxxxx, bpf@xxxxxxxxxxxxxxx, kasan-dev@xxxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, linux-x25@xxxxxxxxxxxxxxx, rust-for-linux@xxxxxxxxxxxxxxx, linux-sound@xxxxxxxxxxxxxxx, sound-open-firmware@xxxxxxxxxxxxxxxx, linux-csky@xxxxxxxxxxxxxxx, linux-hexagon@xxxxxxxxxxxxxxx, loongarch@xxxxxxxxxxxxxxx, linux-m68k@xxxxxxxxxxxxxxxxxxxx, linux-openrisc@xxxxxxxxxxxxxxx, linux-parisc@xxxxxxxxxxxxxxx, linux-sh@xxxxxxxxxxxxxxx, linux-arch@xxxxxxxxxxxxxxx
- Delivery-date: Mon, 27 Apr 2026 20:48:17 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Mon, Apr 27, 2026 at 09:39:33PM +0100, Andrew Cooper wrote:
> On 27/04/2026 7:39 pm, Yury Norov wrote:
> > On Mon, Apr 27, 2026 at 07:13:43PM +0200, Christophe Leroy (CS GROUP) wrote:
> >> Among the 21 architectures supported by the kernel, 16 define both
> >> INLINE_COPY_TO_USER and INLINE_COPY_FROM_USER while the 5 other ones
> >> don't define any of the two.
> >>
> >> To simplify and reduce risk of mistakes, convert them to a single
> >> kconfig item named CONFIG_ARCH_WANTS_NOINLINE_COPY which will be
> > We've got a special word for it: outline. Can you name it
> > CONFIG_OUTLINE_USERCOPY, or similar?
>
> You can't swap the "in" for "out" like this. "out of line" is the
> opposite of "inline" in this context, while "outline" means something
> different and unrelated.
Check KASAN_OUTLINE vs KASAN_INLINE for example
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