On Mon, Jan 15, 2018 at 05:22:01PM +0000, Dave Martin wrote:

On Tue, Jan 09, 2018 at 07:51:20PM +0300, Yury Norov wrote:

quoted

On Mon, Jan 08, 2018 at 05:49:05PM +0300, Yury Norov wrote:

quoted

On Tue, Oct 31, 2017 at 03:50:52PM +0000, Dave Martin wrote:

quoted

This series implements Linux kernel support for the ARM Scalable Vector
Extension (SVE). [1]  It supersedes the previous v3: see [3] for link
and full cover letter.

This is a minor update to v4, but does contain a couple of important
fixes.

As in previous postings, the last two patches (here 29-30) are still
RFC and not proposed for merging at this time.

The patches apply on
git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git
for-next/core
d7b1d22d3821 ("arm64: uapi: Remove PSR_Q_BIT")

To reduce spam, some people may not been copied on the entire series.
For those who did not receive the whole series, it can be found in the
linux-arm-kernel archive. [2]

See the individual patches for details of changes.

For reviewer convenience, a git tree is available. [4]

Since there are some changes against already-reviewed patches, I've also
pushed an unsquashed fixes tree for people to take a look at if it
helps. [5]


Summary:

 * "regset: Add support for dynamically sized regsets" fixed to avoid
   x86 breakage;

 * one trival arm64 patch added to add asmlinkage annotations, and a
   corresponding minor change to the Core task context handling patch;

 * one new arm64 fix ("signal: Verify extra data is user-readable in
   sys_rt_sigreturn") to ensure that access_ok() checks are done for the
   whole extended signal frame, not just the base frame;

 * one minor fix to the SVE sigreturn code to return consistent
   intermediate error values (semantic correctness, non-functional
   change);

 * one minor change to call __copy_from_user() instead of
   copy_from_user() in a situation where there is already an access_ok()
   check;


[1] ARM Scalable Vector Extension
https://community.arm.com/groups/processors/blog/2016/08/22/technology-update-the-scalable-vector-extension-sve-for-the-armv8-a-architecture

[2] linux-arm-kernel October 2017 Archives by thread
http://lists.infradead.org/pipermail/linux-arm-kernel/2017-October/thread.html

[3] [PATCH v4 00/28] ARM Scalable Vector Extension (SVE)
http://lists.infradead.org/pipermail/linux-arm-kernel/2017-October/539414.html

[4] For review and testing only -- **do not pull**
    (This branch has review changelogs which should not form part of
    the final commits.)

    v5 series (this posting)

    http://linux-arm.org/git?p=linux-dm.git;a=shortlog;h=refs/heads/sve/v5
    git://linux-arm.org/linux-dm.git sve/v5

[5] For review and testing only -- **do not pull**
    (This branch has review changelogs which should not form part of
    the final commits.)

    v4 with unsquashed fixes

    http://linux-arm.org/git?p=linux-dm.git;a=shortlog;h=refs/heads/sve/v4%2Bfixes
    git://linux-arm.org/linux-dm.git sve/v4+fixes

Hi Dave,

During rebase of my ILP32 series on 4.15 kernel I found that 
ILP32 needs to be enabled with SVE support, like you do for 
LP64 in this series.

I did all rebase work on this draft branch:
https://github.com/norov/linux/tree/ilp32-4.15-rc7

But any ILP32 program I tried crash, and the message in dmesg looks
like this:
[   39.510667] CPU: 0 PID: 1857 Comm: mytime Not tainted 4.15.0-rc7-00028-g45e0659df4d9 #41
[   39.510712] Hardware name: linux,dummy-virt (DT)
[   39.510829] pstate: 00000000 (nzcv daif -PAN -UAO)
[   39.511101] pc : 0x33488e28
[   39.511125] lr : 0x33488e28
[   39.511138] sp : 00000000fffef670
[   39.511158] x29: 000000005a536c33 x28: 0000000000000000 
[   39.511211] x27: 0000000000000000 x26: 0000000000000000 
[   39.511235] x25: 0000000000000000 x24: 0000000000000000 
[   39.511257] x23: 0000000000466000 x22: 0000000000000000 
[   39.511278] x21: 0000000000000000 x20: 000000000047f2a8 
[   39.511300] x19: 0000000000000000 x18: 0000000000000001 
[   39.511321] x17: 0000000000001000 x16: 0000000000001030 
[   39.511342] x15: 0000000000554e47 x14: 0000000000000001 
[   39.511364] x13: 0000000000000004 x12: 000000000000003c 
[   39.511385] x11: 0000100000000000 x10: 0800000000000000 
[   39.511406] x9 : 0fffffffffffffff x8 : 000000000000007c 
[   39.511427] x7 : 0000000000000077 x6 : 0000000000000041 
[   39.511448] x5 : 0000000000000411 x4 : 00000000fbad2488 
[   39.511468] x3 : 0000000000000001 x2 : 0000000000497950 
[   39.511489] x1 : 0000000000497550 x0 : 0000000000000001

Hi Dave,

I fixed the crash. It was my local problem.

Ah, right :)

I'll take a look at your code anyway in case there's something
else one of us didn't think of.

Thanks, Dave.

This is the branch:
https://github.com/norov/linux/tree/ilp32-4.15-rc7

SVE-related changes are mostly in patches:
arm64: ilp32: introduce ilp32-specific handlers for sigframe and ucontext
arm64: signal32: move ilp32 and aarch32 common code to separated file
arm64: signal: share lp64 signal structures and routines to ilp32
arm64: ilp32: add sys_ilp32.c and a separate table (in entry.S) to use it

Yury