LKML Archive on
 help / color / Atom feed
From: Palmer Dabbelt <>
Cc: Christoph Hellwig <>,, Arnd Bergmann <>,, Andrew Waterman <>,,,,,
Subject: Re: [PATCH v2 2/2] RISC-V: Don't use a global include guard for uapi/asm/syscalls.h
Date: Thu, 09 Aug 2018 18:03:54 -0700 (PDT)
Message-ID: <mhng-80aa1c8e-e2ed-4662-8715-4bb9e6ba7598@palmer-si-x1c4> (raw)
In-Reply-To: <>

On Thu, 09 Aug 2018 14:24:22 PDT (-0700), wrote:
> On Thu, Aug 09, 2018 at 01:25:24PM -0700, Palmer Dabbelt wrote:
>> This file is expected to be included multiple times in the same file in
>> order to allow the __SYSCALL macro to generate system call tables.  With
>> a global include guard we end up missing __NR_riscv_flush_icache in the
>> syscall table, which results in icache flushes that escape the vDSO call
>> to not actually do anything.
>> The fix is to move to per-#define include guards, which allows the
>> system call tables to actually be populated.  Thanks to Macrus Comstedt
>> for finding and fixing the bug!
>> I also went ahead and fixed the SPDX header to use a //-style comment,
>> which I've been told is the canonical way to do it.
>> Cc: Marcus Comstedt <>
>> Signed-off-by: Palmer Dabbelt <>
> [Compile-]Tested-by: Guenter Roeck <>
> on top of linux-next after reverting the version of the patch there.
> I also tried to run the resulting image (defconfig) with qemu (built
> from, but that still doesn't
> work. I assume there are still some patches missing ?

Do you have the PLIC patches?  They'll be necessary to make this all work, and 
there's a v4 out now that when combined with for-next should get you to 

Also, what is your methodology?  I follow

and could could natively compile and run hello world with an earlier version of 
Christoph's patch set, which is really only cosmetically different than the v4.  
I use qemu's master branch as well, which when I tried was exactly 3.0.0-rc3.

  reply index

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-09 20:25 [PATCH v2 0/2] RISC-V: Don't use a global include guard for uapi/asm/syscalls Palmer Dabbelt
2018-08-09 20:25 ` [PATCH v2 1/2] RISC-V: Define sys_riscv_flush_icache when SMP=n Palmer Dabbelt
2018-08-09 21:20   ` Guenter Roeck
2018-08-09 20:25 ` [PATCH v2 2/2] RISC-V: Don't use a global include guard for uapi/asm/syscalls.h Palmer Dabbelt
2018-08-09 21:24   ` Guenter Roeck
2018-08-10  1:03     ` Palmer Dabbelt [this message]
2018-08-10  2:40       ` Guenter Roeck
2018-08-10  3:59         ` Palmer Dabbelt
2018-08-10  4:11           ` Guenter Roeck
2018-08-10  4:53           ` Guenter Roeck

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=mhng-80aa1c8e-e2ed-4662-8715-4bb9e6ba7598@palmer-si-x1c4 \ \ \ \ \ \ \ \ \ \ \ \ \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

LKML Archive on

Archives are clonable:
	git clone --mirror lkml/git/0.git
	git clone --mirror lkml/git/1.git
	git clone --mirror lkml/git/2.git
	git clone --mirror lkml/git/3.git
	git clone --mirror lkml/git/4.git
	git clone --mirror lkml/git/5.git
	git clone --mirror lkml/git/6.git
	git clone --mirror lkml/git/7.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 lkml lkml/ \
	public-inbox-index lkml

Newsgroup available over NNTP:

AGPL code for this site: git clone public-inbox