linux-kernel - Re: [PATCH v8 1/3] rseq/membarrier: add MEMBARRIER_CMD_PRIVATE_EXPEDITED

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Message-ID: <20200925115040.GZ2628@hirez.programming.kicks-ass.net>
Date:   Fri, 25 Sep 2020 13:50:40 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Peter Oskolkov <posk@...gle.com>
Cc:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Boqun Feng <boqun.feng@...il.com>,
        linux-kernel@...r.kernel.org, Paul Turner <pjt@...gle.com>,
        Chris Kennelly <ckennelly@...gle.com>,
        Peter Oskolkov <posk@...k.io>, Shuah Khan <shuah@...nel.org>,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v8 1/3] rseq/membarrier: add
 MEMBARRIER_CMD_PRIVATE_EXPEDITED_RSEQ

On Wed, Sep 23, 2020 at 04:36:16PM -0700, Peter Oskolkov wrote:
> --- a/include/linux/syscalls.h
> +++ b/include/linux/syscalls.h
> @@ -974,7 +974,7 @@ asmlinkage long sys_execveat(int dfd, const char __user *filename,
>  			const char __user *const __user *argv,
>  			const char __user *const __user *envp, int flags);
>  asmlinkage long sys_userfaultfd(int flags);
> -asmlinkage long sys_membarrier(int cmd, int flags);
> +asmlinkage long sys_membarrier(int cmd, int flags, int cpu_id);
>  asmlinkage long sys_mlock2(unsigned long start, size_t len, int flags);
>  asmlinkage long sys_copy_file_range(int fd_in, loff_t __user *off_in,
>  				    int fd_out, loff_t __user *off_out,

The below is required to make arm build... I'll update the patch and
push out again.

diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 466c993e52bf..06db09875aa4 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -974,7 +974,7 @@ asmlinkage long sys_execveat(int dfd, const char __user *filename,
 			const char __user *const __user *argv,
 			const char __user *const __user *envp, int flags);
 asmlinkage long sys_userfaultfd(int flags);
-asmlinkage long sys_membarrier(int cmd, int flags, int cpu_id);
+asmlinkage long sys_membarrier(int cmd, unsigned int flags, int cpu_id);
 asmlinkage long sys_mlock2(unsigned long start, size_t len, int flags);
 asmlinkage long sys_copy_file_range(int fd_in, loff_t __user *off_in,
 				    int fd_out, loff_t __user *off_out,