linux-kernel - Re: [PATCH 1/3] tools/memory-model/Documentation: Fix typos in explanation.txt

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Message-ID: <20191001210123.GA41667@google.com>
Date:   Tue, 1 Oct 2019 17:01:23 -0400
From:   Joel Fernandes <joel@...lfernandes.org>
To:     Alan Stern <stern@...land.harvard.edu>
Cc:     LKMM Maintainers -- Akira Yokosawa <akiyks@...il.com>,
        Andrea Parri <parri.andrea@...il.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Daniel Lustig <dlustig@...dia.com>,
        David Howells <dhowells@...hat.com>,
        Jade Alglave <j.alglave@....ac.uk>,
        Luc Maranget <luc.maranget@...ia.fr>,
        Nicholas Piggin <npiggin@...il.com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Will Deacon <will@...nel.org>,
        Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] tools/memory-model/Documentation: Fix typos in
 explanation.txt

On Tue, Oct 01, 2019 at 01:39:47PM -0400, Alan Stern wrote:
> This patch fixes a few minor typos and improves word usage in a few
> places in the Linux Kernel Memory Model's explanation.txt file.
> 
> Signed-off-by: Alan Stern <stern@...land.harvard.edu>
> 

Reviewed-by: Joel Fernandes (Google) <joel@...lfernandes.org>

thanks,

 - Joel


> ---
> 
>  tools/memory-model/Documentation/explanation.txt |   10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> Index: usb-devel/tools/memory-model/Documentation/explanation.txt
> ===================================================================
> --- usb-devel.orig/tools/memory-model/Documentation/explanation.txt
> +++ usb-devel/tools/memory-model/Documentation/explanation.txt
> @@ -206,7 +206,7 @@ goes like this:
>  	P0 stores 1 to buf before storing 1 to flag, since it executes
>  	its instructions in order.
>  
> -	Since an instruction (in this case, P1's store to flag) cannot
> +	Since an instruction (in this case, P0's store to flag) cannot
>  	execute before itself, the specified outcome is impossible.
>  
>  However, real computer hardware almost never follows the Sequential
> @@ -419,7 +419,7 @@ example:
>  
>  The object code might call f(5) either before or after g(6); the
>  memory model cannot assume there is a fixed program order relation
> -between them.  (In fact, if the functions are inlined then the
> +between them.  (In fact, if the function calls are inlined then the
>  compiler might even interleave their object code.)
>  
>  
> @@ -499,7 +499,7 @@ different CPUs (external reads-from, or
>  
>  For our purposes, a memory location's initial value is treated as
>  though it had been written there by an imaginary initial store that
> -executes on a separate CPU before the program runs.
> +executes on a separate CPU before the main program runs.
>  
>  Usage of the rf relation implicitly assumes that loads will always
>  read from a single store.  It doesn't apply properly in the presence
> @@ -955,7 +955,7 @@ atomic update.  This is what the LKMM's
>  THE PRESERVED PROGRAM ORDER RELATION: ppo
>  -----------------------------------------
>  
> -There are many situations where a CPU is obligated to execute two
> +There are many situations where a CPU is obliged to execute two
>  instructions in program order.  We amalgamate them into the ppo (for
>  "preserved program order") relation, which links the po-earlier
>  instruction to the po-later instruction and is thus a sub-relation of
> @@ -1572,7 +1572,7 @@ and there are events X, Y and a read-sid
>  
>  	2. X comes "before" Y in some sense (including rfe, co and fr);
>  
> -	2. Y is po-before Z;
> +	3. Y is po-before Z;
>  
>  	4. Z is the rcu_read_unlock() event marking the end of C;
>  
> 
>