linux-kernel - Re: [PATCH next 3/4] blk-mq: user (1 << order) to implement order_to

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Date:	Sat, 19 Apr 2014 11:17:21 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Jörg-Volker Peetz <jvpeetz@....de>
Cc:	Jens Axboe <axboe@...nel.dk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@....de>
Subject: Re: [PATCH next 3/4] blk-mq: user (1 << order) to implement order_to_size()

On Sat, Apr 19, 2014 at 3:23 AM, Jörg-Volker Peetz <jvpeetz@....de> wrote:
>
> Testing this with gcc 4.8.2 with order > 30 confirms that the automatic casting
> is done operator-wise and the explicit casting is necessary.

My gcc 4.8.2 doesn't complain the change, see below:

ming@...g:~/ming/linux$ gcc --version
gcc (Ubuntu/Linaro 4.8.2-19ubuntu1) 4.8.2

ming@...g:~/ming/linux$
ming@...g:~/ming/linux$ vim block/blk-mq.c
ming@...g:~/ming/linux$ ./build
  CHK     include/config/kernel.release
  CHK     include/generated/uapi/linux/version.h
  CHK     include/generated/utsrelease.h
  CALL    scripts/checksyscalls.sh
  CHK     include/generated/compile.h
  CC      block/blk-mq.o
  CHK     kernel/config_data.h
  LD      block/built-in.o
  LINK    vmlinux
  LD      vmlinux.o
  MODPOST vmlinux.o



Thanks,
-- 
Ming Lei
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