Btrfs devel - Nov 2012 - fs/btrfs/dev-replace.c:486:17: sparse: incompatible types in comparison expression (different address spaces)

Hi Stefan,

FYI, there are new sparse warnings show up in

tree:   git://git.kernel.org/pub/scm/linux/kernel/git/josef/btrfs-next.git
master
head:   c1014be59ba93855c31fda9d9cf4319cc6f9eeb1
commit: d8e784f51e2e1d1c57f091fdb49456c4e7fb62d2 Btrfs: add a new source file
with device replace code
date:   21 hours ago

+ fs/btrfs/dev-replace.c:486:17: sparse: incompatible types in comparison
expression (different address spaces)
+ fs/btrfs/dev-replace.c:486:17: sparse: incompatible types in comparison
expression (different address spaces)
fs/btrfs/dev-replace.c:745:17: sparse: incompatible types in comparison
expression (different address spaces)
fs/btrfs/dev-replace.c:745:17: sparse: incompatible types in comparison
expression (different address spaces)
fs/btrfs/dev-replace.c:766:30: sparse: too many arguments for function
btrfs_scrub_dev
fs/btrfs/dev-replace.c:407:30: sparse: too many arguments for function
btrfs_scrub_dev
fs/btrfs/dev-replace.c: In function ''btrfs_init_dev_replace'':
fs/btrfs/dev-replace.c:141:8: error: ''BTRFS_DEV_REPLACE_DEVID''
undeclared (first use in this function)
fs/btrfs/dev-replace.c:141:8: note: each undeclared identifier is reported only
once for each function it appears in
fs/btrfs/dev-replace.c:168:23: error: ''struct btrfs_device''
has no member named ''is_tgtdev_for_dev_replace''
fs/btrfs/dev-replace.c:169:4: error: implicit declaration of function
''btrfs_init_dev_replace_tgtdev_for_resume''
[-Werror=implicit-function-declaration]
fs/btrfs/dev-replace.c: In function ''btrfs_dev_replace_start'':
fs/btrfs/dev-replace.c:331:2: error: implicit declaration of function
''btrfs_init_dev_replace_tgtdev''
[-Werror=implicit-function-declaration]
fs/btrfs/dev-replace.c:409:10: error: too many arguments to function
''btrfs_scrub_dev''
In file included from fs/btrfs/dev-replace.c:30:0:
fs/btrfs/ctree.h:3648:5: note: declared here
fs/btrfs/dev-replace.c:422:3: error: implicit declaration of function
''btrfs_destroy_dev_replace_tgtdev''
[-Werror=implicit-function-declaration]
fs/btrfs/dev-replace.c: In function
''btrfs_dev_replace_finishing'':
fs/btrfs/dev-replace.c:500:12: error: ''struct btrfs_device''
has no member named ''is_tgtdev_for_dev_replace''
fs/btrfs/dev-replace.c:502:22: error:
''BTRFS_DEV_REPLACE_DEVID'' undeclared (first use in this
function)
fs/btrfs/dev-replace.c:516:2: error: implicit declaration of function
''btrfs_rm_dev_replace_srcdev''
[-Werror=implicit-function-declaration]
fs/btrfs/dev-replace.c: In function
''btrfs_resume_dev_replace_async'':
fs/btrfs/dev-replace.c:726:2: error: ''struct btrfs_fs_info''
has no member named ''mutually_exclusive_operation_running''
fs/btrfs/dev-replace.c: In function
''btrfs_dev_replace_kthread'':
fs/btrfs/dev-replace.c:756:21: error: ''struct btrfs_fs_info''
has no member named ''mutually_exclusive_operation_running''
fs/btrfs/dev-replace.c: In function
''btrfs_dev_replace_continue_on_mount'':
fs/btrfs/dev-replace.c:769:10: error: too many arguments to function
''btrfs_scrub_dev''
In file included from fs/btrfs/dev-replace.c:30:0:
fs/btrfs/ctree.h:3648:5: note: declared here
cc1: some warnings being treated as errors

vim +486 fs/btrfs/dev-replace.c

d8e784f5 Stefan Behrens 2012-11-05  470  	}
d8e784f5 Stefan Behrens 2012-11-05  471  	ret = btrfs_commit_transaction(trans,
root);
d8e784f5 Stefan Behrens 2012-11-05  472  	WARN_ON(ret);
d8e784f5 Stefan Behrens 2012-11-05  473  
d8e784f5 Stefan Behrens 2012-11-05  474  	/* keep away write_all_supers() during
the finishing procedure */
d8e784f5 Stefan Behrens 2012-11-05  475  
mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
d8e784f5 Stefan Behrens 2012-11-05  476  	btrfs_dev_replace_lock(dev_replace);
d8e784f5 Stefan Behrens 2012-11-05  477  	dev_replace->replace_state d8e784f5
Stefan Behrens 2012-11-05  478  		scrub_ret ?
BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED
d8e784f5 Stefan Behrens 2012-11-05  479  			  :
BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED;
d8e784f5 Stefan Behrens 2012-11-05  480  	dev_replace->tgtdev = NULL;
d8e784f5 Stefan Behrens 2012-11-05  481  	dev_replace->srcdev = NULL;
d8e784f5 Stefan Behrens 2012-11-05  482  	dev_replace->time_stopped =
btrfs_get_seconds_since_1970();
d8e784f5 Stefan Behrens 2012-11-05  483  	dev_replace->item_needs_writeback =
1;
d8e784f5 Stefan Behrens 2012-11-05  484  
d8e784f5 Stefan Behrens 2012-11-05  485  	if (scrub_ret) {
d8e784f5 Stefan Behrens 2012-11-05 @486  		printk_in_rcu(KERN_ERR
d8e784f5 Stefan Behrens 2012-11-05  487  			      "btrfs:
btrfs_scrub_dev(%s, %llu, %s) failed %d\n",
d8e784f5 Stefan Behrens 2012-11-05  488  			     
rcu_str_deref(src_device->name),
d8e784f5 Stefan Behrens 2012-11-05  489  			      src_device->devid,
d8e784f5 Stefan Behrens 2012-11-05  490  			     
rcu_str_deref(tgt_device->name), scrub_ret);
d8e784f5 Stefan Behrens 2012-11-05  491  	
btrfs_dev_replace_unlock(dev_replace);
d8e784f5 Stefan Behrens 2012-11-05  492  	
mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
d8e784f5 Stefan Behrens 2012-11-05  493  		if (tgt_device)
d8e784f5 Stefan Behrens 2012-11-05  494  		
btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device);

---
0-DAY kernel build testing backend         Open Source Technology Center
Fengguang Wu, Yuanhan Liu                              Intel Corporation
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On Thu, 8 Nov 2012 15:35:41 +0800, Fengguang Wu wrote:
> Hi Stefan,
> 
> FYI, there are new sparse warnings show up in
> 
> tree:   git://git.kernel.org/pub/scm/linux/kernel/git/josef/btrfs-next.git
master
> head:   c1014be59ba93855c31fda9d9cf4319cc6f9eeb1
> commit: d8e784f51e2e1d1c57f091fdb49456c4e7fb62d2 Btrfs: add a new source
file with device replace code
> date:   21 hours ago
> 
> + fs/btrfs/dev-replace.c:486:17: sparse: incompatible types in comparison
expression (different address spaces)
> + fs/btrfs/dev-replace.c:486:17: sparse: incompatible types in comparison
expression (different address spaces)
> fs/btrfs/dev-replace.c:745:17: sparse: incompatible types in comparison
expression (different address spaces)
> fs/btrfs/dev-replace.c:745:17: sparse: incompatible types in comparison
expression (different address spaces)
> fs/btrfs/dev-replace.c:766:30: sparse: too many arguments for function
btrfs_scrub_dev
> fs/btrfs/dev-replace.c:407:30: sparse: too many arguments for function
btrfs_scrub_dev
> fs/btrfs/dev-replace.c: In function
''btrfs_init_dev_replace'':
> fs/btrfs/dev-replace.c:141:8: error:
''BTRFS_DEV_REPLACE_DEVID'' undeclared (first use in this
function)
> fs/btrfs/dev-replace.c:141:8: note: each undeclared identifier is reported
only once for each function it appears in
> fs/btrfs/dev-replace.c:168:23: error: ''struct
btrfs_device'' has no member named
''is_tgtdev_for_dev_replace''
> fs/btrfs/dev-replace.c:169:4: error: implicit declaration of function
''btrfs_init_dev_replace_tgtdev_for_resume''
[-Werror=implicit-function-declaration]
> fs/btrfs/dev-replace.c: In function
''btrfs_dev_replace_start'':
> fs/btrfs/dev-replace.c:331:2: error: implicit declaration of function
''btrfs_init_dev_replace_tgtdev''
[-Werror=implicit-function-declaration]
> fs/btrfs/dev-replace.c:409:10: error: too many arguments to function
''btrfs_scrub_dev''
> In file included from fs/btrfs/dev-replace.c:30:0:
> fs/btrfs/ctree.h:3648:5: note: declared here
> fs/btrfs/dev-replace.c:422:3: error: implicit declaration of function
''btrfs_destroy_dev_replace_tgtdev''
[-Werror=implicit-function-declaration]
> fs/btrfs/dev-replace.c: In function
''btrfs_dev_replace_finishing'':
> fs/btrfs/dev-replace.c:500:12: error: ''struct
btrfs_device'' has no member named
''is_tgtdev_for_dev_replace''
> fs/btrfs/dev-replace.c:502:22: error:
''BTRFS_DEV_REPLACE_DEVID'' undeclared (first use in this
function)
> fs/btrfs/dev-replace.c:516:2: error: implicit declaration of function
''btrfs_rm_dev_replace_srcdev''
[-Werror=implicit-function-declaration]
> fs/btrfs/dev-replace.c: In function
''btrfs_resume_dev_replace_async'':
> fs/btrfs/dev-replace.c:726:2: error: ''struct
btrfs_fs_info'' has no member named
''mutually_exclusive_operation_running''
> fs/btrfs/dev-replace.c: In function
''btrfs_dev_replace_kthread'':
> fs/btrfs/dev-replace.c:756:21: error: ''struct
btrfs_fs_info'' has no member named
''mutually_exclusive_operation_running''
> fs/btrfs/dev-replace.c: In function
''btrfs_dev_replace_continue_on_mount'':
> fs/btrfs/dev-replace.c:769:10: error: too many arguments to function
''btrfs_scrub_dev''
> In file included from fs/btrfs/dev-replace.c:30:0:
> fs/btrfs/ctree.h:3648:5: note: declared here
> cc1: some warnings being treated as errors
> 
> vim +486 fs/btrfs/dev-replace.c
> 
> d8e784f5 Stefan Behrens 2012-11-05  470  	}
> d8e784f5 Stefan Behrens 2012-11-05  471  	ret =
btrfs_commit_transaction(trans, root);
> d8e784f5 Stefan Behrens 2012-11-05  472  	WARN_ON(ret);
> d8e784f5 Stefan Behrens 2012-11-05  473  
> d8e784f5 Stefan Behrens 2012-11-05  474  	/* keep away write_all_supers()
during the finishing procedure */
> d8e784f5 Stefan Behrens 2012-11-05  475  
mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
> d8e784f5 Stefan Behrens 2012-11-05  476  
btrfs_dev_replace_lock(dev_replace);
> d8e784f5 Stefan Behrens 2012-11-05  477  	dev_replace->replace_state
> d8e784f5 Stefan Behrens 2012-11-05  478  		scrub_ret ?
BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED
> d8e784f5 Stefan Behrens 2012-11-05  479  			  :
BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED;
> d8e784f5 Stefan Behrens 2012-11-05  480  	dev_replace->tgtdev = NULL;
> d8e784f5 Stefan Behrens 2012-11-05  481  	dev_replace->srcdev = NULL;
> d8e784f5 Stefan Behrens 2012-11-05  482  	dev_replace->time_stopped =
btrfs_get_seconds_since_1970();
> d8e784f5 Stefan Behrens 2012-11-05  483  
dev_replace->item_needs_writeback = 1;
> d8e784f5 Stefan Behrens 2012-11-05  484  
> d8e784f5 Stefan Behrens 2012-11-05  485  	if (scrub_ret) {
> d8e784f5 Stefan Behrens 2012-11-05 @486  		printk_in_rcu(KERN_ERR
> d8e784f5 Stefan Behrens 2012-11-05  487  			      "btrfs:
btrfs_scrub_dev(%s, %llu, %s) failed %d\n",
> d8e784f5 Stefan Behrens 2012-11-05  488  			     
rcu_str_deref(src_device->name),
> d8e784f5 Stefan Behrens 2012-11-05  489  			      src_device->devid,
> d8e784f5 Stefan Behrens 2012-11-05  490  			     
rcu_str_deref(tgt_device->name), scrub_ret);
> d8e784f5 Stefan Behrens 2012-11-05  491  	
btrfs_dev_replace_unlock(dev_replace);
> d8e784f5 Stefan Behrens 2012-11-05  492  	
mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
> d8e784f5 Stefan Behrens 2012-11-05  493  		if (tgt_device)
> d8e784f5 Stefan Behrens 2012-11-05  494  		
btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device);
> 
Hi Fengguang,

Assuming that your script performs a periodic git fetch and git reset,
and then starts compile runs on different architectures, the only
explanation that I have is that something went wrong with the git
operation in your script. It looks like some C source files have been
updated, but the header files are old. Some kind of inconsistency that
either a git reset --hard should fix, or rm -rf . and git clone to start
from the beginning.

Could you check it please?

And could you please point me to some documentation, how this (very
useful !) service from Intel is working?

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> Hi Fengguang,
 
Hi Stefan!
> Assuming that your script performs a periodic git fetch and git reset,
> and then starts compile runs on different architectures, the only
> explanation that I have is that something went wrong with the git
> operation in your script. It looks like some C source files have been
> updated, but the header files are old. Some kind of inconsistency that
> either a git reset --hard should fix, or rm -rf . and git clone to start
> from the beginning.
> 
> Could you check it please?
That''s definitely good suggestion! I''ve added the check before
each make
to make sure the tree is in a clean state:

git_check_reset()
{       
        [[ $(git --no-pager diff) ]] && {
                notice "unexpected modified work tree"
                dump_stack
                git --no-pager diff
                git reset --hard
        }
}       
> And could you please point me to some documentation, how this (very
> useful !) service from Intel is working?
Sure (and thanks!). Here is a nice article:

KS2012: Kernel build/boot testing
https://lwn.net/Articles/514278/

Thanks,
Fengguang
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On Thu, 8 Nov 2012 15:35:41 +0800, Fengguang Wu wrote:
> Hi Stefan,
> 
> FYI, there are new sparse warnings show up in
> 
> tree:   git://git.kernel.org/pub/scm/linux/kernel/git/josef/btrfs-next.git
master
> head:   c1014be59ba93855c31fda9d9cf4319cc6f9eeb1
> commit: d8e784f51e2e1d1c57f091fdb49456c4e7fb62d2 Btrfs: add a new source
file with device replace code
> date:   21 hours ago
> 
> + fs/btrfs/dev-replace.c:486:17: sparse: incompatible types in comparison
expression (different address spaces)
> + fs/btrfs/dev-replace.c:486:17: sparse: incompatible types in comparison
expression (different address spaces)
> fs/btrfs/dev-replace.c:745:17: sparse: incompatible types in comparison
expression (different address spaces)
> fs/btrfs/dev-replace.c:745:17: sparse: incompatible types in comparison
expression (different address spaces)
> fs/btrfs/dev-replace.c:766:30: sparse: too many arguments for function
btrfs_scrub_dev
> fs/btrfs/dev-replace.c:407:30: sparse: too many arguments for function
btrfs_scrub_dev
> fs/btrfs/dev-replace.c: In function
''btrfs_init_dev_replace'':
> fs/btrfs/dev-replace.c:141:8: error:
''BTRFS_DEV_REPLACE_DEVID'' undeclared (first use in this
function)
> fs/btrfs/dev-replace.c:141:8: note: each undeclared identifier is reported
only once for each function it appears in
> fs/btrfs/dev-replace.c:168:23: error: ''struct
btrfs_device'' has no member named
''is_tgtdev_for_dev_replace''
> fs/btrfs/dev-replace.c:169:4: error: implicit declaration of function
''btrfs_init_dev_replace_tgtdev_for_resume''
[-Werror=implicit-function-declaration]
> fs/btrfs/dev-replace.c: In function
''btrfs_dev_replace_start'':
> fs/btrfs/dev-replace.c:331:2: error: implicit declaration of function
''btrfs_init_dev_replace_tgtdev''
[-Werror=implicit-function-declaration]
> fs/btrfs/dev-replace.c:409:10: error: too many arguments to function
''btrfs_scrub_dev''
> In file included from fs/btrfs/dev-replace.c:30:0:
> fs/btrfs/ctree.h:3648:5: note: declared here
> fs/btrfs/dev-replace.c:422:3: error: implicit declaration of function
''btrfs_destroy_dev_replace_tgtdev''
[-Werror=implicit-function-declaration]
> fs/btrfs/dev-replace.c: In function
''btrfs_dev_replace_finishing'':
> fs/btrfs/dev-replace.c:500:12: error: ''struct
btrfs_device'' has no member named
''is_tgtdev_for_dev_replace''
> fs/btrfs/dev-replace.c:502:22: error:
''BTRFS_DEV_REPLACE_DEVID'' undeclared (first use in this
function)
> fs/btrfs/dev-replace.c:516:2: error: implicit declaration of function
''btrfs_rm_dev_replace_srcdev''
[-Werror=implicit-function-declaration]
> fs/btrfs/dev-replace.c: In function
''btrfs_resume_dev_replace_async'':
> fs/btrfs/dev-replace.c:726:2: error: ''struct
btrfs_fs_info'' has no member named
''mutually_exclusive_operation_running''
> fs/btrfs/dev-replace.c: In function
''btrfs_dev_replace_kthread'':
> fs/btrfs/dev-replace.c:756:21: error: ''struct
btrfs_fs_info'' has no member named
''mutually_exclusive_operation_running''
> fs/btrfs/dev-replace.c: In function
''btrfs_dev_replace_continue_on_mount'':
> fs/btrfs/dev-replace.c:769:10: error: too many arguments to function
''btrfs_scrub_dev''
[...]

My fault.

After reading, how the 0-day kernel build testing is working, it is
clear, what the error is.

This problematic commit adds a source file with full C code contents,
but does not add the file to the Makefile yet. The sparse tool checks it
anyway since it seems to be invoked for every *.c file ignoring that the
file is not yet included in the build.

This behavior of the kernel build testing is fine. There are pros and
cons, but finally I think that it is not a good idea to create such a
commit as I did it.

The goal was to avoid huge commits that nobody would ever review, and
that nobody could ever review. Therefore I thought it would simplify
reading the patches and understanding the purpose of the modifications,
if I make it a step of its own to add all these new dev-replace.c
functions. This allows to keep the commit "change core code of btrfs to
support the device replace operation" small and contain only the changes
to the legacy files.

I now changed it to add the new source file to the Makefile in the same
commit that added the C source file, and made it build without errors.
This meant to move the commit upwards in the list of commits, and to
also move some changes from one commit to the other. At the end, the
commit "change core code of btrfs to support the device replace
operation" is even smaller, and the changed commits are even more
readable. For me, this is a proof that this is the better way :)

Thanks for the 0-day kernel build testing!

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