* Re: [PATCH] staging: android: ashmem: used const keyword
2020-07-28 17:59 [PATCH] staging: android: ashmem: used const keyword Dhiraj Sharma
@ 2020-07-28 18:04 ` Joe Perches
2020-07-28 18:25 ` Greg KH
` (3 subsequent siblings)
4 siblings, 0 replies; 7+ messages in thread
From: Joe Perches @ 2020-07-28 18:04 UTC (permalink / raw)
To: Dhiraj Sharma, gregkh, arve, tkjos, maco, joel, christian,
hridya, surenb
Cc: devel, linux-kernel
On Tue, 2020-07-28 at 23:29 +0530, Dhiraj Sharma wrote:
> I ran checkpatch.pl script which reported a warning to use const keyword
> on line 370.Therefore I made this change.
checkpatch is a brainless script.
Not everything it suggests is appropriate.
> diff --git a/drivers/staging/android/ashmem.c b/drivers/staging/android/ashmem.c
[]
> @@ -367,7 +367,7 @@ ashmem_vmfile_get_unmapped_area(struct file *file, unsigned long addr,
>
> static int ashmem_mmap(struct file *file, struct vm_area_struct *vma)
> {
> - static struct file_operations vmfile_fops;
> + static const struct file_operations vmfile_fops;
This can't work.
Please make sure to compile your proposed changes
_before_ you post them.
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^ permalink raw reply [flat|nested] 7+ messages in thread* Re: [PATCH] staging: android: ashmem: used const keyword
2020-07-28 17:59 [PATCH] staging: android: ashmem: used const keyword Dhiraj Sharma
2020-07-28 18:04 ` Joe Perches
@ 2020-07-28 18:25 ` Greg KH
2020-07-28 18:35 ` Dhiraj Sharma
2020-07-29 21:31 ` kernel test robot
` (2 subsequent siblings)
4 siblings, 1 reply; 7+ messages in thread
From: Greg KH @ 2020-07-28 18:25 UTC (permalink / raw)
To: Dhiraj Sharma
Cc: devel, tkjos, surenb, linux-kernel, hridya, arve, joel, maco, christian
On Tue, Jul 28, 2020 at 11:29:35PM +0530, Dhiraj Sharma wrote:
> I ran checkpatch.pl script which reported a warning to use const keyword
> on line 370.Therefore I made this change.
>
> Signed-off-by: Dhiraj Sharma <dhiraj.sharma0024@gmail.com>
> ---
> drivers/staging/android/ashmem.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/staging/android/ashmem.c b/drivers/staging/android/ashmem.c
> index c05a214191da..f9cfa15b785f 100644
> --- a/drivers/staging/android/ashmem.c
> +++ b/drivers/staging/android/ashmem.c
> @@ -367,7 +367,7 @@ ashmem_vmfile_get_unmapped_area(struct file *file, unsigned long addr,
>
> static int ashmem_mmap(struct file *file, struct vm_area_struct *vma)
> {
> - static struct file_operations vmfile_fops;
> + static const struct file_operations vmfile_fops;
You have now submitted two patches that you obviously never even built,
which is the first step in kernel development :(
Please be more careful next time.
greg k-h
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^ permalink raw reply [flat|nested] 7+ messages in thread* Re: [PATCH] staging: android: ashmem: used const keyword
2020-07-28 18:25 ` Greg KH
@ 2020-07-28 18:35 ` Dhiraj Sharma
0 siblings, 0 replies; 7+ messages in thread
From: Dhiraj Sharma @ 2020-07-28 18:35 UTC (permalink / raw)
To: Greg KH
Cc: devel, tkjos, Suren Baghdasaryan, linux-kernel, Hridya Valsaraju,
arve, joel, maco, christian
Alright, I have understood now that I should not trust on
checkpatch.pl script fully but partially it is indeed helpful. Please
don't criticize this script, it was my fault instead.
Before submitting code changes I would test them all, sorry for
wasting your time please ignore this patch changes now.
I will not commit such foolish mistakes now.
Thank you
Dhiraj Sharma
On Tue, Jul 28, 2020 at 11:55 PM Greg KH <gregkh@linuxfoundation.org> wrote:
>
> On Tue, Jul 28, 2020 at 11:29:35PM +0530, Dhiraj Sharma wrote:
> > I ran checkpatch.pl script which reported a warning to use const keyword
> > on line 370.Therefore I made this change.
> >
> > Signed-off-by: Dhiraj Sharma <dhiraj.sharma0024@gmail.com>
> > ---
> > drivers/staging/android/ashmem.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/staging/android/ashmem.c b/drivers/staging/android/ashmem.c
> > index c05a214191da..f9cfa15b785f 100644
> > --- a/drivers/staging/android/ashmem.c
> > +++ b/drivers/staging/android/ashmem.c
> > @@ -367,7 +367,7 @@ ashmem_vmfile_get_unmapped_area(struct file *file, unsigned long addr,
> >
> > static int ashmem_mmap(struct file *file, struct vm_area_struct *vma)
> > {
> > - static struct file_operations vmfile_fops;
> > + static const struct file_operations vmfile_fops;
>
> You have now submitted two patches that you obviously never even built,
> which is the first step in kernel development :(
>
> Please be more careful next time.
>
> greg k-h
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^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] staging: android: ashmem: used const keyword
2020-07-28 17:59 [PATCH] staging: android: ashmem: used const keyword Dhiraj Sharma
2020-07-28 18:04 ` Joe Perches
2020-07-28 18:25 ` Greg KH
@ 2020-07-29 21:31 ` kernel test robot
2020-07-29 21:45 ` kernel test robot
2020-08-05 8:43 ` kernel test robot
4 siblings, 0 replies; 7+ messages in thread
From: kernel test robot @ 2020-07-29 21:31 UTC (permalink / raw)
To: Dhiraj Sharma, gregkh, arve, tkjos, maco, joel, christian,
hridya, surenb
Cc: devel, Dhiraj Sharma, kbuild-all
[-- Attachment #1: Type: text/plain, Size: 7833 bytes --]
Hi Dhiraj,
Thank you for the patch! Yet something to improve:
[auto build test ERROR on staging/staging-testing]
url: https://github.com/0day-ci/linux/commits/Dhiraj-Sharma/staging-android-ashmem-used-const-keyword/20200729-020222
base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git 11536442a3b4e1de6890ea5e805908debb74f94a
config: i386-randconfig-r012-20200729 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-14) 9.3.0
reproduce (this is a W=1 build):
# save the attached .config to linux build tree
make W=1 ARCH=i386
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
All errors (new ones prefixed by >>):
drivers/staging/android/ashmem.c: In function 'ashmem_mmap':
>> drivers/staging/android/ashmem.c:418:16: error: assignment of read-only variable 'vmfile_fops'
418 | vmfile_fops = *vmfile->f_op;
| ^
>> drivers/staging/android/ashmem.c:419:21: error: assignment of member 'mmap' in read-only object
419 | vmfile_fops.mmap = ashmem_vmfile_mmap;
| ^
>> drivers/staging/android/ashmem.c:420:34: error: assignment of member 'get_unmapped_area' in read-only object
420 | vmfile_fops.get_unmapped_area =
| ^
vim +/vmfile_fops +418 drivers/staging/android/ashmem.c
6d67b0290b4b84c Suren Baghdasaryan 2020-01-27 367
11980c2ac4ccfad Robert Love 2011-12-20 368 static int ashmem_mmap(struct file *file, struct vm_area_struct *vma)
11980c2ac4ccfad Robert Love 2011-12-20 369 {
e200c35fc32789d Dhiraj Sharma 2020-07-28 370 static const struct file_operations vmfile_fops;
11980c2ac4ccfad Robert Love 2011-12-20 371 struct ashmem_area *asma = file->private_data;
11980c2ac4ccfad Robert Love 2011-12-20 372 int ret = 0;
11980c2ac4ccfad Robert Love 2011-12-20 373
11980c2ac4ccfad Robert Love 2011-12-20 374 mutex_lock(&ashmem_mutex);
11980c2ac4ccfad Robert Love 2011-12-20 375
11980c2ac4ccfad Robert Love 2011-12-20 376 /* user needs to SET_SIZE before mapping */
59848d6aded59a6 Alistair Strachan 2018-06-19 377 if (!asma->size) {
11980c2ac4ccfad Robert Love 2011-12-20 378 ret = -EINVAL;
11980c2ac4ccfad Robert Love 2011-12-20 379 goto out;
11980c2ac4ccfad Robert Love 2011-12-20 380 }
11980c2ac4ccfad Robert Love 2011-12-20 381
8632c614565d0c5 Alistair Strachan 2018-06-19 382 /* requested mapping size larger than object size */
8632c614565d0c5 Alistair Strachan 2018-06-19 383 if (vma->vm_end - vma->vm_start > PAGE_ALIGN(asma->size)) {
11980c2ac4ccfad Robert Love 2011-12-20 384 ret = -EINVAL;
11980c2ac4ccfad Robert Love 2011-12-20 385 goto out;
11980c2ac4ccfad Robert Love 2011-12-20 386 }
11980c2ac4ccfad Robert Love 2011-12-20 387
11980c2ac4ccfad Robert Love 2011-12-20 388 /* requested protection bits must match our allowed protection mask */
59848d6aded59a6 Alistair Strachan 2018-06-19 389 if ((vma->vm_flags & ~calc_vm_prot_bits(asma->prot_mask, 0)) &
59848d6aded59a6 Alistair Strachan 2018-06-19 390 calc_vm_prot_bits(PROT_MASK, 0)) {
11980c2ac4ccfad Robert Love 2011-12-20 391 ret = -EPERM;
11980c2ac4ccfad Robert Love 2011-12-20 392 goto out;
11980c2ac4ccfad Robert Love 2011-12-20 393 }
56f76fc68492af7 Arve Hjønnevåg 2011-12-20 394 vma->vm_flags &= ~calc_vm_may_flags(~asma->prot_mask);
11980c2ac4ccfad Robert Love 2011-12-20 395
11980c2ac4ccfad Robert Love 2011-12-20 396 if (!asma->file) {
11980c2ac4ccfad Robert Love 2011-12-20 397 char *name = ASHMEM_NAME_DEF;
11980c2ac4ccfad Robert Love 2011-12-20 398 struct file *vmfile;
11980c2ac4ccfad Robert Love 2011-12-20 399
11980c2ac4ccfad Robert Love 2011-12-20 400 if (asma->name[ASHMEM_NAME_PREFIX_LEN] != '\0')
11980c2ac4ccfad Robert Love 2011-12-20 401 name = asma->name;
11980c2ac4ccfad Robert Love 2011-12-20 402
11980c2ac4ccfad Robert Love 2011-12-20 403 /* ... and allocate the backing shmem file */
11980c2ac4ccfad Robert Love 2011-12-20 404 vmfile = shmem_file_setup(name, asma->size, vma->vm_flags);
7f44cb0ba88b40c Viresh Kumar 2015-07-31 405 if (IS_ERR(vmfile)) {
11980c2ac4ccfad Robert Love 2011-12-20 406 ret = PTR_ERR(vmfile);
11980c2ac4ccfad Robert Love 2011-12-20 407 goto out;
11980c2ac4ccfad Robert Love 2011-12-20 408 }
97fbfef6bd59788 Shuxiao Zhang 2017-04-06 409 vmfile->f_mode |= FMODE_LSEEK;
11980c2ac4ccfad Robert Love 2011-12-20 410 asma->file = vmfile;
6d67b0290b4b84c Suren Baghdasaryan 2020-01-27 411 /*
6d67b0290b4b84c Suren Baghdasaryan 2020-01-27 412 * override mmap operation of the vmfile so that it can't be
6d67b0290b4b84c Suren Baghdasaryan 2020-01-27 413 * remapped which would lead to creation of a new vma with no
6d67b0290b4b84c Suren Baghdasaryan 2020-01-27 414 * asma permission checks. Have to override get_unmapped_area
6d67b0290b4b84c Suren Baghdasaryan 2020-01-27 415 * as well to prevent VM_BUG_ON check for f_ops modification.
6d67b0290b4b84c Suren Baghdasaryan 2020-01-27 416 */
6d67b0290b4b84c Suren Baghdasaryan 2020-01-27 417 if (!vmfile_fops.mmap) {
6d67b0290b4b84c Suren Baghdasaryan 2020-01-27 @418 vmfile_fops = *vmfile->f_op;
6d67b0290b4b84c Suren Baghdasaryan 2020-01-27 @419 vmfile_fops.mmap = ashmem_vmfile_mmap;
6d67b0290b4b84c Suren Baghdasaryan 2020-01-27 @420 vmfile_fops.get_unmapped_area =
6d67b0290b4b84c Suren Baghdasaryan 2020-01-27 421 ashmem_vmfile_get_unmapped_area;
6d67b0290b4b84c Suren Baghdasaryan 2020-01-27 422 }
6d67b0290b4b84c Suren Baghdasaryan 2020-01-27 423 vmfile->f_op = &vmfile_fops;
11980c2ac4ccfad Robert Love 2011-12-20 424 }
11980c2ac4ccfad Robert Love 2011-12-20 425 get_file(asma->file);
11980c2ac4ccfad Robert Love 2011-12-20 426
11980c2ac4ccfad Robert Love 2011-12-20 427 /*
11980c2ac4ccfad Robert Love 2011-12-20 428 * XXX - Reworked to use shmem_zero_setup() instead of
11980c2ac4ccfad Robert Love 2011-12-20 429 * shmem_set_file while we're in staging. -jstultz
11980c2ac4ccfad Robert Love 2011-12-20 430 */
11980c2ac4ccfad Robert Love 2011-12-20 431 if (vma->vm_flags & VM_SHARED) {
11980c2ac4ccfad Robert Love 2011-12-20 432 ret = shmem_zero_setup(vma);
11980c2ac4ccfad Robert Love 2011-12-20 433 if (ret) {
11980c2ac4ccfad Robert Love 2011-12-20 434 fput(asma->file);
11980c2ac4ccfad Robert Love 2011-12-20 435 goto out;
11980c2ac4ccfad Robert Love 2011-12-20 436 }
44960f2a7b63e22 John Stultz 2018-07-31 437 } else {
44960f2a7b63e22 John Stultz 2018-07-31 438 vma_set_anonymous(vma);
11980c2ac4ccfad Robert Love 2011-12-20 439 }
11980c2ac4ccfad Robert Love 2011-12-20 440
11980c2ac4ccfad Robert Love 2011-12-20 441 if (vma->vm_file)
11980c2ac4ccfad Robert Love 2011-12-20 442 fput(vma->vm_file);
11980c2ac4ccfad Robert Love 2011-12-20 443 vma->vm_file = asma->file;
11980c2ac4ccfad Robert Love 2011-12-20 444
11980c2ac4ccfad Robert Love 2011-12-20 445 out:
11980c2ac4ccfad Robert Love 2011-12-20 446 mutex_unlock(&ashmem_mutex);
11980c2ac4ccfad Robert Love 2011-12-20 447 return ret;
11980c2ac4ccfad Robert Love 2011-12-20 448 }
11980c2ac4ccfad Robert Love 2011-12-20 449
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 34445 bytes --]
[-- Attachment #3: Type: text/plain, Size: 169 bytes --]
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^ permalink raw reply [flat|nested] 7+ messages in thread* Re: [PATCH] staging: android: ashmem: used const keyword
2020-07-28 17:59 [PATCH] staging: android: ashmem: used const keyword Dhiraj Sharma
` (2 preceding siblings ...)
2020-07-29 21:31 ` kernel test robot
@ 2020-07-29 21:45 ` kernel test robot
2020-08-05 8:43 ` kernel test robot
4 siblings, 0 replies; 7+ messages in thread
From: kernel test robot @ 2020-07-29 21:45 UTC (permalink / raw)
To: Dhiraj Sharma, gregkh, arve, tkjos, maco, joel, christian,
hridya, surenb
Cc: devel, Dhiraj Sharma, kbuild-all
[-- Attachment #1: Type: text/plain, Size: 8017 bytes --]
Hi Dhiraj,
Thank you for the patch! Yet something to improve:
[auto build test ERROR on staging/staging-testing]
url: https://github.com/0day-ci/linux/commits/Dhiraj-Sharma/staging-android-ashmem-used-const-keyword/20200729-020222
base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git 11536442a3b4e1de6890ea5e805908debb74f94a
config: nds32-allyesconfig (attached as .config)
compiler: nds32le-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=nds32
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
All errors (new ones prefixed by >>):
drivers/staging/android/ashmem.c: In function 'ashmem_mmap':
>> drivers/staging/android/ashmem.c:418:16: error: assignment of read-only variable 'vmfile_fops'
418 | vmfile_fops = *vmfile->f_op;
| ^
>> drivers/staging/android/ashmem.c:419:21: error: assignment of member 'mmap' in read-only object
419 | vmfile_fops.mmap = ashmem_vmfile_mmap;
| ^
>> drivers/staging/android/ashmem.c:420:34: error: assignment of member 'get_unmapped_area' in read-only object
420 | vmfile_fops.get_unmapped_area =
| ^
vim +/vmfile_fops +418 drivers/staging/android/ashmem.c
6d67b0290b4b84c Suren Baghdasaryan 2020-01-27 367
11980c2ac4ccfad Robert Love 2011-12-20 368 static int ashmem_mmap(struct file *file, struct vm_area_struct *vma)
11980c2ac4ccfad Robert Love 2011-12-20 369 {
e200c35fc32789d Dhiraj Sharma 2020-07-28 370 static const struct file_operations vmfile_fops;
11980c2ac4ccfad Robert Love 2011-12-20 371 struct ashmem_area *asma = file->private_data;
11980c2ac4ccfad Robert Love 2011-12-20 372 int ret = 0;
11980c2ac4ccfad Robert Love 2011-12-20 373
11980c2ac4ccfad Robert Love 2011-12-20 374 mutex_lock(&ashmem_mutex);
11980c2ac4ccfad Robert Love 2011-12-20 375
11980c2ac4ccfad Robert Love 2011-12-20 376 /* user needs to SET_SIZE before mapping */
59848d6aded59a6 Alistair Strachan 2018-06-19 377 if (!asma->size) {
11980c2ac4ccfad Robert Love 2011-12-20 378 ret = -EINVAL;
11980c2ac4ccfad Robert Love 2011-12-20 379 goto out;
11980c2ac4ccfad Robert Love 2011-12-20 380 }
11980c2ac4ccfad Robert Love 2011-12-20 381
8632c614565d0c5 Alistair Strachan 2018-06-19 382 /* requested mapping size larger than object size */
8632c614565d0c5 Alistair Strachan 2018-06-19 383 if (vma->vm_end - vma->vm_start > PAGE_ALIGN(asma->size)) {
11980c2ac4ccfad Robert Love 2011-12-20 384 ret = -EINVAL;
11980c2ac4ccfad Robert Love 2011-12-20 385 goto out;
11980c2ac4ccfad Robert Love 2011-12-20 386 }
11980c2ac4ccfad Robert Love 2011-12-20 387
11980c2ac4ccfad Robert Love 2011-12-20 388 /* requested protection bits must match our allowed protection mask */
59848d6aded59a6 Alistair Strachan 2018-06-19 389 if ((vma->vm_flags & ~calc_vm_prot_bits(asma->prot_mask, 0)) &
59848d6aded59a6 Alistair Strachan 2018-06-19 390 calc_vm_prot_bits(PROT_MASK, 0)) {
11980c2ac4ccfad Robert Love 2011-12-20 391 ret = -EPERM;
11980c2ac4ccfad Robert Love 2011-12-20 392 goto out;
11980c2ac4ccfad Robert Love 2011-12-20 393 }
56f76fc68492af7 Arve Hjønnevåg 2011-12-20 394 vma->vm_flags &= ~calc_vm_may_flags(~asma->prot_mask);
11980c2ac4ccfad Robert Love 2011-12-20 395
11980c2ac4ccfad Robert Love 2011-12-20 396 if (!asma->file) {
11980c2ac4ccfad Robert Love 2011-12-20 397 char *name = ASHMEM_NAME_DEF;
11980c2ac4ccfad Robert Love 2011-12-20 398 struct file *vmfile;
11980c2ac4ccfad Robert Love 2011-12-20 399
11980c2ac4ccfad Robert Love 2011-12-20 400 if (asma->name[ASHMEM_NAME_PREFIX_LEN] != '\0')
11980c2ac4ccfad Robert Love 2011-12-20 401 name = asma->name;
11980c2ac4ccfad Robert Love 2011-12-20 402
11980c2ac4ccfad Robert Love 2011-12-20 403 /* ... and allocate the backing shmem file */
11980c2ac4ccfad Robert Love 2011-12-20 404 vmfile = shmem_file_setup(name, asma->size, vma->vm_flags);
7f44cb0ba88b40c Viresh Kumar 2015-07-31 405 if (IS_ERR(vmfile)) {
11980c2ac4ccfad Robert Love 2011-12-20 406 ret = PTR_ERR(vmfile);
11980c2ac4ccfad Robert Love 2011-12-20 407 goto out;
11980c2ac4ccfad Robert Love 2011-12-20 408 }
97fbfef6bd59788 Shuxiao Zhang 2017-04-06 409 vmfile->f_mode |= FMODE_LSEEK;
11980c2ac4ccfad Robert Love 2011-12-20 410 asma->file = vmfile;
6d67b0290b4b84c Suren Baghdasaryan 2020-01-27 411 /*
6d67b0290b4b84c Suren Baghdasaryan 2020-01-27 412 * override mmap operation of the vmfile so that it can't be
6d67b0290b4b84c Suren Baghdasaryan 2020-01-27 413 * remapped which would lead to creation of a new vma with no
6d67b0290b4b84c Suren Baghdasaryan 2020-01-27 414 * asma permission checks. Have to override get_unmapped_area
6d67b0290b4b84c Suren Baghdasaryan 2020-01-27 415 * as well to prevent VM_BUG_ON check for f_ops modification.
6d67b0290b4b84c Suren Baghdasaryan 2020-01-27 416 */
6d67b0290b4b84c Suren Baghdasaryan 2020-01-27 417 if (!vmfile_fops.mmap) {
6d67b0290b4b84c Suren Baghdasaryan 2020-01-27 @418 vmfile_fops = *vmfile->f_op;
6d67b0290b4b84c Suren Baghdasaryan 2020-01-27 @419 vmfile_fops.mmap = ashmem_vmfile_mmap;
6d67b0290b4b84c Suren Baghdasaryan 2020-01-27 @420 vmfile_fops.get_unmapped_area =
6d67b0290b4b84c Suren Baghdasaryan 2020-01-27 421 ashmem_vmfile_get_unmapped_area;
6d67b0290b4b84c Suren Baghdasaryan 2020-01-27 422 }
6d67b0290b4b84c Suren Baghdasaryan 2020-01-27 423 vmfile->f_op = &vmfile_fops;
11980c2ac4ccfad Robert Love 2011-12-20 424 }
11980c2ac4ccfad Robert Love 2011-12-20 425 get_file(asma->file);
11980c2ac4ccfad Robert Love 2011-12-20 426
11980c2ac4ccfad Robert Love 2011-12-20 427 /*
11980c2ac4ccfad Robert Love 2011-12-20 428 * XXX - Reworked to use shmem_zero_setup() instead of
11980c2ac4ccfad Robert Love 2011-12-20 429 * shmem_set_file while we're in staging. -jstultz
11980c2ac4ccfad Robert Love 2011-12-20 430 */
11980c2ac4ccfad Robert Love 2011-12-20 431 if (vma->vm_flags & VM_SHARED) {
11980c2ac4ccfad Robert Love 2011-12-20 432 ret = shmem_zero_setup(vma);
11980c2ac4ccfad Robert Love 2011-12-20 433 if (ret) {
11980c2ac4ccfad Robert Love 2011-12-20 434 fput(asma->file);
11980c2ac4ccfad Robert Love 2011-12-20 435 goto out;
11980c2ac4ccfad Robert Love 2011-12-20 436 }
44960f2a7b63e22 John Stultz 2018-07-31 437 } else {
44960f2a7b63e22 John Stultz 2018-07-31 438 vma_set_anonymous(vma);
11980c2ac4ccfad Robert Love 2011-12-20 439 }
11980c2ac4ccfad Robert Love 2011-12-20 440
11980c2ac4ccfad Robert Love 2011-12-20 441 if (vma->vm_file)
11980c2ac4ccfad Robert Love 2011-12-20 442 fput(vma->vm_file);
11980c2ac4ccfad Robert Love 2011-12-20 443 vma->vm_file = asma->file;
11980c2ac4ccfad Robert Love 2011-12-20 444
11980c2ac4ccfad Robert Love 2011-12-20 445 out:
11980c2ac4ccfad Robert Love 2011-12-20 446 mutex_unlock(&ashmem_mutex);
11980c2ac4ccfad Robert Love 2011-12-20 447 return ret;
11980c2ac4ccfad Robert Love 2011-12-20 448 }
11980c2ac4ccfad Robert Love 2011-12-20 449
---
0-DAY CI Kernel Test Service, Intel Corporation
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^ permalink raw reply [flat|nested] 7+ messages in thread* Re: [PATCH] staging: android: ashmem: used const keyword
2020-07-28 17:59 [PATCH] staging: android: ashmem: used const keyword Dhiraj Sharma
` (3 preceding siblings ...)
2020-07-29 21:45 ` kernel test robot
@ 2020-08-05 8:43 ` kernel test robot
4 siblings, 0 replies; 7+ messages in thread
From: kernel test robot @ 2020-08-05 8:43 UTC (permalink / raw)
To: Dhiraj Sharma, gregkh, arve, tkjos, maco, joel, christian,
hridya, surenb
Cc: devel, Dhiraj Sharma, kbuild-all
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Hi Dhiraj,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on staging/staging-testing]
url: https://github.com/0day-ci/linux/commits/Dhiraj-Sharma/staging-android-ashmem-used-const-keyword/20200729-020222
base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git 11536442a3b4e1de6890ea5e805908debb74f94a
:::::: branch date: 6 days ago
:::::: commit date: 6 days ago
config: i386-randconfig-s002-20200803 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-14) 9.3.0
reproduce:
# apt-get install sparse
# sparse version: v0.6.2-117-g8c7aee71-dirty
# save the attached .config to linux build tree
make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
sparse warnings: (new ones prefixed by >>)
>> drivers/staging/android/ashmem.c:418:25: sparse: sparse: assignment to const expression
drivers/staging/android/ashmem.c:419:36: sparse: sparse: assignment to const expression
drivers/staging/android/ashmem.c:420:36: sparse: sparse: assignment to const expression
# https://github.com/0day-ci/linux/commit/e200c35fc32789d0eec4878160474e62f9eebeb7
git remote add linux-review https://github.com/0day-ci/linux
git remote update linux-review
git checkout e200c35fc32789d0eec4878160474e62f9eebeb7
vim +418 drivers/staging/android/ashmem.c
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 367
11980c2ac4ccfa Robert Love 2011-12-20 368 static int ashmem_mmap(struct file *file, struct vm_area_struct *vma)
11980c2ac4ccfa Robert Love 2011-12-20 369 {
e200c35fc32789 Dhiraj Sharma 2020-07-28 370 static const struct file_operations vmfile_fops;
11980c2ac4ccfa Robert Love 2011-12-20 371 struct ashmem_area *asma = file->private_data;
11980c2ac4ccfa Robert Love 2011-12-20 372 int ret = 0;
11980c2ac4ccfa Robert Love 2011-12-20 373
11980c2ac4ccfa Robert Love 2011-12-20 374 mutex_lock(&ashmem_mutex);
11980c2ac4ccfa Robert Love 2011-12-20 375
11980c2ac4ccfa Robert Love 2011-12-20 376 /* user needs to SET_SIZE before mapping */
59848d6aded59a Alistair Strachan 2018-06-19 377 if (!asma->size) {
11980c2ac4ccfa Robert Love 2011-12-20 378 ret = -EINVAL;
11980c2ac4ccfa Robert Love 2011-12-20 379 goto out;
11980c2ac4ccfa Robert Love 2011-12-20 380 }
11980c2ac4ccfa Robert Love 2011-12-20 381
8632c614565d0c Alistair Strachan 2018-06-19 382 /* requested mapping size larger than object size */
8632c614565d0c Alistair Strachan 2018-06-19 383 if (vma->vm_end - vma->vm_start > PAGE_ALIGN(asma->size)) {
11980c2ac4ccfa Robert Love 2011-12-20 384 ret = -EINVAL;
11980c2ac4ccfa Robert Love 2011-12-20 385 goto out;
11980c2ac4ccfa Robert Love 2011-12-20 386 }
11980c2ac4ccfa Robert Love 2011-12-20 387
11980c2ac4ccfa Robert Love 2011-12-20 388 /* requested protection bits must match our allowed protection mask */
59848d6aded59a Alistair Strachan 2018-06-19 389 if ((vma->vm_flags & ~calc_vm_prot_bits(asma->prot_mask, 0)) &
59848d6aded59a Alistair Strachan 2018-06-19 390 calc_vm_prot_bits(PROT_MASK, 0)) {
11980c2ac4ccfa Robert Love 2011-12-20 391 ret = -EPERM;
11980c2ac4ccfa Robert Love 2011-12-20 392 goto out;
11980c2ac4ccfa Robert Love 2011-12-20 393 }
56f76fc68492af Arve Hjønnevåg 2011-12-20 394 vma->vm_flags &= ~calc_vm_may_flags(~asma->prot_mask);
11980c2ac4ccfa Robert Love 2011-12-20 395
11980c2ac4ccfa Robert Love 2011-12-20 396 if (!asma->file) {
11980c2ac4ccfa Robert Love 2011-12-20 397 char *name = ASHMEM_NAME_DEF;
11980c2ac4ccfa Robert Love 2011-12-20 398 struct file *vmfile;
11980c2ac4ccfa Robert Love 2011-12-20 399
11980c2ac4ccfa Robert Love 2011-12-20 400 if (asma->name[ASHMEM_NAME_PREFIX_LEN] != '\0')
11980c2ac4ccfa Robert Love 2011-12-20 401 name = asma->name;
11980c2ac4ccfa Robert Love 2011-12-20 402
11980c2ac4ccfa Robert Love 2011-12-20 403 /* ... and allocate the backing shmem file */
11980c2ac4ccfa Robert Love 2011-12-20 404 vmfile = shmem_file_setup(name, asma->size, vma->vm_flags);
7f44cb0ba88b40 Viresh Kumar 2015-07-31 405 if (IS_ERR(vmfile)) {
11980c2ac4ccfa Robert Love 2011-12-20 406 ret = PTR_ERR(vmfile);
11980c2ac4ccfa Robert Love 2011-12-20 407 goto out;
11980c2ac4ccfa Robert Love 2011-12-20 408 }
97fbfef6bd5978 Shuxiao Zhang 2017-04-06 409 vmfile->f_mode |= FMODE_LSEEK;
11980c2ac4ccfa Robert Love 2011-12-20 410 asma->file = vmfile;
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 411 /*
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 412 * override mmap operation of the vmfile so that it can't be
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 413 * remapped which would lead to creation of a new vma with no
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 414 * asma permission checks. Have to override get_unmapped_area
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 415 * as well to prevent VM_BUG_ON check for f_ops modification.
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 416 */
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 417 if (!vmfile_fops.mmap) {
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 @418 vmfile_fops = *vmfile->f_op;
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 419 vmfile_fops.mmap = ashmem_vmfile_mmap;
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 420 vmfile_fops.get_unmapped_area =
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 421 ashmem_vmfile_get_unmapped_area;
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 422 }
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 423 vmfile->f_op = &vmfile_fops;
11980c2ac4ccfa Robert Love 2011-12-20 424 }
11980c2ac4ccfa Robert Love 2011-12-20 425 get_file(asma->file);
11980c2ac4ccfa Robert Love 2011-12-20 426
11980c2ac4ccfa Robert Love 2011-12-20 427 /*
11980c2ac4ccfa Robert Love 2011-12-20 428 * XXX - Reworked to use shmem_zero_setup() instead of
11980c2ac4ccfa Robert Love 2011-12-20 429 * shmem_set_file while we're in staging. -jstultz
11980c2ac4ccfa Robert Love 2011-12-20 430 */
11980c2ac4ccfa Robert Love 2011-12-20 431 if (vma->vm_flags & VM_SHARED) {
11980c2ac4ccfa Robert Love 2011-12-20 432 ret = shmem_zero_setup(vma);
11980c2ac4ccfa Robert Love 2011-12-20 433 if (ret) {
11980c2ac4ccfa Robert Love 2011-12-20 434 fput(asma->file);
11980c2ac4ccfa Robert Love 2011-12-20 435 goto out;
11980c2ac4ccfa Robert Love 2011-12-20 436 }
44960f2a7b63e2 John Stultz 2018-07-31 437 } else {
44960f2a7b63e2 John Stultz 2018-07-31 438 vma_set_anonymous(vma);
11980c2ac4ccfa Robert Love 2011-12-20 439 }
11980c2ac4ccfa Robert Love 2011-12-20 440
11980c2ac4ccfa Robert Love 2011-12-20 441 if (vma->vm_file)
11980c2ac4ccfa Robert Love 2011-12-20 442 fput(vma->vm_file);
11980c2ac4ccfa Robert Love 2011-12-20 443 vma->vm_file = asma->file;
11980c2ac4ccfa Robert Love 2011-12-20 444
11980c2ac4ccfa Robert Love 2011-12-20 445 out:
11980c2ac4ccfa Robert Love 2011-12-20 446 mutex_unlock(&ashmem_mutex);
11980c2ac4ccfa Robert Love 2011-12-20 447 return ret;
11980c2ac4ccfa Robert Love 2011-12-20 448 }
11980c2ac4ccfa Robert Love 2011-12-20 449
---
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^ permalink raw reply [flat|nested] 7+ messages in thread