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SubjectRe: [PATCH] staging: android: Remove set but unused variable in ashmem.c
Hi "Fabio,

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/Fabio-M-De-Francesco/staging-android-Remove-set-but-unused-variable-in-ashmem-c/20210724-040651
base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git f133717efc6f28052667daf682e99ffd4b3d7588
config: arm64-randconfig-r015-20210723 (attached as .config)
compiler: aarch64-linux-gcc (GCC) 10.3.0
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
# https://github.com/0day-ci/linux/commit/7e8f2aa391f91bb404e9c1b508cf3d13b0cfde94
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Fabio-M-De-Francesco/staging-android-Remove-set-but-unused-variable-in-ashmem-c/20210724-040651
git checkout 7e8f2aa391f91bb404e9c1b508cf3d13b0cfde94
# save the attached .config to linux build tree
mkdir build_dir
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross O=build_dir ARCH=arm64 SHELL=/bin/bash drivers/staging/android/

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 >>):

In file included from include/linux/spinlock.h:59,
from include/linux/wait.h:9,
from include/linux/wait_bit.h:8,
from include/linux/fs.h:6,
from drivers/staging/android/ashmem.c:16:
drivers/staging/android/ashmem.c: In function 'ashmem_mmap':
>> drivers/staging/android/ashmem.c:420:22: error: 'inode' undeclared (first use in this function)
420 | lockdep_set_class(&inode->i_rwsem, &backing_shmem_inode_class);
| ^~~~~
include/linux/lockdep.h:218:27: note: in definition of macro 'lockdep_set_class'
218 | lockdep_init_map_waits(&(lock)->dep_map, #key, key, 0, \
| ^~~~
drivers/staging/android/ashmem.c:420:22: note: each undeclared identifier is reported only once for each function it appears in
420 | lockdep_set_class(&inode->i_rwsem, &backing_shmem_inode_class);
| ^~~~~
include/linux/lockdep.h:218:27: note: in definition of macro 'lockdep_set_class'
218 | lockdep_init_map_waits(&(lock)->dep_map, #key, key, 0, \
| ^~~~


vim +/inode +420 drivers/staging/android/ashmem.c

6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 377
11980c2ac4ccfa Robert Love 2011-12-20 378 static int ashmem_mmap(struct file *file, struct vm_area_struct *vma)
11980c2ac4ccfa Robert Love 2011-12-20 379 {
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 380 static struct file_operations vmfile_fops;
11980c2ac4ccfa Robert Love 2011-12-20 381 struct ashmem_area *asma = file->private_data;
11980c2ac4ccfa Robert Love 2011-12-20 382 int ret = 0;
11980c2ac4ccfa Robert Love 2011-12-20 383
11980c2ac4ccfa Robert Love 2011-12-20 384 mutex_lock(&ashmem_mutex);
11980c2ac4ccfa Robert Love 2011-12-20 385
11980c2ac4ccfa Robert Love 2011-12-20 386 /* user needs to SET_SIZE before mapping */
59848d6aded59a Alistair Strachan 2018-06-19 387 if (!asma->size) {
11980c2ac4ccfa Robert Love 2011-12-20 388 ret = -EINVAL;
11980c2ac4ccfa Robert Love 2011-12-20 389 goto out;
11980c2ac4ccfa Robert Love 2011-12-20 390 }
11980c2ac4ccfa Robert Love 2011-12-20 391
8632c614565d0c Alistair Strachan 2018-06-19 392 /* requested mapping size larger than object size */
8632c614565d0c Alistair Strachan 2018-06-19 393 if (vma->vm_end - vma->vm_start > PAGE_ALIGN(asma->size)) {
11980c2ac4ccfa Robert Love 2011-12-20 394 ret = -EINVAL;
11980c2ac4ccfa Robert Love 2011-12-20 395 goto out;
11980c2ac4ccfa Robert Love 2011-12-20 396 }
11980c2ac4ccfa Robert Love 2011-12-20 397
11980c2ac4ccfa Robert Love 2011-12-20 398 /* requested protection bits must match our allowed protection mask */
59848d6aded59a Alistair Strachan 2018-06-19 399 if ((vma->vm_flags & ~calc_vm_prot_bits(asma->prot_mask, 0)) &
59848d6aded59a Alistair Strachan 2018-06-19 400 calc_vm_prot_bits(PROT_MASK, 0)) {
11980c2ac4ccfa Robert Love 2011-12-20 401 ret = -EPERM;
11980c2ac4ccfa Robert Love 2011-12-20 402 goto out;
11980c2ac4ccfa Robert Love 2011-12-20 403 }
56f76fc68492af Arve Hjønnevåg 2011-12-20 404 vma->vm_flags &= ~calc_vm_may_flags(~asma->prot_mask);
11980c2ac4ccfa Robert Love 2011-12-20 405
11980c2ac4ccfa Robert Love 2011-12-20 406 if (!asma->file) {
11980c2ac4ccfa Robert Love 2011-12-20 407 char *name = ASHMEM_NAME_DEF;
11980c2ac4ccfa Robert Love 2011-12-20 408 struct file *vmfile;
11980c2ac4ccfa Robert Love 2011-12-20 409
11980c2ac4ccfa Robert Love 2011-12-20 410 if (asma->name[ASHMEM_NAME_PREFIX_LEN] != '\0')
11980c2ac4ccfa Robert Love 2011-12-20 411 name = asma->name;
11980c2ac4ccfa Robert Love 2011-12-20 412
11980c2ac4ccfa Robert Love 2011-12-20 413 /* ... and allocate the backing shmem file */
11980c2ac4ccfa Robert Love 2011-12-20 414 vmfile = shmem_file_setup(name, asma->size, vma->vm_flags);
7f44cb0ba88b40 Viresh Kumar 2015-07-31 415 if (IS_ERR(vmfile)) {
11980c2ac4ccfa Robert Love 2011-12-20 416 ret = PTR_ERR(vmfile);
11980c2ac4ccfa Robert Love 2011-12-20 417 goto out;
11980c2ac4ccfa Robert Love 2011-12-20 418 }
97fbfef6bd5978 Shuxiao Zhang 2017-04-06 419 vmfile->f_mode |= FMODE_LSEEK;
3e338d3c95c735 Suren Baghdasaryan 2020-07-30 @420 lockdep_set_class(&inode->i_rwsem, &backing_shmem_inode_class);
11980c2ac4ccfa Robert Love 2011-12-20 421 asma->file = vmfile;
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 422 /*
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 423 * override mmap operation of the vmfile so that it can't be
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 424 * remapped which would lead to creation of a new vma with no
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 425 * asma permission checks. Have to override get_unmapped_area
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 426 * as well to prevent VM_BUG_ON check for f_ops modification.
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 427 */
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 428 if (!vmfile_fops.mmap) {
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 429 vmfile_fops = *vmfile->f_op;
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 430 vmfile_fops.mmap = ashmem_vmfile_mmap;
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 431 vmfile_fops.get_unmapped_area =
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 432 ashmem_vmfile_get_unmapped_area;
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 433 }
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 434 vmfile->f_op = &vmfile_fops;
11980c2ac4ccfa Robert Love 2011-12-20 435 }
11980c2ac4ccfa Robert Love 2011-12-20 436 get_file(asma->file);
11980c2ac4ccfa Robert Love 2011-12-20 437
11980c2ac4ccfa Robert Love 2011-12-20 438 /*
11980c2ac4ccfa Robert Love 2011-12-20 439 * XXX - Reworked to use shmem_zero_setup() instead of
11980c2ac4ccfa Robert Love 2011-12-20 440 * shmem_set_file while we're in staging. -jstultz
11980c2ac4ccfa Robert Love 2011-12-20 441 */
11980c2ac4ccfa Robert Love 2011-12-20 442 if (vma->vm_flags & VM_SHARED) {
11980c2ac4ccfa Robert Love 2011-12-20 443 ret = shmem_zero_setup(vma);
11980c2ac4ccfa Robert Love 2011-12-20 444 if (ret) {
11980c2ac4ccfa Robert Love 2011-12-20 445 fput(asma->file);
11980c2ac4ccfa Robert Love 2011-12-20 446 goto out;
11980c2ac4ccfa Robert Love 2011-12-20 447 }
44960f2a7b63e2 John Stultz 2018-07-31 448 } else {
44960f2a7b63e2 John Stultz 2018-07-31 449 vma_set_anonymous(vma);
11980c2ac4ccfa Robert Love 2011-12-20 450 }
11980c2ac4ccfa Robert Love 2011-12-20 451
295992fb815e79 Christian König 2020-09-14 452 vma_set_file(vma, asma->file);
295992fb815e79 Christian König 2020-09-14 453 /* XXX: merge this with the get_file() above if possible */
295992fb815e79 Christian König 2020-09-14 454 fput(asma->file);
11980c2ac4ccfa Robert Love 2011-12-20 455
11980c2ac4ccfa Robert Love 2011-12-20 456 out:
11980c2ac4ccfa Robert Love 2011-12-20 457 mutex_unlock(&ashmem_mutex);
11980c2ac4ccfa Robert Love 2011-12-20 458 return ret;
11980c2ac4ccfa Robert Love 2011-12-20 459 }
11980c2ac4ccfa Robert Love 2011-12-20 460

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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