Hi Dio, Thank you for the patch! Yet something to improve: [auto build test ERROR on staging/staging-testing] [cannot apply to aa5af974127d317071d6225a0f3678c5f520e7ce] url: https://github.com/0day-ci/linux/commits/Dio-Putra/staging-android-ashmem-c-Cleanup/20200614-013821 base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git af7b4801030c07637840191c69eb666917e4135d config: powerpc-randconfig-r016-20200614 (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project c669a1ed6386d57a75a602b53266466dae1e1d84) 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 # install powerpc cross compiling tool for clang build # apt-get install binutils-powerpc-linux-gnu # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All errors (new ones prefixed by >>, old ones prefixed by <<): ^ arch/powerpc/include/asm/io.h:543:56: note: expanded from macro '__do_insw' #define __do_insw(p, b, n) readsw((PCI_IO_ADDR)_IO_BASE+(p), (b), (n)) ~~~~~~~~~~~~~~~~~~~~~^ In file included from drivers/staging/android/ashmem.c:26: In file included from include/linux/shmem_fs.h:6: In file included from include/linux/swap.h:9: In file included from include/linux/memcontrol.h:13: In file included from include/linux/cgroup.h:26: In file included from include/linux/kernel_stat.h:9: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:10: In file included from arch/powerpc/include/asm/hardirq.h:6: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/powerpc/include/asm/io.h:605: arch/powerpc/include/asm/io-defs.h:47:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(insl, (unsigned long p, void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:602:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; ^~~~~~~~~~~~~~ <scratch space>:118:1: note: expanded from here __do_insl ^ arch/powerpc/include/asm/io.h:544:56: note: expanded from macro '__do_insl' #define __do_insl(p, b, n) readsl((PCI_IO_ADDR)_IO_BASE+(p), (b), (n)) ~~~~~~~~~~~~~~~~~~~~~^ In file included from drivers/staging/android/ashmem.c:26: In file included from include/linux/shmem_fs.h:6: In file included from include/linux/swap.h:9: In file included from include/linux/memcontrol.h:13: In file included from include/linux/cgroup.h:26: In file included from include/linux/kernel_stat.h:9: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:10: In file included from arch/powerpc/include/asm/hardirq.h:6: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/powerpc/include/asm/io.h:605: arch/powerpc/include/asm/io-defs.h:49:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(outsb, (unsigned long p, const void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:602:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; ^~~~~~~~~~~~~~ <scratch space>:120:1: note: expanded from here __do_outsb ^ arch/powerpc/include/asm/io.h:545:58: note: expanded from macro '__do_outsb' #define __do_outsb(p, b, n) writesb((PCI_IO_ADDR)_IO_BASE+(p),(b),(n)) ~~~~~~~~~~~~~~~~~~~~~^ In file included from drivers/staging/android/ashmem.c:26: In file included from include/linux/shmem_fs.h:6: In file included from include/linux/swap.h:9: In file included from include/linux/memcontrol.h:13: In file included from include/linux/cgroup.h:26: In file included from include/linux/kernel_stat.h:9: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:10: In file included from arch/powerpc/include/asm/hardirq.h:6: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/powerpc/include/asm/io.h:605: arch/powerpc/include/asm/io-defs.h:51:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(outsw, (unsigned long p, const void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:602:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; ^~~~~~~~~~~~~~ <scratch space>:122:1: note: expanded from here __do_outsw ^ arch/powerpc/include/asm/io.h:546:58: note: expanded from macro '__do_outsw' #define __do_outsw(p, b, n) writesw((PCI_IO_ADDR)_IO_BASE+(p),(b),(n)) ~~~~~~~~~~~~~~~~~~~~~^ In file included from drivers/staging/android/ashmem.c:26: In file included from include/linux/shmem_fs.h:6: In file included from include/linux/swap.h:9: In file included from include/linux/memcontrol.h:13: In file included from include/linux/cgroup.h:26: In file included from include/linux/kernel_stat.h:9: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:10: In file included from arch/powerpc/include/asm/hardirq.h:6: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/powerpc/include/asm/io.h:605: arch/powerpc/include/asm/io-defs.h:53:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(outsl, (unsigned long p, const void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:602:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; ^~~~~~~~~~~~~~ <scratch space>:124:1: note: expanded from here __do_outsl ^ arch/powerpc/include/asm/io.h:547:58: note: expanded from macro '__do_outsl' #define __do_outsl(p, b, n) writesl((PCI_IO_ADDR)_IO_BASE+(p),(b),(n)) ~~~~~~~~~~~~~~~~~~~~~^ >> drivers/staging/android/ashmem.c:418:16: error: cannot assign to variable 'vmfile_fops' with const-qualified type 'const struct file_operations' vmfile_fops = *vmfile->f_op; ~~~~~~~~~~~ ^ drivers/staging/android/ashmem.c:370:38: note: variable 'vmfile_fops' declared const here static const struct file_operations vmfile_fops; ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~ drivers/staging/android/ashmem.c:419:21: error: cannot assign to variable 'vmfile_fops' with const-qualified type 'const struct file_operations' vmfile_fops.mmap = ashmem_vmfile_mmap; ~~~~~~~~~~~~~~~~ ^ drivers/staging/android/ashmem.c:370:38: note: variable 'vmfile_fops' declared const here static const struct file_operations vmfile_fops; ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~ drivers/staging/android/ashmem.c:420:34: error: cannot assign to variable 'vmfile_fops' with const-qualified type 'const struct file_operations' vmfile_fops.get_unmapped_area = ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^ drivers/staging/android/ashmem.c:370:38: note: variable 'vmfile_fops' declared const here static const struct file_operations vmfile_fops; ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~ 6 warnings and 3 errors generated. 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 { 7fe32ab69ec805 Dio Putra 2020-06-14 370 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 :::::: The code at line 418 was first introduced by commit :::::: 6d67b0290b4b84c477e6a2fc6e005e174d3c7786 staging: android: ashmem: Disallow ashmem memory from being remapped :::::: TO: Suren Baghdasaryan <surenb@xxxxxxxxxx> :::::: CC: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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