tree: git://git.kernel.org/pub/scm/linux/kernel/git/mhocko/mm.git since-4.0
head: c9b476738d0773d94fa2bf9c2e867ef8206fa817
commit: b2f8bd26fdd5e7869e67a5a2cbff073eb4b52895 [185/259] mm: rcu-protected get_mm_exe_file()
reproduce:
# apt-get install sparse
git checkout b2f8bd26fdd5e7869e67a5a2cbff073eb4b52895
make ARCH=x86_64 allmodconfig
make C=1 CF=-D__CHECK_ENDIAN__
sparse warnings: (new ones prefixed by >>)
>> arch/x86/oprofile/../../../drivers/oprofile/buffer_sync.c:229:46: sparse: incorrect type in argument 1 (different address spaces)
arch/x86/oprofile/../../../drivers/oprofile/buffer_sync.c:229:46: expected struct path *path
arch/x86/oprofile/../../../drivers/oprofile/buffer_sync.c:229:46: got struct path [noderef] <asn:4>*<noident>
--
>> security/tomoyo/util.c:958:51: sparse: incorrect type in argument 1 (different address spaces)
security/tomoyo/util.c:958:51: expected struct path *path
security/tomoyo/util.c:958:51: got struct path [noderef] <asn:4>*<noident>
vim +229 arch/x86/oprofile/../../../drivers/oprofile/buffer_sync.c
448678a0 Jan Blunck 2008-02-14 213 return (unsigned long)path->dentry;
448678a0 Jan Blunck 2008-02-14 214 get_dcookie(path, &cookie);
^1da177e Linus Torvalds 2005-04-16 215 return cookie;
^1da177e Linus Torvalds 2005-04-16 216 }
^1da177e Linus Torvalds 2005-04-16 217
^1da177e Linus Torvalds 2005-04-16 218
2dd8ad81 Konstantin Khlebnikov 2012-10-08 219 /* Look up the dcookie for the task's mm->exe_file,
^1da177e Linus Torvalds 2005-04-16 220 * which corresponds loosely to "application name". This is
^1da177e Linus Torvalds 2005-04-16 221 * not strictly necessary but allows oprofile to associate
^1da177e Linus Torvalds 2005-04-16 222 * shared-library samples with particular applications
^1da177e Linus Torvalds 2005-04-16 223 */
^1da177e Linus Torvalds 2005-04-16 224 static unsigned long get_exec_dcookie(struct mm_struct *mm)
^1da177e Linus Torvalds 2005-04-16 225 {
0c0a400d John Levon 2005-06-23 226 unsigned long cookie = NO_COOKIE;
^1da177e Linus Torvalds 2005-04-16 227
2dd8ad81 Konstantin Khlebnikov 2012-10-08 228 if (mm && mm->exe_file)
2dd8ad81 Konstantin Khlebnikov 2012-10-08 @229 cookie = fast_get_dcookie(&mm->exe_file->f_path);
^1da177e Linus Torvalds 2005-04-16 230
^1da177e Linus Torvalds 2005-04-16 231 return cookie;
^1da177e Linus Torvalds 2005-04-16 232 }
^1da177e Linus Torvalds 2005-04-16 233
^1da177e Linus Torvalds 2005-04-16 234
^1da177e Linus Torvalds 2005-04-16 235 /* Convert the EIP value of a sample into a persistent dentry/offset
^1da177e Linus Torvalds 2005-04-16 236 * pair that can then be added to the global event buffer. We make
^1da177e Linus Torvalds 2005-04-16 237 * sure to do this lookup before a mm->mmap modification happens so
:::::: The code at line 229 was first introduced by commit
:::::: 2dd8ad81e31d0d36a5d448329c646ab43eb17788 mm: use mm->exe_file instead of first VM_EXECUTABLE vma->vm_file
:::::: TO: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxx>
:::::: CC: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
---
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