tree: https://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git uaccess-fixes head: e0d18a84b133198aacb436f5a1c2a6ed97ec0155 commit: 8346f23b615d1890e06cf1fdfe922f6769b7adfd [17/28] ppc32: fix copy_from_user() config: powerpc-allnoconfig (attached as .config) compiler: powerpc-linux-gnu-gcc (Debian 5.4.0-6) 5.4.0 20160609 reproduce: wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 8346f23b615d1890e06cf1fdfe922f6769b7adfd # save the attached .config to linux build tree make.cross ARCH=powerpc All warnings (new ones prefixed by >>): In file included from include/asm-generic/termios-base.h:7:0, from arch/powerpc/include/asm/termios.h:20, from include/uapi/linux/termios.h:5, from include/linux/tty.h:6, from kernel/printk/printk.c:21: arch/powerpc/include/asm/uaccess.h: In function 'copy_from_user': >> arch/powerpc/include/asm/uaccess.h:311:16: warning: unused variable 'over' [-Wunused-variable] unsigned long over; ^ arch/powerpc/include/asm/uaccess.h: In function 'copy_to_user': arch/powerpc/include/asm/uaccess.h:325:16: warning: unused variable 'over' [-Wunused-variable] unsigned long over; ^ vim +/over +311 arch/powerpc/include/asm/uaccess.h e68c825b include/asm-powerpc/uaccess.h Benjamin Herrenschmidt 2007-04-11 295 __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \ 505e4283 arch/powerpc/include/asm/uaccess.h Michael S. Tsirkin 2014-12-14 296 (x) = (__force __typeof__(*(ptr)))__gu_val; \ e68c825b include/asm-powerpc/uaccess.h Benjamin Herrenschmidt 2007-04-11 297 __gu_err; \ e68c825b include/asm-powerpc/uaccess.h Benjamin Herrenschmidt 2007-04-11 298 }) e68c825b include/asm-powerpc/uaccess.h Benjamin Herrenschmidt 2007-04-11 299 e68c825b include/asm-powerpc/uaccess.h Benjamin Herrenschmidt 2007-04-11 300 2df5e8bc include/asm-powerpc/uaccess.h Stephen Rothwell 2005-10-29 301 /* more complex routines */ 2df5e8bc include/asm-powerpc/uaccess.h Stephen Rothwell 2005-10-29 302 2df5e8bc include/asm-powerpc/uaccess.h Stephen Rothwell 2005-10-29 303 extern unsigned long __copy_tofrom_user(void __user *to, 2df5e8bc include/asm-powerpc/uaccess.h Stephen Rothwell 2005-10-29 304 const void __user *from, unsigned long size); 2df5e8bc include/asm-powerpc/uaccess.h Stephen Rothwell 2005-10-29 305 2df5e8bc include/asm-powerpc/uaccess.h Stephen Rothwell 2005-10-29 306 #ifndef __powerpc64__ 5015b494 include/asm-powerpc/uaccess.h Stephen Rothwell 2005-10-31 307 4cfbdfff include/asm-powerpc/uaccess.h Adrian Bunk 2006-12-01 308 static inline unsigned long copy_from_user(void *to, 5015b494 include/asm-powerpc/uaccess.h Stephen Rothwell 2005-10-31 309 const void __user *from, unsigned long n) 2df5e8bc include/asm-powerpc/uaccess.h Stephen Rothwell 2005-10-29 310 { 2df5e8bc include/asm-powerpc/uaccess.h Stephen Rothwell 2005-10-29 @311 unsigned long over; 2df5e8bc include/asm-powerpc/uaccess.h Stephen Rothwell 2005-10-29 312 8346f23b arch/powerpc/include/asm/uaccess.h Al Viro 2016-08-21 313 if (likely(access_ok(VERIFY_READ, from, n))) { 1d3c1324 arch/powerpc/include/asm/uaccess.h Kees Cook 2016-06-23 314 if (!__builtin_constant_p(n)) 1d3c1324 arch/powerpc/include/asm/uaccess.h Kees Cook 2016-06-23 315 check_object_size(to, n, false); 2df5e8bc include/asm-powerpc/uaccess.h Stephen Rothwell 2005-10-29 316 return __copy_tofrom_user((__force void __user *)to, from, n); 1d3c1324 arch/powerpc/include/asm/uaccess.h Kees Cook 2016-06-23 317 } 8346f23b arch/powerpc/include/asm/uaccess.h Al Viro 2016-08-21 318 memset(to, 0, n); 2df5e8bc include/asm-powerpc/uaccess.h Stephen Rothwell 2005-10-29 319 return n; :::::: The code at line 311 was first introduced by commit :::::: 2df5e8bcca53e528a78ee0e3b114d0d21dd6d043 powerpc: merge uaccess.h :::::: TO: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> :::::: CC: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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