Hi Kangjie, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on scsi/for-next] [also build test WARNING on v4.20 next-20181224] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Kangjie-Lu/scsi-avoid-a-double-fetch-and-a-redundant-copy/20181226-042018 base: https://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi.git for-next config: m68k-allmodconfig (attached as .config) compiler: m68k-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0 reproduce: 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 GCC_VERSION=7.2.0 make.cross ARCH=m68k All warnings (new ones prefixed by >>): In file included from arch/m68k/include/asm/uaccess.h:5:0, from include/linux/uaccess.h:14, from include/linux/poll.h:12, from drivers/scsi/sg.c:42: drivers/scsi/sg.c: In function 'sg_read': drivers/scsi/sg.c:450:27: error: request for member 'pack_id' in something not a structure or union &((sg_io_hdr_t *)buf->pack_id)); ^ arch/m68k/include/asm/uaccess_mm.h:134:19: note: in definition of macro '__get_user' switch (sizeof(*(ptr))) { \ ^~~ drivers/scsi/sg.c:449:14: note: in expansion of macro 'get_user' retval = get_user(req_pack_id, ^~~~~~~~ drivers/scsi/sg.c:450:27: error: request for member 'pack_id' in something not a structure or union &((sg_io_hdr_t *)buf->pack_id)); ^ arch/m68k/include/asm/uaccess_mm.h:126:12: note: in definition of macro '__get_user_asm' : "m" (*(ptr)), "i" (err)); \ ^~~ >> arch/m68k/include/asm/uaccess_mm.h:180:26: note: in expansion of macro '__get_user' #define get_user(x, ptr) __get_user(x, ptr) ^~~~~~~~~~ drivers/scsi/sg.c:449:14: note: in expansion of macro 'get_user' retval = get_user(req_pack_id, ^~~~~~~~ drivers/scsi/sg.c:450:27: error: request for member 'pack_id' in something not a structure or union &((sg_io_hdr_t *)buf->pack_id)); ^ arch/m68k/include/asm/uaccess_mm.h:127:26: note: in definition of macro '__get_user_asm' (x) = (__force typeof(*(ptr)))(__force unsigned long)__gu_val; \ ^~~ >> arch/m68k/include/asm/uaccess_mm.h:180:26: note: in expansion of macro '__get_user' #define get_user(x, ptr) __get_user(x, ptr) ^~~~~~~~~~ drivers/scsi/sg.c:449:14: note: in expansion of macro 'get_user' retval = get_user(req_pack_id, ^~~~~~~~ drivers/scsi/sg.c:450:27: error: request for member 'pack_id' in something not a structure or union &((sg_io_hdr_t *)buf->pack_id)); ^ arch/m68k/include/asm/uaccess_mm.h:126:12: note: in definition of macro '__get_user_asm' : "m" (*(ptr)), "i" (err)); \ ^~~ >> arch/m68k/include/asm/uaccess_mm.h:180:26: note: in expansion of macro '__get_user' #define get_user(x, ptr) __get_user(x, ptr) ^~~~~~~~~~ drivers/scsi/sg.c:449:14: note: in expansion of macro 'get_user' retval = get_user(req_pack_id, ^~~~~~~~ drivers/scsi/sg.c:450:27: error: request for member 'pack_id' in something not a structure or union &((sg_io_hdr_t *)buf->pack_id)); ^ arch/m68k/include/asm/uaccess_mm.h:127:26: note: in definition of macro '__get_user_asm' (x) = (__force typeof(*(ptr)))(__force unsigned long)__gu_val; \ ^~~ >> arch/m68k/include/asm/uaccess_mm.h:180:26: note: in expansion of macro '__get_user' #define get_user(x, ptr) __get_user(x, ptr) ^~~~~~~~~~ drivers/scsi/sg.c:449:14: note: in expansion of macro 'get_user' retval = get_user(req_pack_id, ^~~~~~~~ drivers/scsi/sg.c:450:27: error: request for member 'pack_id' in something not a structure or union &((sg_io_hdr_t *)buf->pack_id)); ^ arch/m68k/include/asm/uaccess_mm.h:126:12: note: in definition of macro '__get_user_asm' : "m" (*(ptr)), "i" (err)); \ ^~~ >> arch/m68k/include/asm/uaccess_mm.h:180:26: note: in expansion of macro '__get_user' #define get_user(x, ptr) __get_user(x, ptr) ^~~~~~~~~~ drivers/scsi/sg.c:449:14: note: in expansion of macro 'get_user' retval = get_user(req_pack_id, ^~~~~~~~ drivers/scsi/sg.c:450:27: error: request for member 'pack_id' in something not a structure or union &((sg_io_hdr_t *)buf->pack_id)); ^ arch/m68k/include/asm/uaccess_mm.h:127:26: note: in definition of macro '__get_user_asm' (x) = (__force typeof(*(ptr)))(__force unsigned long)__gu_val; \ ^~~ >> arch/m68k/include/asm/uaccess_mm.h:180:26: note: in expansion of macro '__get_user' #define get_user(x, ptr) __get_user(x, ptr) ^~~~~~~~~~ drivers/scsi/sg.c:449:14: note: in expansion of macro 'get_user' retval = get_user(req_pack_id, ^~~~~~~~ drivers/scsi/sg.c:450:27: error: request for member 'pack_id' in something not a structure or union &((sg_io_hdr_t *)buf->pack_id)); ^ arch/m68k/include/asm/uaccess_mm.h:145:27: note: in definition of macro '__get_user' const void *__gu_ptr = (ptr); \ ^~~ drivers/scsi/sg.c:449:14: note: in expansion of macro 'get_user' retval = get_user(req_pack_id, ^~~~~~~~ drivers/scsi/sg.c:450:27: error: request for member 'pack_id' in something not a structure or union &((sg_io_hdr_t *)buf->pack_id)); ^ arch/m68k/include/asm/uaccess_mm.h:148:17: note: in definition of macro '__get_user' __typeof__(*(ptr)) t; \ ^~~ drivers/scsi/sg.c:449:14: note: in expansion of macro 'get_user' retval = get_user(req_pack_id, ^~~~~~~~ -- In file included from arch/m68k/include/asm/uaccess.h:5:0, from include/linux/uaccess.h:14, from include/linux/poll.h:12, from drivers//scsi/sg.c:42: drivers//scsi/sg.c: In function 'sg_read': drivers//scsi/sg.c:450:27: error: request for member 'pack_id' in something not a structure or union &((sg_io_hdr_t *)buf->pack_id)); ^ arch/m68k/include/asm/uaccess_mm.h:134:19: note: in definition of macro '__get_user' switch (sizeof(*(ptr))) { \ ^~~ drivers//scsi/sg.c:449:14: note: in expansion of macro 'get_user' retval = get_user(req_pack_id, ^~~~~~~~ drivers//scsi/sg.c:450:27: error: request for member 'pack_id' in something not a structure or union &((sg_io_hdr_t *)buf->pack_id)); ^ arch/m68k/include/asm/uaccess_mm.h:126:12: note: in definition of macro '__get_user_asm' : "m" (*(ptr)), "i" (err)); \ ^~~ >> arch/m68k/include/asm/uaccess_mm.h:180:26: note: in expansion of macro '__get_user' #define get_user(x, ptr) __get_user(x, ptr) ^~~~~~~~~~ drivers//scsi/sg.c:449:14: note: in expansion of macro 'get_user' retval = get_user(req_pack_id, ^~~~~~~~ drivers//scsi/sg.c:450:27: error: request for member 'pack_id' in something not a structure or union &((sg_io_hdr_t *)buf->pack_id)); ^ arch/m68k/include/asm/uaccess_mm.h:127:26: note: in definition of macro '__get_user_asm' (x) = (__force typeof(*(ptr)))(__force unsigned long)__gu_val; \ ^~~ >> arch/m68k/include/asm/uaccess_mm.h:180:26: note: in expansion of macro '__get_user' #define get_user(x, ptr) __get_user(x, ptr) ^~~~~~~~~~ drivers//scsi/sg.c:449:14: note: in expansion of macro 'get_user' retval = get_user(req_pack_id, ^~~~~~~~ drivers//scsi/sg.c:450:27: error: request for member 'pack_id' in something not a structure or union &((sg_io_hdr_t *)buf->pack_id)); ^ arch/m68k/include/asm/uaccess_mm.h:126:12: note: in definition of macro '__get_user_asm' : "m" (*(ptr)), "i" (err)); \ ^~~ >> arch/m68k/include/asm/uaccess_mm.h:180:26: note: in expansion of macro '__get_user' #define get_user(x, ptr) __get_user(x, ptr) ^~~~~~~~~~ drivers//scsi/sg.c:449:14: note: in expansion of macro 'get_user' retval = get_user(req_pack_id, ^~~~~~~~ drivers//scsi/sg.c:450:27: error: request for member 'pack_id' in something not a structure or union &((sg_io_hdr_t *)buf->pack_id)); ^ arch/m68k/include/asm/uaccess_mm.h:127:26: note: in definition of macro '__get_user_asm' (x) = (__force typeof(*(ptr)))(__force unsigned long)__gu_val; \ ^~~ >> arch/m68k/include/asm/uaccess_mm.h:180:26: note: in expansion of macro '__get_user' #define get_user(x, ptr) __get_user(x, ptr) ^~~~~~~~~~ drivers//scsi/sg.c:449:14: note: in expansion of macro 'get_user' retval = get_user(req_pack_id, ^~~~~~~~ drivers//scsi/sg.c:450:27: error: request for member 'pack_id' in something not a structure or union &((sg_io_hdr_t *)buf->pack_id)); ^ arch/m68k/include/asm/uaccess_mm.h:126:12: note: in definition of macro '__get_user_asm' : "m" (*(ptr)), "i" (err)); \ ^~~ >> arch/m68k/include/asm/uaccess_mm.h:180:26: note: in expansion of macro '__get_user' #define get_user(x, ptr) __get_user(x, ptr) ^~~~~~~~~~ drivers//scsi/sg.c:449:14: note: in expansion of macro 'get_user' retval = get_user(req_pack_id, ^~~~~~~~ drivers//scsi/sg.c:450:27: error: request for member 'pack_id' in something not a structure or union &((sg_io_hdr_t *)buf->pack_id)); ^ arch/m68k/include/asm/uaccess_mm.h:127:26: note: in definition of macro '__get_user_asm' (x) = (__force typeof(*(ptr)))(__force unsigned long)__gu_val; \ ^~~ >> arch/m68k/include/asm/uaccess_mm.h:180:26: note: in expansion of macro '__get_user' #define get_user(x, ptr) __get_user(x, ptr) ^~~~~~~~~~ drivers//scsi/sg.c:449:14: note: in expansion of macro 'get_user' retval = get_user(req_pack_id, ^~~~~~~~ drivers//scsi/sg.c:450:27: error: request for member 'pack_id' in something not a structure or union &((sg_io_hdr_t *)buf->pack_id)); ^ arch/m68k/include/asm/uaccess_mm.h:145:27: note: in definition of macro '__get_user' const void *__gu_ptr = (ptr); \ ^~~ drivers//scsi/sg.c:449:14: note: in expansion of macro 'get_user' retval = get_user(req_pack_id, ^~~~~~~~ drivers//scsi/sg.c:450:27: error: request for member 'pack_id' in something not a structure or union &((sg_io_hdr_t *)buf->pack_id)); ^ arch/m68k/include/asm/uaccess_mm.h:148:17: note: in definition of macro '__get_user' __typeof__(*(ptr)) t; \ ^~~ drivers//scsi/sg.c:449:14: note: in expansion of macro 'get_user' retval = get_user(req_pack_id, ^~~~~~~~ vim +/__get_user +180 arch/m68k/include/asm/uaccess_mm.h ^1da177e4 include/asm-m68k/uaccess.h Linus Torvalds 2005-04-16 107 ^1da177e4 include/asm-m68k/uaccess.h Linus Torvalds 2005-04-16 108 d94af931a include/asm-m68k/uaccess.h Roman Zippel 2006-06-23 109 #define __get_user_asm(res, x, ptr, type, bwl, reg, err) ({ \ d94af931a include/asm-m68k/uaccess.h Roman Zippel 2006-06-23 110 type __gu_val; \ d94af931a include/asm-m68k/uaccess.h Roman Zippel 2006-06-23 111 asm volatile ("\n" \ e08d703cc arch/m68k/include/asm/uaccess_mm.h Greg Ungerer 2011-10-14 112 "1: "MOVES"."#bwl" %2,%1\n" \ d94af931a include/asm-m68k/uaccess.h Roman Zippel 2006-06-23 113 "2:\n" \ ^1da177e4 include/asm-m68k/uaccess.h Linus Torvalds 2005-04-16 114 " .section .fixup,\"ax\"\n" \ ^1da177e4 include/asm-m68k/uaccess.h Linus Torvalds 2005-04-16 115 " .even\n" \ d94af931a include/asm-m68k/uaccess.h Roman Zippel 2006-06-23 116 "10: move.l %3,%0\n" \ e08d703cc arch/m68k/include/asm/uaccess_mm.h Greg Ungerer 2011-10-14 117 " sub.l %1,%1\n" \ d94af931a include/asm-m68k/uaccess.h Roman Zippel 2006-06-23 118 " jra 2b\n" \ ^1da177e4 include/asm-m68k/uaccess.h Linus Torvalds 2005-04-16 119 " .previous\n" \ d94af931a include/asm-m68k/uaccess.h Roman Zippel 2006-06-23 120 "\n" \ ^1da177e4 include/asm-m68k/uaccess.h Linus Torvalds 2005-04-16 121 " .section __ex_table,\"a\"\n" \ ^1da177e4 include/asm-m68k/uaccess.h Linus Torvalds 2005-04-16 122 " .align 4\n" \ d94af931a include/asm-m68k/uaccess.h Roman Zippel 2006-06-23 123 " .long 1b,10b\n" \ ^1da177e4 include/asm-m68k/uaccess.h Linus Torvalds 2005-04-16 124 " .previous" \ d94af931a include/asm-m68k/uaccess.h Roman Zippel 2006-06-23 125 : "+d" (res), "=&" #reg (__gu_val) \ d94af931a include/asm-m68k/uaccess.h Roman Zippel 2006-06-23 @126 : "m" (*(ptr)), "i" (err)); \ 09a2f7cf6 arch/m68k/include/asm/uaccess_mm.h Michael S. Tsirkin 2014-12-12 127 (x) = (__force typeof(*(ptr)))(__force unsigned long)__gu_val; \ d94af931a include/asm-m68k/uaccess.h Roman Zippel 2006-06-23 128 }) ^1da177e4 include/asm-m68k/uaccess.h Linus Torvalds 2005-04-16 129 d94af931a include/asm-m68k/uaccess.h Roman Zippel 2006-06-23 130 #define __get_user(x, ptr) \ ^1da177e4 include/asm-m68k/uaccess.h Linus Torvalds 2005-04-16 131 ({ \ d94af931a include/asm-m68k/uaccess.h Roman Zippel 2006-06-23 132 int __gu_err = 0; \ 11c40f8a6 include/asm-m68k/uaccess.h Al Viro 2006-01-12 133 __chk_user_ptr(ptr); \ ^1da177e4 include/asm-m68k/uaccess.h Linus Torvalds 2005-04-16 134 switch (sizeof(*(ptr))) { \ ^1da177e4 include/asm-m68k/uaccess.h Linus Torvalds 2005-04-16 135 case 1: \ d94af931a include/asm-m68k/uaccess.h Roman Zippel 2006-06-23 136 __get_user_asm(__gu_err, x, ptr, u8, b, d, -EFAULT); \ ^1da177e4 include/asm-m68k/uaccess.h Linus Torvalds 2005-04-16 137 break; \ ^1da177e4 include/asm-m68k/uaccess.h Linus Torvalds 2005-04-16 138 case 2: \ 631d8b674 arch/m68k/include/asm/uaccess_mm.h Geert Uytterhoeven 2013-06-09 139 __get_user_asm(__gu_err, x, ptr, u16, w, r, -EFAULT); \ ^1da177e4 include/asm-m68k/uaccess.h Linus Torvalds 2005-04-16 140 break; \ ^1da177e4 include/asm-m68k/uaccess.h Linus Torvalds 2005-04-16 141 case 4: \ d94af931a include/asm-m68k/uaccess.h Roman Zippel 2006-06-23 142 __get_user_asm(__gu_err, x, ptr, u32, l, r, -EFAULT); \ ^1da177e4 include/asm-m68k/uaccess.h Linus Torvalds 2005-04-16 143 break; \ 7124330da arch/m68k/include/asm/uaccess_mm.h Geert Uytterhoeven 2018-05-14 144 case 8: { \ d94af931a include/asm-m68k/uaccess.h Roman Zippel 2006-06-23 145 const void *__gu_ptr = (ptr); \ 7124330da arch/m68k/include/asm/uaccess_mm.h Geert Uytterhoeven 2018-05-14 146 union { \ 7124330da arch/m68k/include/asm/uaccess_mm.h Geert Uytterhoeven 2018-05-14 147 u64 l; \ 7124330da arch/m68k/include/asm/uaccess_mm.h Geert Uytterhoeven 2018-05-14 148 __typeof__(*(ptr)) t; \ 7124330da arch/m68k/include/asm/uaccess_mm.h Geert Uytterhoeven 2018-05-14 149 } __gu_val; \ d94af931a include/asm-m68k/uaccess.h Roman Zippel 2006-06-23 150 asm volatile ("\n" \ e08d703cc arch/m68k/include/asm/uaccess_mm.h Greg Ungerer 2011-10-14 151 "1: "MOVES".l (%2)+,%1\n" \ e08d703cc arch/m68k/include/asm/uaccess_mm.h Greg Ungerer 2011-10-14 152 "2: "MOVES".l (%2),%R1\n" \ d94af931a include/asm-m68k/uaccess.h Roman Zippel 2006-06-23 153 "3:\n" \ d94af931a include/asm-m68k/uaccess.h Roman Zippel 2006-06-23 154 " .section .fixup,\"ax\"\n" \ d94af931a include/asm-m68k/uaccess.h Roman Zippel 2006-06-23 155 " .even\n" \ d94af931a include/asm-m68k/uaccess.h Roman Zippel 2006-06-23 156 "10: move.l %3,%0\n" \ d94af931a include/asm-m68k/uaccess.h Roman Zippel 2006-06-23 157 " sub.l %1,%1\n" \ d94af931a include/asm-m68k/uaccess.h Roman Zippel 2006-06-23 158 " sub.l %R1,%R1\n" \ d94af931a include/asm-m68k/uaccess.h Roman Zippel 2006-06-23 159 " jra 3b\n" \ d94af931a include/asm-m68k/uaccess.h Roman Zippel 2006-06-23 160 " .previous\n" \ d94af931a include/asm-m68k/uaccess.h Roman Zippel 2006-06-23 161 "\n" \ d94af931a include/asm-m68k/uaccess.h Roman Zippel 2006-06-23 162 " .section __ex_table,\"a\"\n" \ d94af931a include/asm-m68k/uaccess.h Roman Zippel 2006-06-23 163 " .align 4\n" \ d94af931a include/asm-m68k/uaccess.h Roman Zippel 2006-06-23 164 " .long 1b,10b\n" \ d94af931a include/asm-m68k/uaccess.h Roman Zippel 2006-06-23 165 " .long 2b,10b\n" \ d94af931a include/asm-m68k/uaccess.h Roman Zippel 2006-06-23 166 " .previous" \ 7124330da arch/m68k/include/asm/uaccess_mm.h Geert Uytterhoeven 2018-05-14 167 : "+d" (__gu_err), "=&r" (__gu_val.l), \ d94af931a include/asm-m68k/uaccess.h Roman Zippel 2006-06-23 168 "+a" (__gu_ptr) \ d94af931a include/asm-m68k/uaccess.h Roman Zippel 2006-06-23 169 : "i" (-EFAULT) \ d94af931a include/asm-m68k/uaccess.h Roman Zippel 2006-06-23 170 : "memory"); \ 7124330da arch/m68k/include/asm/uaccess_mm.h Geert Uytterhoeven 2018-05-14 171 (x) = __gu_val.t; \ ^1da177e4 include/asm-m68k/uaccess.h Linus Torvalds 2005-04-16 172 break; \ 7124330da arch/m68k/include/asm/uaccess_mm.h Geert Uytterhoeven 2018-05-14 173 } \ ^1da177e4 include/asm-m68k/uaccess.h Linus Torvalds 2005-04-16 174 default: \ ^1da177e4 include/asm-m68k/uaccess.h Linus Torvalds 2005-04-16 175 __gu_err = __get_user_bad(); \ ^1da177e4 include/asm-m68k/uaccess.h Linus Torvalds 2005-04-16 176 break; \ ^1da177e4 include/asm-m68k/uaccess.h Linus Torvalds 2005-04-16 177 } \ ^1da177e4 include/asm-m68k/uaccess.h Linus Torvalds 2005-04-16 178 __gu_err; \ ^1da177e4 include/asm-m68k/uaccess.h Linus Torvalds 2005-04-16 179 }) d94af931a include/asm-m68k/uaccess.h Roman Zippel 2006-06-23 @180 #define get_user(x, ptr) __get_user(x, ptr) ^1da177e4 include/asm-m68k/uaccess.h Linus Torvalds 2005-04-16 181 :::::: The code at line 180 was first introduced by commit :::::: d94af931af42152e34539dd4782b1724084a89fb [PATCH] m68k: clean up uaccess.h :::::: TO: Roman Zippel <zippel@xxxxxxxxxxxxxx> :::::: CC: Linus Torvalds <torvalds@xxxxxxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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