Hi Kangjie, Thank you for the patch! Yet something to improve: [auto build test ERROR on scsi/for-next] [also build test ERROR 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: i386-randconfig-x079-201851 (attached as .config) compiler: gcc-7 (Debian 7.3.0-1) 7.3.0 reproduce: # save the attached .config to linux build tree make ARCH=i386 All error/warnings (new ones prefixed by >>): In file included from include/linux/uaccess.h:14:0, 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/x86/include/asm/uaccess.h:138:41: note: in definition of macro '__inttype' __typeof__(__builtin_choose_expr(sizeof(x) > sizeof(0UL), 0ULL, 0UL)) ^ >> drivers//scsi/sg.c:449:14: note: in expansion of macro 'get_user' retval = get_user(req_pack_id, ^~~~~~~~ >> arch/x86/include/asm/uaccess.h:138:12: error: first argument to '__builtin_choose_expr' not a constant __typeof__(__builtin_choose_expr(sizeof(x) > sizeof(0UL), 0ULL, 0UL)) ^ >> arch/x86/include/asm/uaccess.h:174:11: note: in expansion of macro '__inttype' register __inttype(*(ptr)) __val_gu asm("%"_ASM_DX); \ ^~~~~~~~~ >> 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/x86/include/asm/uaccess.h:180:15: note: in definition of macro 'get_user' : "0" (ptr), "i" (sizeof(*(ptr)))); \ ^~~ >> 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/x86/include/asm/uaccess.h:180:35: note: in definition of macro 'get_user' : "0" (ptr), "i" (sizeof(*(ptr)))); \ ^~~ >> 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/x86/include/asm/uaccess.h:181:30: note: in definition of macro 'get_user' (x) = (__force __typeof__(*(ptr))) __val_gu; \ ^~~ -- In file included from include/linux/uaccess.h:14:0, 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/x86/include/asm/uaccess.h:138:41: note: in definition of macro '__inttype' __typeof__(__builtin_choose_expr(sizeof(x) > sizeof(0UL), 0ULL, 0UL)) ^ drivers/scsi/sg.c:449:14: note: in expansion of macro 'get_user' retval = get_user(req_pack_id, ^~~~~~~~ >> arch/x86/include/asm/uaccess.h:138:12: error: first argument to '__builtin_choose_expr' not a constant __typeof__(__builtin_choose_expr(sizeof(x) > sizeof(0UL), 0ULL, 0UL)) ^ >> arch/x86/include/asm/uaccess.h:174:11: note: in expansion of macro '__inttype' register __inttype(*(ptr)) __val_gu asm("%"_ASM_DX); \ ^~~~~~~~~ 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/x86/include/asm/uaccess.h:180:15: note: in definition of macro 'get_user' : "0" (ptr), "i" (sizeof(*(ptr)))); \ ^~~ 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/x86/include/asm/uaccess.h:180:35: note: in definition of macro 'get_user' : "0" (ptr), "i" (sizeof(*(ptr)))); \ ^~~ 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/x86/include/asm/uaccess.h:181:30: note: in definition of macro 'get_user' (x) = (__force __typeof__(*(ptr))) __val_gu; \ ^~~ vim +/pack_id +450 drivers//scsi/sg.c 412 413 static ssize_t 414 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) 415 { 416 Sg_device *sdp; 417 Sg_fd *sfp; 418 Sg_request *srp; 419 int req_pack_id = -1; 420 sg_io_hdr_t *hp; 421 struct sg_header *old_hdr = NULL; 422 int retval = 0; 423 424 /* 425 * This could cause a response to be stranded. Close the associated 426 * file descriptor to free up any resources being held. 427 */ 428 retval = sg_check_file_access(filp, __func__); 429 if (retval) 430 return retval; 431 432 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 433 return -ENXIO; 434 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, 435 "sg_read: count=%d\n", (int) count)); 436 437 if (!access_ok(VERIFY_WRITE, buf, count)) 438 return -EFAULT; 439 if (sfp->force_packid && (count >= SZ_SG_HEADER)) { 440 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); 441 if (!old_hdr) 442 return -ENOMEM; 443 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) { 444 retval = -EFAULT; 445 goto free_old_hdr; 446 } 447 if (old_hdr->reply_len < 0) { 448 if (count >= SZ_SG_IO_HDR) { > 449 retval = get_user(req_pack_id, > 450 &((sg_io_hdr_t *)buf->pack_id)); 451 if (retval) { 452 retval = -EFAULT; 453 goto free_old_hdr; 454 } 455 } 456 } else 457 req_pack_id = old_hdr->pack_id; 458 } 459 srp = sg_get_rq_mark(sfp, req_pack_id); 460 if (!srp) { /* now wait on packet to arrive */ 461 if (atomic_read(&sdp->detaching)) { 462 retval = -ENODEV; 463 goto free_old_hdr; 464 } 465 if (filp->f_flags & O_NONBLOCK) { 466 retval = -EAGAIN; 467 goto free_old_hdr; 468 } 469 retval = wait_event_interruptible(sfp->read_wait, 470 (atomic_read(&sdp->detaching) || 471 (srp = sg_get_rq_mark(sfp, req_pack_id)))); 472 if (atomic_read(&sdp->detaching)) { 473 retval = -ENODEV; 474 goto free_old_hdr; 475 } 476 if (retval) { 477 /* -ERESTARTSYS as signal hit process */ 478 goto free_old_hdr; 479 } 480 } 481 if (srp->header.interface_id != '\0') { 482 retval = sg_new_read(sfp, buf, count, srp); 483 goto free_old_hdr; 484 } 485 486 hp = &srp->header; 487 if (old_hdr == NULL) { 488 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); 489 if (! old_hdr) { 490 retval = -ENOMEM; 491 goto free_old_hdr; 492 } 493 } 494 memset(old_hdr, 0, SZ_SG_HEADER); 495 old_hdr->reply_len = (int) hp->timeout; 496 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */ 497 old_hdr->pack_id = hp->pack_id; 498 old_hdr->twelve_byte = 499 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0; 500 old_hdr->target_status = hp->masked_status; 501 old_hdr->host_status = hp->host_status; 502 old_hdr->driver_status = hp->driver_status; 503 if ((CHECK_CONDITION & hp->masked_status) || 504 (DRIVER_SENSE & hp->driver_status)) 505 memcpy(old_hdr->sense_buffer, srp->sense_b, 506 sizeof (old_hdr->sense_buffer)); 507 switch (hp->host_status) { 508 /* This setup of 'result' is for backward compatibility and is best 509 ignored by the user who should use target, host + driver status */ 510 case DID_OK: 511 case DID_PASSTHROUGH: 512 case DID_SOFT_ERROR: 513 old_hdr->result = 0; 514 break; 515 case DID_NO_CONNECT: 516 case DID_BUS_BUSY: 517 case DID_TIME_OUT: 518 old_hdr->result = EBUSY; 519 break; 520 case DID_BAD_TARGET: 521 case DID_ABORT: 522 case DID_PARITY: 523 case DID_RESET: 524 case DID_BAD_INTR: 525 old_hdr->result = EIO; 526 break; 527 case DID_ERROR: 528 old_hdr->result = (srp->sense_b[0] == 0 && 529 hp->masked_status == GOOD) ? 0 : EIO; 530 break; 531 default: 532 old_hdr->result = EIO; 533 break; 534 } 535 536 /* Now copy the result back to the user buffer. */ 537 if (count >= SZ_SG_HEADER) { 538 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) { 539 retval = -EFAULT; 540 goto free_old_hdr; 541 } 542 buf += SZ_SG_HEADER; 543 if (count > old_hdr->reply_len) 544 count = old_hdr->reply_len; 545 if (count > SZ_SG_HEADER) { 546 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) { 547 retval = -EFAULT; 548 goto free_old_hdr; 549 } 550 } 551 } else 552 count = (old_hdr->result == 0) ? 0 : -EIO; 553 sg_finish_rem_req(srp); 554 sg_remove_request(sfp, srp); 555 retval = count; 556 free_old_hdr: 557 kfree(old_hdr); 558 return retval; 559 } 560 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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