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Date: Mon, 27 May 2019 12:13:39 +0800
From: kbuild test robot <lkp@...el.com>
To: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Cc: kbuild-all@...org, linux-fbdev@...r.kernel.org,
dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] video: fbdev: pvr2fb: add COMPILE_TEST support
Hi Bartlomiej,
I love your patch! Perhaps something to improve:
[auto build test WARNING on linus/master]
[also build test WARNING on v5.2-rc2 next-20190524]
[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/Bartlomiej-Zolnierkiewicz/video-fbdev-pvr2fb-remove-function-prototypes/20190524-145925
If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@...el.com>
smatch warnings:
drivers/video/fbdev/pvr2fb.c:467 pvr2fb_check_var() warn: unsigned 'var->xoffset' is never less than zero.
drivers/video/fbdev/pvr2fb.c:467 pvr2fb_check_var() warn: unsigned 'var->yoffset' is never less than zero.
vim +467 drivers/video/fbdev/pvr2fb.c
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 430
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 431 static int pvr2fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 432 {
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 433 struct pvr2fb_par *par = (struct pvr2fb_par *)info->par;
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 434 unsigned int vtotal, hsync_total;
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 435 unsigned long line_length;
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 436
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 437 if (var->pixclock != TV_CLK && var->pixclock != VGA_CLK) {
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 438 pr_debug("Invalid pixclock value %d\n", var->pixclock);
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 439 return -EINVAL;
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 440 }
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 441
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 442 if (var->xres < 320)
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 443 var->xres = 320;
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 444 if (var->yres < 240)
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 445 var->yres = 240;
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 446 if (var->xres_virtual < var->xres)
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 447 var->xres_virtual = var->xres;
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 448 if (var->yres_virtual < var->yres)
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 449 var->yres_virtual = var->yres;
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 450
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 451 if (var->bits_per_pixel <= 16)
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 452 var->bits_per_pixel = 16;
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 453 else if (var->bits_per_pixel <= 24)
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 454 var->bits_per_pixel = 24;
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 455 else if (var->bits_per_pixel <= 32)
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 456 var->bits_per_pixel = 32;
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 457
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 458 set_color_bitfields(var);
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 459
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 460 if (var->vmode & FB_VMODE_YWRAP) {
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 461 if (var->xoffset || var->yoffset < 0 ||
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 462 var->yoffset >= var->yres_virtual) {
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 463 var->xoffset = var->yoffset = 0;
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 464 } else {
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 465 if (var->xoffset > var->xres_virtual - var->xres ||
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 466 var->yoffset > var->yres_virtual - var->yres ||
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 @467 var->xoffset < 0 || var->yoffset < 0)
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 468 var->xoffset = var->yoffset = 0;
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 469 }
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 470 } else {
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 471 var->xoffset = var->yoffset = 0;
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 472 }
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 473
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 474 /*
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 475 * XXX: Need to be more creative with this (i.e. allow doublecan for
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 476 * PAL/NTSC output).
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 477 */
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 478 if (var->yres < 480 && video_output == VO_VGA)
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 479 var->vmode |= FB_VMODE_DOUBLE;
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 480
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 481 if (video_output != VO_VGA) {
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 482 var->sync |= FB_SYNC_BROADCAST;
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 483 var->vmode |= FB_VMODE_INTERLACED;
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 484 } else {
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 485 var->sync &= ~FB_SYNC_BROADCAST;
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 486 var->vmode &= ~FB_VMODE_INTERLACED;
fcb1fec7 drivers/video/pvr2fb.c Paul Mundt 2008-03-06 487 var->vmode |= FB_VMODE_NONINTERLACED;
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 488 }
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 489
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 490 if ((var->activate & FB_ACTIVATE_MASK) != FB_ACTIVATE_TEST) {
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 491 var->right_margin = par->borderstop_h -
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 492 (par->diwstart_h + var->xres);
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 493 var->left_margin = par->diwstart_h - par->borderstart_h;
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 494 var->hsync_len = par->borderstart_h +
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 495 (par->hsync_total - par->borderstop_h);
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 496
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 497 var->upper_margin = par->diwstart_v - par->borderstart_v;
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 498 var->lower_margin = par->borderstop_v -
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 499 (par->diwstart_v + var->yres);
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 500 var->vsync_len = par->borderstop_v +
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 501 (par->vsync_total - par->borderstop_v);
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 502 }
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 503
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 504 hsync_total = var->left_margin + var->xres + var->right_margin +
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 505 var->hsync_len;
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 506 vtotal = var->upper_margin + var->yres + var->lower_margin +
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 507 var->vsync_len;
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 508
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 509 if (var->sync & FB_SYNC_BROADCAST) {
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 510 if (var->vmode & FB_VMODE_INTERLACED)
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 511 vtotal /= 2;
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 512 if (vtotal > (PAL_VTOTAL + NTSC_VTOTAL)/2) {
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 513 /* PAL video output */
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 514 /* XXX: Should be using a range here ... ? */
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 515 if (hsync_total != PAL_HTOTAL) {
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 516 pr_debug("invalid hsync total for PAL\n");
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 517 return -EINVAL;
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 518 }
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 519 } else {
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 520 /* NTSC video output */
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 521 if (hsync_total != NTSC_HTOTAL) {
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 522 pr_debug("invalid hsync total for NTSC\n");
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 523 return -EINVAL;
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 524 }
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 525 }
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 526 }
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 527
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 528 /* Check memory sizes */
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 529 line_length = get_line_length(var->xres_virtual, var->bits_per_pixel);
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 530 if (line_length * var->yres_virtual > info->fix.smem_len)
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 531 return -ENOMEM;
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 532
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 533 return 0;
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 534 }
^1da177e drivers/video/pvr2fb.c Linus Torvalds 2005-04-16 535
:::::: The code at line 467 was first introduced by commit
:::::: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Linux-2.6.12-rc2
:::::: TO: Linus Torvalds <torvalds@...970.osdl.org>
:::::: CC: Linus Torvalds <torvalds@...970.osdl.org>
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