CC: [email protected] CC: [email protected] TO: Jordan Niethe <[email protected]> CC: Michael Ellerman <[email protected]> CC: Alistair Popple <[email protected]>
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 7fe10096c1508c7f033d34d0741809f8eecc1ed4 commit: 7c95d8893fb55869882c9f68f4c94840dc43f18f powerpc: Change calling convention for create_branch() et. al. date: 4 months ago :::::: branch date: 23 hours ago :::::: commit date: 4 months ago compiler: powerpc64-linux-gcc (GCC) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <[email protected]> cppcheck warnings: (new ones prefixed by >>) >> arch/powerpc/lib/code-patching.c:455:6: warning: Variable 'err' is >> reassigned a value before the old one has been used. [redundantAssignment] err = create_branch(&instr, &instr, addr - 0x100, BRANCH_SET_LINK); ^ arch/powerpc/lib/code-patching.c:451:6: note: Variable 'err' is reassigned a value before the old one has been used. err = create_branch(&instr, &instr, addr, BRANCH_SET_LINK); ^ arch/powerpc/lib/code-patching.c:455:6: note: Variable 'err' is reassigned a value before the old one has been used. err = create_branch(&instr, &instr, addr - 0x100, BRANCH_SET_LINK); ^ arch/powerpc/lib/code-patching.c:459:6: warning: Variable 'err' is reassigned a value before the old one has been used. [redundantAssignment] err = create_branch(&instr, &instr, addr + 0x100, 0); ^ arch/powerpc/lib/code-patching.c:455:6: note: Variable 'err' is reassigned a value before the old one has been used. err = create_branch(&instr, &instr, addr - 0x100, BRANCH_SET_LINK); ^ arch/powerpc/lib/code-patching.c:459:6: note: Variable 'err' is reassigned a value before the old one has been used. err = create_branch(&instr, &instr, addr + 0x100, 0); ^ arch/powerpc/lib/code-patching.c:463:6: warning: Variable 'err' is reassigned a value before the old one has been used. [redundantAssignment] err = create_branch(&instr, &instr, addr - 0x2000000, BRANCH_SET_LINK); ^ arch/powerpc/lib/code-patching.c:459:6: note: Variable 'err' is reassigned a value before the old one has been used. err = create_branch(&instr, &instr, addr + 0x100, 0); ^ arch/powerpc/lib/code-patching.c:463:6: note: Variable 'err' is reassigned a value before the old one has been used. err = create_branch(&instr, &instr, addr - 0x2000000, BRANCH_SET_LINK); ^ arch/powerpc/lib/code-patching.c:467:6: warning: Variable 'err' is reassigned a value before the old one has been used. [redundantAssignment] err = create_branch(&instr, &instr, addr - 0x2000004, BRANCH_SET_LINK); ^ arch/powerpc/lib/code-patching.c:463:6: note: Variable 'err' is reassigned a value before the old one has been used. err = create_branch(&instr, &instr, addr - 0x2000000, BRANCH_SET_LINK); ^ arch/powerpc/lib/code-patching.c:467:6: note: Variable 'err' is reassigned a value before the old one has been used. err = create_branch(&instr, &instr, addr - 0x2000004, BRANCH_SET_LINK); ^ arch/powerpc/lib/code-patching.c:540:6: warning: Variable 'err' is reassigned a value before the old one has been used. [redundantAssignment] err = create_cond_branch(&instr, iptr, addr - 0x100, flags); ^ arch/powerpc/lib/code-patching.c:536:6: note: Variable 'err' is reassigned a value before the old one has been used. err = create_cond_branch(&instr, iptr, addr, flags); ^ arch/powerpc/lib/code-patching.c:540:6: note: Variable 'err' is reassigned a value before the old one has been used. err = create_cond_branch(&instr, iptr, addr - 0x100, flags); ^ arch/powerpc/lib/code-patching.c:544:6: warning: Variable 'err' is reassigned a value before the old one has been used. [redundantAssignment] err = create_cond_branch(&instr, iptr, addr + 0x100, flags); ^ arch/powerpc/lib/code-patching.c:540:6: note: Variable 'err' is reassigned a value before the old one has been used. err = create_cond_branch(&instr, iptr, addr - 0x100, flags); ^ arch/powerpc/lib/code-patching.c:544:6: note: Variable 'err' is reassigned a value before the old one has been used. err = create_cond_branch(&instr, iptr, addr + 0x100, flags); ^ arch/powerpc/lib/code-patching.c:548:6: warning: Variable 'err' is reassigned a value before the old one has been used. [redundantAssignment] err = create_cond_branch(&instr, iptr, addr - 0x8000, flags); ^ arch/powerpc/lib/code-patching.c:544:6: note: Variable 'err' is reassigned a value before the old one has been used. err = create_cond_branch(&instr, iptr, addr + 0x100, flags); ^ arch/powerpc/lib/code-patching.c:548:6: note: Variable 'err' is reassigned a value before the old one has been used. err = create_cond_branch(&instr, iptr, addr - 0x8000, flags); ^ arch/powerpc/lib/code-patching.c:552:6: warning: Variable 'err' is reassigned a value before the old one has been used. [redundantAssignment] err = create_cond_branch(&instr, iptr, addr - 0x8004, flags); ^ arch/powerpc/lib/code-patching.c:548:6: note: Variable 'err' is reassigned a value before the old one has been used. err = create_cond_branch(&instr, iptr, addr - 0x8000, flags); ^ arch/powerpc/lib/code-patching.c:552:6: note: Variable 'err' is reassigned a value before the old one has been used. err = create_cond_branch(&instr, iptr, addr - 0x8004, flags); ^ >> arch/powerpc/mm/nohash/tlb.c:304:8: warning: Possible null pointer >> dereference: mm [nullPointer] pid = mm->context.id; ^ arch/powerpc/mm/nohash/tlb.c:342:23: note: Calling function '__flush_tlb_page', 1st argument 'vma?vma->vm_mm:NULL' value is 0 __flush_tlb_page(vma ? vma->vm_mm : NULL, vmaddr, ^ arch/powerpc/mm/nohash/tlb.c:304:8: note: Null pointer dereference pid = mm->context.id; ^ # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7c95d8893fb55869882c9f68f4c94840dc43f18f git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 7c95d8893fb55869882c9f68f4c94840dc43f18f vim +/err +455 arch/powerpc/lib/code-patching.c ae0dc73625f9b0 Michael Ellerman 2008-06-24 404 ae0dc73625f9b0 Michael Ellerman 2008-06-24 405 #define check(x) \ ae0dc73625f9b0 Michael Ellerman 2008-06-24 406 if (!(x)) printk("code-patching: test failed at line %d\n", __LINE__); ae0dc73625f9b0 Michael Ellerman 2008-06-24 407 ae0dc73625f9b0 Michael Ellerman 2008-06-24 408 static void __init test_branch_iform(void) ae0dc73625f9b0 Michael Ellerman 2008-06-24 409 { 7c95d8893fb558 Jordan Niethe 2020-05-06 410 int err; ae0dc73625f9b0 Michael Ellerman 2008-06-24 411 unsigned int instr; ae0dc73625f9b0 Michael Ellerman 2008-06-24 412 unsigned long addr; ae0dc73625f9b0 Michael Ellerman 2008-06-24 413 ae0dc73625f9b0 Michael Ellerman 2008-06-24 414 addr = (unsigned long)&instr; ae0dc73625f9b0 Michael Ellerman 2008-06-24 415 ae0dc73625f9b0 Michael Ellerman 2008-06-24 416 /* The simplest case, branch to self, no flags */ ae0dc73625f9b0 Michael Ellerman 2008-06-24 417 check(instr_is_branch_iform(0x48000000)); ae0dc73625f9b0 Michael Ellerman 2008-06-24 418 /* All bits of target set, and flags */ ae0dc73625f9b0 Michael Ellerman 2008-06-24 419 check(instr_is_branch_iform(0x4bffffff)); ae0dc73625f9b0 Michael Ellerman 2008-06-24 420 /* High bit of opcode set, which is wrong */ ae0dc73625f9b0 Michael Ellerman 2008-06-24 421 check(!instr_is_branch_iform(0xcbffffff)); ae0dc73625f9b0 Michael Ellerman 2008-06-24 422 /* Middle bits of opcode set, which is wrong */ ae0dc73625f9b0 Michael Ellerman 2008-06-24 423 check(!instr_is_branch_iform(0x7bffffff)); ae0dc73625f9b0 Michael Ellerman 2008-06-24 424 ae0dc73625f9b0 Michael Ellerman 2008-06-24 425 /* Simplest case, branch to self with link */ ae0dc73625f9b0 Michael Ellerman 2008-06-24 426 check(instr_is_branch_iform(0x48000001)); ae0dc73625f9b0 Michael Ellerman 2008-06-24 427 /* All bits of targets set */ ae0dc73625f9b0 Michael Ellerman 2008-06-24 428 check(instr_is_branch_iform(0x4bfffffd)); ae0dc73625f9b0 Michael Ellerman 2008-06-24 429 /* Some bits of targets set */ ae0dc73625f9b0 Michael Ellerman 2008-06-24 430 check(instr_is_branch_iform(0x4bff00fd)); ae0dc73625f9b0 Michael Ellerman 2008-06-24 431 /* Must be a valid branch to start with */ ae0dc73625f9b0 Michael Ellerman 2008-06-24 432 check(!instr_is_branch_iform(0x7bfffffd)); ae0dc73625f9b0 Michael Ellerman 2008-06-24 433 ae0dc73625f9b0 Michael Ellerman 2008-06-24 434 /* Absolute branch to 0x100 */ ae0dc73625f9b0 Michael Ellerman 2008-06-24 435 instr = 0x48000103; ae0dc73625f9b0 Michael Ellerman 2008-06-24 436 check(instr_is_branch_to_addr(&instr, 0x100)); ae0dc73625f9b0 Michael Ellerman 2008-06-24 437 /* Absolute branch to 0x420fc */ ae0dc73625f9b0 Michael Ellerman 2008-06-24 438 instr = 0x480420ff; ae0dc73625f9b0 Michael Ellerman 2008-06-24 439 check(instr_is_branch_to_addr(&instr, 0x420fc)); ae0dc73625f9b0 Michael Ellerman 2008-06-24 440 /* Maximum positive relative branch, + 20MB - 4B */ ae0dc73625f9b0 Michael Ellerman 2008-06-24 441 instr = 0x49fffffc; ae0dc73625f9b0 Michael Ellerman 2008-06-24 442 check(instr_is_branch_to_addr(&instr, addr + 0x1FFFFFC)); ae0dc73625f9b0 Michael Ellerman 2008-06-24 443 /* Smallest negative relative branch, - 4B */ ae0dc73625f9b0 Michael Ellerman 2008-06-24 444 instr = 0x4bfffffc; ae0dc73625f9b0 Michael Ellerman 2008-06-24 445 check(instr_is_branch_to_addr(&instr, addr - 4)); ae0dc73625f9b0 Michael Ellerman 2008-06-24 446 /* Largest negative relative branch, - 32 MB */ ae0dc73625f9b0 Michael Ellerman 2008-06-24 447 instr = 0x4a000000; ae0dc73625f9b0 Michael Ellerman 2008-06-24 448 check(instr_is_branch_to_addr(&instr, addr - 0x2000000)); ae0dc73625f9b0 Michael Ellerman 2008-06-24 449 ae0dc73625f9b0 Michael Ellerman 2008-06-24 450 /* Branch to self, with link */ 7c95d8893fb558 Jordan Niethe 2020-05-06 451 err = create_branch(&instr, &instr, addr, BRANCH_SET_LINK); ae0dc73625f9b0 Michael Ellerman 2008-06-24 452 check(instr_is_branch_to_addr(&instr, addr)); ae0dc73625f9b0 Michael Ellerman 2008-06-24 453 ae0dc73625f9b0 Michael Ellerman 2008-06-24 454 /* Branch to self - 0x100, with link */ 7c95d8893fb558 Jordan Niethe 2020-05-06 @455 err = create_branch(&instr, &instr, addr - 0x100, BRANCH_SET_LINK); ae0dc73625f9b0 Michael Ellerman 2008-06-24 456 check(instr_is_branch_to_addr(&instr, addr - 0x100)); ae0dc73625f9b0 Michael Ellerman 2008-06-24 457 ae0dc73625f9b0 Michael Ellerman 2008-06-24 458 /* Branch to self + 0x100, no link */ 7c95d8893fb558 Jordan Niethe 2020-05-06 459 err = create_branch(&instr, &instr, addr + 0x100, 0); ae0dc73625f9b0 Michael Ellerman 2008-06-24 460 check(instr_is_branch_to_addr(&instr, addr + 0x100)); ae0dc73625f9b0 Michael Ellerman 2008-06-24 461 ae0dc73625f9b0 Michael Ellerman 2008-06-24 462 /* Maximum relative negative offset, - 32 MB */ 7c95d8893fb558 Jordan Niethe 2020-05-06 463 err = create_branch(&instr, &instr, addr - 0x2000000, BRANCH_SET_LINK); ae0dc73625f9b0 Michael Ellerman 2008-06-24 464 check(instr_is_branch_to_addr(&instr, addr - 0x2000000)); ae0dc73625f9b0 Michael Ellerman 2008-06-24 465 ae0dc73625f9b0 Michael Ellerman 2008-06-24 466 /* Out of range relative negative offset, - 32 MB + 4*/ 7c95d8893fb558 Jordan Niethe 2020-05-06 467 err = create_branch(&instr, &instr, addr - 0x2000004, BRANCH_SET_LINK); 7c95d8893fb558 Jordan Niethe 2020-05-06 468 check(err); ae0dc73625f9b0 Michael Ellerman 2008-06-24 469 ae0dc73625f9b0 Michael Ellerman 2008-06-24 470 /* Out of range relative positive offset, + 32 MB */ 7c95d8893fb558 Jordan Niethe 2020-05-06 471 err = create_branch(&instr, &instr, addr + 0x2000000, BRANCH_SET_LINK); 7c95d8893fb558 Jordan Niethe 2020-05-06 472 check(err); ae0dc73625f9b0 Michael Ellerman 2008-06-24 473 ae0dc73625f9b0 Michael Ellerman 2008-06-24 474 /* Unaligned target */ 7c95d8893fb558 Jordan Niethe 2020-05-06 475 err = create_branch(&instr, &instr, addr + 3, BRANCH_SET_LINK); 7c95d8893fb558 Jordan Niethe 2020-05-06 476 check(err); ae0dc73625f9b0 Michael Ellerman 2008-06-24 477 ae0dc73625f9b0 Michael Ellerman 2008-06-24 478 /* Check flags are masked correctly */ 7c95d8893fb558 Jordan Niethe 2020-05-06 479 err = create_branch(&instr, &instr, addr, 0xFFFFFFFC); ae0dc73625f9b0 Michael Ellerman 2008-06-24 480 check(instr_is_branch_to_addr(&instr, addr)); ae0dc73625f9b0 Michael Ellerman 2008-06-24 481 check(instr == 0x48000000); ae0dc73625f9b0 Michael Ellerman 2008-06-24 482 } ae0dc73625f9b0 Michael Ellerman 2008-06-24 483 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/[email protected] _______________________________________________ kbuild mailing list -- [email protected] To unsubscribe send an email to [email protected]
