Hi Igor, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on next-20180223] [cannot apply to linus/master mmotm/master char-misc/char-misc-testing v4.16-rc3 v4.16-rc2 v4.16-rc1 v4.16-rc3] [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/Igor-Stoppa/mm-security-ro-protection-for-dynamic-data/20180302-232215 reproduce: # apt-get install sparse make ARCH=x86_64 allmodconfig make C=1 CF=-D__CHECK_ENDIAN__ sparse warnings: (new ones prefixed by >>) lib/genalloc.c:624:29: sparse: undefined identifier 'exit_test' >> lib/genalloc.c:624:29: sparse: call with no type! In file included from arch/x86/include/asm/bug.h:83:0, from include/linux/bug.h:5, from include/linux/mmdebug.h:5, from include/linux/gfp.h:5, from include/linux/slab.h:15, from lib/genalloc.c:99: lib/genalloc.c: In function 'gen_pool_free': lib/genalloc.c:616:10: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'struct gen_pool *' [-Wformat=] "Trying to free unallocated memory" ^ include/asm-generic/bug.h:98:50: note: in definition of macro '__WARN_printf' #define __WARN_printf(arg...) do { __warn_printk(arg); __WARN(); } while (0) ^~~ lib/genalloc.c:615:5: note: in expansion of macro 'WARN' WARN(true, ^~~~ lib/genalloc.c:617:23: note: format string is defined here " from pool %s", pool); ~^ In file included from include/asm-generic/bug.h:5:0, from arch/x86/include/asm/bug.h:83, from include/linux/bug.h:5, from include/linux/mmdebug.h:5, from include/linux/gfp.h:5, from include/linux/slab.h:15, from lib/genalloc.c:99: lib/genalloc.c:624:17: error: implicit declaration of function 'exit_test'; did you mean 'exit_sem'? [-Werror=implicit-function-declaration] if (unlikely(exit_test(boundary < 0))) { ^ include/linux/compiler.h:77:42: note: in definition of macro 'unlikely' # define unlikely(x) __builtin_expect(!!(x), 0) ^ In file included from arch/x86/include/asm/bug.h:83:0, from include/linux/bug.h:5, from include/linux/mmdebug.h:5, from include/linux/gfp.h:5, from include/linux/slab.h:15, from lib/genalloc.c:99: lib/genalloc.c:626:16: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'struct gen_pool *' [-Wformat=] WARN(true, "Corrupted pool %s", pool); ^ include/asm-generic/bug.h:98:50: note: in definition of macro '__WARN_printf' #define __WARN_printf(arg...) do { __warn_printk(arg); __WARN(); } while (0) ^~~ lib/genalloc.c:626:5: note: in expansion of macro 'WARN' WARN(true, "Corrupted pool %s", pool); ^~~~ lib/genalloc.c:634:10: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'struct gen_pool *' [-Wformat=] "Size provided differs from size " ^ include/asm-generic/bug.h:98:50: note: in definition of macro '__WARN_printf' #define __WARN_printf(arg...) do { __warn_printk(arg); __WARN(); } while (0) ^~~ lib/genalloc.c:633:5: note: in expansion of macro 'WARN' WARN(true, ^~~~ lib/genalloc.c:635:31: note: format string is defined here "measured from pool %s", pool); ~^ In file included from arch/x86/include/asm/bug.h:83:0, from include/linux/bug.h:5, from include/linux/mmdebug.h:5, from include/linux/gfp.h:5, from include/linux/slab.h:15, from lib/genalloc.c:99: lib/genalloc.c:643:10: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'struct gen_pool *' [-Wformat=] "Unexpected bitmap collision while" ^ include/asm-generic/bug.h:98:50: note: in definition of macro '__WARN_printf' #define __WARN_printf(arg...) do { __warn_printk(arg); __WARN(); } while (0) ^~~ lib/genalloc.c:642:5: note: in expansion of macro 'WARN' WARN(true, ^~~~ lib/genalloc.c:644:36: note: format string is defined here " freeing memory in pool %s", pool); ~^ cc1: some warnings being treated as errors vim +624 lib/genalloc.c 929f9727 Dean Nelson 2006-06-23 609 7f184275 Huang Ying 2011-07-13 610 rcu_read_lock(); 7f184275 Huang Ying 2011-07-13 611 list_for_each_entry_rcu(chunk, &pool->chunks, next_chunk) { 674470d9 Joonyoung Shim 2013-09-11 612 if (addr >= chunk->start_addr && addr <= chunk->end_addr) { 3406f868 Igor Stoppa 2018-02-28 613 if (unlikely(addr + size - 1 > chunk->end_addr)) { 7f184275 Huang Ying 2011-07-13 614 rcu_read_unlock(); 3406f868 Igor Stoppa 2018-02-28 615 WARN(true, 3406f868 Igor Stoppa 2018-02-28 616 "Trying to free unallocated memory" 3406f868 Igor Stoppa 2018-02-28 617 " from pool %s", pool); 7f184275 Huang Ying 2011-07-13 618 return; f14f75b8 Jes Sorensen 2005-06-21 619 } 3406f868 Igor Stoppa 2018-02-28 620 start_entry = (addr - chunk->start_addr) >> order; 3406f868 Igor Stoppa 2018-02-28 621 remaining_entries = (chunk->end_addr - addr) >> order; 3406f868 Igor Stoppa 2018-02-28 622 boundary = get_boundary(chunk->entries, start_entry, 3406f868 Igor Stoppa 2018-02-28 623 remaining_entries); 3406f868 Igor Stoppa 2018-02-28 @624 if (unlikely(exit_test(boundary < 0))) { 3406f868 Igor Stoppa 2018-02-28 625 rcu_read_unlock(); 3406f868 Igor Stoppa 2018-02-28 626 WARN(true, "Corrupted pool %s", pool); 3406f868 Igor Stoppa 2018-02-28 627 return; f14f75b8 Jes Sorensen 2005-06-21 628 } 3406f868 Igor Stoppa 2018-02-28 629 nentries = boundary - start_entry; 3406f868 Igor Stoppa 2018-02-28 630 if (unlikely(size && (nentries != 3406f868 Igor Stoppa 2018-02-28 631 mem_to_units(size, order)))) { 7f184275 Huang Ying 2011-07-13 632 rcu_read_unlock(); 3406f868 Igor Stoppa 2018-02-28 633 WARN(true, 3406f868 Igor Stoppa 2018-02-28 634 "Size provided differs from size " 3406f868 Igor Stoppa 2018-02-28 635 "measured from pool %s", pool); 3406f868 Igor Stoppa 2018-02-28 636 return; 3406f868 Igor Stoppa 2018-02-28 637 } 3406f868 Igor Stoppa 2018-02-28 638 remain = alter_bitmap_ll(CLEAR_BITS, chunk->entries, 3406f868 Igor Stoppa 2018-02-28 639 start_entry, nentries); 3406f868 Igor Stoppa 2018-02-28 640 if (unlikely(remain)) { 3406f868 Igor Stoppa 2018-02-28 641 rcu_read_unlock(); 3406f868 Igor Stoppa 2018-02-28 642 WARN(true, 3406f868 Igor Stoppa 2018-02-28 643 "Unexpected bitmap collision while" 3406f868 Igor Stoppa 2018-02-28 644 " freeing memory in pool %s", pool); 3406f868 Igor Stoppa 2018-02-28 645 return; 3406f868 Igor Stoppa 2018-02-28 646 } 3406f868 Igor Stoppa 2018-02-28 647 atomic_long_add(nentries << order, &chunk->avail); 3406f868 Igor Stoppa 2018-02-28 648 rcu_read_unlock(); 3406f868 Igor Stoppa 2018-02-28 649 return; 3406f868 Igor Stoppa 2018-02-28 650 } 3406f868 Igor Stoppa 2018-02-28 651 } 3406f868 Igor Stoppa 2018-02-28 652 rcu_read_unlock(); 3406f868 Igor Stoppa 2018-02-28 653 WARN(true, "address not found in pool %s", pool->name); f14f75b8 Jes Sorensen 2005-06-21 654 } f14f75b8 Jes Sorensen 2005-06-21 655 EXPORT_SYMBOL(gen_pool_free); 7f184275 Huang Ying 2011-07-13 656 :::::: The code at line 624 was first introduced by commit :::::: 3406f8684f722bb52edc94f65976585acb6382ce genalloc: track beginning of allocations :::::: TO: Igor Stoppa <igor.stoppa@xxxxxxxxxx> :::::: CC: 0day robot <fengguang.wu@xxxxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. 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