Hi Mickaël, [auto build test ERROR on net-next/master] url: https://github.com/0day-ci/linux/commits/Micka-l-Sala-n/Landlock-LSM-Toward-unprivileged-sandboxing/20170329-211258 config: i386-allmodconfig (attached as .config) compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901 reproduce: # save the attached .config to linux build tree make ARCH=i386 All error/warnings (new ones prefixed by >>): In file included from security/landlock/hooks.c:12:0: security/landlock/hooks.c: In function 'landlock_decide': >> arch/x86/include/asm/processor.h:824:39: error: implicit declaration of function 'task_stack_page' [-Werror=implicit-function-declaration] unsigned long __ptr = (unsigned long)task_stack_page(task); \ ^ >> security/landlock/hooks.c:107:41: note: in expansion of macro 'task_pt_regs' .syscall_nr = syscall_get_nr(current, task_pt_regs(current)), ^~~~~~~~~~~~ security/landlock/hooks.c:104:26: warning: unused variable 'ctx' [-Wunused-variable] struct landlock_context ctx = { ^~~ security/landlock/hooks.c:102:6: warning: unused variable 'event_idx' [-Wunused-variable] u32 event_idx = get_index(event); ^~~~~~~~~ cc1: some warnings being treated as errors vim +/task_stack_page +824 arch/x86/include/asm/processor.h 2f66dcc9 include/asm-x86/processor.h Glauber de Oliveira Costa 2008-01-30 818 * Therefore beware: accessing the ss/esp fields of the 2f66dcc9 include/asm-x86/processor.h Glauber de Oliveira Costa 2008-01-30 819 * "struct pt_regs" is possible, but they may contain the 2f66dcc9 include/asm-x86/processor.h Glauber de Oliveira Costa 2008-01-30 820 * completely wrong values. 2f66dcc9 include/asm-x86/processor.h Glauber de Oliveira Costa 2008-01-30 821 */ 2f66dcc9 include/asm-x86/processor.h Glauber de Oliveira Costa 2008-01-30 822 #define task_pt_regs(task) \ 2f66dcc9 include/asm-x86/processor.h Glauber de Oliveira Costa 2008-01-30 823 ({ \ 5c39403e arch/x86/include/asm/processor.h Denys Vlasenko 2015-03-13 @824 unsigned long __ptr = (unsigned long)task_stack_page(task); \ 5c39403e arch/x86/include/asm/processor.h Denys Vlasenko 2015-03-13 825 __ptr += THREAD_SIZE - TOP_OF_KERNEL_STACK_PADDING; \ 5c39403e arch/x86/include/asm/processor.h Denys Vlasenko 2015-03-13 826 ((struct pt_regs *)__ptr) - 1; \ 2f66dcc9 include/asm-x86/processor.h Glauber de Oliveira Costa 2008-01-30 827 }) :::::: The code at line 824 was first introduced by commit :::::: 5c39403e004bec75ce0c549541be5479595d6ad0 x86/asm/entry: Simplify task_pt_regs() macro definition :::::: TO: Denys Vlasenko <dvlasenk@xxxxxxxxxx> :::::: CC: Ingo Molnar <mingo@xxxxxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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