Re: [Y2038] [PATCH v4 02/10] include: Move compat_timespec/ timeval to compat_time.h

From: Deepa Dinamani
Date: Tue Mar 13 2018 - 23:51:12 EST

The file arch/arm64/kernel/process.c needs asm/compat.h also to be
included directly since this is included conditionally from
include/compat.h. This does seem to be typical of arm64 as I was not
completely able to get rid of asm/compat.h includes for arm64 in this
series. My plan is to have separate patches to get rid of asm/compat.h
includes for the architectures that are not straight forward to keep
this series simple.
I will fix this and update the series.

-Deepa


On Tue, Mar 13, 2018 at 8:22 AM, kbuild test robot <lkp@xxxxxxxxx> wrote:
> Hi Deepa,
>
> Thank you for the patch! Yet something to improve:
>
> [auto build test ERROR on ]
>
> url: https://github.com/0day-ci/linux/commits/Deepa-Dinamani/posix_clocks-Prepare-syscalls-for-64-bit-time_t-conversion/20180313-203305
> base:
> config: arm64-allnoconfig (attached as .config)
> compiler: aarch64-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
> reproduce:
> wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> chmod +x ~/bin/make.cross
> # save the attached .config to linux build tree
> make.cross ARCH=arm64
>
> All errors (new ones prefixed by >>):
>
> arch/arm64/kernel/process.c: In function 'copy_thread':
>>> arch/arm64/kernel/process.c:342:8: error: implicit declaration of function 'is_compat_thread'; did you mean 'is_compat_task'? [-Werror=implicit-function-declaration]
> if (is_compat_thread(task_thread_info(p)))
> ^~~~~~~~~~~~~~~~
> is_compat_task
> cc1: some warnings being treated as errors
>
> vim +342 arch/arm64/kernel/process.c
>
> b3901d54d Catalin Marinas 2012-03-05 307
> b3901d54d Catalin Marinas 2012-03-05 308 int copy_thread(unsigned long clone_flags, unsigned long stack_start,
> afa86fc42 Al Viro 2012-10-22 309 unsigned long stk_sz, struct task_struct *p)
> b3901d54d Catalin Marinas 2012-03-05 310 {
> b3901d54d Catalin Marinas 2012-03-05 311 struct pt_regs *childregs = task_pt_regs(p);
> b3901d54d Catalin Marinas 2012-03-05 312
> c34501d21 Catalin Marinas 2012-10-05 313 memset(&p->thread.cpu_context, 0, sizeof(struct cpu_context));
> c34501d21 Catalin Marinas 2012-10-05 314
> bc0ee4760 Dave Martin 2017-10-31 315 /*
> bc0ee4760 Dave Martin 2017-10-31 316 * Unalias p->thread.sve_state (if any) from the parent task
> bc0ee4760 Dave Martin 2017-10-31 317 * and disable discard SVE state for p:
> bc0ee4760 Dave Martin 2017-10-31 318 */
> bc0ee4760 Dave Martin 2017-10-31 319 clear_tsk_thread_flag(p, TIF_SVE);
> bc0ee4760 Dave Martin 2017-10-31 320 p->thread.sve_state = NULL;
> bc0ee4760 Dave Martin 2017-10-31 321
> 071b6d4a5 Dave Martin 2017-12-05 322 /*
> 071b6d4a5 Dave Martin 2017-12-05 323 * In case p was allocated the same task_struct pointer as some
> 071b6d4a5 Dave Martin 2017-12-05 324 * other recently-exited task, make sure p is disassociated from
> 071b6d4a5 Dave Martin 2017-12-05 325 * any cpu that may have run that now-exited task recently.
> 071b6d4a5 Dave Martin 2017-12-05 326 * Otherwise we could erroneously skip reloading the FPSIMD
> 071b6d4a5 Dave Martin 2017-12-05 327 * registers for p.
> 071b6d4a5 Dave Martin 2017-12-05 328 */
> 071b6d4a5 Dave Martin 2017-12-05 329 fpsimd_flush_task_state(p);
> 071b6d4a5 Dave Martin 2017-12-05 330
> 9ac080021 Al Viro 2012-10-21 331 if (likely(!(p->flags & PF_KTHREAD))) {
> 9ac080021 Al Viro 2012-10-21 332 *childregs = *current_pt_regs();
> b3901d54d Catalin Marinas 2012-03-05 333 childregs->regs[0] = 0;
> d00a3810c Will Deacon 2015-05-27 334
> b3901d54d Catalin Marinas 2012-03-05 335 /*
> b3901d54d Catalin Marinas 2012-03-05 336 * Read the current TLS pointer from tpidr_el0 as it may be
> b3901d54d Catalin Marinas 2012-03-05 337 * out-of-sync with the saved value.
> b3901d54d Catalin Marinas 2012-03-05 338 */
> adf758999 Mark Rutland 2016-09-08 339 *task_user_tls(p) = read_sysreg(tpidr_el0);
> d00a3810c Will Deacon 2015-05-27 340
> e0fd18ce1 Al Viro 2012-10-18 341 if (stack_start) {
> d00a3810c Will Deacon 2015-05-27 @342 if (is_compat_thread(task_thread_info(p)))
> d00a3810c Will Deacon 2015-05-27 343 childregs->compat_sp = stack_start;
> d00a3810c Will Deacon 2015-05-27 344 else
> b3901d54d Catalin Marinas 2012-03-05 345 childregs->sp = stack_start;
> b3901d54d Catalin Marinas 2012-03-05 346 }
> d00a3810c Will Deacon 2015-05-27 347
> c34501d21 Catalin Marinas 2012-10-05 348 /*
> c34501d21 Catalin Marinas 2012-10-05 349 * If a TLS pointer was passed to clone (4th argument), use it
> c34501d21 Catalin Marinas 2012-10-05 350 * for the new thread.
> c34501d21 Catalin Marinas 2012-10-05 351 */
> b3901d54d Catalin Marinas 2012-03-05 352 if (clone_flags & CLONE_SETTLS)
> d00a3810c Will Deacon 2015-05-27 353 p->thread.tp_value = childregs->regs[3];
> c34501d21 Catalin Marinas 2012-10-05 354 } else {
> c34501d21 Catalin Marinas 2012-10-05 355 memset(childregs, 0, sizeof(struct pt_regs));
> c34501d21 Catalin Marinas 2012-10-05 356 childregs->pstate = PSR_MODE_EL1h;
> 57f4959ba James Morse 2016-02-05 357 if (IS_ENABLED(CONFIG_ARM64_UAO) &&
> a4023f682 Suzuki K Poulose 2016-11-08 358 cpus_have_const_cap(ARM64_HAS_UAO))
> 57f4959ba James Morse 2016-02-05 359 childregs->pstate |= PSR_UAO_BIT;
> c34501d21 Catalin Marinas 2012-10-05 360 p->thread.cpu_context.x19 = stack_start;
> c34501d21 Catalin Marinas 2012-10-05 361 p->thread.cpu_context.x20 = stk_sz;
> c34501d21 Catalin Marinas 2012-10-05 362 }
> c34501d21 Catalin Marinas 2012-10-05 363 p->thread.cpu_context.pc = (unsigned long)ret_from_fork;
> c34501d21 Catalin Marinas 2012-10-05 364 p->thread.cpu_context.sp = (unsigned long)childregs;
> b3901d54d Catalin Marinas 2012-03-05 365
> b3901d54d Catalin Marinas 2012-03-05 366 ptrace_hw_copy_thread(p);
> b3901d54d Catalin Marinas 2012-03-05 367
> b3901d54d Catalin Marinas 2012-03-05 368 return 0;
> b3901d54d Catalin Marinas 2012-03-05 369 }
> b3901d54d Catalin Marinas 2012-03-05 370
>
> :::::: The code at line 342 was first introduced by commit
> :::::: d00a3810c16207d2541b7796a73cca5a24ea3742 arm64: context-switch user tls register tpidr_el0 for compat tasks
>
> :::::: TO: Will Deacon <will.deacon@xxxxxxx>
> :::::: CC: Catalin Marinas <catalin.marinas@xxxxxxx>
>
> ---
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