arch/arm/kernel/tcm.c:256:13: warning: no previous prototype for function 'tcm_init'

From: kernel test robot
Date: Wed Aug 17 2022 - 07:27:26 EST

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Hi Arnd,

First bad commit (maybe != root cause):

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 3cc40a443a04d52b0c95255dce264068b01e9bfe
commit: 0361c7e504b1fa3c2901643088e2f29c0354ab31 ARM: ep93xx: multiplatform support
date: 5 months ago
config: arm-randconfig-c002-20220815 (https://download.01.org/0day-ci/archive/20220817/202208171922.vDMgonxr-lkp@xxxxxxxxx/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project aed5e3bea138ce581d682158eb61c27b3cfdd6ec)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install arm cross compiling tool for clang build
# apt-get install binutils-arm-linux-gnueabi
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0361c7e504b1fa3c2901643088e2f29c0354ab31
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 0361c7e504b1fa3c2901643088e2f29c0354ab31
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash arch/arm/kernel/ arch/arm/mm/ drivers/irqchip/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

>> arch/arm/kernel/tcm.c:256:13: warning: no previous prototype for function 'tcm_init' [-Wmissing-prototypes]
void __init tcm_init(void)
^
arch/arm/kernel/tcm.c:256:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void __init tcm_init(void)
^
static
1 warning generated.
--
>> arch/arm/mm/copypage-v4wb.c:47:6: warning: no previous prototype for function 'v4wb_copy_user_highpage' [-Wmissing-prototypes]
void v4wb_copy_user_highpage(struct page *to, struct page *from,
^
arch/arm/mm/copypage-v4wb.c:47:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void v4wb_copy_user_highpage(struct page *to, struct page *from,
^
static
>> arch/arm/mm/copypage-v4wb.c:65:6: warning: no previous prototype for function 'v4wb_clear_user_highpage' [-Wmissing-prototypes]
void v4wb_clear_user_highpage(struct page *page, unsigned long vaddr)
^
arch/arm/mm/copypage-v4wb.c:65:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void v4wb_clear_user_highpage(struct page *page, unsigned long vaddr)
^
static
2 warnings generated.
--
>> arch/arm/mm/copypage-fa.c:38:6: warning: no previous prototype for function 'fa_copy_user_highpage' [-Wmissing-prototypes]
void fa_copy_user_highpage(struct page *to, struct page *from,
^
arch/arm/mm/copypage-fa.c:38:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void fa_copy_user_highpage(struct page *to, struct page *from,
^
static
>> arch/arm/mm/copypage-fa.c:55:6: warning: no previous prototype for function 'fa_clear_user_highpage' [-Wmissing-prototypes]
void fa_clear_user_highpage(struct page *page, unsigned long vaddr)
^
arch/arm/mm/copypage-fa.c:55:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void fa_clear_user_highpage(struct page *page, unsigned long vaddr)
^
static
2 warnings generated.
--
drivers/irqchip/irq-ftintc010.c:128:39: warning: no previous prototype for function 'ft010_irqchip_handle_irq' [-Wmissing-prototypes]
asmlinkage void __exception_irq_entry ft010_irqchip_handle_irq(struct pt_regs *regs)
^
drivers/irqchip/irq-ftintc010.c:128:12: note: declare 'static' if the function is not intended to be used outside of this translation unit
asmlinkage void __exception_irq_entry ft010_irqchip_handle_irq(struct pt_regs *regs)
^
static
>> drivers/irqchip/irq-ftintc010.c:165:12: warning: no previous prototype for function 'ft010_of_init_irq' [-Wmissing-prototypes]
int __init ft010_of_init_irq(struct device_node *node,
^
drivers/irqchip/irq-ftintc010.c:165:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
int __init ft010_of_init_irq(struct device_node *node,
^
static
2 warnings generated.

vim +/tcm_init +256 arch/arm/kernel/tcm.c

0bbe6b5a73c00f8 Michael van der Westhuizen 2015-06-04 252
bc581770cfdd8c1 Linus Walleij 2009-09-15 253 /*
bc581770cfdd8c1 Linus Walleij 2009-09-15 254 * This initializes the TCM memory
bc581770cfdd8c1 Linus Walleij 2009-09-15 255 */
bc581770cfdd8c1 Linus Walleij 2009-09-15 @256 void __init tcm_init(void)
bc581770cfdd8c1 Linus Walleij 2009-09-15 257 {
90b9222ec632bc8 Linus Walleij 2011-12-12 258 u32 tcm_status;
90b9222ec632bc8 Linus Walleij 2011-12-12 259 u8 dtcm_banks;
90b9222ec632bc8 Linus Walleij 2011-12-12 260 u8 itcm_banks;
9715efb8dc9ffa6 Linus Walleij 2011-07-01 261 size_t dtcm_code_sz = &__edtcm_data - &__sdtcm_data;
9715efb8dc9ffa6 Linus Walleij 2011-07-01 262 size_t itcm_code_sz = &__eitcm_text - &__sitcm_text;
bc581770cfdd8c1 Linus Walleij 2009-09-15 263 char *start;
bc581770cfdd8c1 Linus Walleij 2009-09-15 264 char *end;
bc581770cfdd8c1 Linus Walleij 2009-09-15 265 char *ram;
1dbd30e9890fd69 Linus Walleij 2010-07-12 266 int ret;
598509779e5b803 Linus Walleij 2010-07-12 267 int i;
bc581770cfdd8c1 Linus Walleij 2009-09-15 268
90b9222ec632bc8 Linus Walleij 2011-12-12 269 /*
90b9222ec632bc8 Linus Walleij 2011-12-12 270 * Prior to ARMv5 there is no TCM, and trying to read the status
90b9222ec632bc8 Linus Walleij 2011-12-12 271 * register will hang the processor.
90b9222ec632bc8 Linus Walleij 2011-12-12 272 */
90b9222ec632bc8 Linus Walleij 2011-12-12 273 if (cpu_architecture() < CPU_ARCH_ARMv5) {
90b9222ec632bc8 Linus Walleij 2011-12-12 274 if (dtcm_code_sz || itcm_code_sz)
90b9222ec632bc8 Linus Walleij 2011-12-12 275 pr_info("CPU TCM: %u bytes of DTCM and %u bytes of "
90b9222ec632bc8 Linus Walleij 2011-12-12 276 "ITCM code compiled in, but no TCM present "
90b9222ec632bc8 Linus Walleij 2011-12-12 277 "in pre-v5 CPU\n", dtcm_code_sz, itcm_code_sz);
90b9222ec632bc8 Linus Walleij 2011-12-12 278 return;
90b9222ec632bc8 Linus Walleij 2011-12-12 279 }
90b9222ec632bc8 Linus Walleij 2011-12-12 280
90b9222ec632bc8 Linus Walleij 2011-12-12 281 tcm_status = read_cpuid_tcmstatus();
0bbe6b5a73c00f8 Michael van der Westhuizen 2015-06-04 282
0bbe6b5a73c00f8 Michael van der Westhuizen 2015-06-04 283 /*
0bbe6b5a73c00f8 Michael van der Westhuizen 2015-06-04 284 * This code only supports v6-compatible TCMTR implementations.
0bbe6b5a73c00f8 Michael van der Westhuizen 2015-06-04 285 */
0bbe6b5a73c00f8 Michael van der Westhuizen 2015-06-04 286 if (tcm_status & TCMTR_FORMAT_MASK)
0bbe6b5a73c00f8 Michael van der Westhuizen 2015-06-04 287 return;
0bbe6b5a73c00f8 Michael van der Westhuizen 2015-06-04 288
90b9222ec632bc8 Linus Walleij 2011-12-12 289 dtcm_banks = (tcm_status >> 16) & 0x03;
90b9222ec632bc8 Linus Walleij 2011-12-12 290 itcm_banks = (tcm_status & 0x03);
90b9222ec632bc8 Linus Walleij 2011-12-12 291
0bbe6b5a73c00f8 Michael van der Westhuizen 2015-06-04 292 register_undef_hook(&tcm_hook);
0bbe6b5a73c00f8 Michael van der Westhuizen 2015-06-04 293
9715efb8dc9ffa6 Linus Walleij 2011-07-01 294 /* Values greater than 2 for D/ITCM banks are "reserved" */
9715efb8dc9ffa6 Linus Walleij 2011-07-01 295 if (dtcm_banks > 2)
9715efb8dc9ffa6 Linus Walleij 2011-07-01 296 dtcm_banks = 0;
9715efb8dc9ffa6 Linus Walleij 2011-07-01 297 if (itcm_banks > 2)
9715efb8dc9ffa6 Linus Walleij 2011-07-01 298 itcm_banks = 0;
9715efb8dc9ffa6 Linus Walleij 2011-07-01 299
bc581770cfdd8c1 Linus Walleij 2009-09-15 300 /* Setup DTCM if present */
1dbd30e9890fd69 Linus Walleij 2010-07-12 301 if (dtcm_banks > 0) {
598509779e5b803 Linus Walleij 2010-07-12 302 for (i = 0; i < dtcm_banks; i++) {
1dbd30e9890fd69 Linus Walleij 2010-07-12 303 ret = setup_tcm_bank(0, i, dtcm_banks, &dtcm_end);
1dbd30e9890fd69 Linus Walleij 2010-07-12 304 if (ret)
0bbe6b5a73c00f8 Michael van der Westhuizen 2015-06-04 305 goto unregister;
1dbd30e9890fd69 Linus Walleij 2010-07-12 306 }
9715efb8dc9ffa6 Linus Walleij 2011-07-01 307 /* This means you compiled more code than fits into DTCM */
9715efb8dc9ffa6 Linus Walleij 2011-07-01 308 if (dtcm_code_sz > (dtcm_end - DTCM_OFFSET)) {
9715efb8dc9ffa6 Linus Walleij 2011-07-01 309 pr_info("CPU DTCM: %u bytes of code compiled to "
9715efb8dc9ffa6 Linus Walleij 2011-07-01 310 "DTCM but only %lu bytes of DTCM present\n",
9715efb8dc9ffa6 Linus Walleij 2011-07-01 311 dtcm_code_sz, (dtcm_end - DTCM_OFFSET));
9715efb8dc9ffa6 Linus Walleij 2011-07-01 312 goto no_dtcm;
9715efb8dc9ffa6 Linus Walleij 2011-07-01 313 }
0bbe6b5a73c00f8 Michael van der Westhuizen 2015-06-04 314 /*
0bbe6b5a73c00f8 Michael van der Westhuizen 2015-06-04 315 * This means that the DTCM sizes were 0 or the DTCM banks
0bbe6b5a73c00f8 Michael van der Westhuizen 2015-06-04 316 * were inaccessible due to TrustZone configuration.
0bbe6b5a73c00f8 Michael van der Westhuizen 2015-06-04 317 */
0bbe6b5a73c00f8 Michael van der Westhuizen 2015-06-04 318 if (!(dtcm_end - DTCM_OFFSET))
0bbe6b5a73c00f8 Michael van der Westhuizen 2015-06-04 319 goto no_dtcm;
1dbd30e9890fd69 Linus Walleij 2010-07-12 320 dtcm_res.end = dtcm_end - 1;
bc581770cfdd8c1 Linus Walleij 2009-09-15 321 request_resource(&iomem_resource, &dtcm_res);
1dbd30e9890fd69 Linus Walleij 2010-07-12 322 dtcm_iomap[0].length = dtcm_end - DTCM_OFFSET;
bc581770cfdd8c1 Linus Walleij 2009-09-15 323 iotable_init(dtcm_iomap, 1);
bc581770cfdd8c1 Linus Walleij 2009-09-15 324 /* Copy data from RAM to DTCM */
bc581770cfdd8c1 Linus Walleij 2009-09-15 325 start = &__sdtcm_data;
bc581770cfdd8c1 Linus Walleij 2009-09-15 326 end = &__edtcm_data;
bc581770cfdd8c1 Linus Walleij 2009-09-15 327 ram = &__dtcm_start;
9715efb8dc9ffa6 Linus Walleij 2011-07-01 328 memcpy(start, ram, dtcm_code_sz);
9715efb8dc9ffa6 Linus Walleij 2011-07-01 329 pr_debug("CPU DTCM: copied data from %p - %p\n",
9715efb8dc9ffa6 Linus Walleij 2011-07-01 330 start, end);
201043f227576d4 Linus Walleij 2011-07-01 331 dtcm_present = true;
9715efb8dc9ffa6 Linus Walleij 2011-07-01 332 } else if (dtcm_code_sz) {
9715efb8dc9ffa6 Linus Walleij 2011-07-01 333 pr_info("CPU DTCM: %u bytes of code compiled to DTCM but no "
9715efb8dc9ffa6 Linus Walleij 2011-07-01 334 "DTCM banks present in CPU\n", dtcm_code_sz);
bc581770cfdd8c1 Linus Walleij 2009-09-15 335 }
bc581770cfdd8c1 Linus Walleij 2009-09-15 336
9715efb8dc9ffa6 Linus Walleij 2011-07-01 337 no_dtcm:
bc581770cfdd8c1 Linus Walleij 2009-09-15 338 /* Setup ITCM if present */
1dbd30e9890fd69 Linus Walleij 2010-07-12 339 if (itcm_banks > 0) {
598509779e5b803 Linus Walleij 2010-07-12 340 for (i = 0; i < itcm_banks; i++) {
1dbd30e9890fd69 Linus Walleij 2010-07-12 341 ret = setup_tcm_bank(1, i, itcm_banks, &itcm_end);
1dbd30e9890fd69 Linus Walleij 2010-07-12 342 if (ret)
0bbe6b5a73c00f8 Michael van der Westhuizen 2015-06-04 343 goto unregister;
1dbd30e9890fd69 Linus Walleij 2010-07-12 344 }
9715efb8dc9ffa6 Linus Walleij 2011-07-01 345 /* This means you compiled more code than fits into ITCM */
9715efb8dc9ffa6 Linus Walleij 2011-07-01 346 if (itcm_code_sz > (itcm_end - ITCM_OFFSET)) {
9715efb8dc9ffa6 Linus Walleij 2011-07-01 347 pr_info("CPU ITCM: %u bytes of code compiled to "
9715efb8dc9ffa6 Linus Walleij 2011-07-01 348 "ITCM but only %lu bytes of ITCM present\n",
9715efb8dc9ffa6 Linus Walleij 2011-07-01 349 itcm_code_sz, (itcm_end - ITCM_OFFSET));
0bbe6b5a73c00f8 Michael van der Westhuizen 2015-06-04 350 goto unregister;
9715efb8dc9ffa6 Linus Walleij 2011-07-01 351 }
0bbe6b5a73c00f8 Michael van der Westhuizen 2015-06-04 352 /*
0bbe6b5a73c00f8 Michael van der Westhuizen 2015-06-04 353 * This means that the ITCM sizes were 0 or the ITCM banks
0bbe6b5a73c00f8 Michael van der Westhuizen 2015-06-04 354 * were inaccessible due to TrustZone configuration.
0bbe6b5a73c00f8 Michael van der Westhuizen 2015-06-04 355 */
0bbe6b5a73c00f8 Michael van der Westhuizen 2015-06-04 356 if (!(itcm_end - ITCM_OFFSET))
0bbe6b5a73c00f8 Michael van der Westhuizen 2015-06-04 357 goto unregister;
1dbd30e9890fd69 Linus Walleij 2010-07-12 358 itcm_res.end = itcm_end - 1;
bc581770cfdd8c1 Linus Walleij 2009-09-15 359 request_resource(&iomem_resource, &itcm_res);
1dbd30e9890fd69 Linus Walleij 2010-07-12 360 itcm_iomap[0].length = itcm_end - ITCM_OFFSET;
bc581770cfdd8c1 Linus Walleij 2009-09-15 361 iotable_init(itcm_iomap, 1);
bc581770cfdd8c1 Linus Walleij 2009-09-15 362 /* Copy code from RAM to ITCM */
bc581770cfdd8c1 Linus Walleij 2009-09-15 363 start = &__sitcm_text;
bc581770cfdd8c1 Linus Walleij 2009-09-15 364 end = &__eitcm_text;
bc581770cfdd8c1 Linus Walleij 2009-09-15 365 ram = &__itcm_start;
9715efb8dc9ffa6 Linus Walleij 2011-07-01 366 memcpy(start, ram, itcm_code_sz);
9715efb8dc9ffa6 Linus Walleij 2011-07-01 367 pr_debug("CPU ITCM: copied code from %p - %p\n",
9715efb8dc9ffa6 Linus Walleij 2011-07-01 368 start, end);
201043f227576d4 Linus Walleij 2011-07-01 369 itcm_present = true;
9715efb8dc9ffa6 Linus Walleij 2011-07-01 370 } else if (itcm_code_sz) {
9715efb8dc9ffa6 Linus Walleij 2011-07-01 371 pr_info("CPU ITCM: %u bytes of code compiled to ITCM but no "
9715efb8dc9ffa6 Linus Walleij 2011-07-01 372 "ITCM banks present in CPU\n", itcm_code_sz);
bc581770cfdd8c1 Linus Walleij 2009-09-15 373 }
0bbe6b5a73c00f8 Michael van der Westhuizen 2015-06-04 374
0bbe6b5a73c00f8 Michael van der Westhuizen 2015-06-04 375 unregister:
0bbe6b5a73c00f8 Michael van der Westhuizen 2015-06-04 376 unregister_undef_hook(&tcm_hook);
bc581770cfdd8c1 Linus Walleij 2009-09-15 377 }
bc581770cfdd8c1 Linus Walleij 2009-09-15 378

:::::: The code at line 256 was first introduced by commit
:::::: bc581770cfdd8c17ea17d324dc05e2f9c599e7ca ARM: 5580/2: ARM TCM (Tightly-Coupled Memory) support v3

:::::: TO: Linus Walleij <linus.walleij@xxxxxxxxxxxxxx>
:::::: CC: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>

--
0-DAY CI Kernel Test Service
https://01.org/lkp

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