From: kernel test robot <lkp@intel.com>
To: oe-kbuild@lists.linux.dev
Cc: lkp@intel.com
Subject: Re: [PATCH v2 2/5] drivers: mmc: sdhci-cadence: SD6 controller support
Date: Wed, 22 Feb 2023 10:25:59 +0800 [thread overview]
Message-ID: <202302221028.d3j2yIaZ-lkp@intel.com> (raw)
::::::
:::::: Manual check reason: "low confidence static check warning: drivers/mmc/host/sdhci-cadence.c:517:2: warning: Value stored to 'clk_wr_delay' is never read [clang-analyzer-deadcode.DeadStores]"
::::::
BCC: lkp@intel.com
CC: llvm@lists.linux.dev
CC: oe-kbuild-all@lists.linux.dev
In-Reply-To: <20230123192735.21136-3-pmalgujar@marvell.com>
References: <20230123192735.21136-3-pmalgujar@marvell.com>
TO: Piyush Malgujar <pmalgujar@marvell.com>
TO: linux-mmc@vger.kernel.org
TO: linux-kernel@vger.kernel.org
TO: adrian.hunter@intel.com
TO: ulf.hansson@linaro.org
TO: robh+dt@kernel.org
TO: krzysztof.kozlowski+dt@linaro.org
TO: yamada.masahiro@socionext.com
TO: devicetree@vger.kernel.org
CC: jannadurai@marvell.com
CC: cchavva@marvell.com
CC: Dhananjay Kangude <dkangude@cadence.com>
CC: Piyush Malgujar <pmalgujar@marvell.com>
Hi Piyush,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on robh/for-next]
[also build test WARNING on v6.2 next-20230221]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Piyush-Malgujar/drivers-mmc-sdhci-cadence-Reformat-the-code/20230124-033018
base: https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
patch link: https://lore.kernel.org/r/20230123192735.21136-3-pmalgujar%40marvell.com
patch subject: [PATCH v2 2/5] drivers: mmc: sdhci-cadence: SD6 controller support
:::::: branch date: 4 weeks ago
:::::: commit date: 4 weeks ago
config: mips-randconfig-c004-20230219 (https://download.01.org/0day-ci/archive/20230222/202302221028.d3j2yIaZ-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project db89896bbbd2251fff457699635acbbedeead27f)
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 mips cross compiling tool for clang build
# apt-get install binutils-mips-linux-gnu
# https://github.com/intel-lab-lkp/linux/commit/f5412b4632762b21dc57b4ad59e41880a0ffad53
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review Piyush-Malgujar/drivers-mmc-sdhci-cadence-Reformat-the-code/20230124-033018
git checkout f5412b4632762b21dc57b4ad59e41880a0ffad53
# save the config file
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips clang-analyzer olddefconfig
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips clang-analyzer
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/r/202302221028.d3j2yIaZ-lkp@intel.com/
clang_analyzer warnings: (new ones prefixed by >>)
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fs/fcntl.c:291:2: note: 'h' declared without an initial value
u64 h;
^~~~~
fs/fcntl.c:293:2: note: Control jumps to 'case 1036:' at line 299
switch (cmd) {
^
fs/fcntl.c:300:7: note: Calling 'copy_from_user'
if (copy_from_user(&h, argp, sizeof(h)))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/uaccess.h:160:2: note: Taking true branch
if (check_copy_size(to, n, false))
^
include/linux/uaccess.h:161:7: note: Calling '_copy_from_user'
n = _copy_from_user(to, from, n);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/uaccess.h:125:6: note: Left side of '&&' is true
if (!should_fail_usercopy() && likely(access_ok(from, n))) {
^
include/linux/uaccess.h:125:40: note: Assuming the condition is false
if (!should_fail_usercopy() && likely(access_ok(from, n))) {
^
include/asm-generic/access_ok.h:45:31: note: expanded from macro 'access_ok'
#define access_ok(addr, size) likely(__access_ok(addr, size))
^
include/linux/compiler.h:45:22: note: expanded from macro 'likely'
# define likely(x) (__branch_check__(x, 1, __builtin_constant_p(x)))
^
include/linux/compiler.h:33:32: note: expanded from macro '__branch_check__'
______r = __builtin_expect(!!(x), expect); \
^
include/linux/compiler.h:45:39: note: expanded from macro 'likely'
# define likely(x) (__branch_check__(x, 1, __builtin_constant_p(x)))
~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler.h:33:34: note: expanded from macro '__branch_check__'
______r = __builtin_expect(!!(x), expect); \
^
include/linux/uaccess.h:125:40: note: Assuming the condition is false
if (!should_fail_usercopy() && likely(access_ok(from, n))) {
^
include/asm-generic/access_ok.h:45:31: note: expanded from macro 'access_ok'
#define access_ok(addr, size) likely(__access_ok(addr, size))
^
include/linux/compiler.h:45:22: note: expanded from macro 'likely'
# define likely(x) (__branch_check__(x, 1, __builtin_constant_p(x)))
^
include/linux/compiler.h:33:32: note: expanded from macro '__branch_check__'
______r = __builtin_expect(!!(x), expect); \
^
include/linux/compiler.h:45:66: note: expanded from macro 'likely'
# define likely(x) (__branch_check__(x, 1, __builtin_constant_p(x)))
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~
include/linux/compiler.h:35:19: note: expanded from macro '__branch_check__'
expect, is_constant); \
^~~~~~~~~~~
include/linux/uaccess.h:125:2: note: Taking true branch
if (!should_fail_usercopy() && likely(access_ok(from, n))) {
^
include/linux/uaccess.h:127:9: note: Calling 'raw_copy_from_user'
res = raw_copy_from_user(to, from, n);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/mips/include/asm/uaccess.h:412:2: note: Returning without writing to '*to'
return __cu_len_r;
^
include/linux/uaccess.h:127:9: note: Returning from 'raw_copy_from_user'
res = raw_copy_from_user(to, from, n);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/uaccess.h:130:6: note: Assuming 'res' is 0
if (unlikely(res))
^
include/linux/compiler.h:48:24: note: expanded from macro 'unlikely'
# define unlikely(x) (__branch_check__(x, 0, __builtin_constant_p(x)))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler.h:33:32: note: expanded from macro '__branch_check__'
______r = __builtin_expect(!!(x), expect); \
^~~~
include/linux/uaccess.h:130:2: note: Taking false branch
if (unlikely(res))
^
include/linux/uaccess.h:132:2: note: Returning without writing to '*to'
return res;
^
include/linux/uaccess.h:161:7: note: Returning from '_copy_from_user'
n = _copy_from_user(to, from, n);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/uaccess.h:162:2: note: Returning without writing to '*to'
return n;
^
fs/fcntl.c:300:7: note: Returning from 'copy_from_user'
if (copy_from_user(&h, argp, sizeof(h)))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fs/fcntl.c:300:3: note: Taking false branch
if (copy_from_user(&h, argp, sizeof(h)))
^
fs/fcntl.c:302:8: note: Assigned value is garbage or undefined
hint = (enum rw_hint) h;
^ ~~~~~~~~~~~~~~~~
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
7 warnings generated.
>> drivers/mmc/host/sdhci-cadence.c:517:2: warning: Value stored to 'clk_wr_delay' is never read [clang-analyzer-deadcode.DeadStores]
clk_wr_delay = 0;
^ ~
drivers/mmc/host/sdhci-cadence.c:517:2: note: Value stored to 'clk_wr_delay' is never read
clk_wr_delay = 0;
^ ~
>> drivers/mmc/host/sdhci-cadence.c:996:2: warning: Value stored to 'reg' is never read [clang-analyzer-deadcode.DeadStores]
reg = 0x0;
^ ~~~
drivers/mmc/host/sdhci-cadence.c:996:2: note: Value stored to 'reg' is never read
reg = 0x0;
^ ~~~
drivers/mmc/host/sdhci-cadence.c:1065:2: warning: Value stored to 'reg' is never read [clang-analyzer-deadcode.DeadStores]
reg = 0x0;
^ ~~~
drivers/mmc/host/sdhci-cadence.c:1065:2: note: Value stored to 'reg' is never read
reg = 0x0;
^ ~~~
drivers/mmc/host/sdhci-cadence.c:1070:3: warning: Value stored to 'reg' is never read [clang-analyzer-deadcode.DeadStores]
reg = 0x0;
^ ~~~
drivers/mmc/host/sdhci-cadence.c:1070:3: note: Value stored to 'reg' is never read
reg = 0x0;
^ ~~~
drivers/mmc/host/sdhci-cadence.c:1093:2: warning: Value stored to 'reg' is never read [clang-analyzer-deadcode.DeadStores]
reg = 0x0;
^ ~~~
drivers/mmc/host/sdhci-cadence.c:1093:2: note: Value stored to 'reg' is never read
reg = 0x0;
^ ~~~
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
3 warnings generated.
drivers/mmc/host/sdhci-of-aspeed.c:283:2: warning: 2nd function call argument is an uninitialized value [clang-analyzer-core.CallAndMessage]
aspeed_sdhci_configure_phase(host, bus);
^ ~~~
drivers/mmc/host/sdhci-of-aspeed.c:239:24: note: 'bus' declared without an initial value
unsigned long parent, bus;
^~~
drivers/mmc/host/sdhci-of-aspeed.c:251:6: note: Assuming 'clock' is not equal to 0
if (clock == 0)
^~~~~~~~~~
drivers/mmc/host/sdhci-of-aspeed.c:251:2: note: Taking false branch
if (clock == 0)
^
drivers/mmc/host/sdhci-of-aspeed.c:254:14: note: Assuming 'clock' is <= field 'max_clk'
if (WARN_ON(clock > host->max_clk))
^
include/asm-generic/bug.h:167:25: note: expanded from macro 'WARN_ON'
int __ret_warn_on = !!(condition); \
^~~~~~~~~
drivers/mmc/host/sdhci-of-aspeed.c:254:2: note: Taking false branch
if (WARN_ON(clock > host->max_clk))
^
drivers/mmc/host/sdhci-of-aspeed.c:273:42: note: Assuming 'div' is >= 256
for (div = sdhci->pdata->clk_div_start; div < 256; div *= 2) {
^~~~~~~~~
drivers/mmc/host/sdhci-of-aspeed.c:273:2: note: Loop condition is false. Execution continues on line 279
for (div = sdhci->pdata->clk_div_start; div < 256; div *= 2) {
^
drivers/mmc/host/sdhci-of-aspeed.c:283:2: note: 2nd function call argument is an uninitialized value
aspeed_sdhci_configure_phase(host, bus);
^ ~~~
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
4 warnings generated.
drivers/mmc/host/dw_mmc.c:1206:24: warning: Access to field 'host' results in a dereference of a null pointer (loaded from variable 'slot') [clang-analyzer-core.NullDereference]
struct dw_mci *host = slot->host;
^
drivers/mmc/host/dw_mmc.c:3536:6: note: Assuming field 'slot' is null
if (host->slot &&
^~~~~~~~~~
drivers/mmc/host/dw_mmc.c:3536:17: note: Left side of '&&' is false
if (host->slot &&
^
drivers/mmc/host/dw_mmc.c:3544:8: note: Calling 'clk_prepare_enable'
ret = clk_prepare_enable(host->ciu_clk);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/clk.h:1073:6: note: Assuming 'ret' is 0
if (ret)
^~~
include/linux/clk.h:1073:2: note: Taking false branch
if (ret)
^
include/linux/clk.h:1076:6: note: Assuming 'ret' is 0
if (ret)
^~~
include/linux/clk.h:1076:2: note: Taking false branch
if (ret)
^
include/linux/clk.h:1079:2: note: Returning zero (loaded from 'ret'), which participates in a condition later
return ret;
^~~~~~~~~~
drivers/mmc/host/dw_mmc.c:3544:8: note: Returning from 'clk_prepare_enable'
ret = clk_prepare_enable(host->ciu_clk);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/mmc/host/dw_mmc.c:3545:6: note: 'ret' is 0
if (ret)
^~~
drivers/mmc/host/dw_mmc.c:3545:2: note: Taking false branch
if (ret)
^
drivers/mmc/host/dw_mmc.c:3548:7: note: Calling 'dw_mci_ctrl_reset'
if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_ALL_RESET_FLAGS)) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/mmc/host/dw_mmc.c:201:6: note: Left side of '&&' is false
if (readl_poll_timeout_atomic(host->regs + SDMMC_CTRL, ctrl,
vim +/clk_wr_delay +517 drivers/mmc/host/sdhci-cadence.c
f5412b4632762b2 Dhananjay Kangude 2023-01-23 498
f5412b4632762b2 Dhananjay Kangude 2023-01-23 499 static void sdhci_cdns_sd6_phy_calc_out(struct sdhci_cdns_sd6_phy *phy,
f5412b4632762b2 Dhananjay Kangude 2023-01-23 500 bool cmd_not_dat)
f5412b4632762b2 Dhananjay Kangude 2023-01-23 501 {
f5412b4632762b2 Dhananjay Kangude 2023-01-23 502 u32 wr0_dly = 0, wr1_dly = 0, output_min, output_max, phy_o_delay,
f5412b4632762b2 Dhananjay Kangude 2023-01-23 503 clk_wr_delay = 0, wr0_sdclk_dly = 0, wr1_sdclk_dly = 0;
f5412b4632762b2 Dhananjay Kangude 2023-01-23 504 bool data_ddr = phy->ddr && !cmd_not_dat;
f5412b4632762b2 Dhananjay Kangude 2023-01-23 505 int t;
f5412b4632762b2 Dhananjay Kangude 2023-01-23 506
f5412b4632762b2 Dhananjay Kangude 2023-01-23 507 if (cmd_not_dat) {
f5412b4632762b2 Dhananjay Kangude 2023-01-23 508 output_min = phy->t.t_cmd_output_min;
f5412b4632762b2 Dhananjay Kangude 2023-01-23 509 output_max = phy->t.t_cmd_output_max;
f5412b4632762b2 Dhananjay Kangude 2023-01-23 510 phy_o_delay = phy->d.phy_cmd_o_delay;
f5412b4632762b2 Dhananjay Kangude 2023-01-23 511 } else {
f5412b4632762b2 Dhananjay Kangude 2023-01-23 512 output_min = phy->t.t_dat_output_min;
f5412b4632762b2 Dhananjay Kangude 2023-01-23 513 output_max = phy->t.t_dat_output_max;
f5412b4632762b2 Dhananjay Kangude 2023-01-23 514 phy_o_delay = phy->d.phy_dat_o_delay;
f5412b4632762b2 Dhananjay Kangude 2023-01-23 515 }
f5412b4632762b2 Dhananjay Kangude 2023-01-23 516
f5412b4632762b2 Dhananjay Kangude 2023-01-23 @517 clk_wr_delay = 0;
f5412b4632762b2 Dhananjay Kangude 2023-01-23 518 if (data_ddr) {
f5412b4632762b2 Dhananjay Kangude 2023-01-23 519 wr0_sdclk_dly = 1;
f5412b4632762b2 Dhananjay Kangude 2023-01-23 520 wr1_sdclk_dly = 1;
f5412b4632762b2 Dhananjay Kangude 2023-01-23 521 }
f5412b4632762b2 Dhananjay Kangude 2023-01-23 522
f5412b4632762b2 Dhananjay Kangude 2023-01-23 523 t = phy_o_delay - phy->d.phy_sdclk_delay - output_min;
f5412b4632762b2 Dhananjay Kangude 2023-01-23 524 if (t < 0 && phy->settings.sdhc_extended_wr_mode == 1) {
f5412b4632762b2 Dhananjay Kangude 2023-01-23 525 u32 n_half_cycle = DIV_ROUND_UP(-t * 2, phy->t_sdmclk);
f5412b4632762b2 Dhananjay Kangude 2023-01-23 526
f5412b4632762b2 Dhananjay Kangude 2023-01-23 527 wr0_dly = (n_half_cycle + 1) / 2;
f5412b4632762b2 Dhananjay Kangude 2023-01-23 528 if (data_ddr)
f5412b4632762b2 Dhananjay Kangude 2023-01-23 529 wr1_dly = (n_half_cycle + 1) / 2;
f5412b4632762b2 Dhananjay Kangude 2023-01-23 530 else
f5412b4632762b2 Dhananjay Kangude 2023-01-23 531 wr1_dly = (n_half_cycle + 1) % 2 + wr0_dly - 1;
f5412b4632762b2 Dhananjay Kangude 2023-01-23 532 }
f5412b4632762b2 Dhananjay Kangude 2023-01-23 533
f5412b4632762b2 Dhananjay Kangude 2023-01-23 534 if (phy->settings.sdhc_extended_wr_mode == 0) {
f5412b4632762b2 Dhananjay Kangude 2023-01-23 535 u32 out_hold, out_setup, out_hold_margin;
f5412b4632762b2 Dhananjay Kangude 2023-01-23 536 u32 n;
f5412b4632762b2 Dhananjay Kangude 2023-01-23 537
f5412b4632762b2 Dhananjay Kangude 2023-01-23 538 if (!data_ddr)
f5412b4632762b2 Dhananjay Kangude 2023-01-23 539 wr0_dly = 1;
f5412b4632762b2 Dhananjay Kangude 2023-01-23 540
f5412b4632762b2 Dhananjay Kangude 2023-01-23 541 out_setup = output_max;
f5412b4632762b2 Dhananjay Kangude 2023-01-23 542 out_hold = output_min;
f5412b4632762b2 Dhananjay Kangude 2023-01-23 543 out_hold_margin = DIV_ROUND_UP(out_setup - out_hold, 4);
f5412b4632762b2 Dhananjay Kangude 2023-01-23 544 out_hold += out_hold_margin;
f5412b4632762b2 Dhananjay Kangude 2023-01-23 545
f5412b4632762b2 Dhananjay Kangude 2023-01-23 546 if (phy->settings.cp_dll_bypass_mode == 0)
f5412b4632762b2 Dhananjay Kangude 2023-01-23 547 n = DIV_ROUND_UP(256 * out_hold, phy->vars.t_sdmclk_calc);
f5412b4632762b2 Dhananjay Kangude 2023-01-23 548 else
f5412b4632762b2 Dhananjay Kangude 2023-01-23 549 n = DIV_ROUND_UP(out_hold, phy->d.delay_element) - 1;
f5412b4632762b2 Dhananjay Kangude 2023-01-23 550
f5412b4632762b2 Dhananjay Kangude 2023-01-23 551 if (n <= phy->vars.dll_max_value)
f5412b4632762b2 Dhananjay Kangude 2023-01-23 552 clk_wr_delay = n;
f5412b4632762b2 Dhananjay Kangude 2023-01-23 553 else
f5412b4632762b2 Dhananjay Kangude 2023-01-23 554 clk_wr_delay = 255;
f5412b4632762b2 Dhananjay Kangude 2023-01-23 555 } else {
f5412b4632762b2 Dhananjay Kangude 2023-01-23 556 /* sdhc_extended_wr_mode = 1 - PHY IO cell work in SDR mode */
f5412b4632762b2 Dhananjay Kangude 2023-01-23 557 clk_wr_delay = 0;
f5412b4632762b2 Dhananjay Kangude 2023-01-23 558 }
f5412b4632762b2 Dhananjay Kangude 2023-01-23 559
f5412b4632762b2 Dhananjay Kangude 2023-01-23 560 if (cmd_not_dat) {
f5412b4632762b2 Dhananjay Kangude 2023-01-23 561 phy->settings.sdhc_wrcmd0_dly = wr0_dly;
f5412b4632762b2 Dhananjay Kangude 2023-01-23 562 phy->settings.sdhc_wrcmd1_dly = wr1_dly;
f5412b4632762b2 Dhananjay Kangude 2023-01-23 563 phy->settings.cp_clk_wrdqs_delay = clk_wr_delay;
f5412b4632762b2 Dhananjay Kangude 2023-01-23 564 phy->settings.sdhc_wrcmd0_sdclk_dly = wr0_sdclk_dly;
f5412b4632762b2 Dhananjay Kangude 2023-01-23 565 phy->settings.sdhc_wrcmd1_sdclk_dly = wr1_sdclk_dly;
f5412b4632762b2 Dhananjay Kangude 2023-01-23 566 } else {
f5412b4632762b2 Dhananjay Kangude 2023-01-23 567 phy->settings.sdhc_wrdata0_dly = wr0_dly;
f5412b4632762b2 Dhananjay Kangude 2023-01-23 568 phy->settings.sdhc_wrdata1_dly = wr1_dly;
f5412b4632762b2 Dhananjay Kangude 2023-01-23 569 phy->settings.cp_clk_wr_delay = clk_wr_delay;
f5412b4632762b2 Dhananjay Kangude 2023-01-23 570 phy->settings.sdhc_wrdata0_sdclk_dly = wr0_sdclk_dly;
f5412b4632762b2 Dhananjay Kangude 2023-01-23 571 phy->settings.sdhc_wrdata1_sdclk_dly = wr1_sdclk_dly;
f5412b4632762b2 Dhananjay Kangude 2023-01-23 572 }
f5412b4632762b2 Dhananjay Kangude 2023-01-23 573 }
f5412b4632762b2 Dhananjay Kangude 2023-01-23 574
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests
next reply other threads:[~2023-02-22 2:26 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-22 2:25 kernel test robot [this message]
-- strict thread matches above, loose matches on Subject: below --
2023-01-23 19:27 [PATCH v2 0/5] drivers: mmc: sdhci-cadence: SD6 controller support Piyush Malgujar
2023-01-23 19:27 ` [PATCH v2 2/5] " Piyush Malgujar
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