drivers/clk/qcom/clk-alpha-pll.c | 9 +++------ 1 file changed, 3 insertions(+), 6 deletions(-)
In zonda_pll_adjust_l_val() replace the divide operator with comparison
operator since comparisons are faster than divisions. Also, simplify the
logic and remove the unnecessary 'quotient' local variable.
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/r/202408110724.8pqbpDiD-lkp@intel.com/
Signed-off-by: Satya Priya Kakitapalli <quic_skakitap@quicinc.com>
Reviewed-by: Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org>
---
Changes in V2:
- Simplify the logic and remove unnecessary quotient variable.
- Remove Fixes tag as this is just a simplification.
drivers/clk/qcom/clk-alpha-pll.c | 9 +++------
1 file changed, 3 insertions(+), 6 deletions(-)
diff --git a/drivers/clk/qcom/clk-alpha-pll.c b/drivers/clk/qcom/clk-alpha-pll.c
index 2f620ccb41cb..4ce3347beb39 100644
--- a/drivers/clk/qcom/clk-alpha-pll.c
+++ b/drivers/clk/qcom/clk-alpha-pll.c
@@ -2120,14 +2120,11 @@ static void clk_zonda_pll_disable(struct clk_hw *hw)
static void zonda_pll_adjust_l_val(unsigned long rate, unsigned long prate, u32 *l)
{
- u64 remainder, quotient;
+ u64 remainder;
- quotient = rate;
- remainder = do_div(quotient, prate);
- *l = quotient;
+ remainder = do_div(rate, prate);
- if ((remainder * 2) / prate)
- *l = *l + 1;
+ *l = rate + (u32)(remainder * 2 >= prate);
}
static int clk_zonda_pll_set_rate(struct clk_hw *hw, unsigned long rate,
--
2.25.1Hi Satya,
kernel test robot noticed the following build warnings:
[auto build test WARNING on next-20240814]
[cannot apply to clk/clk-next v6.11-rc3 v6.11-rc2 v6.11-rc1 linus/master v6.11-rc3]
[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/Satya-Priya-Kakitapalli/clk-qcom-clk-alpha-pll-Simplify-the-zonda_pll_adjust_l_val/20240815-001519
base: next-20240814
patch link: https://lore.kernel.org/r/20240814102005.33493-1-quic_skakitap%40quicinc.com
patch subject: [PATCH V2] clk: qcom: clk-alpha-pll: Simplify the zonda_pll_adjust_l_val()
config: hexagon-allyesconfig (https://download.01.org/0day-ci/archive/20240817/202408172049.Mc8dSq0c-lkp@intel.com/config)
compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 26670e7fa4f032a019d23d56c6a02926e854e8af)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240817/202408172049.Mc8dSq0c-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202408172049.Mc8dSq0c-lkp@intel.com/
All warnings (new ones prefixed by >>):
In file included from drivers/clk/qcom/clk-alpha-pll.c:10:
In file included from include/linux/regmap.h:20:
In file included from include/linux/iopoll.h:14:
In file included from include/linux/io.h:14:
In file included from arch/hexagon/include/asm/io.h:328:
include/asm-generic/io.h:548:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
548 | val = __raw_readb(PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:561:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
561 | val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
| ~~~~~~~~~~ ^
include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
37 | #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
| ^
In file included from drivers/clk/qcom/clk-alpha-pll.c:10:
In file included from include/linux/regmap.h:20:
In file included from include/linux/iopoll.h:14:
In file included from include/linux/io.h:14:
In file included from arch/hexagon/include/asm/io.h:328:
include/asm-generic/io.h:574:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
574 | val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
| ~~~~~~~~~~ ^
include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu'
35 | #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
| ^
In file included from drivers/clk/qcom/clk-alpha-pll.c:10:
In file included from include/linux/regmap.h:20:
In file included from include/linux/iopoll.h:14:
In file included from include/linux/io.h:14:
In file included from arch/hexagon/include/asm/io.h:328:
include/asm-generic/io.h:585:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
585 | __raw_writeb(value, PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:595:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
595 | __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:605:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
605 | __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
>> drivers/clk/qcom/clk-alpha-pll.c:2125:14: warning: comparison of distinct pointer types ('typeof ((rate)) *' (aka 'unsigned long *') and 'uint64_t *' (aka 'unsigned long long *')) [-Wcompare-distinct-pointer-types]
2125 | remainder = do_div(rate, prate);
| ^~~~~~~~~~~~~~~~~~~
include/asm-generic/div64.h:222:28: note: expanded from macro 'do_div'
222 | (void)(((typeof((n)) *)0) == ((uint64_t *)0)); \
| ~~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~~
drivers/clk/qcom/clk-alpha-pll.c:2125:14: error: incompatible pointer types passing 'unsigned long *' to parameter of type 'uint64_t *' (aka 'unsigned long long *') [-Werror,-Wincompatible-pointer-types]
2125 | remainder = do_div(rate, prate);
| ^~~~~~~~~~~~~~~~~~~
include/asm-generic/div64.h:238:22: note: expanded from macro 'do_div'
238 | __rem = __div64_32(&(n), __base); \
| ^~~~
include/asm-generic/div64.h:213:38: note: passing argument to parameter 'dividend' here
213 | extern uint32_t __div64_32(uint64_t *dividend, uint32_t divisor);
| ^
>> drivers/clk/qcom/clk-alpha-pll.c:2125:14: warning: shift count >= width of type [-Wshift-count-overflow]
2125 | remainder = do_div(rate, prate);
| ^~~~~~~~~~~~~~~~~~~
include/asm-generic/div64.h:234:25: note: expanded from macro 'do_div'
234 | } else if (likely(((n) >> 32) == 0)) { \
| ^ ~~
include/linux/compiler.h:76:40: note: expanded from macro 'likely'
76 | # define likely(x) __builtin_expect(!!(x), 1)
| ^
8 warnings and 1 error generated.
vim +2125 drivers/clk/qcom/clk-alpha-pll.c
2120
2121 static void zonda_pll_adjust_l_val(unsigned long rate, unsigned long prate, u32 *l)
2122 {
2123 u64 remainder;
2124
> 2125 remainder = do_div(rate, prate);
2126
2127 *l = rate + (u32)(remainder * 2 >= prate);
2128 }
2129
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
Hi Satya,
kernel test robot noticed the following build errors:
[auto build test ERROR on next-20240814]
[cannot apply to clk/clk-next v6.11-rc3 v6.11-rc2 v6.11-rc1 linus/master v6.11-rc3]
[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/Satya-Priya-Kakitapalli/clk-qcom-clk-alpha-pll-Simplify-the-zonda_pll_adjust_l_val/20240815-001519
base: next-20240814
patch link: https://lore.kernel.org/r/20240814102005.33493-1-quic_skakitap%40quicinc.com
patch subject: [PATCH V2] clk: qcom: clk-alpha-pll: Simplify the zonda_pll_adjust_l_val()
config: hexagon-allmodconfig (https://download.01.org/0day-ci/archive/20240817/202408171932.T7RdTd9M-lkp@intel.com/config)
compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 26670e7fa4f032a019d23d56c6a02926e854e8af)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240817/202408171932.T7RdTd9M-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202408171932.T7RdTd9M-lkp@intel.com/
All errors (new ones prefixed by >>):
In file included from drivers/clk/qcom/clk-alpha-pll.c:10:
In file included from include/linux/regmap.h:20:
In file included from include/linux/iopoll.h:14:
In file included from include/linux/io.h:14:
In file included from arch/hexagon/include/asm/io.h:328:
include/asm-generic/io.h:548:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
548 | val = __raw_readb(PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:561:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
561 | val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
| ~~~~~~~~~~ ^
include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
37 | #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
| ^
In file included from drivers/clk/qcom/clk-alpha-pll.c:10:
In file included from include/linux/regmap.h:20:
In file included from include/linux/iopoll.h:14:
In file included from include/linux/io.h:14:
In file included from arch/hexagon/include/asm/io.h:328:
include/asm-generic/io.h:574:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
574 | val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
| ~~~~~~~~~~ ^
include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu'
35 | #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
| ^
In file included from drivers/clk/qcom/clk-alpha-pll.c:10:
In file included from include/linux/regmap.h:20:
In file included from include/linux/iopoll.h:14:
In file included from include/linux/io.h:14:
In file included from arch/hexagon/include/asm/io.h:328:
include/asm-generic/io.h:585:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
585 | __raw_writeb(value, PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:595:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
595 | __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:605:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
605 | __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
drivers/clk/qcom/clk-alpha-pll.c:2125:14: warning: comparison of distinct pointer types ('typeof ((rate)) *' (aka 'unsigned long *') and 'uint64_t *' (aka 'unsigned long long *')) [-Wcompare-distinct-pointer-types]
2125 | remainder = do_div(rate, prate);
| ^~~~~~~~~~~~~~~~~~~
include/asm-generic/div64.h:222:28: note: expanded from macro 'do_div'
222 | (void)(((typeof((n)) *)0) == ((uint64_t *)0)); \
| ~~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~~
>> drivers/clk/qcom/clk-alpha-pll.c:2125:14: error: incompatible pointer types passing 'unsigned long *' to parameter of type 'uint64_t *' (aka 'unsigned long long *') [-Werror,-Wincompatible-pointer-types]
2125 | remainder = do_div(rate, prate);
| ^~~~~~~~~~~~~~~~~~~
include/asm-generic/div64.h:238:22: note: expanded from macro 'do_div'
238 | __rem = __div64_32(&(n), __base); \
| ^~~~
include/asm-generic/div64.h:213:38: note: passing argument to parameter 'dividend' here
213 | extern uint32_t __div64_32(uint64_t *dividend, uint32_t divisor);
| ^
drivers/clk/qcom/clk-alpha-pll.c:2125:14: warning: shift count >= width of type [-Wshift-count-overflow]
2125 | remainder = do_div(rate, prate);
| ^~~~~~~~~~~~~~~~~~~
include/asm-generic/div64.h:234:25: note: expanded from macro 'do_div'
234 | } else if (likely(((n) >> 32) == 0)) { \
| ^ ~~
include/linux/compiler.h:76:40: note: expanded from macro 'likely'
76 | # define likely(x) __builtin_expect(!!(x), 1)
| ^
8 warnings and 1 error generated.
vim +2125 drivers/clk/qcom/clk-alpha-pll.c
2120
2121 static void zonda_pll_adjust_l_val(unsigned long rate, unsigned long prate, u32 *l)
2122 {
2123 u64 remainder;
2124
> 2125 remainder = do_div(rate, prate);
2126
2127 *l = rate + (u32)(remainder * 2 >= prate);
2128 }
2129
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
On Wed, Aug 14, 2024 at 03:50:05PM GMT, Satya Priya Kakitapalli wrote:
> In zonda_pll_adjust_l_val() replace the divide operator with comparison
> operator since comparisons are faster than divisions. Also, simplify the
> logic and remove the unnecessary 'quotient' local variable.
>
> Reported-by: kernel test robot <lkp@intel.com>
> Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
> Closes: https://lore.kernel.org/r/202408110724.8pqbpDiD-lkp@intel.com/
> Signed-off-by: Satya Priya Kakitapalli <quic_skakitap@quicinc.com>
> Reviewed-by: Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org>
> ---
> Changes in V2:
> - Simplify the logic and remove unnecessary quotient variable.
> - Remove Fixes tag as this is just a simplification.
>
> drivers/clk/qcom/clk-alpha-pll.c | 9 +++------
> 1 file changed, 3 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/clk/qcom/clk-alpha-pll.c b/drivers/clk/qcom/clk-alpha-pll.c
> index 2f620ccb41cb..4ce3347beb39 100644
> --- a/drivers/clk/qcom/clk-alpha-pll.c
> +++ b/drivers/clk/qcom/clk-alpha-pll.c
> @@ -2120,14 +2120,11 @@ static void clk_zonda_pll_disable(struct clk_hw *hw)
>
> static void zonda_pll_adjust_l_val(unsigned long rate, unsigned long prate, u32 *l)
> {
> - u64 remainder, quotient;
> + u64 remainder;
>
> - quotient = rate;
> - remainder = do_div(quotient, prate);
> - *l = quotient;
> + remainder = do_div(rate, prate);
This does not compile on arm32 target.
Regards,
Bjorn
>
> - if ((remainder * 2) / prate)
> - *l = *l + 1;
> + *l = rate + (u32)(remainder * 2 >= prate);
> }
>
> static int clk_zonda_pll_set_rate(struct clk_hw *hw, unsigned long rate,
> --
> 2.25.1
>
On 8/16/2024 3:00 AM, Bjorn Andersson wrote:
> On Wed, Aug 14, 2024 at 03:50:05PM GMT, Satya Priya Kakitapalli wrote:
>> In zonda_pll_adjust_l_val() replace the divide operator with comparison
>> operator since comparisons are faster than divisions. Also, simplify the
>> logic and remove the unnecessary 'quotient' local variable.
>>
>> Reported-by: kernel test robot <lkp@intel.com>
>> Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
>> Closes: https://lore.kernel.org/r/202408110724.8pqbpDiD-lkp@intel.com/
>> Signed-off-by: Satya Priya Kakitapalli <quic_skakitap@quicinc.com>
>> Reviewed-by: Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org>
>> ---
>> Changes in V2:
>> - Simplify the logic and remove unnecessary quotient variable.
>> - Remove Fixes tag as this is just a simplification.
>>
>> drivers/clk/qcom/clk-alpha-pll.c | 9 +++------
>> 1 file changed, 3 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/clk/qcom/clk-alpha-pll.c b/drivers/clk/qcom/clk-alpha-pll.c
>> index 2f620ccb41cb..4ce3347beb39 100644
>> --- a/drivers/clk/qcom/clk-alpha-pll.c
>> +++ b/drivers/clk/qcom/clk-alpha-pll.c
>> @@ -2120,14 +2120,11 @@ static void clk_zonda_pll_disable(struct clk_hw *hw)
>>
>> static void zonda_pll_adjust_l_val(unsigned long rate, unsigned long prate, u32 *l)
>> {
>> - u64 remainder, quotient;
>> + u64 remainder;
>>
>> - quotient = rate;
>> - remainder = do_div(quotient, prate);
>> - *l = quotient;
>> + remainder = do_div(rate, prate);
> This does not compile on arm32 target.
Could you please confirm if it is because of the do_div? I see the
do_div() API is used at multiple places in the same driver already.
> Regards,
> Bjorn
>
>>
>> - if ((remainder * 2) / prate)
>> - *l = *l + 1;
>> + *l = rate + (u32)(remainder * 2 >= prate);
>> }
>>
>> static int clk_zonda_pll_set_rate(struct clk_hw *hw, unsigned long rate,
>> --
>> 2.25.1
>>
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