Where is CONFIG_HZ defined? Announcing the arrival of Valued Associate #679: Cesar Manara Planned maintenance scheduled April 17/18, 2019 at 00:00UTC (8:00pm US/Eastern) 2019 Community Moderator Election Results Why I closed the “Why is Kali so hard” questionLinux kernel headers' organizationCompile the Ubuntu “Raring” Kernel with the Intel CompilerHow is the linking mechanism so fast in the kernel system calls?why is “timer_t” defined in “time.h” on Linux but not OS XHow to add a system call in linux kernel 4.xHow does one establish SIGRTMIN at run-time?Anonymous Pipe Kernel Buffer SizeHow to get the actual program name using the PID of that running program?program stack sizeWhere is the default value of write_wakeup_threshold defined?
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Where is CONFIG_HZ defined?
Announcing the arrival of Valued Associate #679: Cesar Manara
Planned maintenance scheduled April 17/18, 2019 at 00:00UTC (8:00pm US/Eastern)
2019 Community Moderator Election Results
Why I closed the “Why is Kali so hard” questionLinux kernel headers' organizationCompile the Ubuntu “Raring” Kernel with the Intel CompilerHow is the linking mechanism so fast in the kernel system calls?why is “timer_t” defined in “time.h” on Linux but not OS XHow to add a system call in linux kernel 4.xHow does one establish SIGRTMIN at run-time?Anonymous Pipe Kernel Buffer SizeHow to get the actual program name using the PID of that running program?program stack sizeWhere is the default value of write_wakeup_threshold defined?
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I'm in the middle of reading the whole Linux 5.0.7 source code, and I've noticed something strange. I'll refer to linux as the parent directory here, correct me if the community uses some other naming convention in the literature.
In the file linux/include/asm-generic/param.h, the value CONFIG_HZ is used. The value is not defined in the previous lines, and the only included file is uapi/asm-generic/param.h. I believe this refers to linux/include/uapi/asm-generic/param.h, again, correct me if I'm wrong.
In that file, no such value as CONFIG_HZ is ever defined. Now, in your average C program, this would cause a bug. We have 3 options here:
- I misunderstood something and
linux/include/asm-generic/param.hactually includes another file where the value IS defined. - This is a bug, and I am a genius for discovering it (least likely option).
- There is some "magic" going on, like some macros that Linux defines before, or some files the kernel includes before including
linux/include/asm-generic/param.hwhere the value is defined, so that whenlinux/include/asm-generic/param.his called the value is already defined. In this case, please point me to what this file is.
If none of these is true, what is the reason why this is a correct C program?
linux linux-kernel
asked Apr 11 at 19:40
memememememememe
62
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memememe is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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I'm in the middle of reading the whole Linux 5.0.7 source code, and I've noticed something strange. I'll refer to linux as the parent directory here, correct me if the community uses some other naming convention in the literature.
In the file linux/include/asm-generic/param.h, the value CONFIG_HZ is used. The value is not defined in the previous lines, and the only included file is uapi/asm-generic/param.h. I believe this refers to linux/include/uapi/asm-generic/param.h, again, correct me if I'm wrong.
In that file, no such value as CONFIG_HZ is ever defined. Now, in your average C program, this would cause a bug. We have 3 options here:
- I misunderstood something and
linux/include/asm-generic/param.hactually includes another file where the value IS defined. - This is a bug, and I am a genius for discovering it (least likely option).
- There is some "magic" going on, like some macros that Linux defines before, or some files the kernel includes before including
linux/include/asm-generic/param.hwhere the value is defined, so that whenlinux/include/asm-generic/param.his called the value is already defined. In this case, please point me to what this file is.
If none of these is true, what is the reason why this is a correct C program?
linux linux-kernel
asked Apr 11 at 19:40
memememememememe
62
New contributor
memememe is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I'm in the middle of reading the whole Linux 5.0.7 source code, and I've noticed something strange. I'll refer to linux as the parent directory here, correct me if the community uses some other naming convention in the literature.
In the file linux/include/asm-generic/param.h, the value CONFIG_HZ is used. The value is not defined in the previous lines, and the only included file is uapi/asm-generic/param.h. I believe this refers to linux/include/uapi/asm-generic/param.h, again, correct me if I'm wrong.
In that file, no such value as CONFIG_HZ is ever defined. Now, in your average C program, this would cause a bug. We have 3 options here:
- I misunderstood something and
linux/include/asm-generic/param.hactually includes another file where the value IS defined. - This is a bug, and I am a genius for discovering it (least likely option).
- There is some "magic" going on, like some macros that Linux defines before, or some files the kernel includes before including
linux/include/asm-generic/param.hwhere the value is defined, so that whenlinux/include/asm-generic/param.his called the value is already defined. In this case, please point me to what this file is.
If none of these is true, what is the reason why this is a correct C program?
linux linux-kernel
asked Apr 11 at 19:40
memememememememe
62
New contributor
memememe is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I'm in the middle of reading the whole Linux 5.0.7 source code, and I've noticed something strange. I'll refer to linux as the parent directory here, correct me if the community uses some other naming convention in the literature.
In the file linux/include/asm-generic/param.h, the value CONFIG_HZ is used. The value is not defined in the previous lines, and the only included file is uapi/asm-generic/param.h. I believe this refers to linux/include/uapi/asm-generic/param.h, again, correct me if I'm wrong.
In that file, no such value as CONFIG_HZ is ever defined. Now, in your average C program, this would cause a bug. We have 3 options here:
- I misunderstood something and
linux/include/asm-generic/param.hactually includes another file where the value IS defined. - This is a bug, and I am a genius for discovering it (least likely option).
- There is some "magic" going on, like some macros that Linux defines before, or some files the kernel includes before including
linux/include/asm-generic/param.hwhere the value is defined, so that whenlinux/include/asm-generic/param.his called the value is already defined. In this case, please point me to what this file is.
If none of these is true, what is the reason why this is a correct C program?
linux linux-kernel
linux linux-kernel
asked Apr 11 at 19:40
memememememememe
62
New contributor
memememe is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Apr 11 at 19:40
memememememememe
62
New contributor
memememe is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Apr 11 at 19:40
memememememememe
62
New contributor
memememe is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Apr 11 at 19:40
memememememememe
62
asked Apr 11 at 19:40
memememememememe
62
62
New contributor
memememe is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
memememe is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
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Check out our Code of Conduct.
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1 Answer
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Like other CONFIG_ values, CONFIG_HZ is a configuration setting; you’ll find it in kernel/Kconfig.hz, along with various arch-specific overrides in other Kconfig files. Its value is determined during the build and stored in a generated configuration file, include/generated/autoconf.h.
answered Apr 11 at 20:17
Stephen KittStephen Kitt
181k25415494
And I supposeinclude/generated/autoconf.his included in the kernel's execution flow beforelinux/include/asm-generic/param.h?
– memememe
Apr 11 at 21:44
add a comment |
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Like other CONFIG_ values, CONFIG_HZ is a configuration setting; you’ll find it in kernel/Kconfig.hz, along with various arch-specific overrides in other Kconfig files. Its value is determined during the build and stored in a generated configuration file, include/generated/autoconf.h.
answered Apr 11 at 20:17
Stephen KittStephen Kitt
181k25415494
And I supposeinclude/generated/autoconf.his included in the kernel's execution flow beforelinux/include/asm-generic/param.h?
– memememe
Apr 11 at 21:44
add a comment |
Like other CONFIG_ values, CONFIG_HZ is a configuration setting; you’ll find it in kernel/Kconfig.hz, along with various arch-specific overrides in other Kconfig files. Its value is determined during the build and stored in a generated configuration file, include/generated/autoconf.h.
answered Apr 11 at 20:17
Stephen KittStephen Kitt
181k25415494
And I supposeinclude/generated/autoconf.his included in the kernel's execution flow beforelinux/include/asm-generic/param.h?
– memememe
Apr 11 at 21:44
add a comment |
Like other CONFIG_ values, CONFIG_HZ is a configuration setting; you’ll find it in kernel/Kconfig.hz, along with various arch-specific overrides in other Kconfig files. Its value is determined during the build and stored in a generated configuration file, include/generated/autoconf.h.
answered Apr 11 at 20:17
Stephen KittStephen Kitt
181k25415494
Like other CONFIG_ values, CONFIG_HZ is a configuration setting; you’ll find it in kernel/Kconfig.hz, along with various arch-specific overrides in other Kconfig files. Its value is determined during the build and stored in a generated configuration file, include/generated/autoconf.h.
answered Apr 11 at 20:17
Stephen KittStephen Kitt
181k25415494
edited Apr 11 at 20:48
answered Apr 11 at 20:17
Stephen KittStephen Kitt
181k25415494
answered Apr 11 at 20:17
Stephen KittStephen Kitt
181k25415494
answered Apr 11 at 20:17
Stephen KittStephen Kitt
181k25415494
181k25415494
And I supposeinclude/generated/autoconf.his included in the kernel's execution flow beforelinux/include/asm-generic/param.h?
– memememe
Apr 11 at 21:44
add a comment |
And I supposeinclude/generated/autoconf.his included in the kernel's execution flow beforelinux/include/asm-generic/param.h?
– memememe
Apr 11 at 21:44
And I suppose
include/generated/autoconf.h is included in the kernel's execution flow before linux/include/asm-generic/param.h?– memememe
Apr 11 at 21:44
And I suppose
include/generated/autoconf.h is included in the kernel's execution flow before linux/include/asm-generic/param.h?– memememe
Apr 11 at 21:44
add a comment |
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