* mmap huge page and MAP_SYNC flag support
[not found] <1295689295.3498770.1531421083778.ref@mail.yahoo.com>
@ 2018-07-12 18:44 ` David Frank
2018-07-12 18:58 ` valdis.kletnieks at vt.edu
0 siblings, 1 reply; 8+ messages in thread
From: David Frank @ 2018-07-12 18:44 UTC (permalink / raw)
To: kernelnewbies
Hi,How do I enable the MAP_SYNC flag in mmap for linux 4.15, my code does not compile with that flag on linux 4.15.0-041500rc7-generic #201801072330
Also, how do I make mmap support map size of 2GB or larger, currently the call to mmap fails with mapsize of 2GB.
thanks,
David
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* mmap huge page and MAP_SYNC flag support
2018-07-12 18:44 ` mmap huge page and MAP_SYNC flag support David Frank
@ 2018-07-12 18:58 ` valdis.kletnieks at vt.edu
2018-07-12 20:10 ` David Frank
2018-07-12 23:03 ` David Frank
0 siblings, 2 replies; 8+ messages in thread
From: valdis.kletnieks at vt.edu @ 2018-07-12 18:58 UTC (permalink / raw)
To: kernelnewbies
On Thu, 12 Jul 2018 18:44:43 -0000, David Frank said:
> Hi,How do I enable the MAP_SYNC flag in mmap for linux 4.15, my code does not
> compile with that flag on linux 4.15.0-041500rc7-generic #201801072330
Get your distro to ship an update to /usr/include/linux (kernel-headers) that
contains the flag. Your kernel supports it, but your toolchain doesn't until
you get an include file that includes the update for MAP_SYNC
> Also, how do I make mmap support map size of 2GB or larger, currently the
> call to mmap fails with mapsize of 2GB.
What error code does it fail with?
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* mmap huge page and MAP_SYNC flag support
2018-07-12 18:58 ` valdis.kletnieks at vt.edu
@ 2018-07-12 20:10 ` David Frank
2018-07-12 20:22 ` valdis.kletnieks at vt.edu
2018-07-12 23:03 ` David Frank
1 sibling, 1 reply; 8+ messages in thread
From: David Frank @ 2018-07-12 20:10 UTC (permalink / raw)
To: kernelnewbies
Thanks Valdis.Looks like the failure is that I can not write to a 2GB buffer (char bf[2GB size]).Where do I get the distro include file?
On Thursday, July 12, 2018, 2:58:49 PM EDT, valdis.kletnieks at vt.edu <valdis.kletnieks@vt.edu> wrote:
On Thu, 12 Jul 2018 18:44:43 -0000, David Frank said:
> Hi,How do I enable the MAP_SYNC flag in mmap for linux 4.15, my code does not
> compile with that flag on linux 4.15.0-041500rc7-generic #201801072330
Get your distro to ship an update to /usr/include/linux? (kernel-headers) that
contains the flag.? Your kernel supports it, but your toolchain doesn't until
you get an include file that includes the update for MAP_SYNC
> Also, how do I make mmap support map size of 2GB or larger, currently the
> call to mmap fails with mapsize of 2GB.
What error code does it fail with?
_______________________________________________
Kernelnewbies mailing list
Kernelnewbies at kernelnewbies.org
https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
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* mmap huge page and MAP_SYNC flag support
2018-07-12 20:10 ` David Frank
@ 2018-07-12 20:22 ` valdis.kletnieks at vt.edu
2018-07-12 20:33 ` David Frank
0 siblings, 1 reply; 8+ messages in thread
From: valdis.kletnieks at vt.edu @ 2018-07-12 20:22 UTC (permalink / raw)
To: kernelnewbies
On Thu, 12 Jul 2018 20:10:36 -0000, David Frank said:
> Thanks Valdis.Looks like the failure is that I can not write to a 2GB buffer
> (char bf[2GB size]).Where do I get the distro include file?
>From the same exact place you got the distro kernel from. (I'm guessing
it's a distro kernel from the -generic in the uname -r). If you built it
yourself from a Linus source git/tarball, 'make headers_install' will do it, but
note that if the rest of the distro install still thinks you have a distro kernel-headers
installed, the package management system may whine....
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* mmap huge page and MAP_SYNC flag support
2018-07-12 20:22 ` valdis.kletnieks at vt.edu
@ 2018-07-12 20:33 ` David Frank
2018-07-12 20:44 ` valdis.kletnieks at vt.edu
0 siblings, 1 reply; 8+ messages in thread
From: David Frank @ 2018-07-12 20:33 UTC (permalink / raw)
To: kernelnewbies
I got it from hereHow To Install Kernel 4.15 RC7 on Ubuntu, Linux Mint, Elementary OS And Other Ubuntu Derivatives | LinuxG.net
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How To Install Kernel 4.15 RC7 on Ubuntu, Linux Mint, Elementary OS And ...
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no headers
On Thursday, July 12, 2018, 4:22:33 PM EDT, <valdis.kletnieks@vt.edu> wrote:
On Thu, 12 Jul 2018 20:10:36 -0000, David Frank said:
>? Thanks Valdis.Looks like the failure is that I can not write to a 2GB buffer
> (char bf[2GB size]).Where do I get the distro include file?
>From the same exact place you got the distro kernel from. (I'm guessing
it's a distro kernel from the -generic in the uname -r).? If you built it
yourself from a Linus source git/tarball, 'make headers_install' will do it, but
note that if the rest of the distro install still thinks you have a distro kernel-headers
installed, the package management system may whine...._______________________________________________
Kernelnewbies mailing list
Kernelnewbies at kernelnewbies.org
https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
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* mmap huge page and MAP_SYNC flag support
2018-07-12 20:33 ` David Frank
@ 2018-07-12 20:44 ` valdis.kletnieks at vt.edu
2018-07-12 21:27 ` David Frank
0 siblings, 1 reply; 8+ messages in thread
From: valdis.kletnieks at vt.edu @ 2018-07-12 20:44 UTC (permalink / raw)
To: kernelnewbies
On Thu, 12 Jul 2018 20:33:32 -0000, David Frank said:
> I got it from hereHow To Install Kernel 4.15 RC7 on Ubuntu, Linux Mint, Elementary OS And Other Ubuntu Derivatives | LinuxG.net
Looks like you got the linux-image-... .deb but didn't do the linux-headers-... .deb(s).
(And I have no idea why they list 2 different linux-headers .deb's. Anybody understand
Ubuntu's mindset enough to explain that? I get paid to deal with RedHat-based stuff...)
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* mmap huge page and MAP_SYNC flag support
2018-07-12 20:44 ` valdis.kletnieks at vt.edu
@ 2018-07-12 21:27 ` David Frank
0 siblings, 0 replies; 8+ messages in thread
From: David Frank @ 2018-07-12 21:27 UTC (permalink / raw)
To: kernelnewbies
By the way, when I havemmap(NULL, MAPSIZE, PROT_WRITE_|PROT_READ, MAP_HUGETLB|MAP_PRIVATE, fd, 0):where MAPSIZE= 2GB,it fails witherror = 22, invalid argument, without MAP_HUGETLB, it was ok.
On Thursday, July 12, 2018, 4:44:35 PM EDT, <valdis.kletnieks@vt.edu> wrote:
On Thu, 12 Jul 2018 20:33:32 -0000, David Frank said:
>? I got it from hereHow To Install Kernel 4.15 RC7 on Ubuntu, Linux Mint, Elementary OS And Other Ubuntu Derivatives | LinuxG.net
Looks like you got the linux-image-... .deb but didn't do the linux-headers-... .deb(s).
(And I have no idea why they list 2 different linux-headers .deb's. Anybody understand
Ubuntu's mindset enough to explain that? I get paid to deal with RedHat-based stuff...)_______________________________________________
Kernelnewbies mailing list
Kernelnewbies at kernelnewbies.org
https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
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* mmap huge page and MAP_SYNC flag support
2018-07-12 18:58 ` valdis.kletnieks at vt.edu
2018-07-12 20:10 ` David Frank
@ 2018-07-12 23:03 ` David Frank
1 sibling, 0 replies; 8+ messages in thread
From: David Frank @ 2018-07-12 23:03 UTC (permalink / raw)
To: kernelnewbies
Tried everything in here:How do I install kernel header files?
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How do I install kernel header files?
i want to write a device driver but not able to find the header file can someone please help me find them?Also i...
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nothing worked.
On Thursday, July 12, 2018, 2:58:49 PM EDT, valdis.kletnieks at vt.edu <valdis.kletnieks@vt.edu> wrote:
On Thu, 12 Jul 2018 18:44:43 -0000, David Frank said:
> Hi,How do I enable the MAP_SYNC flag in mmap for linux 4.15, my code does not
> compile with that flag on linux 4.15.0-041500rc7-generic #201801072330
Get your distro to ship an update to /usr/include/linux? (kernel-headers) that
contains the flag.? Your kernel supports it, but your toolchain doesn't until
you get an include file that includes the update for MAP_SYNC
> Also, how do I make mmap support map size of 2GB or larger, currently the
> call to mmap fails with mapsize of 2GB.
What error code does it fail with?
_______________________________________________
Kernelnewbies mailing list
Kernelnewbies at kernelnewbies.org
https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
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[not found] <1295689295.3498770.1531421083778.ref@mail.yahoo.com>
2018-07-12 18:44 ` mmap huge page and MAP_SYNC flag support David Frank
2018-07-12 18:58 ` valdis.kletnieks at vt.edu
2018-07-12 20:10 ` David Frank
2018-07-12 20:22 ` valdis.kletnieks at vt.edu
2018-07-12 20:33 ` David Frank
2018-07-12 20:44 ` valdis.kletnieks at vt.edu
2018-07-12 21:27 ` David Frank
2018-07-12 23:03 ` David Frank
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