Unsupported relocation type: R_X86_64_PLT32
Hi all! In my attempt to write my first useful kernel patch, I'm tracking down a possibly kernel regression on my laptop's wireless driver. I'm trying to use git bisect to narrow down the problem and I'm having trouble compiling a Linux kernel 4.14 from Linus tree in my Arch Linux. The error I'm getting is "Unsupported relocation type: R_X86_64_PLT32" I have read about gcc enabling -fPIC by default from gcc-6 so I have tried compiling with gcc-{8,7,5,4.9} with and without "-fno-pic -no-pic" by running make CC="gcc-5 -fno-pic -no-pic" with no luck. I was expecting those R_X86_64_PLT32 relocations not to be generated with this options but there is something I have still not understood. I have been able to compile the kernel after applying greg's stable tree patch [1] (and [2,3] for gcc-8) but the kernel refuses to boot. Any help/comments on either the problem or the followed methodology will be appreciated! Thank you! :D [1] - https://lore.kernel.org/patchwork/patch/892780/ [2] - https://lore.kernel.org/patchwork/patch/868613/ [3] - https://lore.kernel.org/patchwork/patch/934722/
On Sat, Nov 03, 2018 at 01:54:39PM +0100, Aleix Roca Nonell wrote:
Hi all!
In my attempt to write my first useful kernel patch, I'm tracking down a possibly kernel regression on my laptop's wireless driver. I'm trying to use git bisect to narrow down the problem and I'm having trouble compiling a Linux kernel 4.14 from Linus tree in my Arch Linux.
The error I'm getting is "Unsupported relocation type: R_X86_64_PLT32"
I have read about gcc enabling -fPIC by default from gcc-6 so I have tried compiling with gcc-{8,7,5,4.9} with and without "-fno-pic -no-pic" by running
make CC="gcc-5 -fno-pic -no-pic"
with no luck. I was expecting those R_X86_64_PLT32 relocations not to be generated with this options but there is something I have still not understood.
I have been able to compile the kernel after applying greg's stable tree patch [1] (and [2,3] for gcc-8) but the kernel refuses to boot.
Any help/comments on either the problem or the followed methodology will be appreciated!
Thank you! :D
[1] - https://lore.kernel.org/patchwork/patch/892780/ [2] - https://lore.kernel.org/patchwork/patch/868613/ [3] - https://lore.kernel.org/patchwork/patch/934722/
Sorry, I meant "-fno-pie -no-pie" instead of "-fno-pic -no-pic"
(reminder just in case the email was missed!) On Sat, Nov 03, 2018 at 02:16:53PM +0100, Aleix Roca Nonell wrote:
On Sat, Nov 03, 2018 at 01:54:39PM +0100, Aleix Roca Nonell wrote:
Hi all!
In my attempt to write my first useful kernel patch, I'm tracking down a possibly kernel regression on my laptop's wireless driver. I'm trying to use git bisect to narrow down the problem and I'm having trouble compiling a Linux kernel 4.14 from Linus tree in my Arch Linux.
The error I'm getting is "Unsupported relocation type: R_X86_64_PLT32"
I have read about gcc enabling -fPIC by default from gcc-6 so I have tried compiling with gcc-{8,7,5,4.9} with and without "-fno-pic -no-pic" by running
make CC="gcc-5 -fno-pic -no-pic"
with no luck. I was expecting those R_X86_64_PLT32 relocations not to be generated with this options but there is something I have still not understood.
I have been able to compile the kernel after applying greg's stable tree patch [1] (and [2,3] for gcc-8) but the kernel refuses to boot.
Any help/comments on either the problem or the followed methodology will be appreciated!
Thank you! :D
[1] - https://lore.kernel.org/patchwork/patch/892780/ [2] - https://lore.kernel.org/patchwork/patch/868613/ [3] - https://lore.kernel.org/patchwork/patch/934722/
Sorry, I meant "-fno-pie -no-pie" instead of "-fno-pic -no-pic"
Hi Aleix,
(reminder just in case the email was missed!)
When you post queries/bug reports then you should always Cc maintainers and subsystem specific mailing lists. You can can find maintainers and mailings lists by: $ cd /path to your kernel source/ $ ./scripts/get_maintainer.pl /path to your wireless driver file Thanks a lot, Shyam
On Sat, Nov 03, 2018 at 02:16:53PM +0100, Aleix Roca Nonell wrote:
On Sat, Nov 03, 2018 at 01:54:39PM +0100, Aleix Roca Nonell wrote:
Hi all!
In my attempt to write my first useful kernel patch, I'm tracking down a possibly kernel regression on my laptop's wireless driver. I'm trying to use git bisect to narrow down the problem and I'm having trouble compiling a Linux kernel 4.14 from Linus tree in my Arch Linux.
The error I'm getting is "Unsupported relocation type: R_X86_64_PLT32"
I have read about gcc enabling -fPIC by default from gcc-6 so I have tried compiling with gcc-{8,7,5,4.9} with and without "-fno-pic -no-pic" by running
make CC="gcc-5 -fno-pic -no-pic"
with no luck. I was expecting those R_X86_64_PLT32 relocations not to be generated with this options but there is something I have still not understood.
I have been able to compile the kernel after applying greg's stable tree patch [1] (and [2,3] for gcc-8) but the kernel refuses to boot.
Any help/comments on either the problem or the followed methodology will be appreciated!
Thank you! :D
[1] - https://lore.kernel.org/patchwork/patch/892780/ [2] - https://lore.kernel.org/patchwork/patch/868613/ [3] - https://lore.kernel.org/patchwork/patch/934722/
Sorry, I meant "-fno-pie -no-pie" instead of "-fno-pic -no-pic"
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On Wed, Nov 07, 2018 at 04:32:36PM +0530, Shyam Saini wrote:
Hi Aleix,
(reminder just in case the email was missed!)
When you post queries/bug reports then you should always Cc maintainers and subsystem specific mailing lists.
You can can find maintainers and mailings lists by: $ cd /path to your kernel source/ $ ./scripts/get_maintainer.pl /path to your wireless driver file
Hi Shyam, Sorry, I think I have not made myself clear enough. The error that doesn't let me sleep at night,
"Unsupported relocation type: R_X86_64_PLT32"
it is not related at all with my wireless driver. This error pops up when compiling a Linux Kernel 4.14 from Linus tree with gcc-{8,7,5,4.9}. The reason of why I'm compiling a linux kernel 4.14 is to identify a commit which introduced a possible regression in my wireless driver. To provide some more context, I'm adding the full compile report in the following links: Linux 4.14 (+ patches [2,3]) build with gcc-8.2.1 https://drive.google.com/open?id=1tg0iR3dirhW4MhU_3RXcNyvmiJ-j6nBy Linux 4.14 vanilla build with gcc-4.9.4 https://drive.google.com/open?id=1YJIpVc5VA1xpblQQxHSzrWhTArl5lTKQ I have already spent too many hours in this detail, so any hint is welcomed :) Thank you!
[1] - https://lore.kernel.org/patchwork/patch/892780/ [2] - https://lore.kernel.org/patchwork/patch/868613/ [3] - https://lore.kernel.org/patchwork/patch/934722/
participants (2)
-
Aleix Roca Nonell -
Shyam Saini