Bug 1091641

Summary:	x86_64 kernel should be built with CONFIG_X86_X32=y
Product:	[Fedora] Fedora	Reporter:	Maciej Żenczykowski <zenczykowski>
Component:	kernel	Assignee:	Kernel Maintainer List <kernel-maint>
Status:	CLOSED DUPLICATE	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	unspecified
Version:	20	CC:	gansalmon, itamar, jonathan, kernel-maint, madhu.chinakonda, mchehab
Target Milestone:	---
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2014-04-27 00:20:38 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Maciej Żenczykowski 2014-04-26 21:02:52 UTC

$ egrep X32 /boot/config-3.13.10-200.fc20.x86_64
# CONFIG_X86_X32 is not set

Could we toggle the above to on?

ie.
diff -Naur config-x86_64-generic_ config-x86_64-generic
--- config-x86_64-generic_	2014-04-26 00:11:33.532338990 -0700
+++ config-x86_64-generic	2014-04-26 00:17:41.300308003 -0700
@@ -1,6 +1,6 @@
 CONFIG_64BIT=y

-# CONFIG_X86_X32 is not set
+CONFIG_X86_X32=y
 # CONFIG_MK8 is not set
 # CONFIG_MPSC is not set
 CONFIG_GENERIC_CPU=y


Luckily f20 binutils already includes the required x32 support.

$ rpm -q --whatprovides `which objdump`
binutils-2.23.88.0.1-13.fc20.x86_64

$ objdump --help | egrep -i elf32-x86-64
objdump: supported targets: elf64-x86-64 elf32-i386 elf32-x86-64 a.out-i386-linux pei-i386 pei-x86-64 elf64-l1om elf64-k1om elf64-little elf64-big elf32-little elf32-big plugin srec symbolsrec verilog tekhex binary ihex

I've verified that the above patch is sufficient to get a kernel built/installed/booted,
and indeed the binutils is sufficient for the kernel to be built with (present in the command line visible in .o.cmd files) -DCONFIG_X86_X32_ABI

ie. this is all that is needed to run statically compiled x32 binaries on f20.

Comment 1 Josh Boyer 2014-04-27 00:20:38 UTC


*** This bug has been marked as a duplicate of bug 854317 ***