Changes in Makefile

68b9883c - um: Discover host_task_size from envp

Thu, 19 Sep 2024 12:45:09 +0000

um: Discover host_task_size from envpWhen loading the UML binary, the host kernel will place the stack at thehighest possible address. It will then map the program name andenvironment variables onto the start of the stack.As such, an easy way to figure out the host_task_size is to use thehighest pointer to an environment variable as a reference.Ensure that this works by disabling address layout randomization andre-executing UML in case it was enabled.This increases the available TASK_SIZE for 64 bit UML considerably.Signed-off-by: Benjamin Berg Link: https://patch.msgid.link/20240919124511.282088-9-benjamin@sipsolutions.netSigned-off-by: Johannes Berg List of files: /linux-6.15/arch/x86/um/os-Linux/Makefile

1ca14435 - um: Rely on PTRACE_SETREGSET to set FS/GS base registers

Fri, 10 Nov 2023 11:03:46 +0000

um: Rely on PTRACE_SETREGSET to set FS/GS base registersThese registers are saved/restored together with the other generalregisters using ptrace. In arch_set_tls we then just need to set theregister and it will be synced back normally.Most of this logic was introduced in commit f355559cf7845 ("[PATCH] uml:x86_64 thread fixes"). However, at least today we can rely on ptrace torestore the base registers for us. As such, only the part of the patchthat tracks the FS register for use as thread local storage is actuallyneeded.Signed-off-by: Benjamin Berg Signed-off-by: Richard Weinberger List of files: /linux-6.15/arch/x86/um/os-Linux/Makefile

67d7c302 - kbuild: remove --include-dir MAKEFLAG from top Makefile

Sat, 28 Jan 2023 09:24:23 +0000

kbuild: remove --include-dir MAKEFLAG from top MakefileI added $(srctree)/ to some included Makefiles in the following commits: - 3204a7fb98a3 ("kbuild: prefix $(srctree)/ to some included Makefiles") - d82856395505 ("kbuild: do not require sub-make for separate output tree builds")They were a preparation for removing --include-dir flag.I have never thought --include-dir useful. Rather, it _is_ harmful.For example, run the following commands: $ make -s ARCH=x86 mrproper defconfig $ make ARCH=arm O=foo dtbs make[1]: Entering directory '/tmp/linux/foo' HOSTCC scripts/basic/fixdep Error: kernelrelease not valid - run 'make prepare' to update it UPD include/config/kernel.release make[1]: Leaving directory '/tmp/linux/foo'The first command configures the source tree for x86. The next commandtries to build ARM device trees in the separate foo/ directory - thismust stop because the directory foo/ has not been configured yet.However, due to --include-dir=$(abs_srctree), the top Makefile includesthe wrong include/config/auto.conf from the source tree and continuesbuilding. Kbuild traverses the directory tree, but of course it doesnot work correctly. The Error message is also pointless - 'make prepare'does not help at all for fixing the issue.This commit fixes more arch Makefile, and finally removes --include-dirfrom the top Makefile.There are more breakages under drivers/, but I do not volunteer to fixthem all. I just moved --include-dir to drivers/Makefile.With this commit, the second command will stop with a sensible message. $ make -s ARCH=x86 mrproper defconfig $ make ARCH=arm O=foo dtbs make[1]: Entering directory '/tmp/linux/foo' SYNC include/config/auto.conf.cmd *** *** The source tree is not clean, please run 'make ARCH=arm mrproper' *** in /tmp/linux *** make[2]: *** [../Makefile:646: outputmakefile] Error 1 /tmp/linux/Makefile:770: include/config/auto.conf.cmd: No such file or directory make[1]: *** [/tmp/linux/Makefile:793: include/config/auto.conf.cmd] Error 2 make[1]: Leaving directory '/tmp/linux/foo' make: *** [Makefile:226: __sub-make] Error 2Signed-off-by: Masahiro Yamada List of files: /linux-6.15/arch/x86/um/os-Linux/Makefile

5c48b108 - um: take arch/um/sys-x86 to arch/x86/um

Thu, 18 Aug 2011 19:06:39 +0000

um: take arch/um/sys-x86 to arch/x86/umSigned-off-by: Al Viro Signed-off-by: Richard Weinberger List of files: /linux-6.15/arch/x86/um/os-Linux/Makefile