From 736706bee3298208343a76096370e4f6a5c55915 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Mon, 4 Mar 2019 10:39:05 -0800 Subject: get rid of legacy 'get_ds()' function Every in-kernel use of this function defined it to KERNEL_DS (either as an actual define, or as an inline function). It's an entirely historical artifact, and long long long ago used to actually read the segment selector valueof '%ds' on x86. Which in the kernel is always KERNEL_DS. Inspired by a patch from Jann Horn that just did this for a very small subset of users (the ones in fs/), along with Al who suggested a script. I then just took it to the logical extreme and removed all the remaining gunk. Roughly scripted with git grep -l '(get_ds())' -- :^tools/ | xargs sed -i 's/(get_ds())/(KERNEL_DS)/' git grep -lw 'get_ds' -- :^tools/ | xargs sed -i '/^#define get_ds()/d' plus manual fixups to remove a few unusual usage patterns, the couple of inline function cases and to fix up a comment that had become stale. The 'get_ds()' function remains in an x86 kvm selftest, since in user space it actually does something relevant. Inspired-by: Jann Horn Inspired-by: Al Viro Signed-off-by: Linus Torvalds --- arch/arm/xen/hypercall.S | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) (limited to 'arch/arm/xen/hypercall.S') diff --git a/arch/arm/xen/hypercall.S b/arch/arm/xen/hypercall.S index b0b80c0f09f3..b11bba542fac 100644 --- a/arch/arm/xen/hypercall.S +++ b/arch/arm/xen/hypercall.S @@ -113,8 +113,7 @@ ENTRY(privcmd_call) /* * Disable userspace access from kernel. This is fine to do it - * unconditionally as no set_fs(KERNEL_DS)/set_fs(get_ds()) is - * called before. + * unconditionally as no set_fs(KERNEL_DS) is called before. */ uaccess_disable r4 -- cgit v1.2.3-59-g8ed1b