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/include/asm/uaccess.h | 1 - 1 file changed, 1 deletion(-) (limited to 'arch/arm/include') diff --git a/arch/arm/include/asm/uaccess.h b/arch/arm/include/asm/uaccess.h index 42aa4a22803c..ae5a0df5316e 100644 --- a/arch/arm/include/asm/uaccess.h +++ b/arch/arm/include/asm/uaccess.h @@ -59,7 +59,6 @@ extern int __put_user_bad(void); * Note that this is actually 0x1,0000,0000 */ #define KERNEL_DS 0x00000000 -#define get_ds() (KERNEL_DS) #ifdef CONFIG_MMU -- cgit v1.2.3