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authorLinus Torvalds <torvalds@linux-foundation.org>2019-03-04 21:39:05 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2019-03-04 21:50:14 +0300
commit736706bee3298208343a76096370e4f6a5c55915 (patch)
tree3e90fd9d540cb15ac671182d52f9a4ade8657c59 /arch/arm/include/asm/uaccess.h
parent84c4e1f89fefe70554da0ab33be72c9be7994379 (diff)
downloadlinux-736706bee3298208343a76096370e4f6a5c55915.tar.xz
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 <jannh@google.com> Inspired-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/arm/include/asm/uaccess.h')
-rw-r--r--arch/arm/include/asm/uaccess.h1
1 files changed, 0 insertions, 1 deletions
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