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authorLinus Torvalds <torvalds@linux-foundation.org>2019-03-04 19:39:05 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2019-03-04 19:50:14 +0100
commit736706bee3298208343a76096370e4f6a5c55915 (patch)
tree3e90fd9d540cb15ac671182d52f9a4ade8657c59 /arch/mips/include/asm/uaccess.h
parentaio: simplify - and fix - fget/fput for io_submit() (diff)
downloadlinux-736706bee3298208343a76096370e4f6a5c55915.tar.xz
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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/mips/include/asm/uaccess.h')
-rw-r--r--arch/mips/include/asm/uaccess.h1
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/mips/include/asm/uaccess.h b/arch/mips/include/asm/uaccess.h
index d43c1dc6ef15..62b298c50905 100644
--- a/arch/mips/include/asm/uaccess.h
+++ b/arch/mips/include/asm/uaccess.h
@@ -69,7 +69,6 @@ extern u64 __ua_limit;
#define USER_DS ((mm_segment_t) { __UA_LIMIT })
#endif
-#define get_ds() (KERNEL_DS)
#define get_fs() (current_thread_info()->addr_limit)
#define set_fs(x) (current_thread_info()->addr_limit = (x))