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/mips/kernel/ftrace.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'arch/mips/kernel/ftrace.c') diff --git a/arch/mips/kernel/ftrace.c b/arch/mips/kernel/ftrace.c index 2ea0ec95efe9..4b5e1f2bfbce 100644 --- a/arch/mips/kernel/ftrace.c +++ b/arch/mips/kernel/ftrace.c @@ -86,7 +86,7 @@ static int ftrace_modify_code(unsigned long ip, unsigned int new_code) return -EFAULT; old_fs = get_fs(); - set_fs(get_ds()); + set_fs(KERNEL_DS); flush_icache_range(ip, ip + 8); set_fs(old_fs); @@ -111,7 +111,7 @@ static int ftrace_modify_code_2(unsigned long ip, unsigned int new_code1, ip -= 4; old_fs = get_fs(); - set_fs(get_ds()); + set_fs(KERNEL_DS); flush_icache_range(ip, ip + 8); set_fs(old_fs); @@ -135,7 +135,7 @@ static int ftrace_modify_code_2r(unsigned long ip, unsigned int new_code1, return -EFAULT; old_fs = get_fs(); - set_fs(get_ds()); + set_fs(KERNEL_DS); flush_icache_range(ip, ip + 8); set_fs(old_fs); -- cgit v1.2.3-59-g8ed1b