Techwizz/kernel-fxtec-pro1x
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

microblaze: evict the check for kernel_mode(regs) from do_notify_resume()

Browse source 
Only one caller hasn't done it in assembler - work_pending on !MMU.
Everything else can't reach do_notify_resume() if we are returning
to kernel mode, so move that check to that sole caller and make
do_notify_resume() reachable only when returning to userland.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-04-29 03:35:29 -04:00
parent 4a9d32d377
commit c886a9fc1f
2 changed files with 3 additions and 9 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
arch/microblaze/kernel/entry-nommu.S
View file

@ -482,6 +482,8 @@ ENTRY(ret_from_kernel_thread)
addk r3, r0, r0
work_pending:
lwi r11, r1, PT_MODE
bneid r11, 2f
enable_irq
andi r11, r19, _TIF_NEED_RESCHED
@ -507,6 +509,7 @@ ENTRY(ret_to_user)
no_work_pending:
disable_irq
2:
/* save r31 */
swi r31, r0, PER_CPU(CURRENT_SAVE)
/* save mode indicator */

9
arch/microblaze/kernel/signal.c
View file

@ -343,15 +343,6 @@ static void do_signal(struct pt_regs *regs, int in_syscall)
asmlinkage void do_notify_resume(struct pt_regs *regs, int in_syscall)
{
/*
* We want the common case to go fast, which
* is why we may in certain cases get here from
* kernel mode. Just return without doing anything
* if so.
*/
if (kernel_mode(regs))
return;
if (test_thread_flag(TIF_SIGPENDING))
do_signal(regs, in_syscall);