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Xtensa fixes for v5.12: 

- fix build with separate exception vectors when they are placed too far
   from the rest of the kernel;
 - fix uaccess-related livelock in do_page_fault.
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Merge tag 'xtensa-20210329' of git://github.com/jcmvbkbc/linux-xtensa

Pull xtensa fixes from Max Filippov:

 - fix build with separate exception vectors when they are placed too
   far from the rest of the kernel

 - fix uaccess-related livelock in do_page_fault.

* tag 'xtensa-20210329' of git://github.com/jcmvbkbc/linux-xtensa:
  xtensa: fix uaccess-related livelock in do_page_fault
  xtensa: move coprocessor_flush to the .text section
rM2-mainline
Linus Torvalds 2021-03-29 11:37:43 -07:00
parent a5e13c6df0 7b9acbb6aa
commit 1e43c377a7
2 changed files with 37 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

64
arch/xtensa/kernel/coprocessor.S
View File

@ -99,37 +99,6 @@
LOAD_CP_REGS_TAB(6)
LOAD_CP_REGS_TAB(7)
/*
* coprocessor_flush(struct thread_info*, index)
* a2 a3
*
* Save coprocessor registers for coprocessor 'index'.
* The register values are saved to or loaded from the coprocessor area
* inside the task_info structure.
*
* Note that this function doesn't update the coprocessor_owner information!
*
*/
ENTRY(coprocessor_flush)
/* reserve 4 bytes on stack to save a0 */
abi_entry(4)
s32i a0, a1, 0
movi a0, .Lsave_cp_regs_jump_table
addx8 a3, a3, a0
l32i a4, a3, 4
l32i a3, a3, 0
add a2, a2, a4
beqz a3, 1f
callx0 a3
1: l32i a0, a1, 0
abi_ret(4)
ENDPROC(coprocessor_flush)
/*
* Entry condition:
*
@ -245,6 +214,39 @@ ENTRY(fast_coprocessor)
ENDPROC(fast_coprocessor)
.text
/*
* coprocessor_flush(struct thread_info*, index)
* a2 a3
*
* Save coprocessor registers for coprocessor 'index'.
* The register values are saved to or loaded from the coprocessor area
* inside the task_info structure.
*
* Note that this function doesn't update the coprocessor_owner information!
*
*/
ENTRY(coprocessor_flush)
/* reserve 4 bytes on stack to save a0 */
abi_entry(4)
s32i a0, a1, 0
movi a0, .Lsave_cp_regs_jump_table
addx8 a3, a3, a0
l32i a4, a3, 4
l32i a3, a3, 0
add a2, a2, a4
beqz a3, 1f
callx0 a3
1: l32i a0, a1, 0
abi_ret(4)
ENDPROC(coprocessor_flush)
.data
ENTRY(coprocessor_owner)

5
arch/xtensa/mm/fault.c
View File

@ -112,8 +112,11 @@ good_area:
*/
fault = handle_mm_fault(vma, address, flags, regs);
if (fault_signal_pending(fault, regs))
if (fault_signal_pending(fault, regs)) {
if (!user_mode(regs))
goto bad_page_fault;
return;
}
if (unlikely(fault & VM_FAULT_ERROR)) {
if (fault & VM_FAULT_OOM)