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author | Linus Torvalds <torvalds@linux-foundation.org> | 2018-07-02 12:38:14 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-07-02 12:38:14 -0700 |
commit | 8d2b6f6b4a805ca74174e779bddde9ad075d3d43 (patch) | |
tree | 4b17b221938b7684aaa1f71c2d540971d0975cbd | |
parent | 4e33d7d47943aaa84a5904472cf2f9c6d6b0a6ca (diff) | |
parent | ae15a41a641449f536578b0d9ec0e4ade130deb5 (diff) | |
download | linux-8d2b6f6b4a805ca74174e779bddde9ad075d3d43.tar.bz2 |
Merge tag 'for-linus' of git://github.com/stffrdhrn/linux
Pull OpenRISC fixes from Stafford Horne:
"Two fixes for issues which were breaking OpenRISC boot:
- Fix bug in __pte_free_tlb() exposed in 4.18 by Matthew Wilcox's
page table flag addition.
- Fix issue booting on real hardware if delay slot detection
emulation is disabled"
* tag 'for-linus' of git://github.com/stffrdhrn/linux:
openrisc: entry: Fix delay slot exception detection
openrisc: Call destructor during __pte_free_tlb
-rw-r--r-- | arch/openrisc/include/asm/pgalloc.h | 6 | ||||
-rw-r--r-- | arch/openrisc/kernel/entry.S | 8 | ||||
-rw-r--r-- | arch/openrisc/kernel/head.S | 9 | ||||
-rw-r--r-- | arch/openrisc/kernel/traps.c | 2 |
4 files changed, 13 insertions, 12 deletions
diff --git a/arch/openrisc/include/asm/pgalloc.h b/arch/openrisc/include/asm/pgalloc.h index 3e1a46615120..8999b9226512 100644 --- a/arch/openrisc/include/asm/pgalloc.h +++ b/arch/openrisc/include/asm/pgalloc.h @@ -98,8 +98,12 @@ static inline void pte_free(struct mm_struct *mm, struct page *pte) __free_page(pte); } +#define __pte_free_tlb(tlb, pte, addr) \ +do { \ + pgtable_page_dtor(pte); \ + tlb_remove_page((tlb), (pte)); \ +} while (0) -#define __pte_free_tlb(tlb, pte, addr) tlb_remove_page((tlb), (pte)) #define pmd_pgtable(pmd) pmd_page(pmd) #define check_pgt_cache() do { } while (0) diff --git a/arch/openrisc/kernel/entry.S b/arch/openrisc/kernel/entry.S index 690d55272ba6..0c826ad6e994 100644 --- a/arch/openrisc/kernel/entry.S +++ b/arch/openrisc/kernel/entry.S @@ -277,12 +277,6 @@ EXCEPTION_ENTRY(_data_page_fault_handler) l.addi r3,r1,0 // pt_regs /* r4 set be EXCEPTION_HANDLE */ // effective address of fault - /* - * __PHX__: TODO - * - * all this can be written much simpler. look at - * DTLB miss handler in the CONFIG_GUARD_PROTECTED_CORE part - */ #ifdef CONFIG_OPENRISC_NO_SPR_SR_DSX l.lwz r6,PT_PC(r3) // address of an offending insn l.lwz r6,0(r6) // instruction that caused pf @@ -314,7 +308,7 @@ EXCEPTION_ENTRY(_data_page_fault_handler) #else - l.lwz r6,PT_SR(r3) // SR + l.mfspr r6,r0,SPR_SR // SR l.andi r6,r6,SPR_SR_DSX // check for delay slot exception l.sfne r6,r0 // exception happened in delay slot l.bnf 7f diff --git a/arch/openrisc/kernel/head.S b/arch/openrisc/kernel/head.S index fb02b2a1d6f2..9fc6b60140f0 100644 --- a/arch/openrisc/kernel/head.S +++ b/arch/openrisc/kernel/head.S @@ -210,8 +210,7 @@ * r4 - EEAR exception EA * r10 - current pointing to current_thread_info struct * r12 - syscall 0, since we didn't come from syscall - * r13 - temp it actually contains new SR, not needed anymore - * r31 - handler address of the handler we'll jump to + * r30 - handler address of the handler we'll jump to * * handler has to save remaining registers to the exception * ksp frame *before* tainting them! @@ -244,6 +243,7 @@ /* r1 is KSP, r30 is __pa(KSP) */ ;\ tophys (r30,r1) ;\ l.sw PT_GPR12(r30),r12 ;\ + /* r4 use for tmp before EA */ ;\ l.mfspr r12,r0,SPR_EPCR_BASE ;\ l.sw PT_PC(r30),r12 ;\ l.mfspr r12,r0,SPR_ESR_BASE ;\ @@ -263,7 +263,10 @@ /* r12 == 1 if we come from syscall */ ;\ CLEAR_GPR(r12) ;\ /* ----- turn on MMU ----- */ ;\ - l.ori r30,r0,(EXCEPTION_SR) ;\ + /* Carry DSX into exception SR */ ;\ + l.mfspr r30,r0,SPR_SR ;\ + l.andi r30,r30,SPR_SR_DSX ;\ + l.ori r30,r30,(EXCEPTION_SR) ;\ l.mtspr r0,r30,SPR_ESR_BASE ;\ /* r30: EA address of handler */ ;\ LOAD_SYMBOL_2_GPR(r30,handler) ;\ diff --git a/arch/openrisc/kernel/traps.c b/arch/openrisc/kernel/traps.c index fac246e6f37a..d8981cbb852a 100644 --- a/arch/openrisc/kernel/traps.c +++ b/arch/openrisc/kernel/traps.c @@ -300,7 +300,7 @@ static inline int in_delay_slot(struct pt_regs *regs) return 0; } #else - return regs->sr & SPR_SR_DSX; + return mfspr(SPR_SR) & SPR_SR_DSX; #endif } |