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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2017-07-19 14:49:27 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-08-03 16:06:43 +1000 |
| commit | 398a719d34a1b65f9fb1e26f999c197a1446ce48 (patch) | |
| tree | 6959c2739cf0e39c6891426d1de5f9ffe881782c | |
| parent | 870cfe77a91e91cac5937784d73b9d27b6a12296 (diff) | |
| download | linux-stable-398a719d34a1b65f9fb1e26f999c197a1446ce48.tar.gz linux-stable-398a719d34a1b65f9fb1e26f999c197a1446ce48.tar.bz2 linux-stable-398a719d34a1b65f9fb1e26f999c197a1446ce48.zip | |
powerpc/mm: Update bits used to skip hash_page
We test a number of bits from DSISR/SRR1 before deciding
to call hash_page(). If any of these is set, we go directly
to do_page_fault() as the bit indicate a fault that needs
to be handled there (no hashing needed).
This updates the current open-coded masks to use the new
DSISR definitions.
This *does* change the masks actually used in two ways:
- We used to test various bits that were defined as "always 0"
in the architecture and could be repurposed for something
else. From now on, we just ignore such bits.
- We were missing some new bits defined on P9
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
| -rw-r--r-- | arch/powerpc/kernel/exceptions-64s.S | 6 | ||||
| -rw-r--r-- | arch/powerpc/kernel/head_32.S | 2 |
2 files changed, 5 insertions, 3 deletions
diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S index 9029afd1fa2a..775ad0b77830 100644 --- a/arch/powerpc/kernel/exceptions-64s.S +++ b/arch/powerpc/kernel/exceptions-64s.S @@ -1477,8 +1477,10 @@ USE_TEXT_SECTION() */ .balign IFETCH_ALIGN_BYTES do_hash_page: -#ifdef CONFIG_PPC_STD_MMU_64 - andis. r0,r4,0xa450 /* weird error? */ + #ifdef CONFIG_PPC_STD_MMU_64 + lis r0,DSISR_BAD_FAULT_64S@h + ori r0,r0,DSISR_BAD_FAULT_64S@l + and. r0,r4,r0 /* weird error? */ bne- handle_page_fault /* if not, try to insert a HPTE */ CURRENT_THREAD_INFO(r11, r1) lwz r0,TI_PREEMPT(r11) /* If we're in an "NMI" */ diff --git a/arch/powerpc/kernel/head_32.S b/arch/powerpc/kernel/head_32.S index 067b843a63a9..b1aa0119ad20 100644 --- a/arch/powerpc/kernel/head_32.S +++ b/arch/powerpc/kernel/head_32.S @@ -388,7 +388,7 @@ DataAccess: EXCEPTION_PROLOG mfspr r10,SPRN_DSISR stw r10,_DSISR(r11) - andis. r0,r10,0xa470 /* weird error? */ + andis. r0,r10,DSISR_BAD_FAULT_32S@h bne 1f /* if not, try to put a PTE */ mfspr r4,SPRN_DAR /* into the hash table */ rlwinm r3,r10,32-15,21,21 /* DSISR_STORE -> _PAGE_RW */ |