On 09/26/2018 04:56 AM, Peter Zijlstra wrote:
> There are generally two cases:
>
> 1) either the platform has an efficient flush_tlb_range() and
> asm-generic/tlb.h doesn't need any overrides at all.
>
> 2) or an architecture lacks an efficient flush_tlb_range() and
> we override tlb_end_vma() and tlb_flush().
>
> Convert all 'simple' architectures to one of these two forms.
>
> alpha: has no range invalidate -> 2
> arc: already used flush_tlb_range() -> 1
> c6x: has no range invalidate -> 2
> h8300: has no mmu
> hexagon: has an efficient flush_tlb_range() -> 1
> (flush_tlb_mm() is in fact a full range invalidate,
> so no need to shoot down everything)
> m68k: has inefficient flush_tlb_range() -> 2
> microblaze: has no flush_tlb_range() -> 2
> mips: has efficient flush_tlb_range() -> 1
> (even though it currently seems to use flush_tlb_mm())
> nds32: already uses flush_tlb_range() -> 1
> nios2: has inefficient flush_tlb_range() -> 2
> (no limit on range iteration)
> openrisc: has inefficient flush_tlb_range() -> 2
> (no limit on range iteration)
> parisc: already uses flush_tlb_range() -> 1
> sparc32: already uses flush_tlb_range() -> 1
> unicore32: has inefficient flush_tlb_range() -> 2
> (no limit on range iteration)
> xtensa: has efficient flush_tlb_range() -> 1
>
> Cc: Richard Henderson <rth@xxxxxxxxxxx>
> Cc: Vineet Gupta <vgupta@xxxxxxxxxxxx>
> Cc: Mark Salter <msalter@xxxxxxxxxx>
> Cc: Richard Kuo <rkuo@xxxxxxxxxxxxxx>
> Cc: Michal Simek <monstr@xxxxxxxxx>
> Cc: Paul Burton <paul.burton@xxxxxxxx>
> Cc: Greentime Hu <green.hu@xxxxxxxxx>
> Cc: Ley Foon Tan <lftan@xxxxxxxxxx>
> Cc: Jonas Bonn <jonas@xxxxxxxxxxxx>
> Cc: Helge Deller <deller@xxxxxx>
> Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
> Cc: Guan Xuetao <gxt@xxxxxxxxxx>
> Cc: Max Filippov <jcmvbkbc@xxxxxxxxx>
> Cc: Will Deacon <will.deacon@xxxxxxx>
> Cc: "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> Cc: Nick Piggin <npiggin@xxxxxxxxx>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
> ---
> arch/alpha/include/asm/tlb.h | 2 --
> arch/arc/include/asm/tlb.h | 23 -----------------------
> arch/c6x/include/asm/tlb.h | 1 +
> arch/h8300/include/asm/tlb.h | 2 --
> arch/hexagon/include/asm/tlb.h | 12 ------------
> arch/m68k/include/asm/tlb.h | 1 -
> arch/microblaze/include/asm/tlb.h | 4 +---
> arch/mips/include/asm/tlb.h | 8 --------
> arch/nds32/include/asm/tlb.h | 10 ----------
> arch/nios2/include/asm/tlb.h | 8 +++++---
> arch/openrisc/include/asm/tlb.h | 6 ++++--
> arch/parisc/include/asm/tlb.h | 13 -------------
> arch/powerpc/include/asm/tlb.h | 1 -
> arch/sparc/include/asm/tlb_32.h | 13 -------------
> arch/unicore32/include/asm/tlb.h | 10 ++++++----
> arch/xtensa/include/asm/tlb.h | 17 -----------------
> 16 files changed, 17 insertions(+), 114 deletions(-)
>
> --- a/arch/alpha/include/asm/tlb.h
> +++ b/arch/alpha/include/asm/tlb.h
> @@ -4,8 +4,6 @@
>
> #define tlb_start_vma(tlb, vma) do { } while (0)
> #define tlb_end_vma(tlb, vma) do { } while (0)
> -#define __tlb_remove_tlb_entry(tlb, pte, addr) do { } while (0)
> -
> #define tlb_flush(tlb) flush_tlb_mm((tlb)->mm)
>
> #include <asm-generic/tlb.h>
> --- a/arch/arc/include/asm/tlb.h
> +++ b/arch/arc/include/asm/tlb.h
> @@ -9,29 +9,6 @@
> #ifndef _ASM_ARC_TLB_H
> #define _ASM_ARC_TLB_H
>
> -#define tlb_flush(tlb) \
> -do { \
> - if (tlb->fullmm) \
> - flush_tlb_mm((tlb)->mm); \
> -} while (0)
> -
> -/*
> - * This pair is called at time of munmap/exit to flush cache and TLB entries
> - * for mappings being torn down.
> - * 1) cache-flush part -implemented via tlb_start_vma( ) for VIPT aliasing D$
> - * 2) tlb-flush part - implemted via tlb_end_vma( ) flushes the TLB range
> - *
> - * Note, read https://urldefense.proofpoint.com/v2/url?u=http-3A__lkml.org_lkml_2004_1_15_6&d=DwIBaQ&c=DPL6_X_6JkXFx7AXWqB0tg&r=c14YS-cH-kdhTOW89KozFhBtBJgs1zXscZojEZQ0THs&m=5jiyvgRek4SKK5DUWDBGufVcuLez5G-jJCh3K-ndHsg&s=7uAzzw_jdAXMfb07B-vGPh3V1vggbTAsB7xL6Kie47A&e=
> - */
> -
> -#define tlb_end_vma(tlb, vma) \
> -do { \
> - if (!tlb->fullmm) \
> - flush_tlb_range(vma, vma->vm_start, vma->vm_end); \
> -} while (0)
> -
> -#define __tlb_remove_tlb_entry(tlb, ptep, address)
> -
> #include <linux/pagemap.h>
> #include <asm-generic/tlb.h>
LGTM per discussion in an earlier thread. However given that for "simpler" arches
the whole series doesn't apply can you please beef up the changelog so I don't go
scratching my head 2 years down the line. It currently describes the hows of
things but not exactly whys: shift_arg_pages missing tlb_start_vma,
move_page_tables look dodgy, yady yadda ?
Thx,
-Vineet
