linux-kernel - Re: ioremap and dma cleanups and fixes for superh (2nd resend)

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Message-ID: <2df7ca7f-7e26-c916-b6ac-4ec1913fb8d7@physik.fu-berlin.de>
Date:   Wed, 15 Jul 2020 18:18:27 +0200
From:   John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Rich Felker <dalias@...c.org>, Christoph Hellwig <hch@....de>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Linux-sh list <linux-sh@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: ioremap and dma cleanups and fixes for superh (2nd resend)

On 7/15/20 4:37 PM, John Paul Adrian Glaubitz wrote:
> Okay, kernel 5.0.0 does not suffer from this bug. So I should be able to bisect
> this particular issue.
> 
> I'm glad I don't have to start bisecting with earlier kernels because these
> won't build easily with my current toolchain based on gcc-9.
> 
> Will report once I found the bad commit that introduced the problem.

Found the culprit:

c5b27a889da92f4a969d61df77bd4f79ffce57c9 is the first bad commit
commit c5b27a889da92f4a969d61df77bd4f79ffce57c9
Author: Peter Zijlstra <peterz@...radead.org>
Date:   Tue Sep 4 14:45:04 2018 +0200

    sh/tlb: Convert SH to generic mmu_gather
    
    Generic mmu_gather provides everything SH needs (range tracking and
    cache coherency).
    
    No change in behavior intended.
    
    Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
    Cc: Andrew Morton <akpm@...ux-foundation.org>
    Cc: Andy Lutomirski <luto@...nel.org>
    Cc: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
    Cc: Borislav Petkov <bp@...en8.de>
    Cc: Dave Hansen <dave.hansen@...ux.intel.com>
    Cc: H. Peter Anvin <hpa@...or.com>
    Cc: Linus Torvalds <torvalds@...ux-foundation.org>
    Cc: Nick Piggin <npiggin@...il.com>
    Cc: Peter Zijlstra <peterz@...radead.org>
    Cc: Rich Felker <dalias@...c.org>
    Cc: Rik van Riel <riel@...riel.com>
    Cc: Thomas Gleixner <tglx@...utronix.de>
    Cc: Will Deacon <will.deacon@....com>
    Cc: Yoshinori Sato <ysato@...rs.sourceforge.jp>
    Signed-off-by: Ingo Molnar <mingo@...nel.org>

 arch/sh/include/asm/pgalloc.h |   9 +++
 arch/sh/include/asm/tlb.h     | 130 +-----------------------------------------
 2 files changed, 10 insertions(+), 129 deletions(-)

CC'ing the author (Peter Zijlstra <peterz@...radead.org>).

Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer - glaubitz@...ian.org
`. `'   Freie Universitaet Berlin - glaubitz@...sik.fu-berlin.de
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913