linux-kernel - Re: [PATCH v5 04/18] sparc32: mm: Reduce allocation size for PMD and PTE tables

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Date:   Mon, 18 May 2020 22:15:11 +0300
From:   Mike Rapoport <rppt@...nel.org>
To:     Guenter Roeck <linux@...ck-us.net>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Ira Weiny <ira.weiny@...el.com>, Will Deacon <will@...nel.org>,
        linux-kernel@...r.kernel.org, elver@...gle.com, tglx@...utronix.de,
        paulmck@...nel.org, mingo@...nel.org, peterz@...radead.org,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH v5 04/18] sparc32: mm: Reduce allocation size for PMD and
 PTE tables

On Mon, May 18, 2020 at 11:09:46AM -0700, Guenter Roeck wrote:
> On 5/18/20 7:23 AM, Mike Rapoport wrote:
> 
> Below is another set of bisect results, from next-20200518. It points to one
> of your commits. This is for microblaze (big endian) boot failures.

The microblaze one was easy, as for sparc32 I still have no clue for the
root cause :(

Andrew, can you please fold it into "mm: pgtable: add shortcuts for
accessing kernel PMD and PTE"? 

>From 167250de28aa526342641b2647294a755d234090 Mon Sep 17 00:00:00 2001
From: Mike Rapoport <rppt@...ux.ibm.com>
Date: Mon, 18 May 2020 22:08:10 +0300
Subject: [PATCH] microblaze: fix page table traversal in setup_rt_frame()

The replacement of long folded page table traversal with the direct access
to PMD entry wrongly used the kernel page table in setup_rt_frame()
function instead of the process (current->mm) page table.

Fix it.

Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>
---
 arch/microblaze/kernel/signal.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/microblaze/kernel/signal.c b/arch/microblaze/kernel/signal.c
index 28b1ec4b4e79..bdd6d0c86e16 100644
--- a/arch/microblaze/kernel/signal.c
+++ b/arch/microblaze/kernel/signal.c
@@ -194,7 +194,7 @@ static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
 
 	address = ((unsigned long)frame->tramp);
 #ifdef CONFIG_MMU
-	pmdp = pmd_off_k(address);
+	pmdp = pmd_off(current->mm, address);
 
 	preempt_disable();
 	ptep = pte_offset_map(pmdp, address);
-- 
2.26.2


> Guenter
> 
> ---

-- 
Sincerely yours,
Mike.