linux-kernel - [PATCH v3 1/8] mm/dax: Dump start address in fault handler

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Message-ID: <20240715192142.3241557-2-peterx@redhat.com>
Date: Mon, 15 Jul 2024 15:21:35 -0400
From: Peter Xu <peterx@...hat.com>
To: linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Cc: Dave Jiang <dave.jiang@...el.com>,
	Rik van Riel <riel@...riel.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	linuxppc-dev@...ts.ozlabs.org,
	Matthew Wilcox <willy@...radead.org>,
	Rick P Edgecombe <rick.p.edgecombe@...el.com>,
	peterx@...hat.com,
	Oscar Salvador <osalvador@...e.de>,
	Mel Gorman <mgorman@...hsingularity.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Borislav Petkov <bp@...en8.de>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Huang Ying <ying.huang@...el.com>,
	"Kirill A . Shutemov" <kirill@...temov.name>,
	"Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Hugh Dickins <hughd@...gle.com>,
	x86@...nel.org,
	Nicholas Piggin <npiggin@...il.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Ingo Molnar <mingo@...hat.com>
Subject: [PATCH v3 1/8] mm/dax: Dump start address in fault handler

Currently the dax fault handler dumps the vma range when dynamic debugging
enabled.  That's mostly not useful.  Dump the (aligned) address instead
with the order info.

Signed-off-by: Peter Xu <peterx@...hat.com>
---
 drivers/dax/device.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/dax/device.c b/drivers/dax/device.c
index eb61598247a9..714174844ca5 100644
--- a/drivers/dax/device.c
+++ b/drivers/dax/device.c
@@ -235,9 +235,9 @@ static vm_fault_t dev_dax_huge_fault(struct vm_fault *vmf, unsigned int order)
 	int id;
 	struct dev_dax *dev_dax = filp->private_data;
 
-	dev_dbg(&dev_dax->dev, "%s: %s (%#lx - %#lx) order:%d\n", current->comm,
-			(vmf->flags & FAULT_FLAG_WRITE) ? "write" : "read",
-			vmf->vma->vm_start, vmf->vma->vm_end, order);
+	dev_dbg(&dev_dax->dev, "%s: op=%s addr=%#lx order=%d\n", current->comm,
+		(vmf->flags & FAULT_FLAG_WRITE) ? "write" : "read",
+		vmf->address & ~((1UL << (order + PAGE_SHIFT)) - 1), order);
 
 	id = dax_read_lock();
 	if (order == 0)
-- 
2.45.0