linux-kernel - [PATCH v2 1/8] mm/dax: Dump start address in fault handler

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Message-ID: <20240703212918.2417843-2-peterx@redhat.com>
Date: Wed,  3 Jul 2024 17:29:11 -0400
From: Peter Xu <peterx@...hat.com>
To: linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Cc: Matthew Wilcox <willy@...radead.org>,
	Mel Gorman <mgorman@...hsingularity.net>,
	Dave Jiang <dave.jiang@...el.com>,
	linuxppc-dev@...ts.ozlabs.org,
	Michael Ellerman <mpe@...erman.id.au>,
	Rik van Riel <riel@...riel.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Nicholas Piggin <npiggin@...il.com>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Huang Ying <ying.huang@...el.com>,
	Oscar Salvador <osalvador@...e.de>,
	"Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	x86@...nel.org,
	Ingo Molnar <mingo@...hat.com>,
	"Kirill A . Shutemov" <kirill@...temov.name>,
	Dan Williams <dan.j.williams@...el.com>,
	Borislav Petkov <bp@...en8.de>,
	peterx@...hat.com,
	Hugh Dickins <hughd@...gle.com>,
	Rick P Edgecombe <rick.p.edgecombe@...el.com>
Subject: [PATCH v2 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