linux-kernel - [PATCH v4 1/7] mm/dax: Dump start address in fault handler

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Message-ID: <20240807194812.819412-2-peterx@redhat.com>
Date: Wed,  7 Aug 2024 15:48:05 -0400
From: Peter Xu <peterx@...hat.com>
To: linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Cc: "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Oscar Salvador <osalvador@...e.de>,
	Dan Williams <dan.j.williams@...el.com>,
	James Houghton <jthoughton@...gle.com>,
	Matthew Wilcox <willy@...radead.org>,
	Nicholas Piggin <npiggin@...il.com>,
	Rik van Riel <riel@...riel.com>,
	Dave Jiang <dave.jiang@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	x86@...nel.org,
	Ingo Molnar <mingo@...hat.com>,
	Rick P Edgecombe <rick.p.edgecombe@...el.com>,
	"Kirill A . Shutemov" <kirill@...temov.name>,
	peterx@...hat.com,
	linuxppc-dev@...ts.ozlabs.org,
	Mel Gorman <mgorman@...hsingularity.net>,
	Hugh Dickins <hughd@...gle.com>,
	Borislav Petkov <bp@...en8.de>,
	David Hildenbrand <david@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Vlastimil Babka <vbabka@...e.cz>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Huang Ying <ying.huang@...el.com>
Subject: [PATCH v4 1/7] 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.

Acked-by: David Hildenbrand <david@...hat.com>
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 2051e4f73c8a..9c1a729cd77e 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