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From: Christoph Hellwig <hch@lst.de>
To: Mikhail Gavrilov <mikhail.v.gavrilov@gmail.com>
Cc: Takashi Iwai <tiwai@suse.de>,
	alsa-devel@alsa-project.org, hch@lst.de,
	m.szyprowski@samsung.com,
	Linux List Kernel Mailing <linux-kernel@vger.kernel.org>,
	Robin Murphy <robin.murphy@arm.com>,
	iommu@lists.linux.dev
Subject: Re: [6.2][regression] after commit ffcb754584603adf7039d7972564fbf6febdc542 all sound devices disappeared (due BUG at mm/page_alloc.c:3592!)
Date: Fri, 16 Dec 2022 07:46:45 +0100	[thread overview]
Message-ID: <20221216064645.GA24446@lst.de> (raw)
In-Reply-To: <CABXGCsPnpu0TGHnvXM1we7q1t3tJAOYW2rA=AMvf7ZahcYvpRQ@mail.gmail.com>

Ok, it seems like the sound noncontig alloc code that I already
commented on as potentially bogus GFP_GOMP mapping trips this.  I think
for now the right thing would be to revert the hunk in dma-iommu.c
(see patch below).  The other thing to try would be to remove both
uses GFP_COMP in sound/core/memalloc.c, which should have the same
effect.

diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 9297b741f5e80e..f798c44e090337 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -744,9 +744,6 @@ static struct page **__iommu_dma_alloc_pages(struct device *dev,
 	/* IOMMU can map any pages, so himem can also be used here */
 	gfp |= __GFP_NOWARN | __GFP_HIGHMEM;
 
-	/* It makes no sense to muck about with huge pages */
-	gfp &= ~__GFP_COMP;
-
 	while (count) {
 		struct page *page = NULL;
 		unsigned int order_size;

WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@lst.de>
To: Mikhail Gavrilov <mikhail.v.gavrilov@gmail.com>
Cc: alsa-devel@alsa-project.org, Takashi Iwai <tiwai@suse.de>,
	Linux List Kernel Mailing <linux-kernel@vger.kernel.org>,
	iommu@lists.linux.dev, Robin Murphy <robin.murphy@arm.com>,
	hch@lst.de, m.szyprowski@samsung.com
Subject: Re: [6.2][regression] after commit ffcb754584603adf7039d7972564fbf6febdc542 all sound devices disappeared (due BUG at mm/page_alloc.c:3592!)
Date: Fri, 16 Dec 2022 07:46:45 +0100	[thread overview]
Message-ID: <20221216064645.GA24446@lst.de> (raw)
In-Reply-To: <CABXGCsPnpu0TGHnvXM1we7q1t3tJAOYW2rA=AMvf7ZahcYvpRQ@mail.gmail.com>

Ok, it seems like the sound noncontig alloc code that I already
commented on as potentially bogus GFP_GOMP mapping trips this.  I think
for now the right thing would be to revert the hunk in dma-iommu.c
(see patch below).  The other thing to try would be to remove both
uses GFP_COMP in sound/core/memalloc.c, which should have the same
effect.

diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 9297b741f5e80e..f798c44e090337 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -744,9 +744,6 @@ static struct page **__iommu_dma_alloc_pages(struct device *dev,
 	/* IOMMU can map any pages, so himem can also be used here */
 	gfp |= __GFP_NOWARN | __GFP_HIGHMEM;
 
-	/* It makes no sense to muck about with huge pages */
-	gfp &= ~__GFP_COMP;
-
 	while (count) {
 		struct page *page = NULL;
 		unsigned int order_size;

  parent reply	other threads:[~2022-12-16  6:47 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-12-15 14:17 [6.2][regression] after commit ffcb754584603adf7039d7972564fbf6febdc542 all sound devices disappeared (due BUG at mm/page_alloc.c:3592!) Mikhail Gavrilov
2022-12-15 18:23 ` Kai Vehmanen
2022-12-15 18:23   ` Kai Vehmanen
2022-12-16  0:06 ` Joan Bruguera
2022-12-16  6:46 ` Christoph Hellwig [this message]
2022-12-16  6:46   ` Christoph Hellwig
2022-12-16 11:40   ` Robin Murphy
2022-12-16 11:40     ` Robin Murphy
2022-12-16 12:15     ` Christoph Hellwig
2022-12-16 12:15       ` Christoph Hellwig
2022-12-16 12:52       ` Robin Murphy
2022-12-16 12:52         ` Robin Murphy
2022-12-22 12:17 ` [6.2][regression] after commit ffcb754584603adf7039d7972564fbf6febdc542 all sound devices disappeared (due BUG at mm/page_alloc.c:3592!) #forregzbot Thorsten Leemhuis
2022-12-24  7:20   ` Thorsten Leemhuis
     [not found] <CABXGCsPnpu0TGHnvXM1we7q1t3tJAOYW2rA=>
2022-12-15 23:52 ` [6.2][regression] after commit ffcb754584603adf7039d7972564fbf6febdc542 all sound devices disappeared (due BUG at mm/page_alloc.c:3592!) Joan Bruguera

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