linux-kernel - Re: [PATCH v4 1/1] mm/highmem: Remove deprecated kmap

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Date:   Fri, 5 Nov 2021 13:49:21 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Ira Weiny <ira.weiny@...el.com>,
        Prathu Baronia <prathubaronia2011@...il.com>,
        linux-kernel@...r.kernel.org, chintan.pandya@...plus.com,
        Prathu Baronia <prathu.baronia@...plus.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Randy Dunlap <rdunlap@...radead.org>
Subject: Re: [PATCH v4 1/1] mm/highmem: Remove deprecated kmap_atomic

On Thu, Feb 11, 2021 at 03:56:25PM -0800, Andrew Morton wrote:
> On Wed, 10 Feb 2021 16:33:07 -0800 Ira Weiny <ira.weiny@...el.com> wrote:
> 
> > > Signed-off-by: Ira Weiny <ira.weiny@...el.com>
> > 
> > This already has my signed off by so I'm not going to 'review'.  With Prathu's
> > testing information I hope this can land.
> > 
> > Andrew did you see this patch?
> 
> I did now ;)
> 
> Tossed onto the post-rc1 pile, thanks,

This patch seems to have slipped through the gaps for a couple of cycles
now?  I found a missed spot in it for CONFIG_HIGHMEM:

diff --git a/mm/highmem.c b/mm/highmem.c
index 471d9779a7f4..82d8c5ab6e8d 100644
--- a/mm/highmem.c
+++ b/mm/highmem.c
@@ -382,7 +382,7 @@ void zero_user_segments(struct page *page, unsigned start1, unsigned end1,
 			unsigned this_end = min_t(unsigned, end1, PAGE_SIZE);
 
 			if (end1 > start1) {
-				kaddr = kmap_atomic(page + i);
+				kaddr = kmap_local(page + i);
 				memset(kaddr + start1, 0, this_end - start1);
 			}
 			end1 -= this_end;
@@ -397,7 +397,7 @@ void zero_user_segments(struct page *page, unsigned start1, unsigned end1,
 
 			if (end2 > start2) {
 				if (!kaddr)
-					kaddr = kmap_atomic(page + i);
+					kaddr = kmap_local(page + i);
 				memset(kaddr + start2, 0, this_end - start2);
 			}
 			end2 -= this_end;
@@ -405,7 +405,7 @@ void zero_user_segments(struct page *page, unsigned start1, unsigned end1,
 		}
 
 		if (kaddr) {
-			kunmap_atomic(kaddr);
+			kunmap_local(kaddr);
 			flush_dcache_page(page + i);
 		}