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From: Christoph Hellwig <hch@lst.de>
To: Linus Torvalds <torvalds@linux-foundation.org>,
	Paul Burton <paul.burton@mips.com>,
	James Hogan <jhogan@kernel.org>,
	Yoshinori Sato <ysato@users.sourceforge.jp>,
	Rich Felker <dalias@libc.org>,
	"David S. Miller" <davem@davemloft.net>
Cc: Nicholas Piggin <npiggin@gmail.com>,
	linux-mips@vger.kernel.org, linux-sh@vger.kernel.org,
	sparclinux@vger.kernel.org, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH 4/6] mm: add a gup_fixup_start_addr hook
Date: Sat, 25 May 2019 15:32:01 +0200	[thread overview]
Message-ID: <20190525133203.25853-5-hch@lst.de> (raw)
In-Reply-To: <20190525133203.25853-1-hch@lst.de>

This will allow sparc64 to override its ADI tags for
get_user_pages and get_user_pages_fast.  I have no idea why this
is not required for plain old get_user_pages, but it keeps the
existing sparc64 behavior.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 mm/gup.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/mm/gup.c b/mm/gup.c
index f173fcbaf1b2..1c21ecfbf38b 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -2117,6 +2117,10 @@ static void gup_pgd_range(unsigned long addr, unsigned long end,
 	} while (pgdp++, addr = next, addr != end);
 }
 
+#ifndef gup_fixup_start_addr
+#define gup_fixup_start_addr(start)	(start)
+#endif
+
 #ifndef gup_fast_permitted
 /*
  * Check if it's allowed to use __get_user_pages_fast() for the range, or
@@ -2145,7 +2149,7 @@ int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
 	unsigned long flags;
 	int nr = 0;
 
-	start &= PAGE_MASK;
+	start = gup_fixup_start_addr(start) & PAGE_MASK;
 	len = (unsigned long) nr_pages << PAGE_SHIFT;
 	end = start + len;
 
@@ -2218,7 +2222,7 @@ int get_user_pages_fast(unsigned long start, int nr_pages,
 	unsigned long addr, len, end;
 	int nr = 0, ret = 0;
 
-	start &= PAGE_MASK;
+	start = gup_fixup_start_addr(start) & PAGE_MASK;
 	addr = start;
 	len = (unsigned long) nr_pages << PAGE_SHIFT;
 	end = start + len;
-- 
2.20.1


  parent reply	other threads:[~2019-05-25 13:32 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-25 13:31 RFC: switch the remaining architectures to use generic GUP Christoph Hellwig
2019-05-25 13:31 ` [PATCH 1/6] MIPS: use the generic get_user_pages_fast code Christoph Hellwig
2019-05-25 13:31 ` [PATCH 2/6] sh: add a missing pud_page definition Christoph Hellwig
2019-05-25 13:32 ` [PATCH 3/6] sh: use the generic get_user_pages_fast code Christoph Hellwig
2019-05-25 13:32 ` Christoph Hellwig [this message]
2019-05-25 17:05   ` [PATCH 4/6] mm: add a gup_fixup_start_addr hook Linus Torvalds
2019-05-28 15:57     ` Khalid Aziz
2019-05-29  7:26       ` Christoph Hellwig
2019-05-29  8:19   ` Catalin Marinas
2019-05-25 13:32 ` [PATCH 5/6] sparc64: use the generic get_user_pages_fast code Christoph Hellwig
2019-05-25 16:55   ` David Miller
2019-05-25 13:32 ` [PATCH 6/6] mm: don't allow non-generic get_user_pages_fast implementations Christoph Hellwig
2019-05-25 17:07 ` RFC: switch the remaining architectures to use generic GUP Linus Torvalds
2019-05-25 17:39   ` Christoph Hellwig

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