linux-kernel - [RFC PATCH 2/4] fs: task_mmu: Have the pagewalk avoid positive callback return codes

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Date:   Thu, 10 Oct 2019 15:40:56 +0200
From:   Thomas Hellström (VMware) 
        <thomas_os@...pmail.org>
To:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        torvalds@...ux-foundation.org, kirill@...temov.name
Cc:     Thomas Hellstrom <thellstrom@...are.com>
Subject: [RFC PATCH 2/4] fs: task_mmu: Have the pagewalk avoid positive callback return codes

From: Thomas Hellstrom <thellstrom@...are.com>

The pagewalk code is being reworked to have positive callback return codes
mean "walk control". Avoid using positive return codes: "1" is replaced by
"-ENOBUFS".

Signed-off-by: Thomas Hellstrom <thellstrom@...are.com>
---
 fs/proc/task_mmu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 9442631fd4af..ef11969d9ba1 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -1265,7 +1265,7 @@ struct pagemapread {
 #define PM_SWAP			BIT_ULL(62)
 #define PM_PRESENT		BIT_ULL(63)
 
-#define PM_END_OF_BUFFER    1
+#define PM_END_OF_BUFFER    (-ENOBUFS)
 
 static inline pagemap_entry_t make_pme(u64 frame, u64 flags)
 {
-- 
2.21.0