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Date:   Fri, 17 Jul 2020 19:39:37 -0300
From:   André Almeida <>
To:     Thomas Gleixner <>,,
Subject: Re: [RESEND PATCH 3/4] futex: Remove unused or redundant includes

On 7/17/20 6:46 PM, Thomas Gleixner wrote:
> André Almeida <> writes:
>> Since 82af7aca ("Removal of FUTEX_FD"), some includes related to file
>> operations aren't needed anymore. More investigation around the includes
>> showed that a lot of includes aren't required for compilation, possible
>> due to redundant includes. Simplify the code by removing unused
>> includes.
>> Signed-off-by: André Almeida <>
>> ---
>> To test this code, I compiled with different configurations (x86_64,
>> i386, with x32 ABI supported enabled/disabled), and ran futex
>> selftests.
> I agree fully with the FD related ones, but are you sure that all of the
> others are included on all architectures magically? x86 is just one
> piece of the puzzle. We'll see ...

I just retested compiling tip/locking/core, and it seems something
changed the last time I wrote the patch. Removing <linux/compat.h> will
indeed break the compilation now, the patch bellow should fix it. Sorry
for the noise.

-- >8 --

Subject: [PATCH 1/1] futex: Add compat include

Commit 38aa3c15b3a4 removed includes that seemed to be unused.
However, removing <linux/compat.h> makes the compilation fail if the
build configuration supports compatibility ABIs. Fix that by
reinserting the include.

Fixes: 38aa3c15b3a4 ("futex: Remove unused or redundant includes")
Signed-off-by: André Almeida <>
 kernel/futex.c | 1 +
 1 file changed, 1 insertion(+)


diff --git a/kernel/futex.c b/kernel/futex.c
index f483bc52dbac..4616d4ad609d 100644

--- a/kernel/futex.c

+++ b/kernel/futex.c

@@ -31,6 +31,7 @@

 31 *  "The futexes are also cursed."
 32 *  "But they come in a choice of three flavours!"
 33 */
+34#include <linux/compat.h>
 35#include <linux/jhash.h>
 36#include <linux/pagemap.h>
 37#include <linux/syscalls.h>


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