Kexec Archive on lore.kernel.org
 help / color / mirror / Atom feed
From: Palmer Dabbelt <palmer@dabbelt.com>
To: arnd@arndb.de, dhowells@redhat.com
Cc: dave@sr71.net, linux-xtensa@linux-xtensa.org, jcmvbkbc@gmail.com,
	hpa@zytor.com, mingo@kernel.org, ast@plumgrid.com,
	aarcange@redhat.com, bhe@redhat.com, x86@kernel.org,
	tomi.valkeinen@ti.com, 3chas3@gmail.com,
	paulmck@linux.vnet.ibm.com, plagnioj@jcrosoft.com,
	vgoyal@redhat.com, aishchuk@linux.vnet.ibm.com,
	linux-arch@vger.kernel.org, a.p.zijlstra@chello.nl,
	jikos@kernel.org, josh@joshtriplett.org, acme@kernel.org,
	mathieu.desnoyers@efficios.com, viro@zeniv.linux.org.uk,
	luto@kernel.org, tglx@linutronix.de, drysdale@google.com,
	chris@zankel.net, iulia.manda21@gmail.com, geoff@infradead.org,
	gregkh@linuxfoundation.org, dyoung@redhat.com,
	kexec@lists.infradead.org, linux-kernel@vger.kernel.org,
	Palmer Dabbelt <palmer@dabbelt.com>,
	ebiederm@xmission.com, linux-api@vger.kernel.org,
	linux-fsdevel@vger.kernel.org, akpm@linux-foundation.org,
	davem@davemloft.net
Subject: [PATCH 04/13] Always expose MAP_UNINITIALIZED to userspace
Date: Tue,  3 Nov 2015 11:46:25 -0800	[thread overview]
Message-ID: <1446579994-9937-5-git-send-email-palmer@dabbelt.com> (raw)
In-Reply-To: <1446579994-9937-1-git-send-email-palmer@dabbelt.com>

This used to be hidden behind CONFIG_MMAP_ALLOW_UNINITIALIZED, so
userspace wouldn't actually ever see it be non-zero.  While I had
originally hoped to avoid hiding it, it looks like this conflicts with
MAP_HUGE_SHIFT so I think it's safer to just keep this 0.

Architectures that want to define this can still override it.  In
fact, the Xtensa port already overrides it in a very similar manner to
the previously broken one (but due to lots of conflicting opinions on
how to solve this correctly, I'm just taking the easy way out and
letting their arch maintainers deal with it -- sorry).

Signed-off-by: Palmer Dabbelt <palmer@dabbelt.com>
Reviewed-by: Andrew Waterman <waterman@eecs.berkeley.edu>
Reviewed-by: Albert Ou <aou@eecs.berkeley.edu>
---
 include/uapi/asm-generic/mman-common.h | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/include/uapi/asm-generic/mman-common.h b/include/uapi/asm-generic/mman-common.h
index ddc3b36..0ce2a13 100644
--- a/include/uapi/asm-generic/mman-common.h
+++ b/include/uapi/asm-generic/mman-common.h
@@ -19,9 +19,7 @@
 #define MAP_TYPE	0x0f		/* Mask for type of mapping */
 #define MAP_FIXED	0x10		/* Interpret addr exactly */
 #define MAP_ANONYMOUS	0x20		/* don't use a file */
-#ifdef CONFIG_MMAP_ALLOW_UNINITIALIZED
-# define MAP_UNINITIALIZED 0x4000000	/* For anonymous mmap, memory could be uninitialized */
-#else
+#ifndef MAP_UNINITIALIZED
 # define MAP_UNINITIALIZED 0x0		/* Don't support this flag */
 #endif
 
-- 
2.4.10


_______________________________________________
kexec mailing list
kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec

  parent reply	other threads:[~2015-11-03 19:47 UTC|newest]

Thread overview: 53+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <1441832902-28993-1-git-send-email-palmer@dabbelt.com>
2015-09-14 22:50 ` [PATCH v3] Remove #ifdef CONFIG_* from all userspace headers Palmer Dabbelt
2015-09-14 22:50   ` [PATCH 01/13] Remove #ifdef CONFIG_64BIT from all asm-generic/fcntl.h Palmer Dabbelt
2015-09-14 22:50   ` [PATCH 02/13] Use sys_ni.c instead of #ifdef to disable fork on CONFIG_NOMMU Palmer Dabbelt
2015-09-14 22:50   ` [PATCH 03/13] Move COMPAT_ATM_ADDPARTY to net/atm/svc.c Palmer Dabbelt
2015-09-17  9:57     ` David Howells
2015-09-17 20:53       ` Palmer Dabbelt
2015-09-14 22:50   ` [PATCH 04/13] Always expose MAP_UNINITIALIZED to userspace Palmer Dabbelt
2015-09-15  0:23     ` Kirill A. Shutemov
2015-09-15  0:52       ` Palmer Dabbelt
2015-09-15  5:19       ` Josh Triplett
2015-09-15  9:42         ` Kirill A. Shutemov
2015-09-15 14:07           ` Josh Triplett
2015-09-17 10:13             ` David Howells
2015-09-14 22:50   ` [PATCH 05/13] Split FDPIC "struct elf_prstatus" to "struct elf_fdpic_prstatus" Palmer Dabbelt
2015-09-17 10:17     ` David Howells
2015-09-14 22:50   ` [PATCH 06/13] Move ep_take_care_of_epollwakeup() to fs/eventpoll.c Palmer Dabbelt
2015-09-14 22:50   ` [PATCH 07/13] Make FB_BACKLIGHT_{LEVELS,MAX} always visible Palmer Dabbelt
2015-09-14 22:50   ` [PATCH 08/13] Move MAX_SHARED_LIBS to fs/binfmt_flat.c Palmer Dabbelt
2015-09-14 22:50   ` [PATCH 09/13] Move bp_type_idx to kernel/event/hw_breakpoint.c Palmer Dabbelt
2015-09-15  8:06     ` Peter Zijlstra
2015-09-15 18:40       ` Palmer Dabbelt
2015-09-15 19:39         ` Peter Zijlstra
2015-09-17  3:56           ` Palmer Dabbelt
     [not found]       ` <2023922.x7a6gQp0x7@wuerfel>
2015-09-17 10:28         ` David Howells
2015-09-24 12:15         ` Frederic Weisbecker
2015-09-14 22:50   ` [PATCH 10/13] Move USE_WCACHING to drivers/block/pktcdvd.c Palmer Dabbelt
2015-09-14 22:50   ` [PATCH 11/13] Always define MAX_RAW_MINORS as 65535 in userspace Palmer Dabbelt
2015-09-15 20:42     ` H. Peter Anvin
2015-09-17  3:08       ` Palmer Dabbelt
2015-09-14 22:50   ` [PATCH 12/13] Remove AT_VECTOR_SIZE_ARCH on x86 Palmer Dabbelt
2015-09-14 22:50   ` [PATCH 13/13] Re-enable and clean up "check_config()" in headers_check.pl Palmer Dabbelt
2015-11-03 19:46   ` [PATCH v4] Remove #ifdef CONFIG_* from all userspace headers Palmer Dabbelt
2015-11-03 19:46     ` [PATCH 01/13] Remove #ifdef CONFIG_64BIT from all asm-generic/fcntl.h Palmer Dabbelt
2015-11-03 19:46     ` [PATCH 02/13] Use sys_ni.c instead of #ifdef to disable fork on CONFIG_NOMMU Palmer Dabbelt
2015-11-03 19:46     ` [PATCH 03/13] Move COMPAT_ATM_ADDPARTY to net/atm/svc.c Palmer Dabbelt
2015-11-03 19:46     ` Palmer Dabbelt [this message]
2015-11-03 19:46     ` [PATCH 05/13] Split FDPIC "struct elf_prstatus" to "struct elf_fdpic_prstatus" Palmer Dabbelt
2015-11-03 19:46     ` [PATCH 06/13] Move ep_take_care_of_epollwakeup() to fs/eventpoll.c Palmer Dabbelt
2015-11-03 19:46     ` [PATCH 07/13] Make FB_BACKLIGHT_{LEVELS,MAX} always visible Palmer Dabbelt
2015-11-03 19:46     ` [PATCH 08/13] Move MAX_SHARED_LIBS to fs/binfmt_flat.c Palmer Dabbelt
2015-11-03 19:46     ` [PATCH 09/13] Move bp_type_idx to kernel/event/hw_breakpoint.c Palmer Dabbelt
2015-11-03 21:28       ` kbuild test robot
2015-11-03 21:29       ` kbuild test robot
2015-11-04 11:41       ` Peter Zijlstra
2015-11-04 12:21         ` Peter Zijlstra
2015-11-07  6:44           ` Palmer Dabbelt
2015-11-03 19:46     ` [PATCH 10/13] Move USE_WCACHING to drivers/block/pktcdvd.c Palmer Dabbelt
2015-11-03 19:46     ` [PATCH 11/13] Always define MAX_RAW_MINORS as 2**20 in userspace Palmer Dabbelt
2015-11-03 20:11       ` kbuild test robot
2015-11-03 19:46     ` [PATCH 12/13] Remove AT_VECTOR_SIZE_ARCH on x86 Palmer Dabbelt
2015-11-03 19:46     ` [PATCH 13/13] Re-enable and clean up "check_config()" in headers_check.pl Palmer Dabbelt
2015-11-03 20:25       ` kbuild test robot
2015-11-03 20:26       ` kbuild test robot

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1446579994-9937-5-git-send-email-palmer@dabbelt.com \
    --to=palmer@dabbelt.com \
    --cc=3chas3@gmail.com \
    --cc=a.p.zijlstra@chello.nl \
    --cc=aarcange@redhat.com \
    --cc=acme@kernel.org \
    --cc=aishchuk@linux.vnet.ibm.com \
    --cc=akpm@linux-foundation.org \
    --cc=arnd@arndb.de \
    --cc=ast@plumgrid.com \
    --cc=bhe@redhat.com \
    --cc=chris@zankel.net \
    --cc=dave@sr71.net \
    --cc=davem@davemloft.net \
    --cc=dhowells@redhat.com \
    --cc=drysdale@google.com \
    --cc=dyoung@redhat.com \
    --cc=ebiederm@xmission.com \
    --cc=geoff@infradead.org \
    --cc=gregkh@linuxfoundation.org \
    --cc=hpa@zytor.com \
    --cc=iulia.manda21@gmail.com \
    --cc=jcmvbkbc@gmail.com \
    --cc=jikos@kernel.org \
    --cc=josh@joshtriplett.org \
    --cc=kexec@lists.infradead.org \
    --cc=linux-api@vger.kernel.org \
    --cc=linux-arch@vger.kernel.org \
    --cc=linux-fsdevel@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-xtensa@linux-xtensa.org \
    --cc=luto@kernel.org \
    --cc=mathieu.desnoyers@efficios.com \
    --cc=mingo@kernel.org \
    --cc=paulmck@linux.vnet.ibm.com \
    --cc=plagnioj@jcrosoft.com \
    --cc=tglx@linutronix.de \
    --cc=tomi.valkeinen@ti.com \
    --cc=vgoyal@redhat.com \
    --cc=viro@zeniv.linux.org.uk \
    --cc=x86@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox