* + mm-warn-about-vfree-from-atomic-context.patch added to -mm tree
@ 2016-11-22 6:11 akpm
0 siblings, 0 replies; only message in thread
From: akpm @ 2016-11-22 6:11 UTC (permalink / raw)
To: hch, aryabinin, chris, hpa, joaodias, joelaf, jszhang, mingo,
tglx, mm-commits
The patch titled
Subject: mm: warn about vfree from atomic context
has been added to the -mm tree. Its filename is
mm-warn-about-vfree-from-atomic-context.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-warn-about-vfree-from-atomic-context.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-warn-about-vfree-from-atomic-context.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Christoph Hellwig <hch@lst.de>
Subject: mm: warn about vfree from atomic context
We can't handle vfree itself from atomic context, but callers
can explicitly use vfree_atomic instead, which defers the actual
vfree to a workqueue. Unfortunately in_atomic does not work
on non-preemptible kernels, so we can't just do the right thing
by default.
Link: http://lkml.kernel.org/r/1479474236-4139-8-git-send-email-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Joel Fernandes <joelaf@google.com>
Cc: Jisheng Zhang <jszhang@marvell.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: John Dias <joaodias@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/vmalloc.c | 1 +
1 file changed, 1 insertion(+)
diff -puN mm/vmalloc.c~mm-warn-about-vfree-from-atomic-context mm/vmalloc.c
--- a/mm/vmalloc.c~mm-warn-about-vfree-from-atomic-context
+++ a/mm/vmalloc.c
@@ -1530,6 +1530,7 @@ void vfree_atomic(const void *addr)
void vfree(const void *addr)
{
BUG_ON(in_nmi());
+ WARN_ON_ONCE(in_atomic());
kmemleak_free(addr);
_
Patches currently in -mm which might be from hch@lst.de are
mm-remove-free_unmap_vmap_area_noflush.patch
mm-remove-free_unmap_vmap_area_addr.patch
mm-refactor-__purge_vmap_area_lazy.patch
mm-warn-about-vfree-from-atomic-context.patch
mm-mark-all-calls-into-the-vmalloc-subsystem-as-potentially-sleeping.patch
mm-turn-vmap_purge_lock-into-a-mutex.patch
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2016-11-22 6:11 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2016-11-22 6:11 + mm-warn-about-vfree-from-atomic-context.patch added to -mm tree akpm
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).