From: David Hildenbrand <dahi@linux.vnet.ibm.com>
To: linux-kernel@vger.kernel.org
Cc: mingo@redhat.com, yang.shi@windriver.com, bigeasy@linutronix.de,
benh@kernel.crashing.org, paulus@samba.org,
akpm@linux-foundation.org, heiko.carstens@de.ibm.com,
schwidefsky@de.ibm.com, borntraeger@de.ibm.com, mst@redhat.com,
tglx@linutronix.de, David.Laight@ACULAB.COM, hughd@google.com,
hocko@suse.cz, ralf@linux-mips.org, herbert@gondor.apana.org.au,
linux@arm.linux.org.uk, airlied@linux.ie,
daniel.vetter@intel.com, linux-mm@kvack.org,
linux-arch@vger.kernel.org, peterz@infradead.org,
dahi@linux.vnet.ibm.com
Subject: [PATCH v1 14/15] mips: properly lock access to the fpu
Date: Mon, 11 May 2015 17:52:19 +0200 [thread overview]
Message-ID: <1431359540-32227-15-git-send-email-dahi@linux.vnet.ibm.com> (raw)
In-Reply-To: <1431359540-32227-1-git-send-email-dahi@linux.vnet.ibm.com>
Let's always disable preemption and pagefaults when locking the fpu,
so we can be sure that the owner won't change in between.
This is a preparation for pagefault_disable() not touching preemption
anymore.
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
---
arch/mips/kernel/signal-common.h | 9 ++-------
1 file changed, 2 insertions(+), 7 deletions(-)
diff --git a/arch/mips/kernel/signal-common.h b/arch/mips/kernel/signal-common.h
index 06805e0..0b85f82 100644
--- a/arch/mips/kernel/signal-common.h
+++ b/arch/mips/kernel/signal-common.h
@@ -28,12 +28,7 @@ extern void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs,
extern int fpcsr_pending(unsigned int __user *fpcsr);
/* Make sure we will not lose FPU ownership */
-#ifdef CONFIG_PREEMPT
-#define lock_fpu_owner() preempt_disable()
-#define unlock_fpu_owner() preempt_enable()
-#else
-#define lock_fpu_owner() pagefault_disable()
-#define unlock_fpu_owner() pagefault_enable()
-#endif
+#define lock_fpu_owner() ({ preempt_disable(); pagefault_disable(); })
+#define unlock_fpu_owner() ({ pagefault_enable(); preempt_enable(); })
#endif /* __SIGNAL_COMMON_H */
--
2.1.4
next prev parent reply other threads:[~2015-05-11 15:53 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-11 15:52 [PATCH v1 00/15] decouple pagefault_disable() from preempt_disable() David Hildenbrand
2015-05-11 15:52 ` [PATCH v1 01/15] uaccess: count pagefault_disable() levels in pagefault_disabled David Hildenbrand
2015-05-19 7:18 ` [tip:sched/core] sched/preempt, mm/fault: Count pagefault_disable () " tip-bot for David Hildenbrand
2015-05-11 15:52 ` [PATCH v1 02/15] mm, uaccess: trigger might_sleep() in might_fault() with disabled pagefaults David Hildenbrand
2015-05-19 7:18 ` [tip:sched/core] sched/preempt, mm/fault: Trigger " tip-bot for David Hildenbrand
2015-05-11 15:52 ` [PATCH v1 03/15] uaccess: clarify that uaccess may only sleep if pagefaults are enabled David Hildenbrand
2015-05-19 7:18 ` [tip:sched/core] mm/uaccess, mm/fault: Clarify " tip-bot for David Hildenbrand
2015-05-11 15:52 ` [PATCH v1 04/15] mm: explicitly disable/enable preemption in kmap_atomic_* David Hildenbrand
2015-05-19 7:19 ` [tip:sched/core] sched/preempt, mm/kmap: Explicitly disable/ enable " tip-bot for David Hildenbrand
2015-05-11 15:52 ` [PATCH v1 05/15] mips: kmap_coherent relies on disabled preemption David Hildenbrand
2015-05-19 7:19 ` [tip:sched/core] sched/preempt, mm/kmap, MIPS: Disable preemption in kmap_coherent() explicitly tip-bot for David Hildenbrand
2015-05-11 15:52 ` [PATCH v1 06/15] mm: use pagefault_disable() to check for disabled pagefaults in the handler David Hildenbrand
2015-05-19 7:19 ` [tip:sched/core] mm/fault, arch: Use " tip-bot for David Hildenbrand
2015-05-11 15:52 ` [PATCH v1 07/15] drm/i915: use pagefault_disabled() to check for disabled pagefaults David Hildenbrand
2015-05-19 7:20 ` [tip:sched/core] mm/fault, drm/i915: Use " tip-bot for David Hildenbrand
2015-05-11 15:52 ` [PATCH v1 08/15] futex: UP futex_atomic_op_inuser() relies on disabled preemption David Hildenbrand
2015-05-19 7:20 ` [tip:sched/core] sched/preempt, futex: Disable preemption in UP futex_atomic_op_inuser() explicitly tip-bot for David Hildenbrand
2015-05-11 15:52 ` [PATCH v1 09/15] futex: UP futex_atomic_cmpxchg_inatomic() relies on disabled preemption David Hildenbrand
2015-05-19 7:20 ` [tip:sched/core] sched/preempt, futex: Disable preemption in UP futex_atomic_cmpxchg_inatomic() explicitly tip-bot for David Hildenbrand
2015-05-11 15:52 ` [PATCH v1 10/15] arm/futex: UP futex_atomic_cmpxchg_inatomic() relies on disabled preemption David Hildenbrand
2015-05-19 7:21 ` [tip:sched/core] sched/preempt, arm/futex: Disable preemption in UP futex_atomic_cmpxchg_inatomic() explicitly tip-bot for David Hildenbrand
2015-05-11 15:52 ` [PATCH v1 11/15] arm/futex: UP futex_atomic_op_inuser() relies on disabled preemption David Hildenbrand
2015-05-12 19:00 ` Sebastian Andrzej Siewior
2015-05-13 7:38 ` David Hildenbrand
2015-05-13 8:19 ` Sebastian Andrzej Siewior
2015-05-13 8:55 ` David Hildenbrand
2015-05-19 7:21 ` [tip:sched/core] sched/preempt, arm/futex: Disable preemption in UP futex_atomic_op_inuser() explicitly tip-bot for David Hildenbrand
2015-05-11 15:52 ` [PATCH v1 12/15] futex: clarify that preemption doesn't have to be disabled David Hildenbrand
2015-05-19 7:21 ` [tip:sched/core] sched/preempt, futex: Update comments to " tip-bot for David Hildenbrand
2015-05-11 15:52 ` [PATCH v1 13/15] powerpc: enable_kernel_altivec() requires disabled preemption David Hildenbrand
2015-05-19 7:22 ` [tip:sched/core] sched/preempt, powerpc: Disable preemption in enable_kernel_altivec() explicitly tip-bot for David Hildenbrand
2015-05-11 15:52 ` David Hildenbrand [this message]
2015-05-19 7:22 ` [tip:sched/core] sched/preempt, MIPS: Properly lock access to the FPU tip-bot for David Hildenbrand
2015-05-11 15:52 ` [PATCH v1 15/15] uaccess: decouple preemption from the pagefault logic David Hildenbrand
2015-05-19 7:22 ` [tip:sched/core] sched/preempt, mm/fault: Decouple preemption from the page fault logic tip-bot for David Hildenbrand
2015-05-15 14:23 ` [PATCH v1 00/15] decouple pagefault_disable() from preempt_disable() Thomas Gleixner
2015-05-18 12:46 ` David Hildenbrand
2015-05-18 13:04 ` Peter Zijlstra
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=1431359540-32227-15-git-send-email-dahi@linux.vnet.ibm.com \
--to=dahi@linux.vnet.ibm.com \
--cc=David.Laight@ACULAB.COM \
--cc=airlied@linux.ie \
--cc=akpm@linux-foundation.org \
--cc=benh@kernel.crashing.org \
--cc=bigeasy@linutronix.de \
--cc=borntraeger@de.ibm.com \
--cc=daniel.vetter@intel.com \
--cc=heiko.carstens@de.ibm.com \
--cc=herbert@gondor.apana.org.au \
--cc=hocko@suse.cz \
--cc=hughd@google.com \
--cc=linux-arch@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=linux@arm.linux.org.uk \
--cc=mingo@redhat.com \
--cc=mst@redhat.com \
--cc=paulus@samba.org \
--cc=peterz@infradead.org \
--cc=ralf@linux-mips.org \
--cc=schwidefsky@de.ibm.com \
--cc=tglx@linutronix.de \
--cc=yang.shi@windriver.com \
/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;
as well as URLs for NNTP newsgroup(s).