lkml.org 
[lkml]   [2011]   [Oct]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[RESEND] [RFC][PATCH X86_32 1/2]: Call do_notify_resume() with interrupts enabled
do_notify_resume() gets called with interrupts disabled on x86_32. This
is different from the x86_64 behavior, where interrupts are enabled at
the time.

Queries on lkml on this issue hasn't yielded any clear answer. Lets make
x86_32 behave the same as x86_64, unless there is a real reason to
maintain status quo.

Please refer https://lkml.org/lkml/2011/9/27/130 for more details

A similar change was suggested in arm
https://lkml.org/lkml/2011/8/25/231

My 32-bit machine works fine (tm) with the patch below

Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
---
arch/x86/kernel/entry_32.S | 4 ++++
1 files changed, 4 insertions(+)
diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S
index f3f6f53..22d0e21 100644
--- a/arch/x86/kernel/entry_32.S
+++ b/arch/x86/kernel/entry_32.S
@@ -625,6 +625,8 @@ work_notifysig: # deal with pending signals and
movl %esp, %eax
jne work_notifysig_v86 # returning to kernel-space or
# vm86-space
+ TRACE_IRQS_ON
+ ENABLE_INTERRUPTS(CLBR_NONE)
xorl %edx, %edx
call do_notify_resume
jmp resume_userspace_sig
@@ -638,6 +640,8 @@ work_notifysig: # deal with pending signals and
#else
movl %esp, %eax
#endif
+ TRACE_IRQS_ON
+ ENABLE_INTERRUPTS(CLBR_NONE)
xorl %edx, %edx
call do_notify_resume
jmp resume_userspace_sig


\
 
 \ /
  Last update: 2011-10-25 16:55    [from the cache]
©2003-2011 Jasper Spaans