[Devel] Re: [PATCH][cr][nit]: eclone() - Remove extra __user and add a comment

[Oren Laadan]

Since I haven't pushed this yet, do you want me to un-pull
this patch then ?

Sukadev Bhattiprolu wrote:
> Oh, well, Albert pointed out we could make all architectures specify
> stack as base and offset so applications won't need #ifdefs. I am
> planning on resending the eclone patchset with that change. So
> the following change is not needed now.
> 
> Sukadev
> 
> Oren Laadan [orenl at cs.columbia.edu] wrote:
> | 
> | Applied in ckpt-v22-dev (will be pushed soon)
> | 
> | Thanks,
> | 
> | Oren.
> | 
> | On 05/03/2010 10:04 PM, Sukadev Bhattiprolu wrote:
> | > 
> | > Sorry, I thought I had sent this minor patch out earlier, but I just
> | > realized I had not.
> | > ---
> | > 
> | > From: Sukadev Bhattiprolu <sukadev at linux.vnet.ibm.com>
> | > Date: Mon, 3 May 2010 11:38:16 -0700
> | > Subject: [PATCH 1/1] eclone(): Remove extra __user and add a comment
> | > 
> | > As pointed out by Russel King, '__user' does not make sense on an integer
> | > type. Remove it. Also add a comment on why we want 'stack_size' to be 0
> | > on x86 and s390.
> | > 
> | > Signed-off-by: Sukadev Bhattiprolu <sukadev at linux.vnet.ibm.com>
> | > ---
> | >  arch/s390/kernel/process.c |    5 ++++-
> | >  arch/x86/kernel/process.c  |    5 ++++-
> | >  2 files changed, 8 insertions(+), 2 deletions(-)
> | > 
> | > diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
> | > index efc7e8a..b00ffad 100644
> | > --- a/arch/s390/kernel/process.c
> | > +++ b/arch/s390/kernel/process.c
> | > @@ -276,7 +276,7 @@ SYSCALL_DEFINE4(eclone, unsigned int, flags_low, struct clone_args __user *,
> | >  	int __user *parent_tid_ptr;
> | >  	int __user *child_tid_ptr;
> | >  	unsigned long flags;
> | > -	unsigned long __user child_stack;
> | > +	unsigned long child_stack;
> | >  	unsigned long stack_size;
> | >  
> | >  	rc = fetch_clone_args_from_user(uca, args_size, &kca);
> | > @@ -288,6 +288,9 @@ SYSCALL_DEFINE4(eclone, unsigned int, flags_low, struct clone_args __user *,
> | >  	child_tid_ptr =  (int __user *) kca.child_tid_ptr;
> | >  
> | >  	stack_size = (unsigned long) kca.child_stack_size;
> | > +	/*
> | > +	 * s390 does not need/use the stack_size. Ensure it is unused.
> | > +	 */
> | >  	if (stack_size)
> | >  		return -EINVAL;
> | >  
> | > diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
> | > index 5abad20..8b1699a 100644
> | > --- a/arch/x86/kernel/process.c
> | > +++ b/arch/x86/kernel/process.c
> | > @@ -268,7 +268,7 @@ sys_eclone(unsigned flags_low, struct clone_args __user *uca,
> | >  	unsigned long flags;
> | >  	int __user *parent_tidp;
> | >  	int __user *child_tidp;
> | > -	unsigned long __user stack;
> | > +	unsigned long stack;
> | >  	unsigned long stack_size;
> | >  
> | >  	rc = fetch_clone_args_from_user(uca, args_size, &kca);
> | > @@ -286,6 +286,9 @@ sys_eclone(unsigned flags_low, struct clone_args __user *uca,
> | >  	parent_tidp = (int *)(unsigned long)kca.parent_tid_ptr;
> | >  	child_tidp = (int *)(unsigned long)kca.child_tid_ptr;
> | >  
> | > +	/*
> | > +	 * x86 does not need/use the stack_size. Ensure it is unused.
> | > +	 */
> | >  	stack_size = (unsigned long)kca.child_stack_size;
> | >  	if (stack_size)
> | >  		return -EINVAL;
> | > 
> | > 
> 
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