linux-kernel - Re: [PATCH] staging: gasket: replace symbolic permissions

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Date:   Fri, 19 Jun 2020 10:32:24 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Rodolfo C Villordo <rodolfovillordo@...il.com>
Cc:     devel@...verdev.osuosl.org, Richard Yeh <rcy@...gle.com>,
        Todd Poynor <toddpoynor@...gle.com>,
        Rob Springer <rspringer@...gle.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: gasket: replace symbolic permissions

On Fri, Jun 19, 2020 at 08:27:14AM +0000, Rodolfo C Villordo wrote:
> On Thu, Jun 18, 2020 at 09:47:50AM +0200, Greg Kroah-Hartman wrote:
> > On Mon, Jun 01, 2020 at 12:52:40AM +0000, Rodolfo C. Villordo wrote:
> > > WARNING: Symbolic permissions 'S_IRUGO' are not preferred. Consider using octal permissions '0444'.
> > > +               .attr = __ATTR(_name, S_IRUGO, _show_function, NULL),          \
> > > warning detected by checkpatch.pl
> > > 
> > > Signed-off-by: Rodolfo C. Villordo <rodolfovillordo@...il.com>
> > > ---
> > >  drivers/staging/gasket/gasket_sysfs.h | 2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > 
> > > diff --git a/drivers/staging/gasket/gasket_sysfs.h b/drivers/staging/gasket/gasket_sysfs.h
> > > index ab5aa351d555..d5e167dfbe76 100644
> > > --- a/drivers/staging/gasket/gasket_sysfs.h
> > > +++ b/drivers/staging/gasket/gasket_sysfs.h
> > > @@ -71,7 +71,7 @@ struct gasket_sysfs_attribute {
> > >  
> > >  #define GASKET_SYSFS_RO(_name, _show_function, _attr_type)                     \
> > >  	{                                                                      \
> > > -		.attr = __ATTR(_name, S_IRUGO, _show_function, NULL),          \
> > > +		.attr = __ATTR(_name, 0444, _show_function, NULL),          \
> > 
> > What about using __ATTR_RO() instead?
> > 
> 
> I'm not sure if __ATTR_RO() is a good match here. The
> GASKET_SYSFS_RO() is invoked with different show functions across the
> code. These functions don't follow the name pattern attr_name_show
> used in __ATTR_RO(). Please correct me if I misunderstood anything.
> 
> ### from include/linux/sysfs.h ###
> #define __ATTR_RO(_name) {                                              \
>         .attr   = { .name = __stringify(_name), .mode = 0444 },         \
>         .show   = _name##_show,                                         \
> }
> ###
> 
> ### macro usage across the driver: ###
> $ grep GASKET_SYSFS_RO drivers/staging/gasket/*
> drivers/staging/gasket/apex_driver.c:   GASKET_SYSFS_RO(node_0_page_table_entries, sysfs_show,
> drivers/staging/gasket/apex_driver.c:   GASKET_SYSFS_RO(node_0_simple_page_table_entries, sysfs_show,
> drivers/staging/gasket/apex_driver.c:   GASKET_SYSFS_RO(node_0_num_mapped_pages, sysfs_show,
> drivers/staging/gasket/gasket_core.c:   GASKET_SYSFS_RO(bar_offsets, gasket_sysfs_data_show, ATTR_BAR_OFFSETS),
> drivers/staging/gasket/gasket_core.c:   GASKET_SYSFS_RO(bar_sizes, gasket_sysfs_data_show, ATTR_BAR_SIZES),
> drivers/staging/gasket/gasket_core.c:   GASKET_SYSFS_RO(driver_version, gasket_sysfs_data_show,
> drivers/staging/gasket/gasket_core.c:   GASKET_SYSFS_RO(framework_version, gasket_sysfs_data_show,
> drivers/staging/gasket/gasket_core.c:   GASKET_SYSFS_RO(device_type, gasket_sysfs_data_show, ATTR_DEVICE_TYPE),
> drivers/staging/gasket/gasket_core.c:   GASKET_SYSFS_RO(revision, gasket_sysfs_data_show,
> drivers/staging/gasket/gasket_core.c:   GASKET_SYSFS_RO(pci_address, gasket_sysfs_data_show, ATTR_PCI_ADDRESS),
> drivers/staging/gasket/gasket_core.c:   GASKET_SYSFS_RO(status, gasket_sysfs_data_show, ATTR_STATUS),
> drivers/staging/gasket/gasket_core.c:   GASKET_SYSFS_RO(is_device_owned, gasket_sysfs_data_show,
> drivers/staging/gasket/gasket_core.c:   GASKET_SYSFS_RO(device_owner, gasket_sysfs_data_show,
> drivers/staging/gasket/gasket_core.c:   GASKET_SYSFS_RO(write_open_count, gasket_sysfs_data_show,
> drivers/staging/gasket/gasket_core.c:   GASKET_SYSFS_RO(reset_count, gasket_sysfs_data_show, ATTR_RESET_COUNT),
> drivers/staging/gasket/gasket_core.c:   GASKET_SYSFS_RO(user_mem_ranges, gasket_sysfs_data_show,
> drivers/staging/gasket/gasket_interrupt.c:      GASKET_SYSFS_RO(interrupt_counts, interrupt_sysfs_show,
> ###

Ugh, you are right, that's a mess.  Your original patch is fine, can you
resend it and say in the changelog why it's not ok to use __ATTR_RO()?

thanks,

greg k-h