Re: [PATCH v3 2/2] mm: shmem: refactor thpsize_shmem_enabled_show() with helper arrays

[Lorenzo Stoakes <ljs@kernel.org>]

On Fri, May 22, 2026 at 11:35:01AM +0100, Lorenzo Stoakes wrote:
> On Mon, May 18, 2026 at 12:32:38PM +0000, ranxiaokai627@163.com wrote:
> > From: Ran Xiaokai <ran.xiaokai@zte.com.cn>
> >
> > Replace the hardcoded if/else chain of test_bit() calls and string
> > literals in thpsize_shmem_enabled_show() with a loop over
> > huge_shmem_orders_by_mode[] and huge_shmem_enabled_mode_strings[] arrays.
> >
> > This makes thpsize_shmem_enabled_show() consistent with
> > thpsize_shmem_enabled_store() and eliminates duplicated mode name strings.
> >
> > Signed-off-by: Ran Xiaokai <ran.xiaokai@zte.com.cn>
>
> From: ranxiaokai627@163.com
>
> This does not match the From: field of the email.
>
> This is violating kernel process. See
> https://docs.kernel.org/process/submitting-patches.html
>
> Please either update this to your 163 email account or resend from your
> zte.com.cn address, otherwise we can't take this.

Apologies - I'm apparently blind :)

You provided this in-body, there's no issue, ignore this!

Thanks, Lorenzo

>
> Cheers, Lorenzo
>
> > Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
> > Tested-by: Baolin Wang <baolin.wang@linux.alibaba.com>
> > Reviewed-by: Breno Leitao <leitao@debian.org>
> > Reviewed-by: Lorenzo Stoakes <ljs@kernel.org>
> > ---
> >  mm/shmem.c | 36 +++++++++++++++++++++++-------------
> >  1 file changed, 23 insertions(+), 13 deletions(-)
> >
> > diff --git a/mm/shmem.c b/mm/shmem.c
> > index 46d2cfc30823..197c9cc314c5 100644
> > --- a/mm/shmem.c
> > +++ b/mm/shmem.c
> > @@ -5553,20 +5553,30 @@ static ssize_t thpsize_shmem_enabled_show(struct kobject *kobj,
> >  					  struct kobj_attribute *attr, char *buf)
> >  {
> >  	int order = to_thpsize(kobj)->order;
> > -	const char *output;
> > -
> > -	if (test_bit(order, &huge_shmem_orders_always))
> > -		output = "[always] inherit within_size advise never";
> > -	else if (test_bit(order, &huge_shmem_orders_inherit))
> > -		output = "always [inherit] within_size advise never";
> > -	else if (test_bit(order, &huge_shmem_orders_within_size))
> > -		output = "always inherit [within_size] advise never";
> > -	else if (test_bit(order, &huge_shmem_orders_madvise))
> > -		output = "always inherit within_size [advise] never";
> > -	else
> > -		output = "always inherit within_size advise [never]";
> > +	int active = HUGE_SHMEM_ENABLED_NEVER;
> > +	int len = 0;
> > +	int i;
> > +
> > +	for (i = 0; i < ARRAY_SIZE(huge_shmem_orders_by_mode); i++) {
> > +		if (test_bit(order, huge_shmem_orders_by_mode[i])) {
> > +			active = i;
> > +			break;
> > +		}
> > +	}
> > +
> > +	for (i = 0; i < ARRAY_SIZE(huge_shmem_enabled_mode_strings); i++) {
> > +		if (i == active)
> > +			len += sysfs_emit_at(buf, len, "[%s] ",
> > +					     huge_shmem_enabled_mode_strings[i]);
> > +		else
> > +			len += sysfs_emit_at(buf, len, "%s ",
> > +					     huge_shmem_enabled_mode_strings[i]);
> > +	}
> > +
> > +	/* Replace trailing space with newline */
> > +	buf[len - 1] = '\n';
> >
> > -	return sysfs_emit(buf, "%s\n", output);
> > +	return len;
> >  }
> >
> >  static bool set_shmem_enabled_mode(int order, enum huge_shmem_enabled_mode mode)
> > --
> > 2.25.1
> >
> >