lkml.org 
[lkml]   [2020]   [Nov]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
SubjectRe: [PATCH 4/5] mm: shmem: Convert shmem_enabled_show to use sysfs_emit_at
From
Date
On Sun, 2020-11-01 at 22:06 +0000, Matthew Wilcox wrote:
> On Sun, Nov 01, 2020 at 01:43:13PM -0800, Joe Perches wrote:
> > > Why did you change this?
> >
> > Are you asking about the function argument alignment or the commit message?
>
> The indentation. Don't change the fucking indentation, Joe.
>
> > > Look, this isn't performance sensitive code. Just do something simple.
> > >
> > > if (shmem_huge == values[i])
> > > buf += sysfs_emit(buf, "[%s]",
> > > shmem_format_huge(values[i]));
> > > else
> > > buf += sysfs_emit(buf, "%s",
> > > shmem_format_huge(values[i]));
> > > if (i == ARRAY_SIZE(values) - 1)
> > > buf += sysfs_emit(buf, "\n");
> > > else
> > > buf += sysfs_emit(buf, " ");
> > >
> > > Shame there's no sysfs_emitc, but there you go.
> >
> > I think what's there is simple.
>
> Again, you're wrong.
>
> > And your suggested code doesn't work.
> > sysfs_emit is used for single emits.
> > sysfs_emit_at is used for multiple emits.
>
> Oh, ugh, sysfs_emit() should be able to work on a buffer that isn't
> page aligned. Greg, how about this?
>
> +++ b/fs/sysfs/file.c
> @@ -722,13 +722,13 @@ int sysfs_emit(char *buf, const char *fmt, ...)
>  {
>         va_list args;
>         int len;
> + int start = offset_in_page(buf);
>  
>
> - if (WARN(!buf || offset_in_page(buf),
> - "invalid sysfs_emit: buf:%p\n", buf))
> + if (WARN(!buf, "invalid sysfs_emit: buf:%p\n", buf))
>                 return 0;
>  
>
>         va_start(args, fmt);
> - len = vscnprintf(buf, PAGE_SIZE, fmt, args);
> + len = vscnprintf(buf, PAGE_SIZE - start, fmt, args);
>         va_end(args);
>  
>
>         return len;
>


\
 
 \ /
  Last update: 2020-11-01 23:14    [W:0.056 / U:0.352 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site