From: "Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>
To: Jiri Slaby <jslaby@suse.cz>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-serial <linux-serial@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 12/36] tty/vt: consolemap: use sizeof(*pointer) instead of sizeof(type)
Date: Wed, 8 Jun 2022 10:23:45 +0300 (EEST) [thread overview]
Message-ID: <b2df9240-2b47-6fe3-4a65-3bdfcb961e4@linux.intel.com> (raw)
In-Reply-To: <37ced336-ac77-4c8f-1142-1f55c01383ca@suse.cz>
[-- Attachment #1: Type: text/plain, Size: 2405 bytes --]
On Tue, 7 Jun 2022, Jiri Slaby wrote:
> On 07. 06. 22, 16:00, Ilpo Järvinen wrote:
> > On Tue, 7 Jun 2022, Jiri Slaby wrote:
> >
> > > It is preferred to use sizeof(*pointer) instead of sizeof(type). First,
> > > the type of the variable can change and one needs not change the former
> > > (unlike the latter). Second, the latter is error-prone due to (u16),
> > > (u16 *), and (u16 **) mixture here.
> > >
> > > Signed-off-by: Jiri Slaby <jslaby@suse.cz>
> >
> > Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
> >
> > This seems fine but see the comments below which are not directly related
> > to the change itself.
> >
> > > ---
> > > drivers/tty/vt/consolemap.c | 23 ++++++++++++-----------
> > > 1 file changed, 12 insertions(+), 11 deletions(-)
> > >
> > > diff --git a/drivers/tty/vt/consolemap.c b/drivers/tty/vt/consolemap.c
> > > index 097ab7d01f8b..79a62dcca046 100644
> > > --- a/drivers/tty/vt/consolemap.c
> > > +++ b/drivers/tty/vt/consolemap.c
> > > @@ -251,12 +251,12 @@ static void set_inverse_trans_unicode(struct vc_data
> > > *conp,
> > > return;
> > > q = p->inverse_trans_unicode;
> > > if (!q) {
> > > - q = p->inverse_trans_unicode =
> > > - kmalloc_array(MAX_GLYPH, sizeof(u16), GFP_KERNEL);
> > > + q = p->inverse_trans_unicode = kmalloc_array(MAX_GLYPH,
> > > + sizeof(*q), GFP_KERNEL);
> > > if (!q)
> > > return;
> > > }
> > > - memset(q, 0, MAX_GLYPH * sizeof(u16));
> > > + memset(q, 0, MAX_GLYPH * sizeof(*q));
> >
> > Convert kmalloc_array into kcalloc and place memset() into else branch?
>
> IMO, the way it is now is more obvious.
Fair enough.
> > > @@ -514,11 +514,12 @@ con_insert_unipair(struct uni_pagedict *p, u_short
> > > unicode, u_short fontpos)
> > > n = UNI_ROW(unicode);
> > > p2 = p1[n];
> > > if (!p2) {
> > > - p2 = p1[n] = kmalloc_array(UNI_ROW_GLYPHS, sizeof(u16),
> > > GFP_KERNEL);
> > > + p2 = p1[n] = kmalloc_array(UNI_ROW_GLYPHS, sizeof(*p2),
> > > + GFP_KERNEL);
> > > if (!p2)
> > > return -ENOMEM;
> > > /* No glyphs for the characters (yet) */
> > > - memset(p2, 0xff, UNI_ROW_GLYPHS * sizeof(u16));
> > > + memset(p2, 0xff, UNI_ROW_GLYPHS * sizeof(*p2));
> >
> > This could have been kcalloc'ed.
>
> Why would you zero it before setting it to 0xff?
Yes, nevermind that. I obviously completely missed the fact it wasn't
memsetting to zero.
--
i.
next prev parent reply other threads:[~2022-06-08 7:56 UTC|newest]
Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-07 10:49 [PATCH 01/36] tty/vt: consolemap: use ARRAY_SIZE() Jiri Slaby
2022-06-07 10:49 ` [PATCH 02/36] tty/vt: consolemap: rename and document struct uni_pagedir Jiri Slaby
2022-06-07 12:36 ` Ilpo Järvinen
2022-06-08 5:42 ` Jiri Slaby
2022-06-07 10:49 ` [PATCH 03/36] tty/vt: consolemap: define UNI_* macros for constants Jiri Slaby
2022-06-07 13:21 ` Ilpo Järvinen
2022-06-08 6:55 ` Jiri Slaby
2022-06-08 9:54 ` Ilpo Järvinen
2022-06-07 10:49 ` [PATCH 04/36] tty/vt: consolemap: decrypt inverse_translate() Jiri Slaby
2022-06-07 12:54 ` Ilpo Järvinen
2022-06-07 10:49 ` [PATCH 05/36] tty/vt: consolemap: remove extern from function decls Jiri Slaby
2022-06-07 13:33 ` Ilpo Järvinen
2022-06-07 10:49 ` [PATCH 06/36] tty/vt: consolemap: convert macros to static inlines Jiri Slaby
2022-06-07 13:31 ` Ilpo Järvinen
2022-06-07 10:49 ` [PATCH 07/36] tty/vt: consolemap: make parameters of inverse_translate() saner Jiri Slaby
2022-06-07 13:32 ` Ilpo Järvinen
2022-06-07 10:49 ` [PATCH 08/36] tty/vt: consolemap: one line = one statement Jiri Slaby
2022-06-07 13:35 ` Ilpo Järvinen
2022-06-07 10:49 ` [PATCH 09/36] tty/vt: consolemap: use | for binary addition Jiri Slaby
2022-06-07 13:36 ` Ilpo Järvinen
2022-06-07 13:40 ` Ilpo Järvinen
2022-06-07 10:49 ` [PATCH 10/36] tty/vt: consolemap: introduce UNI_*() macros Jiri Slaby
2022-06-07 13:47 ` Ilpo Järvinen
2022-06-08 6:59 ` Jiri Slaby
2022-06-08 7:30 ` Jiri Slaby
2022-06-08 8:02 ` Ilpo Järvinen
2022-06-08 8:18 ` Jiri Slaby
2022-06-07 10:49 ` [PATCH 11/36] tty/vt: consolemap: zero uni_pgdir using kcalloc() Jiri Slaby
2022-06-07 13:51 ` Ilpo Järvinen
2022-06-07 10:49 ` [PATCH 12/36] tty/vt: consolemap: use sizeof(*pointer) instead of sizeof(type) Jiri Slaby
2022-06-07 14:00 ` Ilpo Järvinen
2022-06-07 18:13 ` Jiri Slaby
2022-06-08 7:23 ` Ilpo Järvinen [this message]
2022-06-07 10:49 ` [PATCH 13/36] tty/vt: consolemap: make con_set_unimap() more readable Jiri Slaby
2022-06-07 14:06 ` Ilpo Järvinen
2022-06-07 10:49 ` [PATCH 14/36] tty/vt: consolemap: make con_get_unimap() " Jiri Slaby
2022-06-07 14:11 ` Ilpo Järvinen
2022-06-07 10:49 ` [PATCH 15/36] tty/vt: consolemap: make p1 increment less confusing in con_get_unimap() Jiri Slaby
2022-06-07 10:49 ` [PATCH 16/36] tty/vt: consolemap: check put_user() " Jiri Slaby
2022-06-07 14:19 ` Ilpo Järvinen
2022-06-08 7:40 ` Jiri Slaby
2022-06-08 8:13 ` Ilpo Järvinen
2022-06-08 10:38 ` Andy Shevchenko
2022-06-08 10:43 ` Greg Kroah-Hartman
2022-06-08 8:02 ` David Laight
2022-06-08 8:11 ` Jiri Slaby
2022-06-08 8:13 ` Jiri Slaby
2022-06-09 8:51 ` Jiri Slaby
2022-06-07 10:49 ` [PATCH 17/36] tty/vt: consolemap: introduce enum translation_map and use it Jiri Slaby
2022-06-07 10:49 ` [PATCH 18/36] tty/vt: consolemap: remove glyph < 0 check from set_inverse_trans_unicode() Jiri Slaby
2022-06-07 10:49 ` [PATCH 19/36] tty/vt: consolemap: extract dict unsharing to con_unshare_unimap() Jiri Slaby
2022-06-07 14:30 ` Ilpo Järvinen
2022-06-07 10:49 ` [PATCH 20/36] tty/vt: consolemap: saner variable names in set_inverse_trans_unicode() Jiri Slaby
2022-06-07 14:34 ` Ilpo Järvinen
2022-06-07 10:49 ` [PATCH 21/36] tty/vt: consolemap: saner variable names in conv_uni_to_pc() Jiri Slaby
2022-06-07 10:49 ` [PATCH 22/36] tty/vt: consolemap: saner variable names in con_insert_unipair() Jiri Slaby
2022-06-07 10:49 ` [PATCH 23/36] tty/vt: consolemap: saner variable names in con_unify_unimap() Jiri Slaby
2022-06-07 10:49 ` [PATCH 24/36] tty/vt: consolemap: saner variable names in con_do_clear_unimap() Jiri Slaby
2022-06-07 10:49 ` [PATCH 25/36] tty/vt: consolemap: saner variable names in con_unshare_unimap() Jiri Slaby
2022-06-07 10:49 ` [PATCH 26/36] tty/vt: consolemap: saner variable names in con_release_unimap() Jiri Slaby
2022-06-07 10:49 ` [PATCH 27/36] tty/vt: consolemap: saner variable names in con_copy_unimap() Jiri Slaby
2022-06-07 10:49 ` [PATCH 28/36] tty/vt: consolemap: saner variable names in con_get_unimap() Jiri Slaby
2022-06-07 10:49 ` [PATCH 29/36] tty/vt: consolemap: saner variable names in con_set_unimap() Jiri Slaby
2022-06-07 10:49 ` [PATCH 30/36] tty/vt: consolemap: saner variable names in con_set_default_unimap() Jiri Slaby
2022-06-07 10:49 ` [PATCH 31/36] tty/vt: consolemap: make conv_uni_to_pc() more readable Jiri Slaby
2022-06-07 10:49 ` [PATCH 32/36] tty/vt: consolemap: remove superfluous whitespace Jiri Slaby
2022-06-07 10:49 ` [PATCH 33/36] tty/vt: consolemap: change refcount only if needed in con_do_clear_unimap() Jiri Slaby
2022-06-07 15:31 ` Ilpo Järvinen
2022-06-08 7:44 ` Jiri Slaby
2022-06-07 10:49 ` [PATCH 34/36] tty/vt: consolemap: extract con_allocate_new() from con_do_clear_unimap() Jiri Slaby
2022-06-07 10:49 ` [PATCH 35/36] tty/vt: consolemap: use con_allocate_new() in con_unshare_unimap() Jiri Slaby
2022-06-07 10:49 ` [PATCH 36/36] tty/vt: consolemap: walk the buffer only once in con_set_trans_old() Jiri Slaby
2022-06-07 16:25 ` Ilpo Järvinen
2022-06-07 12:36 ` [PATCH 01/36] tty/vt: consolemap: use ARRAY_SIZE() Ilpo Järvinen
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