| Message ID | c5563eeea36aae7bd72ea2e985bc610d585ece40.1604306433.git.yepeilin.cs@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v2,1/2] console: Remove dummy con_font_op() callback implementations | expand |
On 02. 11. 20, 10:36, Peilin Ye wrote: > `struct console_font` is a UAPI structure, thus ideally should not be > used for kernel internal abstraction. Remove some dummy .con_font_set, > .con_font_default and .con_font_copy `struct consw` callback > implementations, to make it cleaner. ESEMANTIC_ERROR. 1) What do you refer to with the last "it"? 2) What's the purpose of mentioning struct console_font at all? 3) Could you clarify whether you checked it is safe to remove the hooks? 4) All the hooks now return ENOSYS for both consoles (and not 0). Is this intentional? I know answers to the first 3 questions, but you need to elaborate a bit in the commit log to connect those sentences. Esp. for people not dealing with the code on a daily basis. Ad 4) I am not sure. > Suggested-by: Daniel Vetter <daniel@ffwll.ch> > Signed-off-by: Peilin Ye <yepeilin.cs@gmail.com> > --- > Change in v2: > - [v2 2/2] no longer Cc: stable, so do not Cc: stable > > Context: https://lore.kernel.org/lkml/CAKMK7uFY2zv0adjKJ_ORVFT7Zzwn075MaU0rEU7_FuqENLR=UA@mail.gmail.com/ > > drivers/usb/misc/sisusbvga/sisusb_con.c | 21 --------------------- > drivers/video/console/dummycon.c | 20 -------------------- > 2 files changed, 41 deletions(-) > > diff --git a/drivers/usb/misc/sisusbvga/sisusb_con.c b/drivers/usb/misc/sisusbvga/sisusb_con.c > index c63e545fb105..dfa0d5ce6012 100644 > --- a/drivers/usb/misc/sisusbvga/sisusb_con.c > +++ b/drivers/usb/misc/sisusbvga/sisusb_con.c > @@ -1345,24 +1345,6 @@ static int sisusbdummycon_blank(struct vc_data *vc, int blank, int mode_switch) > return 0; > } > > -static int sisusbdummycon_font_set(struct vc_data *vc, > - struct console_font *font, > - unsigned int flags) > -{ > - return 0; > -} > - > -static int sisusbdummycon_font_default(struct vc_data *vc, > - struct console_font *font, char *name) > -{ > - return 0; > -} > - > -static int sisusbdummycon_font_copy(struct vc_data *vc, int con) > -{ > - return 0; > -} > - > static const struct consw sisusb_dummy_con = { > .owner = THIS_MODULE, > .con_startup = sisusbdummycon_startup, > @@ -1375,9 +1357,6 @@ static const struct consw sisusb_dummy_con = { > .con_scroll = sisusbdummycon_scroll, > .con_switch = sisusbdummycon_switch, > .con_blank = sisusbdummycon_blank, > - .con_font_set = sisusbdummycon_font_set, > - .con_font_default = sisusbdummycon_font_default, > - .con_font_copy = sisusbdummycon_font_copy, > }; > > int > diff --git a/drivers/video/console/dummycon.c b/drivers/video/console/dummycon.c > index 2a0d0bda7faa..f1711b2f9ff0 100644 > --- a/drivers/video/console/dummycon.c > +++ b/drivers/video/console/dummycon.c > @@ -124,23 +124,6 @@ static int dummycon_switch(struct vc_data *vc) > return 0; > } > > -static int dummycon_font_set(struct vc_data *vc, struct console_font *font, > - unsigned int flags) > -{ > - return 0; > -} > - > -static int dummycon_font_default(struct vc_data *vc, > - struct console_font *font, char *name) > -{ > - return 0; > -} > - > -static int dummycon_font_copy(struct vc_data *vc, int con) > -{ > - return 0; > -} > - > /* > * The console `switch' structure for the dummy console > * > @@ -159,8 +142,5 @@ const struct consw dummy_con = { > .con_scroll = dummycon_scroll, > .con_switch = dummycon_switch, > .con_blank = dummycon_blank, > - .con_font_set = dummycon_font_set, > - .con_font_default = dummycon_font_default, > - .con_font_copy = dummycon_font_copy, > }; > EXPORT_SYMBOL_GPL(dummy_con); >
On Mon, Nov 02, 2020 at 10:47:55AM +0100, Jiri Slaby wrote: > On 02. 11. 20, 10:36, Peilin Ye wrote: > > `struct console_font` is a UAPI structure, thus ideally should not be > > used for kernel internal abstraction. Remove some dummy .con_font_set, > > .con_font_default and .con_font_copy `struct consw` callback > > implementations, to make it cleaner. > > ESEMANTIC_ERROR. > > 1) What do you refer to with the last "it"? > > 2) What's the purpose of mentioning struct console_font at all? > > 3) Could you clarify whether you checked it is safe to remove the hooks? > > 4) All the hooks now return ENOSYS for both consoles (and not 0). Is this > intentional? > > I know answers to the first 3 questions, but you need to elaborate a bit in > the commit log to connect those sentences. Esp. for people not dealing with > the code on a daily basis. Ad 4) I am not sure. Yup the behaviour change from 4) needs to be called out. I think this should then also be done as part of the large patch series to remove the dummy functions from all console drivers. I don't expect the errno change to cause trouble, and it's the more honest errno - changing fonts not supported is the truth. But if it is, we can patch that up appropriately when we get a regression report. That's kinda unavoidable with old crufty uapi like this one here. Also a bikeshed: Additional information like the patch changelog or reasons why you do something is imo best to include in the commit message itself. It ends up looking a bit less tidy sometimes, but often there's crucial information in these parts that was accidentally left out from the commit message. Thanks, Daniel > > > Suggested-by: Daniel Vetter <daniel@ffwll.ch> > > Signed-off-by: Peilin Ye <yepeilin.cs@gmail.com> > > --- > > Change in v2: > > - [v2 2/2] no longer Cc: stable, so do not Cc: stable > > > > Context: https://lore.kernel.org/lkml/CAKMK7uFY2zv0adjKJ_ORVFT7Zzwn075MaU0rEU7_FuqENLR=UA@mail.gmail.com/ > > > > drivers/usb/misc/sisusbvga/sisusb_con.c | 21 --------------------- > > drivers/video/console/dummycon.c | 20 -------------------- > > 2 files changed, 41 deletions(-) > > > > diff --git a/drivers/usb/misc/sisusbvga/sisusb_con.c b/drivers/usb/misc/sisusbvga/sisusb_con.c > > index c63e545fb105..dfa0d5ce6012 100644 > > --- a/drivers/usb/misc/sisusbvga/sisusb_con.c > > +++ b/drivers/usb/misc/sisusbvga/sisusb_con.c > > @@ -1345,24 +1345,6 @@ static int sisusbdummycon_blank(struct vc_data *vc, int blank, int mode_switch) > > return 0; > > } > > -static int sisusbdummycon_font_set(struct vc_data *vc, > > - struct console_font *font, > > - unsigned int flags) > > -{ > > - return 0; > > -} > > - > > -static int sisusbdummycon_font_default(struct vc_data *vc, > > - struct console_font *font, char *name) > > -{ > > - return 0; > > -} > > - > > -static int sisusbdummycon_font_copy(struct vc_data *vc, int con) > > -{ > > - return 0; > > -} > > - > > static const struct consw sisusb_dummy_con = { > > .owner = THIS_MODULE, > > .con_startup = sisusbdummycon_startup, > > @@ -1375,9 +1357,6 @@ static const struct consw sisusb_dummy_con = { > > .con_scroll = sisusbdummycon_scroll, > > .con_switch = sisusbdummycon_switch, > > .con_blank = sisusbdummycon_blank, > > - .con_font_set = sisusbdummycon_font_set, > > - .con_font_default = sisusbdummycon_font_default, > > - .con_font_copy = sisusbdummycon_font_copy, > > }; > > int > > diff --git a/drivers/video/console/dummycon.c b/drivers/video/console/dummycon.c > > index 2a0d0bda7faa..f1711b2f9ff0 100644 > > --- a/drivers/video/console/dummycon.c > > +++ b/drivers/video/console/dummycon.c > > @@ -124,23 +124,6 @@ static int dummycon_switch(struct vc_data *vc) > > return 0; > > } > > -static int dummycon_font_set(struct vc_data *vc, struct console_font *font, > > - unsigned int flags) > > -{ > > - return 0; > > -} > > - > > -static int dummycon_font_default(struct vc_data *vc, > > - struct console_font *font, char *name) > > -{ > > - return 0; > > -} > > - > > -static int dummycon_font_copy(struct vc_data *vc, int con) > > -{ > > - return 0; > > -} > > - > > /* > > * The console `switch' structure for the dummy console > > * > > @@ -159,8 +142,5 @@ const struct consw dummy_con = { > > .con_scroll = dummycon_scroll, > > .con_switch = dummycon_switch, > > .con_blank = dummycon_blank, > > - .con_font_set = dummycon_font_set, > > - .con_font_default = dummycon_font_default, > > - .con_font_copy = dummycon_font_copy, > > }; > > EXPORT_SYMBOL_GPL(dummy_con); > > > > > -- > js > suse labs
On Mon, Nov 02, 2020 at 11:13:47AM +0100, Daniel Vetter wrote: > On Mon, Nov 02, 2020 at 10:47:55AM +0100, Jiri Slaby wrote: > > On 02. 11. 20, 10:36, Peilin Ye wrote: > > > `struct console_font` is a UAPI structure, thus ideally should not be > > > used for kernel internal abstraction. Remove some dummy .con_font_set, > > > .con_font_default and .con_font_copy `struct consw` callback > > > implementations, to make it cleaner. > > > > ESEMANTIC_ERROR. > > > > 1) What do you refer to with the last "it"? > > > > 2) What's the purpose of mentioning struct console_font at all? > > > > 3) Could you clarify whether you checked it is safe to remove the hooks? I see. I will try to elaborate in future patches, thank you! > > 4) All the hooks now return ENOSYS for both consoles (and not 0). Is this > > intentional? > > > > I know answers to the first 3 questions, but you need to elaborate a bit in > > the commit log to connect those sentences. Esp. for people not dealing with > > the code on a daily basis. Ad 4) I am not sure. > > Yup the behaviour change from 4) needs to be called out. I think this > should then also be done as part of the large patch series to remove the > dummy functions from all console drivers. > > I don't expect the errno change to cause trouble, and it's the more honest > errno - changing fonts not supported is the truth. But if it is, we can > patch that up appropriately when we get a regression report. That's kinda > unavoidable with old crufty uapi like this one here. > > Also a bikeshed: Additional information like the patch changelog or > reasons why you do something is imo best to include in the commit message > itself. It ends up looking a bit less tidy sometimes, but often there's > crucial information in these parts that was accidentally left out from the > commit message. Sure, I will try to include sufficient information for one to easily understand what I'm trying to do with a patch. Thank you, Peilin
diff --git a/drivers/usb/misc/sisusbvga/sisusb_con.c b/drivers/usb/misc/sisusbvga/sisusb_con.c index c63e545fb105..dfa0d5ce6012 100644 --- a/drivers/usb/misc/sisusbvga/sisusb_con.c +++ b/drivers/usb/misc/sisusbvga/sisusb_con.c @@ -1345,24 +1345,6 @@ static int sisusbdummycon_blank(struct vc_data *vc, int blank, int mode_switch) return 0; } -static int sisusbdummycon_font_set(struct vc_data *vc, - struct console_font *font, - unsigned int flags) -{ - return 0; -} - -static int sisusbdummycon_font_default(struct vc_data *vc, - struct console_font *font, char *name) -{ - return 0; -} - -static int sisusbdummycon_font_copy(struct vc_data *vc, int con) -{ - return 0; -} - static const struct consw sisusb_dummy_con = { .owner = THIS_MODULE, .con_startup = sisusbdummycon_startup, @@ -1375,9 +1357,6 @@ static const struct consw sisusb_dummy_con = { .con_scroll = sisusbdummycon_scroll, .con_switch = sisusbdummycon_switch, .con_blank = sisusbdummycon_blank, - .con_font_set = sisusbdummycon_font_set, - .con_font_default = sisusbdummycon_font_default, - .con_font_copy = sisusbdummycon_font_copy, }; int diff --git a/drivers/video/console/dummycon.c b/drivers/video/console/dummycon.c index 2a0d0bda7faa..f1711b2f9ff0 100644 --- a/drivers/video/console/dummycon.c +++ b/drivers/video/console/dummycon.c @@ -124,23 +124,6 @@ static int dummycon_switch(struct vc_data *vc) return 0; } -static int dummycon_font_set(struct vc_data *vc, struct console_font *font, - unsigned int flags) -{ - return 0; -} - -static int dummycon_font_default(struct vc_data *vc, - struct console_font *font, char *name) -{ - return 0; -} - -static int dummycon_font_copy(struct vc_data *vc, int con) -{ - return 0; -} - /* * The console `switch' structure for the dummy console * @@ -159,8 +142,5 @@ const struct consw dummy_con = { .con_scroll = dummycon_scroll, .con_switch = dummycon_switch, .con_blank = dummycon_blank, - .con_font_set = dummycon_font_set, - .con_font_default = dummycon_font_default, - .con_font_copy = dummycon_font_copy, }; EXPORT_SYMBOL_GPL(dummy_con);
`struct console_font` is a UAPI structure, thus ideally should not be used for kernel internal abstraction. Remove some dummy .con_font_set, .con_font_default and .con_font_copy `struct consw` callback implementations, to make it cleaner. Suggested-by: Daniel Vetter <daniel@ffwll.ch> Signed-off-by: Peilin Ye <yepeilin.cs@gmail.com> --- Change in v2: - [v2 2/2] no longer Cc: stable, so do not Cc: stable Context: https://lore.kernel.org/lkml/CAKMK7uFY2zv0adjKJ_ORVFT7Zzwn075MaU0rEU7_FuqENLR=UA@mail.gmail.com/ drivers/usb/misc/sisusbvga/sisusb_con.c | 21 --------------------- drivers/video/console/dummycon.c | 20 -------------------- 2 files changed, 41 deletions(-)