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* [PATCH v2 resend] sh: Use generic GCC library routines
@ 2021-12-03 13:52 Geert Uytterhoeven
  2021-12-03 19:16 ` Palmer Dabbelt
  2021-12-03 22:58 ` kernel test robot
  0 siblings, 2 replies; 3+ messages in thread
From: Geert Uytterhoeven @ 2021-12-03 13:52 UTC (permalink / raw)
  To: Yoshinori Sato, Rich Felker, Masahiro Yamada
  Cc: Rob Landley, John Paul Adrian Glaubitz, Arnd Bergmann,
	Palmer Dabbelt, linux-sh, linux-kernel, Geert Uytterhoeven

The C implementations of __ashldi3(), __ashrdi3__(), and __lshrdi3() in
arch/sh/lib/ are identical to the generic C implementations in lib/.
Reduce duplication by switching SH to the generic versions.

Update the include path in arch/sh/boot/compressed accordingly.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
v2:
  - Fix silly typo in subject.

Tested on landisk and qemu/rts7751r2d.

Note that it also works without the change to arch/sh/boot/compressed/,
as lib/ashldi3.c can be reached via both include/uapi/../../lib/ashldi3.c
and arch/sh/boot/compressed/../../../../lib/ashldi3.c.

Palmer tried a similar thing before:
https://lore.kernel.org/linux-arch/20170523220546.16758-1-palmer@dabbelt.com/
but initially it broke the SH build due to a missing change to
arch/sh/boot/compressed/, and the later update never got picked up.
In the mean time, arch/sh/boot/compressed/ was changed, so his patch no
longer applies.

Similar for the other architectures, I guess?
---
 arch/sh/Kconfig                   |  3 +++
 arch/sh/boot/compressed/ashldi3.c |  4 ++--
 arch/sh/lib/Makefile              |  4 +---
 arch/sh/lib/ashldi3.c             | 30 -----------------------------
 arch/sh/lib/ashrdi3.c             | 32 -------------------------------
 arch/sh/lib/lshrdi3.c             | 30 -----------------------------
 6 files changed, 6 insertions(+), 97 deletions(-)
 delete mode 100644 arch/sh/lib/ashldi3.c
 delete mode 100644 arch/sh/lib/ashrdi3.c
 delete mode 100644 arch/sh/lib/lshrdi3.c

diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 70afb30e0b321183..b10c4d852c22852a 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -20,6 +20,9 @@ config SUPERH
 	select GENERIC_CMOS_UPDATE if SH_SH03 || SH_DREAMCAST
 	select GENERIC_IDLE_POLL_SETUP
 	select GENERIC_IRQ_SHOW
+	select GENERIC_LIB_ASHLDI3
+	select GENERIC_LIB_ASHRDI3
+	select GENERIC_LIB_LSHRDI3
 	select GENERIC_PCI_IOMAP if PCI
 	select GENERIC_SCHED_CLOCK
 	select GENERIC_SMP_IDLE_THREAD
diff --git a/arch/sh/boot/compressed/ashldi3.c b/arch/sh/boot/compressed/ashldi3.c
index 7cebd646df839b48..7c12121702309e8c 100644
--- a/arch/sh/boot/compressed/ashldi3.c
+++ b/arch/sh/boot/compressed/ashldi3.c
@@ -1,2 +1,2 @@
-// SPDX-License-Identifier: GPL-2.0-only
-#include "../../lib/ashldi3.c"
+// SPDX-License-Identifier: GPL-2.0-or-later
+#include "../../../../lib/ashldi3.c"
diff --git a/arch/sh/lib/Makefile b/arch/sh/lib/Makefile
index eb473d373ca43a4b..d20a0768b31fa2b6 100644
--- a/arch/sh/lib/Makefile
+++ b/arch/sh/lib/Makefile
@@ -7,9 +7,7 @@ lib-y  = delay.o memmove.o memchr.o \
 	 checksum.o strlen.o div64.o div64-generic.o
 
 # Extracted from libgcc
-obj-y += movmem.o ashldi3.o ashrdi3.o lshrdi3.o \
-	 ashlsi3.o ashrsi3.o ashiftrt.o lshrsi3.o \
-	 udiv_qrnnd.o
+obj-y += movmem.o ashlsi3.o ashrsi3.o ashiftrt.o lshrsi3.o udiv_qrnnd.o
 
 udivsi3-y			:= udivsi3_i4i-Os.o
 
diff --git a/arch/sh/lib/ashldi3.c b/arch/sh/lib/ashldi3.c
deleted file mode 100644
index e5afe0935847427f..0000000000000000
--- a/arch/sh/lib/ashldi3.c
+++ /dev/null
@@ -1,30 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-#include <linux/module.h>
-
-#include "libgcc.h"
-
-long long __ashldi3(long long u, word_type b)
-{
-	DWunion uu, w;
-	word_type bm;
-
-	if (b == 0)
-		return u;
-
-	uu.ll = u;
-	bm = 32 - b;
-
-	if (bm <= 0) {
-		w.s.low = 0;
-		w.s.high = (unsigned int) uu.s.low << -bm;
-	} else {
-		const unsigned int carries = (unsigned int) uu.s.low >> bm;
-
-		w.s.low = (unsigned int) uu.s.low << b;
-		w.s.high = ((unsigned int) uu.s.high << b) | carries;
-	}
-
-	return w.ll;
-}
-
-EXPORT_SYMBOL(__ashldi3);
diff --git a/arch/sh/lib/ashrdi3.c b/arch/sh/lib/ashrdi3.c
deleted file mode 100644
index ae263fbf25383b70..0000000000000000
--- a/arch/sh/lib/ashrdi3.c
+++ /dev/null
@@ -1,32 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-#include <linux/module.h>
-
-#include "libgcc.h"
-
-long long __ashrdi3(long long u, word_type b)
-{
-	DWunion uu, w;
-	word_type bm;
-
-	if (b == 0)
-		return u;
-
-	uu.ll = u;
-	bm = 32 - b;
-
-	if (bm <= 0) {
-		/* w.s.high = 1..1 or 0..0 */
-		w.s.high =
-		    uu.s.high >> 31;
-		w.s.low = uu.s.high >> -bm;
-	} else {
-		const unsigned int carries = (unsigned int) uu.s.high << bm;
-
-		w.s.high = uu.s.high >> b;
-		w.s.low = ((unsigned int) uu.s.low >> b) | carries;
-	}
-
-	return w.ll;
-}
-
-EXPORT_SYMBOL(__ashrdi3);
diff --git a/arch/sh/lib/lshrdi3.c b/arch/sh/lib/lshrdi3.c
deleted file mode 100644
index 33eaa1edbc3c0656..0000000000000000
--- a/arch/sh/lib/lshrdi3.c
+++ /dev/null
@@ -1,30 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-#include <linux/module.h>
-
-#include "libgcc.h"
-
-long long __lshrdi3(long long u, word_type b)
-{
-	DWunion uu, w;
-	word_type bm;
-
-	if (b == 0)
-		return u;
-
-	uu.ll = u;
-	bm = 32 - b;
-
-	if (bm <= 0) {
-		w.s.high = 0;
-		w.s.low = (unsigned int) uu.s.high >> -bm;
-	} else {
-		const unsigned int carries = (unsigned int) uu.s.high << bm;
-
-		w.s.high = (unsigned int) uu.s.high >> b;
-		w.s.low = ((unsigned int) uu.s.low >> b) | carries;
-	}
-
-	return w.ll;
-}
-
-EXPORT_SYMBOL(__lshrdi3);
-- 
2.25.1


^ permalink raw reply related	[flat|nested] 3+ messages in thread
* Re: [PATCH v2 resend] sh: Use generic GCC library routines
  2021-12-03 13:52 [PATCH v2 resend] sh: Use generic GCC library routines Geert Uytterhoeven
@ 2021-12-03 19:16 ` Palmer Dabbelt
  2021-12-03 22:58 ` kernel test robot
  1 sibling, 0 replies; 3+ messages in thread
From: Palmer Dabbelt @ 2021-12-03 19:16 UTC (permalink / raw)
  To: geert+renesas
  Cc: ysato, dalias, masahiroy, rob, glaubitz, Arnd Bergmann, linux-sh,
	linux-kernel, geert+renesas

On Fri, 03 Dec 2021 05:52:27 PST (-0800), geert+renesas@glider.be wrote:
> The C implementations of __ashldi3(), __ashrdi3__(), and __lshrdi3() in
> arch/sh/lib/ are identical to the generic C implementations in lib/.
> Reduce duplication by switching SH to the generic versions.
>
> Update the include path in arch/sh/boot/compressed accordingly.
>
> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
> ---
> v2:
>   - Fix silly typo in subject.
>
> Tested on landisk and qemu/rts7751r2d.
>
> Note that it also works without the change to arch/sh/boot/compressed/,
> as lib/ashldi3.c can be reached via both include/uapi/../../lib/ashldi3.c
> and arch/sh/boot/compressed/../../../../lib/ashldi3.c.
>
> Palmer tried a similar thing before:
> https://lore.kernel.org/linux-arch/20170523220546.16758-1-palmer@dabbelt.com/
> but initially it broke the SH build due to a missing change to
> arch/sh/boot/compressed/, and the later update never got picked up.
> In the mean time, arch/sh/boot/compressed/ was changed, so his patch no
> longer applies.


Acked-by: Palmer Dabbelt <palmer@rivosinc.com>

Sorry about that, I guess I forgot about this one.  I'm assuming this is 
going through some sort of SH tree, but LMK if there's anything you need 
from my end.

Thanks!

> Similar for the other architectures, I guess?

I though I sent those all along, but I guess I forgot about a handful of 
them.  Are you offering to pick that up?

> ---
>  arch/sh/Kconfig                   |  3 +++
>  arch/sh/boot/compressed/ashldi3.c |  4 ++--
>  arch/sh/lib/Makefile              |  4 +---
>  arch/sh/lib/ashldi3.c             | 30 -----------------------------
>  arch/sh/lib/ashrdi3.c             | 32 -------------------------------
>  arch/sh/lib/lshrdi3.c             | 30 -----------------------------
>  6 files changed, 6 insertions(+), 97 deletions(-)
>  delete mode 100644 arch/sh/lib/ashldi3.c
>  delete mode 100644 arch/sh/lib/ashrdi3.c
>  delete mode 100644 arch/sh/lib/lshrdi3.c
>
> diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
> index 70afb30e0b321183..b10c4d852c22852a 100644
> --- a/arch/sh/Kconfig
> +++ b/arch/sh/Kconfig
> @@ -20,6 +20,9 @@ config SUPERH
>  	select GENERIC_CMOS_UPDATE if SH_SH03 || SH_DREAMCAST
>  	select GENERIC_IDLE_POLL_SETUP
>  	select GENERIC_IRQ_SHOW
> +	select GENERIC_LIB_ASHLDI3
> +	select GENERIC_LIB_ASHRDI3
> +	select GENERIC_LIB_LSHRDI3
>  	select GENERIC_PCI_IOMAP if PCI
>  	select GENERIC_SCHED_CLOCK
>  	select GENERIC_SMP_IDLE_THREAD
> diff --git a/arch/sh/boot/compressed/ashldi3.c b/arch/sh/boot/compressed/ashldi3.c
> index 7cebd646df839b48..7c12121702309e8c 100644
> --- a/arch/sh/boot/compressed/ashldi3.c
> +++ b/arch/sh/boot/compressed/ashldi3.c
> @@ -1,2 +1,2 @@
> -// SPDX-License-Identifier: GPL-2.0-only
> -#include "../../lib/ashldi3.c"
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +#include "../../../../lib/ashldi3.c"
> diff --git a/arch/sh/lib/Makefile b/arch/sh/lib/Makefile
> index eb473d373ca43a4b..d20a0768b31fa2b6 100644
> --- a/arch/sh/lib/Makefile
> +++ b/arch/sh/lib/Makefile
> @@ -7,9 +7,7 @@ lib-y  = delay.o memmove.o memchr.o \
>  	 checksum.o strlen.o div64.o div64-generic.o
>
>  # Extracted from libgcc
> -obj-y += movmem.o ashldi3.o ashrdi3.o lshrdi3.o \
> -	 ashlsi3.o ashrsi3.o ashiftrt.o lshrsi3.o \
> -	 udiv_qrnnd.o
> +obj-y += movmem.o ashlsi3.o ashrsi3.o ashiftrt.o lshrsi3.o udiv_qrnnd.o
>
>  udivsi3-y			:= udivsi3_i4i-Os.o
>
> diff --git a/arch/sh/lib/ashldi3.c b/arch/sh/lib/ashldi3.c
> deleted file mode 100644
> index e5afe0935847427f..0000000000000000
> --- a/arch/sh/lib/ashldi3.c
> +++ /dev/null
> @@ -1,30 +0,0 @@
> -// SPDX-License-Identifier: GPL-2.0
> -#include <linux/module.h>
> -
> -#include "libgcc.h"
> -
> -long long __ashldi3(long long u, word_type b)
> -{
> -	DWunion uu, w;
> -	word_type bm;
> -
> -	if (b == 0)
> -		return u;
> -
> -	uu.ll = u;
> -	bm = 32 - b;
> -
> -	if (bm <= 0) {
> -		w.s.low = 0;
> -		w.s.high = (unsigned int) uu.s.low << -bm;
> -	} else {
> -		const unsigned int carries = (unsigned int) uu.s.low >> bm;
> -
> -		w.s.low = (unsigned int) uu.s.low << b;
> -		w.s.high = ((unsigned int) uu.s.high << b) | carries;
> -	}
> -
> -	return w.ll;
> -}
> -
> -EXPORT_SYMBOL(__ashldi3);
> diff --git a/arch/sh/lib/ashrdi3.c b/arch/sh/lib/ashrdi3.c
> deleted file mode 100644
> index ae263fbf25383b70..0000000000000000
> --- a/arch/sh/lib/ashrdi3.c
> +++ /dev/null
> @@ -1,32 +0,0 @@
> -// SPDX-License-Identifier: GPL-2.0
> -#include <linux/module.h>
> -
> -#include "libgcc.h"
> -
> -long long __ashrdi3(long long u, word_type b)
> -{
> -	DWunion uu, w;
> -	word_type bm;
> -
> -	if (b == 0)
> -		return u;
> -
> -	uu.ll = u;
> -	bm = 32 - b;
> -
> -	if (bm <= 0) {
> -		/* w.s.high = 1..1 or 0..0 */
> -		w.s.high =
> -		    uu.s.high >> 31;
> -		w.s.low = uu.s.high >> -bm;
> -	} else {
> -		const unsigned int carries = (unsigned int) uu.s.high << bm;
> -
> -		w.s.high = uu.s.high >> b;
> -		w.s.low = ((unsigned int) uu.s.low >> b) | carries;
> -	}
> -
> -	return w.ll;
> -}
> -
> -EXPORT_SYMBOL(__ashrdi3);
> diff --git a/arch/sh/lib/lshrdi3.c b/arch/sh/lib/lshrdi3.c
> deleted file mode 100644
> index 33eaa1edbc3c0656..0000000000000000
> --- a/arch/sh/lib/lshrdi3.c
> +++ /dev/null
> @@ -1,30 +0,0 @@
> -// SPDX-License-Identifier: GPL-2.0
> -#include <linux/module.h>
> -
> -#include "libgcc.h"
> -
> -long long __lshrdi3(long long u, word_type b)
> -{
> -	DWunion uu, w;
> -	word_type bm;
> -
> -	if (b == 0)
> -		return u;
> -
> -	uu.ll = u;
> -	bm = 32 - b;
> -
> -	if (bm <= 0) {
> -		w.s.high = 0;
> -		w.s.low = (unsigned int) uu.s.high >> -bm;
> -	} else {
> -		const unsigned int carries = (unsigned int) uu.s.high << bm;
> -
> -		w.s.high = (unsigned int) uu.s.high >> b;
> -		w.s.low = ((unsigned int) uu.s.low >> b) | carries;
> -	}
> -
> -	return w.ll;
> -}
> -
> -EXPORT_SYMBOL(__lshrdi3);

^ permalink raw reply	[flat|nested] 3+ messages in thread
* Re: [PATCH v2 resend] sh: Use generic GCC library routines
  2021-12-03 13:52 [PATCH v2 resend] sh: Use generic GCC library routines Geert Uytterhoeven
  2021-12-03 19:16 ` Palmer Dabbelt
@ 2021-12-03 22:58 ` kernel test robot
  1 sibling, 0 replies; 3+ messages in thread
From: kernel test robot @ 2021-12-03 22:58 UTC (permalink / raw)
  To: Geert Uytterhoeven, Yoshinori Sato, Rich Felker, Masahiro Yamada
  Cc: kbuild-all, Rob Landley, John Paul Adrian Glaubitz,
	Arnd Bergmann, Palmer Dabbelt, linux-sh, linux-kernel,
	Geert Uytterhoeven

Hi Geert,

I love your patch! Perhaps something to improve:

[auto build test WARNING on soc/for-next]
[also build test WARNING on linus/master v5.16-rc3 next-20211203]
[cannot apply to uclinux-h8/h8300-next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Geert-Uytterhoeven/sh-Use-generic-GCC-library-routines/20211203-215311
base:   https://git.kernel.org/pub/scm/linux/kernel/git/soc/soc.git for-next
config: sh-se7712_defconfig (https://download.01.org/0day-ci/archive/20211204/202112040630.oGvlSViB-lkp@intel.com/config)
compiler: sh4-linux-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/8bd73efbe5666e7df737c423c9269d039bb92f8b
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Geert-Uytterhoeven/sh-Use-generic-GCC-library-routines/20211203-215311
        git checkout 8bd73efbe5666e7df737c423c9269d039bb92f8b
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=sh SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   In file included from arch/sh/boot/compressed/ashldi3.c:2:
>> arch/sh/boot/compressed/../../../../lib/ashldi3.c:9:19: warning: no previous prototype for '__ashldi3' [-Wmissing-prototypes]
       9 | long long notrace __ashldi3(long long u, word_type b)
         |                   ^~~~~~~~~


vim +/__ashldi3 +9 arch/sh/boot/compressed/../../../../lib/ashldi3.c

b35cd9884fa5d8 Palmer Dabbelt 2017-05-23  8  
b35cd9884fa5d8 Palmer Dabbelt 2017-05-23 @9  long long notrace __ashldi3(long long u, word_type b)

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

^ permalink raw reply	[flat|nested] 3+ messages in thread
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2021-12-03 13:52 [PATCH v2 resend] sh: Use generic GCC library routines Geert Uytterhoeven
2021-12-03 19:16 ` Palmer Dabbelt
2021-12-03 22:58 ` kernel test robot

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