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Date: Wed, 31 Jan 2018 16:07:51 +0000
From: Matt Redfearn <matt.redfearn@...s.com>
To: Antony Pavlov <antonynpavlov@...il.com>,
<linux-mips@...ux-mips.org>
CC: James Hogan <jhogan@...nel.org>,
Ralf Baechle <ralf@...ux-mips.org>,
<linux-kernel@...r.kernel.org>, Palmer Dabbelt <palmer@...ive.com>
Subject: Re: [PATCH v3 2/2] MIPS: use generic GCC library routines from lib/
Hi,
On 31/01/18 15:33, Antony Pavlov wrote:
> The commit b35cd9884fa5 ("lib: Add shared copies of
> some GCC library routines") makes it possible
> to share generic GCC library routines by several
> architectures.
>
> This commit removes several generic GCC library
> routines from arch/mips/lib/ in favour of similar
> routines from lib/.
>
> Signed-off-by: Antony Pavlov <antonynpavlov@...il.com>
> Cc: Palmer Dabbelt <palmer@...ive.com>
> Cc: Matt Redfearn <matt.redfearn@...s.com>
> Cc: James Hogan <jhogan@...nel.org>
> Cc: Ralf Baechle <ralf@...ux-mips.org>
> Cc: linux-mips@...ux-mips.org
> Cc: linux-kernel@...r.kernel.org
> ---
> arch/mips/Kconfig | 5 +++++
> arch/mips/lib/Makefile | 2 +-
> arch/mips/lib/ashldi3.c | 30 ------------------------------
> arch/mips/lib/ashrdi3.c | 32 --------------------------------
> arch/mips/lib/cmpdi2.c | 28 ----------------------------
> arch/mips/lib/lshrdi3.c | 30 ------------------------------
> arch/mips/lib/ucmpdi2.c | 22 ----------------------
> 7 files changed, 6 insertions(+), 143 deletions(-)
>
> diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
> index 350a990fc719..b63a5422d485 100644
> --- a/arch/mips/Kconfig
> +++ b/arch/mips/Kconfig
> @@ -18,16 +18,21 @@ config MIPS
> select BUILDTIME_EXTABLE_SORT
> select CLONE_BACKWARDS
> select CPU_PM if CPU_IDLE
> + select GENERIC_ASHLDI3
> + select GENERIC_ASHRDI3
> select GENERIC_ATOMIC64 if !64BIT
> select GENERIC_CLOCKEVENTS
> select GENERIC_CMOS_UPDATE
> + select GENERIC_CMPDI2
> select GENERIC_CPU_AUTOPROBE
> select GENERIC_IRQ_PROBE
> select GENERIC_IRQ_SHOW
> + select GENERIC_LSHRDI3
> select GENERIC_PCI_IOMAP
> select GENERIC_SCHED_CLOCK if !CAVIUM_OCTEON_SOC
> select GENERIC_SMP_IDLE_THREAD
> select GENERIC_TIME_VSYSCALL
> + select GENERIC_UCMPDI2
> select HANDLE_DOMAIN_IRQ
> select HAVE_ARCH_JUMP_LABEL
> select HAVE_ARCH_KGDB
OK, thanks for changing this. But to be honest, it does look pretty
messy like this. I feel like the CONFIG names should be something a
little more descriptive, such as CONFIG_GENERIC_LIB_*, putting them in a
namespace that would at least group them all together. Right now, AFAIK
there's only RISC-V using these so it shouldn't be too painful to change
them. What do you think Antony / Palmer?
Thanks,
Matt
> diff --git a/arch/mips/lib/Makefile b/arch/mips/lib/Makefile
> index 78c2affeabf8..195ab4cb0840 100644
> --- a/arch/mips/lib/Makefile
> +++ b/arch/mips/lib/Makefile
> @@ -16,4 +16,4 @@ obj-$(CONFIG_CPU_R3000) += r3k_dump_tlb.o
> obj-$(CONFIG_CPU_TX39XX) += r3k_dump_tlb.o
>
> # libgcc-style stuff needed in the kernel
> -obj-y += ashldi3.o ashrdi3.o bswapsi.o bswapdi.o cmpdi2.o lshrdi3.o ucmpdi2.o
> +obj-y += bswapsi.o bswapdi.o
> diff --git a/arch/mips/lib/ashldi3.c b/arch/mips/lib/ashldi3.c
> deleted file mode 100644
> index 24cd6903e797..000000000000
> --- a/arch/mips/lib/ashldi3.c
> +++ /dev/null
> @@ -1,30 +0,0 @@
> -// SPDX-License-Identifier: GPL-2.0
> -#include <linux/export.h>
> -
> -#include "libgcc.h"
> -
> -long long notrace __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/mips/lib/ashrdi3.c b/arch/mips/lib/ashrdi3.c
> deleted file mode 100644
> index 23f5295af51e..000000000000
> --- a/arch/mips/lib/ashrdi3.c
> +++ /dev/null
> @@ -1,32 +0,0 @@
> -// SPDX-License-Identifier: GPL-2.0
> -#include <linux/export.h>
> -
> -#include "libgcc.h"
> -
> -long long notrace __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/mips/lib/cmpdi2.c b/arch/mips/lib/cmpdi2.c
> deleted file mode 100644
> index 93cfc785927d..000000000000
> --- a/arch/mips/lib/cmpdi2.c
> +++ /dev/null
> @@ -1,28 +0,0 @@
> -// SPDX-License-Identifier: GPL-2.0
> -#include <linux/export.h>
> -
> -#include "libgcc.h"
> -
> -word_type notrace __cmpdi2(long long a, long long b)
> -{
> - const DWunion au = {
> - .ll = a
> - };
> - const DWunion bu = {
> - .ll = b
> - };
> -
> - if (au.s.high < bu.s.high)
> - return 0;
> - else if (au.s.high > bu.s.high)
> - return 2;
> -
> - if ((unsigned int) au.s.low < (unsigned int) bu.s.low)
> - return 0;
> - else if ((unsigned int) au.s.low > (unsigned int) bu.s.low)
> - return 2;
> -
> - return 1;
> -}
> -
> -EXPORT_SYMBOL(__cmpdi2);
> diff --git a/arch/mips/lib/lshrdi3.c b/arch/mips/lib/lshrdi3.c
> deleted file mode 100644
> index 914b971aca3b..000000000000
> --- a/arch/mips/lib/lshrdi3.c
> +++ /dev/null
> @@ -1,30 +0,0 @@
> -// SPDX-License-Identifier: GPL-2.0
> -#include <linux/export.h>
> -
> -#include "libgcc.h"
> -
> -long long notrace __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);
> diff --git a/arch/mips/lib/ucmpdi2.c b/arch/mips/lib/ucmpdi2.c
> deleted file mode 100644
> index c31c78ca4175..000000000000
> --- a/arch/mips/lib/ucmpdi2.c
> +++ /dev/null
> @@ -1,22 +0,0 @@
> -// SPDX-License-Identifier: GPL-2.0
> -#include <linux/export.h>
> -
> -#include "libgcc.h"
> -
> -word_type notrace __ucmpdi2(unsigned long long a, unsigned long long b)
> -{
> - const DWunion au = {.ll = a};
> - const DWunion bu = {.ll = b};
> -
> - if ((unsigned int) au.s.high < (unsigned int) bu.s.high)
> - return 0;
> - else if ((unsigned int) au.s.high > (unsigned int) bu.s.high)
> - return 2;
> - if ((unsigned int) au.s.low < (unsigned int) bu.s.low)
> - return 0;
> - else if ((unsigned int) au.s.low > (unsigned int) bu.s.low)
> - return 2;
> - return 1;
> -}
> -
> -EXPORT_SYMBOL(__ucmpdi2);
>
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