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Message-ID: <alpine.LFD.2.20.1602181233480.13632@knanqh.ubzr>
Date: Thu, 18 Feb 2016 12:34:17 -0500 (EST)
From: Nicolas Pitre <nicolas.pitre@...aro.org>
To: Arnd Bergmann <arnd@...db.de>
cc: Russell King <linux@....linux.org.uk>,
linux-arm-kernel@...ts.infradead.org,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Jon Medhurst <tixy@...aro.org>,
Marc Zyngier <marc.zyngier@....com>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] [RESEND] ARM: fix copypage-*.c building with clang
On Thu, 18 Feb 2016, Arnd Bergmann wrote:
> clang does not allow inline assembly in __naked functions to
> have any register parameters and throws an error:
>
> arch/arm/mm/copypage-v4wb.c:47:9: error: parameter references not allowed in naked functions
> : "r" (kto), "r" (kfrom), "I" (PAGE_SIZE / 64));
>
> Fortunately, all of these functions are trivial to convert to
> using the registers directly.
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
Acked-by: Nicolas Pitre <nico@...aro.org>
> ---
> arch/arm/mm/copypage-feroceon.c | 4 ++--
> arch/arm/mm/copypage-v4mc.c | 26 +++++++++++++-------------
> arch/arm/mm/copypage-v4wb.c | 4 ++--
> arch/arm/mm/copypage-v4wt.c | 4 ++--
> arch/arm/mm/copypage-xsc3.c | 4 ++--
> arch/arm/mm/copypage-xscale.c | 4 ++--
> 6 files changed, 23 insertions(+), 23 deletions(-)
>
> diff --git a/arch/arm/mm/copypage-feroceon.c b/arch/arm/mm/copypage-feroceon.c
> index 49ee0c1a7209..e69bf2f15f32 100644
> --- a/arch/arm/mm/copypage-feroceon.c
> +++ b/arch/arm/mm/copypage-feroceon.c
> @@ -18,7 +18,7 @@ feroceon_copy_user_page(void *kto, const void *kfrom)
> {
> asm("\
> stmfd sp!, {r4-r9, lr} \n\
> - mov ip, %2 \n\
> + mov ip, %0 \n\
> 1: mov lr, r1 \n\
> ldmia r1!, {r2 - r9} \n\
> pld [lr, #32] \n\
> @@ -64,7 +64,7 @@ feroceon_copy_user_page(void *kto, const void *kfrom)
> mcr p15, 0, ip, c7, c10, 4 @ drain WB\n\
> ldmfd sp!, {r4-r9, pc}"
> :
> - : "r" (kto), "r" (kfrom), "I" (PAGE_SIZE));
> + : "I" (PAGE_SIZE));
> }
>
> void feroceon_copy_user_highpage(struct page *to, struct page *from,
> diff --git a/arch/arm/mm/copypage-v4mc.c b/arch/arm/mm/copypage-v4mc.c
> index 1267e64133b9..ea89722c00db 100644
> --- a/arch/arm/mm/copypage-v4mc.c
> +++ b/arch/arm/mm/copypage-v4mc.c
> @@ -45,23 +45,23 @@ mc_copy_user_page(void *from, void *to)
> {
> asm volatile(
> "stmfd sp!, {r4, lr} @ 2\n\
> - mov r4, %2 @ 1\n\
> - ldmia %0!, {r2, r3, ip, lr} @ 4\n\
> -1: mcr p15, 0, %1, c7, c6, 1 @ 1 invalidate D line\n\
> - stmia %1!, {r2, r3, ip, lr} @ 4\n\
> - ldmia %0!, {r2, r3, ip, lr} @ 4+1\n\
> - stmia %1!, {r2, r3, ip, lr} @ 4\n\
> - ldmia %0!, {r2, r3, ip, lr} @ 4\n\
> - mcr p15, 0, %1, c7, c6, 1 @ 1 invalidate D line\n\
> - stmia %1!, {r2, r3, ip, lr} @ 4\n\
> - ldmia %0!, {r2, r3, ip, lr} @ 4\n\
> + mov r4, %0 @ 1\n\
> + ldmia r0!, {r2, r3, ip, lr} @ 4\n\
> +1: mcr p15, 0, r1, c7, c6, 1 @ 1 invalidate D line\n\
> + stmia r1!, {r2, r3, ip, lr} @ 4\n\
> + ldmia r0!, {r2, r3, ip, lr} @ 4+1\n\
> + stmia r1!, {r2, r3, ip, lr} @ 4\n\
> + ldmia r0!, {r2, r3, ip, lr} @ 4\n\
> + mcr p15, 0, r1, c7, c6, 1 @ 1 invalidate D line\n\
> + stmia r1!, {r2, r3, ip, lr} @ 4\n\
> + ldmia r0!, {r2, r3, ip, lr} @ 4\n\
> subs r4, r4, #1 @ 1\n\
> - stmia %1!, {r2, r3, ip, lr} @ 4\n\
> - ldmneia %0!, {r2, r3, ip, lr} @ 4\n\
> + stmia r1!, {r2, r3, ip, lr} @ 4\n\
> + ldmneia r0!, {r2, r3, ip, lr} @ 4\n\
> bne 1b @ 1\n\
> ldmfd sp!, {r4, pc} @ 3"
> :
> - : "r" (from), "r" (to), "I" (PAGE_SIZE / 64));
> + : "I" (PAGE_SIZE / 64));
> }
>
> void v4_mc_copy_user_highpage(struct page *to, struct page *from,
> diff --git a/arch/arm/mm/copypage-v4wb.c b/arch/arm/mm/copypage-v4wb.c
> index 067d0fdd630c..7ea9cf07bd5c 100644
> --- a/arch/arm/mm/copypage-v4wb.c
> +++ b/arch/arm/mm/copypage-v4wb.c
> @@ -27,7 +27,7 @@ v4wb_copy_user_page(void *kto, const void *kfrom)
> {
> asm("\
> stmfd sp!, {r4, lr} @ 2\n\
> - mov r2, %2 @ 1\n\
> + mov r2, %0 @ 1\n\
> ldmia r1!, {r3, r4, ip, lr} @ 4\n\
> 1: mcr p15, 0, r0, c7, c6, 1 @ 1 invalidate D line\n\
> stmia r0!, {r3, r4, ip, lr} @ 4\n\
> @@ -44,7 +44,7 @@ v4wb_copy_user_page(void *kto, const void *kfrom)
> mcr p15, 0, r1, c7, c10, 4 @ 1 drain WB\n\
> ldmfd sp!, {r4, pc} @ 3"
> :
> - : "r" (kto), "r" (kfrom), "I" (PAGE_SIZE / 64));
> + : "I" (PAGE_SIZE / 64));
> }
>
> void v4wb_copy_user_highpage(struct page *to, struct page *from,
> diff --git a/arch/arm/mm/copypage-v4wt.c b/arch/arm/mm/copypage-v4wt.c
> index b85c5da2e510..c742ab24efd6 100644
> --- a/arch/arm/mm/copypage-v4wt.c
> +++ b/arch/arm/mm/copypage-v4wt.c
> @@ -25,7 +25,7 @@ v4wt_copy_user_page(void *kto, const void *kfrom)
> {
> asm("\
> stmfd sp!, {r4, lr} @ 2\n\
> - mov r2, %2 @ 1\n\
> + mov r2, %0 @ 1\n\
> ldmia r1!, {r3, r4, ip, lr} @ 4\n\
> 1: stmia r0!, {r3, r4, ip, lr} @ 4\n\
> ldmia r1!, {r3, r4, ip, lr} @ 4+1\n\
> @@ -40,7 +40,7 @@ v4wt_copy_user_page(void *kto, const void *kfrom)
> mcr p15, 0, r2, c7, c7, 0 @ flush ID cache\n\
> ldmfd sp!, {r4, pc} @ 3"
> :
> - : "r" (kto), "r" (kfrom), "I" (PAGE_SIZE / 64));
> + : "I" (PAGE_SIZE / 64));
> }
>
> void v4wt_copy_user_highpage(struct page *to, struct page *from,
> diff --git a/arch/arm/mm/copypage-xsc3.c b/arch/arm/mm/copypage-xsc3.c
> index 03a2042aced5..17e4e11c4612 100644
> --- a/arch/arm/mm/copypage-xsc3.c
> +++ b/arch/arm/mm/copypage-xsc3.c
> @@ -34,7 +34,7 @@ xsc3_mc_copy_user_page(void *kto, const void *kfrom)
> {
> asm("\
> stmfd sp!, {r4, r5, lr} \n\
> - mov lr, %2 \n\
> + mov lr, %0 \n\
> \n\
> pld [r1, #0] \n\
> pld [r1, #32] \n\
> @@ -67,7 +67,7 @@ xsc3_mc_copy_user_page(void *kto, const void *kfrom)
> \n\
> ldmfd sp!, {r4, r5, pc}"
> :
> - : "r" (kto), "r" (kfrom), "I" (PAGE_SIZE / 64 - 1));
> + : "I" (PAGE_SIZE / 64 - 1));
> }
>
> void xsc3_mc_copy_user_highpage(struct page *to, struct page *from,
> diff --git a/arch/arm/mm/copypage-xscale.c b/arch/arm/mm/copypage-xscale.c
> index 0fb85025344d..1034b4ce80cc 100644
> --- a/arch/arm/mm/copypage-xscale.c
> +++ b/arch/arm/mm/copypage-xscale.c
> @@ -45,7 +45,7 @@ mc_copy_user_page(void *from, void *to)
> */
> asm volatile(
> "stmfd sp!, {r4, r5, lr} \n\
> - mov lr, %2 \n\
> + mov lr, %0 \n\
> pld [r0, #0] \n\
> pld [r0, #32] \n\
> pld [r1, #0] \n\
> @@ -81,7 +81,7 @@ mc_copy_user_page(void *from, void *to)
> beq 2b \n\
> ldmfd sp!, {r4, r5, pc} "
> :
> - : "r" (from), "r" (to), "I" (PAGE_SIZE / 64 - 1));
> + : "I" (PAGE_SIZE / 64 - 1));
> }
>
> void xscale_mc_copy_user_highpage(struct page *to, struct page *from,
> --
> 2.7.0
>
>
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