Messages in this thread Patch in this message | | | Date | Mon, 31 Jan 2022 02:29:06 +0000 | From | Al Viro <> | Subject | Re: [tip:x86/core 1/1] arch/x86/um/../lib/csum-partial_64.c:98:12: error: implicit declaration of function 'load_unaligned_zeropad' |
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On Wed, Dec 29, 2021 at 06:00:56AM +0000, Al Viro wrote: > On Thu, Nov 18, 2021 at 05:00:58PM +0100, Peter Zijlstra wrote: > > > Dear um folks, is this indeed the best solution? It's a bit sad to have > > to add this to x86_64, but if that's the way it is... > > Something like this, perhaps? (absolutely untested)
[snip] AFAICS, this (on top of current mainline) does the right thing.
commit 6692531df62d812de5d22c8bca0d90edc163aa84 Author: Al Viro <viro@zeniv.linux.org.uk> Date: Sun Jan 30 21:25:53 2022 -0500
uml/x86: use x86 load_unaligned_zeropad() allows, among other things, to drop !DCACHE_WORD_ACCESS mess in x86 csum-partial_64.c Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/arch/um/include/asm/Kbuild b/arch/um/include/asm/Kbuild index e5a7b552bb384..a58b67ec8119d 100644 --- a/arch/um/include/asm/Kbuild +++ b/arch/um/include/asm/Kbuild @@ -23,7 +23,6 @@ generic-y += softirq_stack.h generic-y += switch_to.h generic-y += topology.h generic-y += trace_clock.h -generic-y += word-at-a-time.h generic-y += kprobes.h generic-y += mm_hooks.h generic-y += vga.h diff --git a/arch/x86/lib/csum-partial_64.c b/arch/x86/lib/csum-partial_64.c index 1f8a8f8951738..50734a23034c4 100644 --- a/arch/x86/lib/csum-partial_64.c +++ b/arch/x86/lib/csum-partial_64.c @@ -93,7 +93,6 @@ __wsum csum_partial(const void *buff, int len, __wsum sum) buff += 8; } if (len & 7) { -#ifdef CONFIG_DCACHE_WORD_ACCESS unsigned int shift = (8 - (len & 7)) * 8; unsigned long trail; @@ -103,31 +102,6 @@ __wsum csum_partial(const void *buff, int len, __wsum sum) "adcq $0,%[res]" : [res] "+r" (temp64) : [trail] "r" (trail)); -#else - if (len & 4) { - asm("addq %[val],%[res]\n\t" - "adcq $0,%[res]" - : [res] "+r" (temp64) - : [val] "r" ((u64)*(u32 *)buff) - : "memory"); - buff += 4; - } - if (len & 2) { - asm("addq %[val],%[res]\n\t" - "adcq $0,%[res]" - : [res] "+r" (temp64) - : [val] "r" ((u64)*(u16 *)buff) - : "memory"); - buff += 2; - } - if (len & 1) { - asm("addq %[val],%[res]\n\t" - "adcq $0,%[res]" - : [res] "+r" (temp64) - : [val] "r" ((u64)*(u8 *)buff) - : "memory"); - } -#endif } result = add32_with_carry(temp64 >> 32, temp64 & 0xffffffff); if (unlikely(odd)) { diff --git a/arch/x86/um/Kconfig b/arch/x86/um/Kconfig index 40d6a06e41c81..4eb47d3ba6250 100644 --- a/arch/x86/um/Kconfig +++ b/arch/x86/um/Kconfig @@ -8,6 +8,7 @@ endmenu config UML_X86 def_bool y + select DCACHE_WORD_ACCESS config 64BIT bool "64-bit kernel" if "$(SUBARCH)" = "x86"
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