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Date: Sun, 31 May 2020 11:52:30 +0200 From: Geert Uytterhoeven <geert@...ux-m68k.org> To: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de> Cc: Linux-sh list <linux-sh@...r.kernel.org>, Rich Felker <dalias@...c.org>, Yoshinori Sato <ysato@...rs.sourceforge.jp>, Michael Karcher <kernel@...rcher.dialup.fu-berlin.de>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] sh: Implement __get_user_u64() required for 64-bit get_user() Hi Adrian, On Fri, May 29, 2020 at 7:46 PM John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de> wrote: > Trying to build the kernel with CONFIG_INFINIBAND_USER_ACCESS enabled fails > > ERROR: "__get_user_unknown" [drivers/infiniband/core/ib_uverbs.ko] undefined! > > with on SH since the kernel misses a 64-bit implementation of get_user(). > > Implement the missing 64-bit get_user() as __get_user_u64(), matching the > already existing __put_user_u64() which implements the 64-bit put_user(). > > Signed-off-by: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de> Thanks for your patch! > --- a/arch/sh/include/asm/uaccess_32.h > +++ b/arch/sh/include/asm/uaccess_32.h > @@ -26,6 +26,9 @@ do { \ > case 4: \ > __get_user_asm(x, ptr, retval, "l"); \ > break; \ > + case 8: \ > + __get_user_u64(x, ptr, retval); \ > + break; \ > default: \ > __get_user_unknown(); \ > break; \ > @@ -66,6 +69,52 @@ do { \ > > extern void __get_user_unknown(void); > > +#if defined(CONFIG_CPU_LITTLE_ENDIAN) > +#define __get_user_u64(x, addr, err) \ > +({ \ > +__asm__ __volatile__( \ > + "1:\n\t" \ > + "mov.l %2,%R1\n\t" \ > + "mov.l %T2,%S1\n\t" \ > + "2:\n" \ > + ".section .fixup,\"ax\"\n" \ > + "3:\n\t" \ > + "mov #0, %1\n\t" \ As this is the 64-bit variant, I think this single move should be replaced by a double move: "mov #0,%R1\n\t" \ "mov #0,%S1\n\t" \ Same for the big endian version below. Disclaimer: uncompiled, untested, no SH assembler expert. > + "mov.l 4f, %0\n\t" \ > + "jmp @%0\n\t" \ > + " mov %3, %0\n\t" \ > + ".balign 4\n" \ > + "4: .long 2b\n\t" \ > + ".previous\n" \ > + ".section __ex_table,\"a\"\n\t" \ > + ".long 1b, 3b\n\t" \ > + ".previous" \ > + :"=&r" (err), "=&r" (x) \ > + :"m" (__m(addr)), "i" (-EFAULT), "0" (err)); }) Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
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