From: Benjamin LaHaise <bcrl@kvack.org> To: Russell King - ARM Linux <linux@arm.linux.org.uk> Cc: Stephen Rothwell <sfr@canb.auug.org.au>, Geert Uytterhoeven <geert@linux-m68k.org>, Linux-Next <linux-next@vger.kernel.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, "linux-arm-kernel@lists.infradead.org" <linux-arm-kernel@lists.infradead.org> Subject: Re: linux-next: build failure after merge of the aio tree Date: Thu, 4 Feb 2016 11:01:01 -0500 [thread overview] Message-ID: <20160204160101.GD16315@kvack.org> (raw) In-Reply-To: <20160204143907.GG10826@n2100.arm.linux.org.uk> On Thu, Feb 04, 2016 at 02:39:07PM +0000, Russell King - ARM Linux wrote: > However, this one should warn: > > int test_wrong(char **v, const char **p) > { return __get_user(*v, p); } > > Good luck (I think you'll need lots of it to get a working solution)! :) This works with your test cases on x86-32. Note that it's only compile + link tested at present. -ben -- "Thought is the essence of where you are now." diff --git a/arch/x86/include/asm/uaccess.h b/arch/x86/include/asm/uaccess.h index 09b1b0a..d8834c2 100644 --- a/arch/x86/include/asm/uaccess.h +++ b/arch/x86/include/asm/uaccess.h @@ -326,7 +326,21 @@ do { \ } while (0) #ifdef CONFIG_X86_32 -#define __get_user_asm_u64(x, ptr, retval, errret) (x) = __get_user_bad() +#define __get_user_asm_u64(x, addr, err, errret) \ + asm volatile(ASM_STAC "\n" \ + "1: movl %2,%%eax\n" \ + " movl %3,%%edx\n" \ + "2: " ASM_CLAC "\n" \ + ".section .fixup,\"ax\"\n" \ + "3: mov %4,%0\n" \ + " xorl %%eax,%%eax\n" \ + " xorl %%edx,%%edx\n" \ + " jmp 2b\n" \ + ".previous\n" \ + _ASM_EXTABLE(1b, 3b) \ + : "=r" (err), "=A"(x) \ + : "m" (__m(addr)), "m" __m(((u32 *)addr) + 1), "i" (errret), "0" (err)) + #define __get_user_asm_ex_u64(x, ptr) (x) = __get_user_bad() #else #define __get_user_asm_u64(x, ptr, retval, errret) \
WARNING: multiple messages have this Message-ID (diff)
From: bcrl@kvack.org (Benjamin LaHaise) To: linux-arm-kernel@lists.infradead.org Subject: linux-next: build failure after merge of the aio tree Date: Thu, 4 Feb 2016 11:01:01 -0500 [thread overview] Message-ID: <20160204160101.GD16315@kvack.org> (raw) In-Reply-To: <20160204143907.GG10826@n2100.arm.linux.org.uk> On Thu, Feb 04, 2016 at 02:39:07PM +0000, Russell King - ARM Linux wrote: > However, this one should warn: > > int test_wrong(char **v, const char **p) > { return __get_user(*v, p); } > > Good luck (I think you'll need lots of it to get a working solution)! :) This works with your test cases on x86-32. Note that it's only compile + link tested at present. -ben -- "Thought is the essence of where you are now." diff --git a/arch/x86/include/asm/uaccess.h b/arch/x86/include/asm/uaccess.h index 09b1b0a..d8834c2 100644 --- a/arch/x86/include/asm/uaccess.h +++ b/arch/x86/include/asm/uaccess.h @@ -326,7 +326,21 @@ do { \ } while (0) #ifdef CONFIG_X86_32 -#define __get_user_asm_u64(x, ptr, retval, errret) (x) = __get_user_bad() +#define __get_user_asm_u64(x, addr, err, errret) \ + asm volatile(ASM_STAC "\n" \ + "1: movl %2,%%eax\n" \ + " movl %3,%%edx\n" \ + "2: " ASM_CLAC "\n" \ + ".section .fixup,\"ax\"\n" \ + "3: mov %4,%0\n" \ + " xorl %%eax,%%eax\n" \ + " xorl %%edx,%%edx\n" \ + " jmp 2b\n" \ + ".previous\n" \ + _ASM_EXTABLE(1b, 3b) \ + : "=r" (err), "=A"(x) \ + : "m" (__m(addr)), "m" __m(((u32 *)addr) + 1), "i" (errret), "0" (err)) + #define __get_user_asm_ex_u64(x, ptr) (x) = __get_user_bad() #else #define __get_user_asm_u64(x, ptr, retval, errret) \
next prev parent reply other threads:[~2016-02-04 16:01 UTC|newest] Thread overview: 71+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-01-12 5:40 linux-next: build failure after merge of the aio tree Stephen Rothwell 2016-01-12 16:38 ` Benjamin LaHaise 2016-01-27 2:40 ` Stephen Rothwell 2016-01-27 2:40 ` Stephen Rothwell 2016-01-29 11:30 ` Russell King - ARM Linux 2016-01-29 11:30 ` Russell King - ARM Linux 2016-01-29 12:03 ` Geert Uytterhoeven 2016-01-29 12:03 ` Geert Uytterhoeven 2016-01-29 12:03 ` Geert Uytterhoeven 2016-02-04 2:19 ` Stephen Rothwell 2016-02-04 2:19 ` Stephen Rothwell 2016-02-04 2:19 ` Stephen Rothwell 2016-02-04 13:41 ` Benjamin LaHaise 2016-02-04 13:41 ` Benjamin LaHaise 2016-02-04 13:41 ` Benjamin LaHaise 2016-02-04 13:50 ` Russell King - ARM Linux 2016-02-04 13:50 ` Russell King - ARM Linux 2016-02-04 13:50 ` Russell King - ARM Linux 2016-02-04 14:08 ` Benjamin LaHaise 2016-02-04 14:08 ` Benjamin LaHaise 2016-02-04 14:08 ` Benjamin LaHaise 2016-02-04 14:12 ` Russell King - ARM Linux 2016-02-04 14:12 ` Russell King - ARM Linux 2016-02-04 14:12 ` Russell King - ARM Linux 2016-02-04 14:32 ` Benjamin LaHaise 2016-02-04 14:32 ` Benjamin LaHaise 2016-02-04 14:32 ` Benjamin LaHaise 2016-02-04 14:39 ` Russell King - ARM Linux 2016-02-04 14:39 ` Russell King - ARM Linux 2016-02-04 14:39 ` Russell King - ARM Linux 2016-02-04 16:01 ` Benjamin LaHaise [this message] 2016-02-04 16:01 ` Benjamin LaHaise 2016-02-04 16:01 ` Benjamin LaHaise 2016-02-04 16:17 ` Russell King - ARM Linux 2016-02-04 16:17 ` Russell King - ARM Linux 2016-02-04 16:17 ` Russell King - ARM Linux 2016-02-04 16:27 ` Benjamin LaHaise 2016-02-04 16:27 ` Benjamin LaHaise 2016-02-04 16:27 ` Benjamin LaHaise 2016-02-04 16:47 ` Benjamin LaHaise 2016-02-04 16:47 ` Benjamin LaHaise 2016-02-04 16:47 ` Benjamin LaHaise 2016-02-04 18:48 ` Benjamin LaHaise 2016-02-04 18:48 ` Benjamin LaHaise 2016-02-04 18:48 ` Benjamin LaHaise 2016-01-15 2:24 ` Stephen Rothwell 2016-01-15 7:39 ` Christoph Hellwig 2016-01-15 9:23 ` Stephen Rothwell 2016-01-15 9:25 ` Christoph Hellwig 2016-01-15 15:18 ` Benjamin LaHaise 2016-01-15 22:55 ` Stephen Rothwell 2016-03-14 4:49 ` Stephen Rothwell 2016-03-14 17:08 ` Benjamin LaHaise 2016-03-14 20:41 ` Stephen Rothwell -- strict thread matches above, loose matches on Subject: below -- 2016-03-15 6:46 Stephen Rothwell 2016-03-15 6:46 ` Stephen Rothwell 2016-03-15 14:38 ` Andy Shevchenko 2016-03-15 16:42 ` Arnd Bergmann 2016-03-15 16:19 ` Sudip Mukherjee 2016-03-15 16:22 ` Benjamin LaHaise 2016-03-15 22:02 ` Arnd Bergmann 2016-03-16 11:12 ` Andy Shevchenko 2016-03-16 13:59 ` Arnd Bergmann 2016-03-16 14:07 ` Benjamin LaHaise 2013-08-30 7:55 Stephen Rothwell 2013-08-30 14:26 ` Benjamin LaHaise 2013-08-30 17:38 ` Linus Torvalds 2013-08-30 17:42 ` Benjamin LaHaise 2013-08-21 7:45 Stephen Rothwell 2013-08-21 15:52 ` Dave Kleikamp 2013-08-21 23:53 ` Stephen Rothwell
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