From: Vincenzo Frascino <vincenzo.frascino@arm.com> To: Will Deacon <will@kernel.org> Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, ard.biesheuvel@linaro.org, ndesaulniers@google.com, catalin.marinas@arm.com, tglx@linutronix.de Subject: Re: [PATCH v3 3/5] arm64: vdso32: Fix compilation warning Date: Tue, 1 Oct 2019 15:41:31 +0100 [thread overview] Message-ID: <adc03e22-6317-a6c1-2d3c-e1fddcd97edd@arm.com> (raw) In-Reply-To: <20191001132108.jx2x7quyk2p2vyfw@willie-the-truck> On 10/1/19 2:21 PM, Will Deacon wrote: > On Thu, Sep 26, 2019 at 10:43:40PM +0100, Vincenzo Frascino wrote: >> As reported by Will Deacon the following compilation warning appears >> during the compilation of the vdso32: >> >> In file included from ./arch/arm64/include/asm/thread_info.h:17:0, >> from ./include/linux/thread_info.h:38, >> from ./arch/arm64/include/asm/preempt.h:5, >> from ./include/linux/preempt.h:78, >> from ./include/linux/spinlock.h:51, >> from ./include/linux/seqlock.h:36, >> from ./include/linux/time.h:6, >> from .../work/linux/lib/vdso/gettimeofday.c:7, >> from <command-line>:0: >> ./arch/arm64/include/asm/memory.h: In function ‘__tag_set’: >> ./arch/arm64/include/asm/memory.h:233:15: warning: cast from pointer to >> integer of different size [-Wpointer-to-int-cast] >> u64 __addr = (u64)addr & ~__tag_shifted(0xff); >> ^ >> In file included from ./arch/arm64/include/asm/pgtable-hwdef.h:8:0, >> from ./arch/arm64/include/asm/processor.h:34, >> from ./arch/arm64/include/asm/elf.h:118, >> from ./include/linux/elf.h:5, >> from ./include/linux/elfnote.h:62, >> from arch/arm64/kernel/vdso32/note.c:11: >> ./arch/arm64/include/asm/memory.h: In function ‘__tag_set’: >> ./arch/arm64/include/asm/memory.h:233:15: warning: cast from pointer to >> integer of different size [-Wpointer-to-int-cast] >> u64 __addr = (u64)addr & ~__tag_shifted(0xff); >> ^ >> >> This happens because few 64 bit compilation headers are included during >> the generation of vdso32. >> >> Fix the issue redefining the __tag_set function. >> >> Note: This fix is meant to be temporary, a more comprehensive solution >> based on the refactoring of the generic headers will be provided with a >> future patch set. At that point it will be possible to revert this patch. >> >> Cc: Will Deacon <will@kernel.org> >> Cc: Catalin Marinas <catalin.marinas@arm.com> >> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> >> --- >> arch/arm64/include/asm/memory.h | 3 +++ >> 1 file changed, 3 insertions(+) >> >> diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h >> index b61b50bf68b1..c61b2eb50a3b 100644 >> --- a/arch/arm64/include/asm/memory.h >> +++ b/arch/arm64/include/asm/memory.h >> @@ -228,11 +228,14 @@ static inline unsigned long kaslr_offset(void) >> #define __tag_get(addr) 0 >> #endif /* CONFIG_KASAN_SW_TAGS */ >> >> +#ifdef __aarch64__ >> +/* Do not attempt to compile this code with compat vdso */ >> static inline const void *__tag_set(const void *addr, u8 tag) >> { >> u64 __addr = (u64)addr & ~__tag_shifted(0xff); >> return (const void *)(__addr | __tag_shifted(tag)); >> } >> +#endif > > Sorry, but I'm not taking this. > > I know you're trying to fix the issues I reported as quickly as you can (and > thank you for that), but I'm sure that you agree this needs more thought to > develop a proper solution to what is a much bigger issue than can be solved > by sprinkling #ifdefs. I can live with the warning on the basis that a > proper fix is in the pipeline, but in the meantime it can serve as a > reminder that we're not done here. > This was my original preference as well, if we silence the warnings we tend to forget about them. Since you reported the issue as urgent, I reacted with something that fixes it temporarily, but I have not objections if you want to wait for a more comprehensive solution. > Will > -- Regards, Vincenzo
WARNING: multiple messages have this Message-ID (diff)
From: Vincenzo Frascino <vincenzo.frascino@arm.com> To: Will Deacon <will@kernel.org> Cc: ard.biesheuvel@linaro.org, catalin.marinas@arm.com, ndesaulniers@google.com, linux-kernel@vger.kernel.org, tglx@linutronix.de, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v3 3/5] arm64: vdso32: Fix compilation warning Date: Tue, 1 Oct 2019 15:41:31 +0100 [thread overview] Message-ID: <adc03e22-6317-a6c1-2d3c-e1fddcd97edd@arm.com> (raw) In-Reply-To: <20191001132108.jx2x7quyk2p2vyfw@willie-the-truck> On 10/1/19 2:21 PM, Will Deacon wrote: > On Thu, Sep 26, 2019 at 10:43:40PM +0100, Vincenzo Frascino wrote: >> As reported by Will Deacon the following compilation warning appears >> during the compilation of the vdso32: >> >> In file included from ./arch/arm64/include/asm/thread_info.h:17:0, >> from ./include/linux/thread_info.h:38, >> from ./arch/arm64/include/asm/preempt.h:5, >> from ./include/linux/preempt.h:78, >> from ./include/linux/spinlock.h:51, >> from ./include/linux/seqlock.h:36, >> from ./include/linux/time.h:6, >> from .../work/linux/lib/vdso/gettimeofday.c:7, >> from <command-line>:0: >> ./arch/arm64/include/asm/memory.h: In function ‘__tag_set’: >> ./arch/arm64/include/asm/memory.h:233:15: warning: cast from pointer to >> integer of different size [-Wpointer-to-int-cast] >> u64 __addr = (u64)addr & ~__tag_shifted(0xff); >> ^ >> In file included from ./arch/arm64/include/asm/pgtable-hwdef.h:8:0, >> from ./arch/arm64/include/asm/processor.h:34, >> from ./arch/arm64/include/asm/elf.h:118, >> from ./include/linux/elf.h:5, >> from ./include/linux/elfnote.h:62, >> from arch/arm64/kernel/vdso32/note.c:11: >> ./arch/arm64/include/asm/memory.h: In function ‘__tag_set’: >> ./arch/arm64/include/asm/memory.h:233:15: warning: cast from pointer to >> integer of different size [-Wpointer-to-int-cast] >> u64 __addr = (u64)addr & ~__tag_shifted(0xff); >> ^ >> >> This happens because few 64 bit compilation headers are included during >> the generation of vdso32. >> >> Fix the issue redefining the __tag_set function. >> >> Note: This fix is meant to be temporary, a more comprehensive solution >> based on the refactoring of the generic headers will be provided with a >> future patch set. At that point it will be possible to revert this patch. >> >> Cc: Will Deacon <will@kernel.org> >> Cc: Catalin Marinas <catalin.marinas@arm.com> >> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> >> --- >> arch/arm64/include/asm/memory.h | 3 +++ >> 1 file changed, 3 insertions(+) >> >> diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h >> index b61b50bf68b1..c61b2eb50a3b 100644 >> --- a/arch/arm64/include/asm/memory.h >> +++ b/arch/arm64/include/asm/memory.h >> @@ -228,11 +228,14 @@ static inline unsigned long kaslr_offset(void) >> #define __tag_get(addr) 0 >> #endif /* CONFIG_KASAN_SW_TAGS */ >> >> +#ifdef __aarch64__ >> +/* Do not attempt to compile this code with compat vdso */ >> static inline const void *__tag_set(const void *addr, u8 tag) >> { >> u64 __addr = (u64)addr & ~__tag_shifted(0xff); >> return (const void *)(__addr | __tag_shifted(tag)); >> } >> +#endif > > Sorry, but I'm not taking this. > > I know you're trying to fix the issues I reported as quickly as you can (and > thank you for that), but I'm sure that you agree this needs more thought to > develop a proper solution to what is a much bigger issue than can be solved > by sprinkling #ifdefs. I can live with the warning on the basis that a > proper fix is in the pipeline, but in the meantime it can serve as a > reminder that we're not done here. > This was my original preference as well, if we silence the warnings we tend to forget about them. Since you reported the issue as urgent, I reacted with something that fixes it temporarily, but I have not objections if you want to wait for a more comprehensive solution. > Will > -- Regards, Vincenzo _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2019-10-01 14:39 UTC|newest] Thread overview: 127+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-09-20 14:27 Problems with arm64 compat vdso Will Deacon 2019-09-20 16:33 ` Vincenzo Frascino 2019-09-23 16:41 ` Ard Biesheuvel 2019-09-24 12:11 ` Vincenzo Frascino 2019-09-24 18:06 ` Nick Desaulniers 2019-09-24 20:42 ` Vincenzo Frascino 2019-09-25 15:58 ` Ard Biesheuvel 2019-09-26 6:03 ` [PATCH 0/4] arm64: vdso32: Address various issues Vincenzo Frascino 2019-09-26 6:03 ` Vincenzo Frascino 2019-09-26 6:03 ` [PATCH 1/4] arm64: vdso32: Introduce COMPAT_CC_IS_GCC Vincenzo Frascino 2019-09-26 6:03 ` Vincenzo Frascino 2019-09-26 8:06 ` Catalin Marinas 2019-09-26 8:06 ` Catalin Marinas 2019-09-26 10:56 ` Vincenzo Frascino 2019-09-26 10:56 ` Vincenzo Frascino 2019-09-26 11:02 ` Vincenzo Frascino 2019-09-26 11:02 ` Vincenzo Frascino 2019-09-26 15:23 ` Catalin Marinas 2019-09-26 15:23 ` Catalin Marinas 2019-09-26 12:22 ` Vincenzo Frascino 2019-09-26 12:22 ` Vincenzo Frascino 2019-09-26 15:17 ` Catalin Marinas 2019-09-26 15:17 ` Catalin Marinas 2019-09-26 20:17 ` Vincenzo Frascino 2019-09-26 20:17 ` Vincenzo Frascino 2019-09-26 6:03 ` [PATCH 2/4] arm64: vdso32: Detect binutils support for dmb ishld Vincenzo Frascino 2019-09-26 6:03 ` Vincenzo Frascino 2019-09-26 8:30 ` Catalin Marinas 2019-09-26 8:30 ` Catalin Marinas 2019-09-26 10:59 ` Vincenzo Frascino 2019-09-26 10:59 ` Vincenzo Frascino 2019-09-26 6:03 ` [PATCH 3/4] arm64: vdso32: Fix compilation warning Vincenzo Frascino 2019-09-26 6:03 ` Vincenzo Frascino 2019-09-26 8:32 ` Catalin Marinas 2019-09-26 8:32 ` Catalin Marinas 2019-09-26 11:03 ` Vincenzo Frascino 2019-09-26 11:03 ` Vincenzo Frascino 2019-09-26 6:03 ` [PATCH 4/4] arm64: Remove gettimeofday.S Vincenzo Frascino 2019-09-26 6:03 ` Vincenzo Frascino 2019-09-26 8:34 ` Catalin Marinas 2019-09-26 8:34 ` Catalin Marinas 2019-09-26 13:38 ` [PATCH v2 0/4] arm64: vdso32: Address various issues Vincenzo Frascino 2019-09-26 13:38 ` Vincenzo Frascino 2019-09-26 13:38 ` [PATCH v2 1/4] arm64: vdso32: Introduce COMPAT_CC_IS_GCC Vincenzo Frascino 2019-09-26 13:38 ` Vincenzo Frascino 2019-09-26 15:13 ` Catalin Marinas 2019-09-26 15:13 ` Catalin Marinas 2019-09-26 13:38 ` [PATCH v2 2/4] arm64: vdso32: Detect binutils support for dmb ishld Vincenzo Frascino 2019-09-26 13:38 ` Vincenzo Frascino 2019-09-26 14:26 ` Catalin Marinas 2019-09-26 14:26 ` Catalin Marinas 2019-09-26 20:19 ` Vincenzo Frascino 2019-09-26 20:19 ` Vincenzo Frascino 2019-09-26 15:59 ` Catalin Marinas 2019-09-26 15:59 ` Catalin Marinas 2019-09-26 21:17 ` Vincenzo Frascino 2019-09-26 21:17 ` Vincenzo Frascino 2019-09-26 16:23 ` Nick Desaulniers 2019-09-26 16:23 ` Nick Desaulniers 2019-09-26 13:38 ` [PATCH v2 3/4] arm64: vdso32: Fix compilation warning Vincenzo Frascino 2019-09-26 13:38 ` Vincenzo Frascino 2019-09-26 15:22 ` Catalin Marinas 2019-09-26 15:22 ` Catalin Marinas 2019-09-26 13:38 ` [PATCH v2 4/4] arm64: Remove gettimeofday.S Vincenzo Frascino 2019-09-26 13:38 ` Vincenzo Frascino 2019-09-26 15:31 ` [PATCH v2 0/4] arm64: vdso32: Address various issues Catalin Marinas 2019-09-26 15:31 ` Catalin Marinas 2019-09-26 20:29 ` Vincenzo Frascino 2019-09-26 20:29 ` Vincenzo Frascino 2019-09-26 21:43 ` [PATCH v3 0/5]arm64: " Vincenzo Frascino 2019-09-26 21:43 ` Vincenzo Frascino 2019-09-26 21:43 ` [PATCH v3 1/5] arm64: vdso32: Introduce COMPAT_CC_IS_GCC Vincenzo Frascino 2019-09-26 21:43 ` Vincenzo Frascino 2019-09-27 9:24 ` Catalin Marinas 2019-09-27 9:24 ` Catalin Marinas 2019-10-01 13:14 ` Will Deacon 2019-10-01 13:14 ` Will Deacon 2019-10-01 13:27 ` Catalin Marinas 2019-10-01 13:27 ` Catalin Marinas 2019-10-01 14:20 ` Vincenzo Frascino 2019-10-01 14:20 ` Vincenzo Frascino 2019-10-01 14:20 ` Will Deacon 2019-10-01 14:20 ` Will Deacon 2019-10-01 14:37 ` Vincenzo Frascino 2019-10-01 14:37 ` Vincenzo Frascino 2019-10-01 14:43 ` Will Deacon 2019-10-01 14:43 ` Will Deacon 2019-10-01 14:59 ` Vincenzo Frascino 2019-10-01 14:59 ` Vincenzo Frascino 2019-10-01 15:30 ` Catalin Marinas 2019-10-01 15:30 ` Catalin Marinas 2019-10-01 16:46 ` Will Deacon 2019-10-01 16:46 ` Will Deacon 2019-10-01 16:59 ` Nick Desaulniers 2019-10-01 16:59 ` Nick Desaulniers 2019-10-01 17:07 ` Will Deacon 2019-10-01 17:07 ` Will Deacon 2019-10-01 17:12 ` Nick Desaulniers 2019-10-01 17:12 ` Nick Desaulniers 2019-10-01 17:14 ` Will Deacon 2019-10-01 17:14 ` Will Deacon 2019-09-26 21:43 ` [PATCH v3 2/5] arm64: vdso32: Detect binutils support for dmb ishld Vincenzo Frascino 2019-09-26 21:43 ` Vincenzo Frascino 2019-09-27 9:25 ` Catalin Marinas 2019-09-27 9:25 ` Catalin Marinas 2019-10-01 13:26 ` Will Deacon 2019-10-01 13:26 ` Will Deacon 2019-10-01 14:23 ` Vincenzo Frascino 2019-10-01 14:23 ` Vincenzo Frascino 2019-09-26 21:43 ` [PATCH v3 3/5] arm64: vdso32: Fix compilation warning Vincenzo Frascino 2019-09-26 21:43 ` Vincenzo Frascino 2019-09-27 9:26 ` Catalin Marinas 2019-09-27 9:26 ` Catalin Marinas 2019-10-01 13:21 ` Will Deacon 2019-10-01 13:21 ` Will Deacon 2019-10-01 14:41 ` Vincenzo Frascino [this message] 2019-10-01 14:41 ` Vincenzo Frascino 2019-09-26 21:43 ` [PATCH v3 4/5] arm64: Remove gettimeofday.S Vincenzo Frascino 2019-09-26 21:43 ` Vincenzo Frascino 2019-09-26 21:43 ` [PATCH v3 5/5] arm64: vdso32: Remove jump label config option in Makefile Vincenzo Frascino 2019-09-26 21:43 ` Vincenzo Frascino 2019-09-27 9:27 ` Catalin Marinas 2019-09-27 9:27 ` Catalin Marinas 2019-09-27 10:46 ` [PATCH v3 0/5]arm64: vdso32: Address various issues Catalin Marinas 2019-09-27 10:46 ` Catalin Marinas 2019-10-01 13:27 ` Will Deacon 2019-10-01 13:27 ` Will Deacon
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