From: Mark Rutland <mark.rutland@arm.com> To: Dominik Brodowski <linux@dominikbrodowski.net> Cc: Dave Martin <Dave.Martin@arm.com>, linux-arm-kernel@lists.infradead.org, marc.zyngier@arm.com, catalin.marinas@arm.com, will.deacon@arm.com, linux-kernel@vger.kernel.org, james.morse@arm.com, viro@zeniv.linux.org.uk, linux-fsdevel@vger.kernel.org Subject: Re: [PATCH 08/18] arm64: convert raw syscall invocation to C Date: Tue, 15 May 2018 09:22:23 +0100 [thread overview] Message-ID: <20180515082222.rcoyf6dsf2s2edgq@salmiak> (raw) In-Reply-To: <20180514202445.GA26773@light.dominikbrodowski.net> On Mon, May 14, 2018 at 10:24:45PM +0200, Dominik Brodowski wrote: > On Mon, May 14, 2018 at 12:41:10PM +0100, Mark Rutland wrote: > > I agree it would be nicer if it had a wrapper that took a pt_regs, even > > if it does nothing with it. > > > > We can't use SYSCALL_DEFINE0() due to the fault injection muck, we'd > > need a ksys_ni_syscall() for our traps.c logic, and adding this > > uniformly would involve some arch-specific rework for x86, too, so I > > decided it was not worth the effort. > > Couldn't you just open-code the "return -ENOSYS;" in traps.c? I guess so. I was just worried that debug logic might be added to the generic ni_syscall() in future, and wanted to avoid potential divergence. > Error injection has no reasonable stable ABI/API expectations, so that's not > a show-stopper either. If people are happy with using SYSCALL_DEFINE0() for ni_syscall, I'm happy to do that -- it's just that we'll need a fixup for x86 as that will change the symbol name. Thanks, Mark.
WARNING: multiple messages have this Message-ID (diff)
From: mark.rutland@arm.com (Mark Rutland) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 08/18] arm64: convert raw syscall invocation to C Date: Tue, 15 May 2018 09:22:23 +0100 [thread overview] Message-ID: <20180515082222.rcoyf6dsf2s2edgq@salmiak> (raw) In-Reply-To: <20180514202445.GA26773@light.dominikbrodowski.net> On Mon, May 14, 2018 at 10:24:45PM +0200, Dominik Brodowski wrote: > On Mon, May 14, 2018 at 12:41:10PM +0100, Mark Rutland wrote: > > I agree it would be nicer if it had a wrapper that took a pt_regs, even > > if it does nothing with it. > > > > We can't use SYSCALL_DEFINE0() due to the fault injection muck, we'd > > need a ksys_ni_syscall() for our traps.c logic, and adding this > > uniformly would involve some arch-specific rework for x86, too, so I > > decided it was not worth the effort. > > Couldn't you just open-code the "return -ENOSYS;" in traps.c? I guess so. I was just worried that debug logic might be added to the generic ni_syscall() in future, and wanted to avoid potential divergence. > Error injection has no reasonable stable ABI/API expectations, so that's not > a show-stopper either. If people are happy with using SYSCALL_DEFINE0() for ni_syscall, I'm happy to do that -- it's just that we'll need a fixup for x86 as that will change the symbol name. Thanks, Mark.
next prev parent reply other threads:[~2018-05-15 8:22 UTC|newest] Thread overview: 126+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-05-14 9:46 [PATCH 00/18] arm64: invoke syscalls with pt_regs Mark Rutland 2018-05-14 9:46 ` Mark Rutland 2018-05-14 9:46 ` [PATCH 01/18] arm64: consistently use unsigned long for thread flags Mark Rutland 2018-05-14 9:46 ` Mark Rutland 2018-05-14 9:57 ` Dave Martin 2018-05-14 9:57 ` Dave Martin 2018-05-14 9:46 ` [PATCH 02/18] arm64: move SCTLR_EL{1,2} assertions to <asm/sysreg.h> Mark Rutland 2018-05-14 9:46 ` Mark Rutland 2018-05-14 10:00 ` Dave Martin 2018-05-14 10:00 ` Dave Martin 2018-05-14 10:08 ` Mark Rutland 2018-05-14 10:08 ` Mark Rutland 2018-05-14 11:20 ` Dave Martin 2018-05-14 11:20 ` Dave Martin 2018-05-14 11:56 ` Robin Murphy 2018-05-14 11:56 ` Robin Murphy 2018-05-14 12:06 ` Mark Rutland 2018-05-14 12:06 ` Mark Rutland 2018-05-14 12:41 ` Dave Martin 2018-05-14 12:41 ` Dave Martin 2018-05-14 13:10 ` Mark Rutland 2018-05-14 13:10 ` Mark Rutland 2018-05-14 9:46 ` [PATCH 03/18] arm64: introduce sysreg_clear_set() Mark Rutland 2018-05-14 9:46 ` Mark Rutland 2018-05-14 10:04 ` Dave Martin 2018-05-14 10:04 ` Dave Martin 2018-05-14 9:46 ` [PATCH 04/18] arm64: kill config_sctlr_el1() Mark Rutland 2018-05-14 9:46 ` Mark Rutland 2018-05-14 10:05 ` Dave Martin 2018-05-14 10:05 ` Dave Martin 2018-05-14 9:46 ` [PATCH 05/18] arm64: kill change_cpacr() Mark Rutland 2018-05-14 9:46 ` Mark Rutland 2018-05-14 10:06 ` Dave Martin 2018-05-14 10:06 ` Dave Martin 2018-05-14 9:46 ` [PATCH 06/18] arm64: move sve_user_{enable,disable} to <asm/fpsimd.h> Mark Rutland 2018-05-14 9:46 ` [PATCH 06/18] arm64: move sve_user_{enable, disable} " Mark Rutland 2018-05-14 11:06 ` Dave Martin 2018-05-14 11:06 ` Dave Martin 2018-05-15 10:39 ` Mark Rutland 2018-05-15 10:39 ` Mark Rutland 2018-05-15 12:19 ` Dave Martin 2018-05-15 12:19 ` Dave Martin 2018-05-15 16:33 ` Mark Rutland 2018-05-15 16:33 ` Mark Rutland 2018-05-16 9:01 ` Dave Martin 2018-05-16 9:01 ` Dave Martin 2018-06-01 10:29 ` Mark Rutland 2018-06-01 10:29 ` Mark Rutland 2018-06-01 10:42 ` Dave Martin 2018-06-01 10:42 ` Dave Martin 2018-05-14 9:46 ` [PATCH 07/18] arm64: remove sigreturn wrappers Mark Rutland 2018-05-14 9:46 ` Mark Rutland 2018-05-14 11:07 ` Dave Martin 2018-05-14 11:07 ` Dave Martin 2018-05-14 9:46 ` [PATCH 08/18] arm64: convert raw syscall invocation to C Mark Rutland 2018-05-14 9:46 ` Mark Rutland 2018-05-14 11:07 ` Dave Martin 2018-05-14 11:07 ` Dave Martin 2018-05-14 11:41 ` Mark Rutland 2018-05-14 11:41 ` Mark Rutland 2018-05-14 12:53 ` Dave Martin 2018-05-14 12:53 ` Dave Martin 2018-05-14 20:24 ` Dominik Brodowski 2018-05-14 20:24 ` Dominik Brodowski 2018-05-15 8:22 ` Mark Rutland [this message] 2018-05-15 8:22 ` Mark Rutland 2018-05-15 10:01 ` Dominik Brodowski 2018-05-15 10:01 ` Dominik Brodowski 2018-05-15 10:13 ` Mark Rutland 2018-05-15 10:13 ` Mark Rutland 2018-05-14 18:00 ` Dominik Brodowski 2018-05-14 18:00 ` Dominik Brodowski 2018-05-15 8:18 ` Mark Rutland 2018-05-15 8:18 ` Mark Rutland 2018-05-14 9:46 ` [PATCH 09/18] arm64: convert syscall trace logic " Mark Rutland 2018-05-14 9:46 ` Mark Rutland 2018-05-14 9:46 ` [PATCH 10/18] arm64: convert native/compat syscall entry " Mark Rutland 2018-05-14 9:46 ` Mark Rutland 2018-05-14 11:07 ` Dave Martin 2018-05-14 11:07 ` Dave Martin 2018-05-14 11:58 ` Mark Rutland 2018-05-14 11:58 ` Mark Rutland 2018-05-14 14:43 ` Dave Martin 2018-05-14 14:43 ` Dave Martin 2018-05-14 15:01 ` Mark Rutland 2018-05-14 15:01 ` Mark Rutland 2018-05-14 9:46 ` [PATCH 11/18] arm64: zero GPRs upon entry from EL0 Mark Rutland 2018-05-14 9:46 ` Mark Rutland 2018-05-14 11:07 ` Dave Martin 2018-05-14 11:07 ` Dave Martin 2018-05-14 9:46 ` [PATCH 12/18] kernel: add ksys_personality() Mark Rutland 2018-05-14 9:46 ` Mark Rutland 2018-05-14 11:08 ` Dave Martin 2018-05-14 11:08 ` Dave Martin 2018-05-14 12:07 ` Christoph Hellwig 2018-05-14 12:07 ` Christoph Hellwig 2018-05-15 9:56 ` Mark Rutland 2018-05-15 9:56 ` Mark Rutland 2018-05-14 9:46 ` [PATCH 13/18] kernel: add kcompat_sys_{f,}statfs64() Mark Rutland 2018-05-14 9:46 ` Mark Rutland 2018-05-14 17:14 ` Mark Rutland 2018-05-14 17:14 ` Mark Rutland 2018-05-14 20:34 ` Dominik Brodowski 2018-05-14 20:34 ` Dominik Brodowski 2018-05-15 9:53 ` Mark Rutland 2018-05-15 9:53 ` Mark Rutland 2018-05-15 9:58 ` Dominik Brodowski 2018-05-15 9:58 ` Dominik Brodowski 2018-05-14 9:46 ` [PATCH 14/18] arm64: remove in-kernel call to sys_personality() Mark Rutland 2018-05-14 9:46 ` Mark Rutland 2018-05-14 9:46 ` [PATCH 15/18] arm64: use {COMPAT,}SYSCALL_DEFINE0 for sigreturn Mark Rutland 2018-05-14 9:46 ` Mark Rutland 2018-05-14 9:46 ` [PATCH 16/18] arm64: use SYSCALL_DEFINE6() for mmap Mark Rutland 2018-05-14 9:46 ` Mark Rutland 2018-05-14 9:46 ` [PATCH 17/18] arm64: convert compat wrappers to C Mark Rutland 2018-05-14 9:46 ` Mark Rutland 2018-05-14 12:10 ` Christoph Hellwig 2018-05-14 12:10 ` Christoph Hellwig 2018-05-14 12:43 ` Mark Rutland 2018-05-14 12:43 ` Mark Rutland 2018-05-14 9:46 ` [PATCH 18/18] arm64: implement syscall wrappers Mark Rutland 2018-05-14 9:46 ` Mark Rutland 2018-05-14 20:57 ` Dominik Brodowski 2018-05-14 20:57 ` Dominik Brodowski 2018-05-15 8:37 ` Mark Rutland 2018-05-15 8:37 ` Mark Rutland
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